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Airbox for 912S

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stevenwpitt(at)me.com
Guest

Posted: Thu Sep 03, 2020 5:42 am Post subject: Airbox for 912S

I have had to repair my airbox as it split under the clamp.

Can anyone tell me how critical the airflow into the carburettors via the box is? Do I need to ensure a smooth and equal airflow?



I suspect not as the quality of the airbox is somewhat rudimentary.



For information I made up some â€˜bid' tube and epoxied it into the existing airflow tube. I have tried to make the entrance a smooth as possible.



Thank you.

Steve Pitt

G-SMDH

Rocketman

Joined: 07 Sep 2010
Posts: 87
Location: USA, Earth

Posted: Thu Sep 03, 2020 6:31 am Post subject: Airbox for 912S

Steve, you should be fine as long as the internal diameter of the tube 

is equal to or greater than the internal diameter of the carb opening.



Jeff



"I believe that forgiving them is God's function. Our job is to arrange 

the meeting."



-Gen. Norman Schwarzkopf



On 9/3/2020 8:40 AM, Steven Pitt wrote:

 	  Quote: 	
		   

 

 I have had to repair my airbox as it split under the clamp.

 Can anyone tell me how critical the airflow into the carburettors via the box is? Do I need to ensure a smooth and equal airflow?

 

 I suspect not as the quality of the airbox is somewhat rudimentary.

 

 For information I made up some â€˜bid' tube and epoxied it into the existing airflow tube. I have tried to make the entrance a smooth as possible.

 

 Thank you.

 Steve Pitt

 G-SMDH

dpark748(at)me.com
Guest

Posted: Thu Sep 03, 2020 6:47 am Post subject: Airbox for 912S

When I had a airbox on initial build I bonded alloy tupe in to exits to strengthen them.

Dave Park

 	  Quote: 	
		   On 3 Sep 2020, at 15:37, Jeff B <topglock(at)cox.net> wrote:

 ï»¿

 Steve, you should be fine as long as the internal diameter of the tube is equal to or greater than the internal diameter of the carb opening.

 Jeff

 "I believe that forgiving them is God's function. Our job is to arrange the meeting."

 -Gen. Norman Schwarzkopf

> On 9/3/2020 8:40 AM, Steven Pitt wrote:

> 

> I have had to repair my airbox as it split under the clamp.

> Can anyone tell me how critical the airflow into the carburettors via the box is? Do I need to ensure a smooth and equal airflow?

> I suspect not as the quality of the airbox is somewhat rudimentary.

> For information I made up some â€˜bid' tube and epoxied it into the existing airflow tube. I have tried to make the entrance a smooth as possible.

> Thank you.

> Steve Pitt

> G-SMDH

Duncan McFadyean

Joined: 18 Jan 2011
Posts: 219

Posted: Thu Sep 03, 2020 8:39 am Post subject: Airbox for 912S

Steve,

The air entry to the carbs is quite critical and should ideally be smooth and tapering inwards from a larger diameter, which the Europa airbox more or less achieves. Generally a 2 degree inward taper will help to preserve lamina flow in the runner, as is often seen on the runners of injected engines.

This is further evidenced by the adverse impact on carburation that sharply curved SCAT tube and/or long parallel-sided runners has, such as on some Jabiru and VW installations.

Duncan McF.

 	  Quote: 	
		   On 03 September 2020 at 15:30 Jeff B <topglock(at)cox.net> wrote:

 Steve, you should be fine as long as the internal diameter of the tube 

 is equal to or greater than the internal diameter of the carb opening.

 Jeff

 "I believe that forgiving them is God's function. Our job is to arrange 

 the meeting."

 -Gen. Norman Schwarzkopf

 On 9/3/2020 8:40 AM, Steven Pitt wrote:

 > 

 > 

 > I have had to repair my airbox as it split under the clamp.

 > Can anyone tell me how critical the airflow into the carburettors via the box is? Do I need to ensure a smooth and equal airflow?

 > 

 > I suspect not as the quality of the airbox is somewhat rudimentary.

 > 

 > For information I made up some â€˜bid' tube and epoxied it into the existing airflow tube. I have tried to make the entrance a smooth as possible.

