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Zenair601HDS Stratus/Ram cooling problem

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ronhansen123(at)gmail.com
Guest

Posted: Mon Jun 27, 2011 2:55 pm Post subject: Zenair601HDS Stratus/Ram cooling problem

Hi listers,



I've been quiet a long time due to life interfering with my plans, but I need some help.  I had about 60 hours on my 601HDS with a Stratus on it.  I was fighting temp. issues from the start, adjusting the carb jets and such.  I had Ram modify the heads before it flew.  Anyway, I never went past the Stratus 230 deg. "water temp" redline, but often approached it.  Taxiing in after 60 flight hours I broke a valve seat and later learned broke a piston.  I have not been pleased with Stratus support for years so I had Ram Performance rebuild the engine.  He also made some other changes and it now runs stronger and cooler, but still not cool enough.  I moved the "water temp" probe from the Stratus setup in the cylinder head dry-hole to actual water as it comes out of the engine.  Ram says water temp redline should be 220 deg. and the engine should run at the thermostat setting of 190 deg.  Research I've done would indicate the same for long engine life.

 

Anyway, I still get water temp climbing to 220 a few minutes after takeoff on a warm day and I suspect it would go higher.  My radiator is the stock Zenair radiator installed per plans.  Gaps are sealed.  Coolant is 50/50 per instructions.  I'm beginning to think the Zenith setup is not suitable for a 100HP engine that is water cooled.  The Rotax they designed it for only uses water to cool the heads.

 

I don't want to ruin my new Ram-rebuilt engine.  It is running really well: stronger, cooler, lower fuel burn......but it's not running at the temps it should do to a weak cooling system.  If anyone has data or ideas that would help I would appreciate hearing from you.  I recall all sorts of discussion from years past (this plane took me many years to build from plans), but I can't remember where all those ideas ended up.  I know some were abandoned, but others probably solved some or all of the problem.  I've gone through the archives, but you never know if you're missing something important that came later.

 

Thanks,



Ron Hansen

Los Angeles

601HDS, Ram-Rebuilt (formerly Stratus) Subaru EA81

  [quote][b]

gkrysztopik(at)satx.rr.co
Guest

Posted: Mon Jun 27, 2011 5:31 pm Post subject: Zenair601HDS Stratus/Ram cooling problem

My system has been pretty good since Al sold me his old radiator - 3" thick, 16" wide core (21" total with a small tank on each side) and about 5" tall.  I reworked the exhaust to move the muffler out of the cowling and under the belly, and air flows over the oil pan as well as through the radiator.



In TX, it stays around 95 - 100 degrees F in the summer and I can't sustain full-power climbs without banging against the redlines so I step climb.  I'm reworking things again and I'm hoping it will be much better.  I had the radiator and oil pan sharing the same inlet duct and I will be separating them, and trying an exhaust-augmented outlet duct.  I hope to be done within a few weeks of fiddling and will post results and pictures.



Gary Krysztopik

Pelican w/Stratus EA-81

San Antonio, TX

 

---- ron hansen <ronhansen123(at)gmail.com> wrote: 

 	  Quote: 	
		   Hi listers,

 

 I've been quiet a long time due to life interfering with my plans, but I

 need some help.  I had about 60 hours on my 601HDS with a Stratus on it.  I

 was fighting temp. issues from the start, adjusting the carb jets and such.

 I had Ram modify the heads before it flew.  Anyway, I never went past the

 Stratus 230 deg. "water temp" redline, but often approached it.  Taxiing in

 after 60 flight hours I broke a valve seat and later learned broke a

 piston.  I have not been pleased with Stratus support for years so I had Ram

 Performance rebuild the engine.  He also made some other changes and it now

 runs stronger and cooler, but still not cool enough.  I moved the "water

 temp" probe from the Stratus setup in the cylinder head dry-hole to actual

 water as it comes out of the engine.  Ram says water temp redline should be

 220 deg. and the engine should run at the thermostat setting of 190 deg.

 Research I've done would indicate the same for long engine life.

 

 Anyway, I still get water temp climbing to 220 a few minutes after takeoff

 on a warm day and I suspect it would go higher.  My radiator is the stock

 Zenair radiator installed per plans.  Gaps are sealed.  Coolant is 50/50 per

 instructions.  I'm beginning to think the Zenith setup is not suitable for a

 100HP engine that is water cooled.  The Rotax they designed it for only uses

 water to cool the heads.