 > 

 > Thank you.

 > Steve Pitt

 > G-SMDH

 > 

 > 

 >

stevenwpitt(at)me.com
Guest

Posted: Sat Sep 05, 2020 7:03 am Post subject: Airbox for 912S

Now I have a dilemma. I have measured the diameter of the inner carburettor at 45mm. The airbox outer tube is 48/49mm - the inner diameter 39 and 42mm (these measurements after my fix - several layers of bid to strengthen the orifices after they collapsed under the tightness of the worm driven band).

I have never had a problem with the carburettors and never given any thought to a mismatch between the two diameters. I was always aware the the box was poorly finished and the air intakes were easy to crush, but with the bolt holding the box to the engine frame it had never departed giving me an inflight issue.

It is also notable that the two orifices were not the same size even before the collapse.

The only way I can see to equalise the two is to rebuild the airbox as per Dave Ps suggestion - cut the ends off - find an aluminium tube with inside diameter of 45mm and bond that in with bid. Anyone got any tube to that size?

Anyone else wishing to add any advice before I carve the boxes up. Also what is the airbox made from? It looks like chopped strand mat fibreglass.

Regards

Steve

G-SMDH

 	  Quote: 	
		   On 3 Sep 2020, at 15:45, david park <dpark748(at)me.com> wrote:

 When I had a airbox on initial build I bonded alloy tupe in to exits to strengthen them.

 Dave Park

> On 3 Sep 2020, at 15:37, Jeff B <topglock(at)cox.net> wrote:

> 

> ï»¿

> 

> Steve, you should be fine as long as the internal diameter of the tube is equal to or greater than the internal diameter of the carb opening.

> 

> Jeff

> 

> "I believe that forgiving them is God's function. Our job is to arrange the meeting."

> 

> -Gen. Norman Schwarzkopf

> 

>> On 9/3/2020 8:40 AM, Steven Pitt wrote:

>> 

>> I have had to repair my airbox as it split under the clamp.

>> Can anyone tell me how critical the airflow into the carburettors via the box is? Do I need to ensure a smooth and equal airflow?

>> I suspect not as the quality of the airbox is somewhat rudimentary.

>> For information I made up some â€˜bid' tube and epoxied it into the existing airflow tube. I have tried to make the entrance a smooth as possible.

>> Thank you.

>> Steve Pitt

>> G-SMDH

> 

> 

>

budyerly@msn.com

Joined: 05 Oct 2019
Posts: 286
Location: Florida USA

Posted: Sat Sep 05, 2020 4:32 pm Post subject: Airbox for 912S

Steve, 

The bing 64 has a 50mm OD inlet for the filter or airbox attachment.  The bore is nominally 36mm.   

The airbox (aka really cheap polyester chop and glass bit from Europa) have ends that attach to the carb are 50 mm tapering up 52 mm ish.  The chop on some of these is so bad I had to reinforce it for the pop rivets on the nutplate it shattered  so bad. 

Jeff Roberts was the first I had seen modify his airbox due to cracking.  It appeared he used a piece of two inch aluminum tubing and slid it into the well ground out holes in his airbox and aligned the tubes with his carbs and allowed  the floxed tubes to cure, then wrapped the glass around the tube outside the rubber tube to final bond the outside of his tubing. 

I copied Jeffâ€™s later on using the 1 7/8 inch aluminum tube left over from the main pitch rod.  I ground out the cracked airbox and inserted the 1 7/8 (47.6 mm) tube with flox and Redux (any epoxy will do) and then wrapped layers of bid  around until I was about 50 mm or 1 15/16 inches diameter.  Then shaped to get an easy fit of my two inch rubber hose.  I was OK with this method since the connecting hose allowed the two inlets on the bing carb inlet sufficient clean air for normal operation.   On a later aircraft I used 2 inch tube.  The hose clamp clearly compressed the hose more on the carb side than on the inlet box with the two inch tube. 

Epoxy sticks to just about anything but oil and grease so it will make a good repair bond to the clean and roughed up polyester without a problem of bonding.  Remember to rough up the aluminum as usual also. 

So you have two methods, either an innie or outie method.   

Note:  The airbox does not have to be really smooth on the inside.  It is a plenum not a tuned inlet.  The bing carb sucks air rather than ram air entering the carb on the 912S.  The transition humps and bumps should be minimized but just  make both ends about the same and all will be fine.  Remember, the bing has an inlet on the inside above and below the bore so make sure they can get reasonably clear air... 

Of course Rotax wants you to buy their $1000 intake plenum.  The only problem is it tends to lack support and since it hangs on the carb, it cracks those expensive 43mm rubber carb manifold to carb flange.  Support the inlet plenum, that  supports the carb and those rubber carb flange adapters last almost forever.  

Just my opinion, 

Best Regards to Mary also, 

Bud Yerly 

Best Regards, 

Bud Yerly 

Sent from  Mail for Windows 10 

From: Steven Pitt (stevenwpitt(at)me.com)

 Sent: Saturday, September 5, 2020 11:09 AM

 To: europa-list(at)matronics.com (europa-list(at)matronics.com)

 Subject: Re: Europa-List: Airbox for 912S 

--> Europa-List message posted by: Steven Pitt <stevenwpitt(at)me.com>

 Now I have a dilemma. I have measured the diameter of the inner carburettor at 45mm. The airbox outer tube is 48/49mm - the inner diameter 39 and 42mm (these measurements after my fix - several layers of bid to strengthen the orifices after they collapsed under  the tightness of the worm driven band).

 I have never had a problem with the carburettors and never given any thought to a mismatch between the two diameters. I was always aware the the box was poorly finished and the air intakes were easy to crush, but with the bolt holding the box to the engine  frame it had never departed giving me an inflight issue.

 It is also notable that the two orifices were not the same size even before the collapse.

 The only way I can see to equalise the two is to rebuild the airbox as per Dave Ps suggestion - cut the ends off - find an aluminium tube with inside diameter of 45mm and bond that in with bid. Anyone got any tube to that size?

 Anyone else wishing to add any advice before I carve the boxes up. Also what is the airbox made from? It looks like chopped strand mat fibreglass.

 Regards

 Steve

 G-SMDH

 > On 3 Sep 2020, at 15:45, david park <dpark748(at)me.com> wrote:

 > 

 > --> Europa-List message posted by: david park <dpark748(at)me.com>

 > 

 > When I had a airbox on initial build I bonded alloy tupe in to exits to strengthen them.

 > 

 > Dave Park

 > 

 > 

 >> On 3 Sep 2020, at 15:37, Jeff B <topglock(at)cox.net> wrote:

 >> 

 >> ï»¿--> Europa-List message posted by: Jeff B <topglock(at)cox.net>

 >> 

 >> Steve, you should be fine as long as the internal diameter of the tube is equal to or greater than the internal diameter of the carb opening.

 >> 

 >> Jeff

 >> 

 >> "I believe that forgiving them is God's function. Our job is to arrange the meeting."

 >> 

 >> -Gen. Norman Schwarzkopf

 >> 

 >>> On 9/3/2020 8:40 AM, Steven Pitt wrote:

 >>> --> Europa-List message posted by: Steven Pitt <stevenwpitt(at)me.com>

 >>> I have had to repair my airbox as it split under the clamp.

 >>> Can anyone tell me how critical the airflow into the carburettors via the box is? Do I need to ensure a smooth and equal airflow?

 >>> I suspect not as the quality of the airbox is somewhat rudimentary.

 >>> For information I made up some â€˜bid' tube and epoxied it into the existing airflow tube. I have tried to make the entrance a smooth as possible.

 >>> Thank you.

 >>> Steve Pitt

 >>> G-SMDH

 >> 

 >> 

 >> 

 > 

 > 

 > 

 >

budyerly@msn.com

Joined: 05 Oct 2019
Posts: 286
Location: Florida USA

Posted: Sun Sep 06, 2020 5:58 am Post subject: Re: Airbox for 912S

Steve,

The bing 64 has a 50mm OD inlet for the filter or airbox attachment.  The bore is nominally 36mm.  