 

 I don't want to ruin my new Ram-rebuilt engine.  It is running really well:

 stronger, cooler, lower fuel burn......but it's not running at the temps it

 should do to a weak cooling system.  If anyone has data or ideas that would

 help I would appreciate hearing from you.  I recall all sorts of discussion

 from years past (this plane took me many years to build from plans), but I

 can't remember where all those ideas ended up.  I know some were abandoned,

 but others probably solved some or all of the problem.  I've gone through

 the archives, but you never know if you're missing something important that

 came later.

 

 Thanks,

 

 Ron Hansen

 Los Angeles

 601HDS, Ram-Rebuilt (formerly Stratus) Subaru EA81

gkrysztopik(at)satx.rr.co
Guest

Posted: Tue Jun 28, 2011 5:15 am Post subject: Zenair601HDS Stratus/Ram cooling problem

Good point Larry.  I found that a higher pitch setting ran cooler than a fine pitch.  Counter-intuitive to me.  12 degrees ran hot, 16 degrees was noticeably cooler.



Gary

---- Larry McFarland <larry(at)macsmachine.com> wrote: 

 	  Quote: 	
		   HI Ron,

 

 The cooling issue is very common, but coolant temps should never see more

 than 200 on a hot day in a perpetual climb.  My cowl opening just ahead of

 the oil pan for some reason cools better in a climb than going fast flat and

 level.   As you've done the jetting, you might consider the propeller pitch.

 My Warp Drive 70-inch 3 blade set for 17-1/2 degrees per their instrument

 does a much better job of cooling flat out at or near

 

 120 mph.  The pitch allows lower rpms, better speed.  I trim nose down

 carefully to get best speed by setting rpms to 4300 for best fuel burn until

 the rate of climb gage indicates level flight.  You feel the center of lift

 move slightly back on the wing and get optimum cooling this way too.  Odd, I

 flew for a year or more before realizing that trimming in the last bit of

 down elevator at a cruise rpm would increase performance and cooling so

 much.  Used to also worry that the nose was always slightly up before

 discovering this.

 

 I seldom fly flat out as there's no way to justify the fuel burn and engine

 wear at 5000 rpm.

 

 Note the links show the hole in front of the oil pan and heat from the

 exhaust pipes is fed cool air either side of the cowl looking straight in

 

 at aluminum sleeve clearance aluminum.  They made a significant difference.

 

 

 http://www.macsmachine.com/images/completion/full/601ezclosefrtrt.gif

 

 http://www.macsmachine.com/images/cowling/full/cowelfrtlower.gif

 

 Hope this helps,

 

 Fly safe

 

  

 

 Larry McFarland  601HDS at www.macsmachine.com

 

  

 

  

 

  

 

 From: owner-stratus-list-server(at)matronics.com

 [mailto:owner-stratus-list-server(at)matronics.com] On Behalf Of ron hansen

 Sent: Monday, June 27, 2011 5:53 PM

 To: stratus-list(at)matronics.com

 Subject: [Probable Spam] Zenair601HDS Stratus/Ram cooling

 problem

 

  

 

 Hi listers,

 

 I've been quiet a long time due to life interfering with my plans, but I

 need some help.  I had about 60 hours on my 601HDS with a Stratus on it.  I

 was fighting temp. issues from the start, adjusting the carb jets and such.

 I had Ram modify the heads before it flew.  Anyway, I never went past the

 Stratus 230 deg. "water temp" redline, but often approached it.  Taxiing in

 after 60 flight hours I broke a valve seat and later learned broke a piston.

 I have not been pleased with Stratus support for years so I had Ram

 Performance rebuild the engine.  He also made some other changes and it now

 runs stronger and cooler, but still not cool enough.  I moved the "water

 temp" probe from the Stratus setup in the cylinder head dry-hole to actual

 water as it comes out of the engine.  Ram says water temp redline should be

 220 deg. and the engine should run at the thermostat setting of 190 deg.

 Research I've done would indicate the same for long engine life.

 

 Anyway, I still get water temp climbing to 220 a few minutes after takeoff

 on a warm day and I suspect it would go higher.  My radiator is the stock

 Zenair radiator installed per plans.  Gaps are sealed.  Coolant is 50/50 per

 instructions.  I'm beginning to think the Zenith setup is not suitable for a

 100HP engine that is water cooled.  The Rotax they designed it for only uses

 water to cool the heads.