The airbox (aka really cheap polyester chop and glass bit from Europa) have ends that attach to the carb are 50 mm tapering up 52 mm ish.  The chop on some of these is so bad I had to reinforce it for the pop rivets on the nutplate it shattered so bad.



Jeff Roberts was the first I had seen modify his airbox due to cracking.  It appeared he used a piece of two inch aluminum tubing and slid it into the well ground out holes in his airbox and aligned the tubes with his carbs and allowed the floxed tubes to cure, then wrapped the glass around the tube outside the rubber tube to final bond the outside of his tubing.

  

I copied Jeffâ€™s later on using the 1 7/8 inch aluminum tube left over from the main pitch rod.  I ground out the cracked airbox and inserted the 1 7/8 (47.6 mm) tube with flox and Redux (any epoxy will do) and then wrapped layers of bid around until I was about 50 mm or 1 15/16 inches diameter.  Then shaped to get an easy fit of my two inch rubber hose.  I was OK with this method since the connecting hose allowed the two inlets on the bing carb inlet sufficient clean air for normal operation.  On a later aircraft I used 2 inch tube.  The hose clamp clearly compressed the hose more on the carb side than on the inlet box with the two inch tube.



Epoxy sticks to just about anything but oil and grease so it will make a good repair bond to the clean and roughed up polyester without a problem of bonding.  Remember to rough up the aluminum as usual also.



So you have two methods, either an innie or outie method.  



Note:  The airbox does not have to be really smooth on the inside.  It is a plenum not a tuned inlet.  The bing carb sucks air rather than ram air entering the carb on the 912S.  The transition humps and bumps should be minimized but just make both ends about the same and all will be fine.  Remember, the bing has an inlet on the inside above and below the bore so make sure they can get reasonably clear air...



Of course Rotax wants you to buy their $1000 intake plenum.  The only problem is it tends to lack support and since it hangs on the carb, it cracks those expensive 43mm rubber carb manifold to carb flange.  Support the inlet plenum, that supports the carb and those rubber carb flange adapters last almost forever. 



Just my opinion,



Best Regards to Mary also,

Bud Yerly



Best Regards,

Bud Yerly

SwiftTG

Joined: 01 Oct 2018
Posts: 3

Posted: Mon Sep 07, 2020 3:26 am Post subject: Re: Airbox for 912S

I just wanted to comment on a note in Buds reply regarding the "really cheap polyester chop and glass bit from Europa". I do not know what part is being referred to but nothing is now supplied from Europa in chop strand. As a relevant example the Mod 42 airbox is manufactured from 92125 cloth.

_________________
David Stanbridge

Europa Aircraft (2004) Limited
www.europa-aircraft.com

technical@europa-aircraft.com

budyerly@msn.com

Joined: 05 Oct 2019
Posts: 286
Location: Florida USA

Posted: Mon Sep 07, 2020 4:25 am Post subject: Airbox for 912S

David, 

And we thank you for the quality parts now manufactured. 

There was a time in the early 2000s that even the gelcoat was flaking and cracking terribly on all the accessory parts like speed kits and cowls.   

  

Thanks again, 

  

Bud Yerly 

  

Sent from  Mail for Windows 10 

   

From: SwiftTG (david.stanbridge(at)swifttg.com)

 Sent: Monday, September 7, 2020 7:32 AM

 To: europa-list(at)matronics.com (europa-list(at)matronics.com)

 Subject: Re: Airbox for 912S 

 

  

--> Europa-List message posted by: "SwiftTG" <david.stanbridge(at)swifttg.com>

 

 I just wanted to comment on a note in Buds reply regarding the "really cheap polyester chop and glass bit from Europa". I do not know what part is being referred to but nothing is now supplied from Europa in chop strand. As a relevant example the Mod 42 airbox  is manufactured from 92125 cloth.