 

 I don't want to ruin my new Ram-rebuilt engine.  It is running really well:

 stronger, cooler, lower fuel burn......but it's not running at the temps it

 should do to a weak cooling system.  If anyone has data or ideas that would

 help I would appreciate hearing from you.  I recall all sorts of discussion

 from years past (this plane took me many years to build from plans), but I

 can't remember where all those ideas ended up.  I know some were abandoned,

 but others probably solved some or all of the problem.  I've gone through

 the archives, but you never know if you're missing something important that

 came later.

 

 Thanks,

 

 Ron Hansen

 Los Angeles

 601HDS, Ram-Rebuilt (formerly Stratus) Subaru EA81

tshankland(at)sbcglobal.n
Guest

Posted: Tue Jun 28, 2011 1:43 pm Post subject: Zenair601HDS Stratus/Ram cooling problem

Ron,

 I fly A 601HD with a status Suburu. My engine  temperature runs at 190 with an occasional 200 on long hot climbouts. I  think that a lot of the problems builders have had with this engine is due to  high temperatures. I spent 1 year designing my cooling system and gave a couple  of seminars at OSH about cooling systems design. I don't know if that stock  design can ever give really good results.My system looks somewhat "radical" and  is not easily adapted to a finished aircraft. The problem is that the stock  system has no ducting of pressure recover, plus the fact that exhaust and engine  heat go into the radiator. Various idea expressed in this forum can help, but  the root cause is an inadequate design

  

 Tim Shankland

 [quote]   ---

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ronhansen123(at)gmail.com
Guest

Posted: Tue Jun 28, 2011 4:13 pm Post subject: Zenair601HDS Stratus/Ram cooling problem

Can the plastic nubs that stick up from the Zenith 601 radiator (VW Rabbit part if I recall) be cut off without making a hole in the radiator or weakening it?  These are the aprox. 1/2" dia. by 1/2" tall cylindrical posts with a hole in the center, two on the top, two on the bottom of both ends of the radiator.  They probably don't disturb the air into the radiator a lot, but I'd sure like to saw them off.

   

 Thanks,

  

 Ron

 On Mon, Jun 27, 2011 at 3:53 PM, ron hansen <ronhansen123(at)gmail.com (ronhansen123(at)gmail.com)> wrote:

 [quote]Hi listers,



I've been quiet a long time due to life interfering with my plans, but I need some help.  I had about 60 hours on my 601HDS with a Stratus on it.  I was fighting temp. issues from the start, adjusting the carb jets and such.  I had Ram modify the heads before it flew.  Anyway, I never went past the Stratus 230 deg. "water temp" redline, but often approached it.  Taxiing in after 60 flight hours I broke a valve seat and later learned broke a piston.  I have not been pleased with Stratus support for years so I had Ram Performance rebuild the engine.  He also made some other changes and it now runs stronger and cooler, but still not cool enough.  I moved the "water temp" probe from the Stratus setup in the cylinder head dry-hole to actual water as it comes out of the engine.  Ram says water temp redline should be 220 deg. and the engine should run at the thermostat setting of 190 deg.  Research I've done would indicate the same for long engine life.

 

Anyway, I still get water temp climbing to 220 a few minutes after takeoff on a warm day and I suspect it would go higher.  My radiator is the stock Zenair radiator installed per plans.  Gaps are sealed.  Coolant is 50/50 per instructions.  I'm beginning to think the Zenith setup is not suitable for a 100HP engine that is water cooled.  The Rotax they designed it for only uses water to cool the heads.

 

I don't want to ruin my new Ram-rebuilt engine.  It is running really well: stronger, cooler, lower fuel burn......but it's not running at the temps it should do to a weak cooling system.  If anyone has data or ideas that would help I would appreciate hearing from you.  I recall all sorts of discussion from years past (this plane took me many years to build from plans), but I can't remember where all those ideas ended up.  I know some were abandoned, but others probably solved some or all of the problem.  I've gone through the archives, but you never know if you're missing something important that came later.

 

Thanks,



Ron Hansen

Los Angeles

601HDS, Ram-Rebuilt (formerly Stratus) Subaru EA81

[b]

andynfultz(at)bellsouth.n
Guest

Posted: Tue Jun 28, 2011 6:19 pm Post subject: Zenair601HDS Stratus/Ram cooling problem

Ron,

  

    I feel your pain and would be interested in any responses you get.  I've  been flying my STRATUS powered AVID for two weeks today and I am having the same  cooling problems you are having.  What size is your  radiator?

  

 Andy  F.

 [quote]   --

ronhansen123(at)gmail.com
Guest

Posted: Tue Jun 28, 2011 7:26 pm Post subject: Zenair601HDS Stratus/Ram cooling problem

My radiator core is aprx. 12" wide x 19" long x 1.5" thick.  It's a single layer radiator.  I'm looking at the Zenair installation design and referencing a book called "Cooling Your Wankel" that I just bought from Aircraft Spruce.  Most of it applies to any water-cooled aircraft engine installation, though some is Wankel specific.  I think I can improve efficiency by adhering to some design concepts in the book better than Zenair did.  I'll be doing some mods and testing this weekend if the weather's good and will post results.

   

 Ron

 On Tue, Jun 28, 2011 at 7:17 PM, Andy Fultz <andynfultz(at)bellsouth.net (andynfultz(at)bellsouth.net)> wrote:

 [quote]  Ron,

  

   I feel your pain and would be interested in any responses you get.  I've been flying my STRATUS powered AVID for two weeks today and I am having the same cooling problems you are having.  What size is your radiator?

   

 Andy F.

 [quote] --

Ronbo135(at)aol.com
Guest

Posted: Wed Jun 29, 2011 10:42 am Post subject: Zenair601HDS Stratus/Ram cooling problem

In a message dated 6/28/2011 2:43:27 P.M. Pacific Daylight Time,  tshankland(at)sbcglobal.net writes:

 [quote]   Ron,

   I fly A 601HD with a status Suburu. My engine    temperature runs at 190 with an occasional 200 on long hot climbouts. I    think that a lot of the problems builders have had with this engine is due to    high temperatures. I spent 1 year designing my cooling system and gave a    couple of seminars at OSH about cooling systems design. I don't know if that    stock design can ever give really good results.My system looks somewhat    "radical" and is not easily adapted to a finished aircraft. The problem is    that the stock system has no ducting of pressure recover, plus the fact that    exhaust and engine heat go into the radiator. Various idea expressed in this    forum can help, but the root cause is an inadequate design

    

   Tim Shankland

   [quote]     ---

Ronbo135(at)aol.com
Guest

Posted: Wed Jun 29, 2011 10:43 am Post subject: Zenair601HDS Stratus/Ram cooling problem

Thanks, Tim.

  

 Your conclusion that the design is inadequate is in line with what I'm  learning and hearing.

  

  In a message dated 6/28/2011 2:43:27 P.M. Pacific Daylight Time,  tshankland(at)sbcglobal.net writes:

 [quote]   Ron,

   I fly A 601HD with a status Suburu. My engine    temperature runs at 190 with an occasional 200 on long hot climbouts. I    think that a lot of the problems builders have had with this engine is due to    high temperatures. I spent 1 year designing my cooling system and gave a    couple of seminars at OSH about cooling systems design. I don't know if that    stock design can ever give really good results.My system looks somewhat    "radical" and is not easily adapted to a finished aircraft. The problem is    that the stock system has no ducting of pressure recover, plus the fact that    exhaust and engine heat go into the radiator. Various idea expressed in this    forum can help, but the root cause is an inadequate design

    

   Tim Shankland

   [quote]     ---

frank.hinde(at)hp.com
Guest

Posted: Wed Jun 29, 2011 10:57 am Post subject: Zenair601HDS Stratus/Ram cooling problem

I think its more like no design at all. I hear all the time about how a water cooled system CAN be better than air cooled. I mean look at the Mustang! 

  

The fact of the matter is, its really never been done.  

  

If its any consolation the faster the airplane the harder it appears to make it work. RV’s running water cooled motors almost always run 20 to 25 knots slower  than their air-cooled  counterparts for the same fuel burn. 

  

As for me my RV7a has an IO360 (Lycoming) but I did build a variation of my Zodiac wing root electric fuel pump system..I.e junked the mechanical fuel pump…Just  to upset the “proper airplane engine” establishment.. 

   

Frank  

601HDS..Stratus with ram heads 

RV7a Io360 

  

Cell/Mobile +1 541 602 8756 

Tel +1 541 715 7568 

 

    

From: owner-stratus-list-server(at)matronics.com [mailto:owner-stratus-list-server(at)matronics.com] On Behalf Of Ronbo135(at)aol.com

 Sent: Wednesday, June 29, 2011 11:42 AM

 To: stratus-list(at)matronics.com

 Subject: Re: Zenair601HDS Stratus/Ram cooling problem 

 

 

   

Thanks, Tim. 

  

  

  

Your conclusion that the design is inadequate is in line with what I'm learning and hearing. 

  

  

 

    [quote][b]

bryanmmartin

Joined: 10 Jan 2006
Posts: 1018

Posted: Wed Jun 29, 2011 11:35 am Post subject: Zenair601HDS Stratus/Ram cooling problem

The Mustang and the Spitfire were designed around water-cooled engines. Their cooling systems were designed right into the airframe from the start. Both planes had much lower cooling drag than other aircraft of the time with similar horsepower. The best water cooling systems for aircraft have the radiators buried either in the fuselage or wing roots with carefully designed ducts directing airflow over them. The Mustang cooling system produced almost enough thrust to overcome the cooling drag entirely. It's going to be very difficult to match that when you have to fit a water cooling system on an airframe that wasn't really designed for it. 



To help the radiator cool the engine, one trick is to block the heated air from the cowl from flowing into the radiator so it can get cooler ambient air flow. I have a scoop on my radiator that extends ahead of the outlets from the cowl. I never see a problem with high water temps although I do see high oil temps on long climb-outs on hot days.

On Jun 29, 2011, at 2:54 PM, Hinde, Frank George (Corvallis) wrote:



 	  Quote: 	
		   I think its more like no design at all. I hear all the time about how a water cooled system CAN be better than air cooled. I mean look at the Mustang!

  

 The fact of the matter is, its really never been done.

  

 If its any consolation the faster the airplane the harder it appears to make it work. RV’s running water cooled motors almost always run 20 to 25 knots slower than their air-cooled  counterparts for the same fuel burn.

  

 As for me my RV7a has an IO360 (Lycoming) but I did build a variation of my Zodiac wing root electric fuel pump system..I.e junked the mechanical fuel pump…Just to upset the “proper airplane engine” establishment..

  


	


-- 

Bryan Martin

N61BM, CH 601 XL,

RAM Subaru, Stratus re-drive.

do not archive.

_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.

ronhansen123(at)gmail.com
Guest

Posted: Fri Jul 01, 2011 8:59 am Post subject: Zenair601HDS Stratus/Ram cooling problem

I was hoping to saw those things off this weekend.  If anyone has relevant info I would appreciate it.

  

 Thanks and have a great holiday weekend,

  

 Ron

 On Tue, Jun 28, 2011 at 5:11 PM, ron hansen <ronhansen123(at)gmail.com (ronhansen123(at)gmail.com)> wrote:

 [quote] Can the plastic nubs that stick up from the Zenith 601 radiator (VW Rabbit part if I recall) be cut off without making a hole in the radiator or weakening it?  These are the aprox. 1/2" dia. by 1/2" tall cylindrical posts with a hole in the center, two on the top, two on the bottom of both ends of the radiator.  They probably don't disturb the air into the radiator a lot, but I'd sure like to saw them off.

   

 Thanks,

  

 Ron

 On Mon, Jun 27, 2011 at 3:53 PM, ron hansen <ronhansen123(at)gmail.com (ronhansen123(at)gmail.com)> wrote:

  	  Quote: 	
		  Hi listers,



I've been quiet a long time due to life interfering with my plans, but I need some help.  I had about 60 hours on my 601HDS with a Stratus on it.  I was fighting temp. issues from the start, adjusting the carb jets and such.  I had Ram modify the heads before it flew.  Anyway, I never went past the Stratus 230 deg. "water temp" redline, but often approached it.  Taxiing in after 60 flight hours I broke a valve seat and later learned broke a piston.  I have not been pleased with Stratus support for years so I had Ram Performance rebuild the engine.  He also made some other changes and it now runs stronger and cooler, but still not cool enough.  I moved the "water temp" probe from the Stratus setup in the cylinder head dry-hole to actual water as it comes out of the engine.  Ram says water temp redline should be 220 deg. and the engine should run at the thermostat setting of 190 deg.  Research I've done would indicate the same for long engine life.

 

Anyway, I still get water temp climbing to 220 a few minutes after takeoff on a warm day and I suspect it would go higher.  My radiator is the stock Zenair radiator installed per plans.  Gaps are sealed.  Coolant is 50/50 per instructions.  I'm beginning to think the Zenith setup is not suitable for a 100HP engine that is water cooled.  The Rotax they designed it for only uses water to cool the heads.

 

I don't want to ruin my new Ram-rebuilt engine.  It is running really well: stronger, cooler, lower fuel burn......but it's not running at the temps it should do to a weak cooling system.  If anyone has data or ideas that would help I would appreciate hearing from you.  I recall all sorts of discussion from years past (this plane took me many years to build from plans), but I can't remember where all those ideas ended up.  I know some were abandoned, but others probably solved some or all of the problem.  I've gone through the archives, but you never know if you're missing something important that came later.

 

Thanks,



Ron Hansen

Los Angeles

601HDS, Ram-Rebuilt (formerly Stratus) Subaru EA81





target="_blank">http://www.matronics.com/Navigator?Stratus-List

ttp://forums.matronics.com

_blank">http://www.matronics.com/contribution



	
[b]

jpkarnes

Joined: 03 Jul 2011
Posts: 19

Posted: Mon Jul 04, 2011 8:12 am Post subject: Re: Zenair601HDS Stratus/Ram cooling problem

I had cooling issues as well but were due primarily to having the muffler in front of the radiator.  I installed Supertrapp mufflers on either side of the engine and my cooling issues were resolved.

larry(at)macsmachine.com
Guest

Posted: Mon Jul 04, 2011 9:54 am Post subject: Zenair601HDS Stratus/Ram cooling problem

I have to agree bout that.  I put a wrapper heat muff around my Stratus

Subaru muffler to selectively extract and dump heat overboard in the summer

or use the heat in the winter.  This is a major component for cooling my

Stratus Subaru.  The muffler sets crosswise behind the engine. The wrapper

has a Scat tube to bring in cool air from the front cowl and one that

exhausts the heat on the opposite side. It really works well. 



Larry McFarland  601HDS at www.macsmachine.com

--

ronhansen123(at)gmail.com
Guest

Posted: Mon Jul 04, 2011 2:07 pm Post subject: Zenair601HDS Stratus/Ram cooling problem

I like the simplicity of that vs. re-designing and re-building a radiator installation.  I'm not familiar with the Supertrapp mufflers.  What style or part number did you use?  Thanks for the help.

  

 Ron

 On Mon, Jul 4, 2011 at 9:12 AM, jpkarnes <jpkarnes(at)comcast.net (jpkarnes(at)comcast.net)> wrote:

 [quote]--> Stratus-List message posted by: "jpkarnes" <jpkarnes(at)comcast.net (jpkarnes(at)comcast.net)>

 

I had cooling issues as well but were due primarily to having the muffler in front of the radiator.  I installed Supertrapp mufflers on either side of the engine and my cooling issues were resolved.





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jpkarnes

Joined: 03 Jul 2011
Posts: 19

Posted: Tue Jul 05, 2011 5:22 pm Post subject: Re: Zenair601HDS Stratus/Ram cooling problem

SuperTrapp Universal 17" S/C Elite Muffler - 2" i.d. Inlet/Chrome



I'm pretty sure this is the muffler I used.  They have worked great and leave airflow completely unimpeded.  I used two - one on each side.

gkrysztopik(at)satx.rr.co
Guest

Posted: Tue Jul 05, 2011 7:31 pm Post subject: Zenair601HDS Stratus/Ram cooling problem

I use a Burns stainless steel muffler and it has worked well too.



On 7/5/2011 8:22 PM, jpkarnes wrote:

 	  Quote: 	
		   



 SuperTrapp Universal 17" S/C Elite Muffler - 2" i.d. Inlet/Chrome



 I'm pretty sure this is the muffler I used.  They have worked great and leave airflow completely unimpeded.  I used two - one on each side.





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=345049#345049

ronhansen123(at)gmail.com
Guest

Posted: Wed Jul 06, 2011 10:52 am Post subject: Zenair601HDS Stratus/Ram cooling problem

Thanks for the info.

  

 Ron

 On Tue, Jul 5, 2011 at 6:22 PM, jpkarnes <jpkarnes(at)comcast.net (jpkarnes(at)comcast.net)> wrote:

 [quote]--> Stratus-List message posted by: "jpkarnes" <jpkarnes(at)comcast.net (jpkarnes(at)comcast.net)>

 

SuperTrapp Universal 17" S/C Elite Muffler - 2" i.d. Inlet/Chrome



I'm pretty sure this is the muffler I used.  They have worked great and leave airflow completely unimpeded.  I used two - one on each side.

 



Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=345049#345049



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