 

 --------

 David Stanbridge

  

 Europa Aircraft (2004) Limited

 www.europa-aircraft.com

  

 technical(at)europa-aircraft.com

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=498165#498165

 

 

 

 

 

 

 ===========

 st Email Forum -

 pa-List">http://www.matronics.com/Navigator?Europa-List

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 p;   - MATRONICS WEB FORUMS -

 ums.matronics.com

 ===========

 p;  - NEW MATRONICS LIST WIKI -

 matronics.com

 ===========

 p; - List Contribution Web Site -

 p;                  -Matt Dralle, List Admin.

 http://www.matronics.com/contribution

 ===========

churchy

Joined: 04 Nov 2011
Posts: 48

Posted: Mon Sep 07, 2020 6:35 am Post subject: Airbox for 912S

Bud



Not just the accessories - I have a fuselage top with flaking â€˜gelcoatâ€™ which I am still trying to resolve.



Richard C-C



Sent from my iPad



 	  Quote: 	
		  On 7 Sep 2020, at 13:30, Bud Yerly <budyerly(at)msn.com> wrote:



ï»¿        

David, 

And we thank you for the quality parts now manufactured. 

There was a time in the early 2000s that even the gelcoat was flaking and cracking terribly on all the accessory parts like speed kits and cowls.   

  

Thanks again, 

  

Bud Yerly 

  

Sent from  Mail for Windows 10 

   

From: SwiftTG (david.stanbridge(at)swifttg.com)

 Sent: Monday, September 7, 2020 7:32 AM

 To: europa-list(at)matronics.com (europa-list(at)matronics.com)

 Subject: Re: Airbox for 912S 

 

  

--> Europa-List message posted by: "SwiftTG" <david.stanbridge(at)swifttg.com>

 

 I just wanted to comment on a note in Buds reply regarding the "really cheap polyester chop and glass bit from Europa". I do not know what part is being referred to but nothing is now supplied from Europa in chop strand. As a relevant example the Mod 42 airbox  is manufactured from 92125 cloth.

 

 --------

 David Stanbridge

  

 Europa Aircraft (2004) Limited

 www.europa-aircraft.com

  

 technical(at)europa-aircraft.com

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=498165#498165

 

 

 

 

 

 

 ===========

 st Email Forum -

 pa-List">http://www.matronics.com/Navigator?Europa-List

 ===========

 p;   - MATRONICS WEB FORUMS -

 ums.matronics.com

 ===========

 p;  - NEW MATRONICS LIST WIKI -

 matronics.com

 ===========

 p; - List Contribution Web Site -

 p;                  -Matt Dralle, List Admin.

 http://www.matronics.com/contribution

 ===========

iancook_1(at)hotmail.com
Guest

Posted: Mon Sep 07, 2020 7:12 am Post subject: Airbox for 912S

Richard how is the building going. With Bicester closing down I donâ€™t Alan Twigg has still not flown his MG yet. I now have about 70Hrs on mine, 

 

 Sent from my iPhone

 

  	  Quote: 	
		  On 7 Sep 2020, at 15:38, Richard Churchill-Coleman <richard.churchill-coleman(at)sky.com> wrote:

 

  ï»¿ Bud 

 

 Not just the accessories - I have a fuselage top with flaking â€˜gelcoatâ€™ which I am still trying to resolve. 

 

 Richard C-C

 

 Sent from my iPad

 

  	  Quote: 	
		  On 7 Sep 2020, at 13:30, Bud Yerly <budyerly(at)msn.com> wrote:

 

  ï»¿     

David, 

And we thank you for the quality parts now manufactured. 

There was a time in the early 2000s that even the gelcoat was flaking and cracking terribly on all the accessory parts like speed kits and cowls.   

  

Thanks again, 

  

Bud Yerly 

  

Sent from  Mail for Windows 10 

   

From: SwiftTG (david.stanbridge(at)swifttg.com)

 Sent: Monday, September 7, 2020 7:32 AM

 To: europa-list(at)matronics.com (europa-list(at)matronics.com)

 Subject: Europa-List: Re: Airbox for 912S 

 

  

--> Europa-List message posted by: "SwiftTG" <david.stanbridge(at)swifttg.com>

 

 I just wanted to comment on a note in Buds reply regarding the "really cheap polyester chop and glass bit from Europa". I do not know what part is being referred to but nothing is now supplied from Europa in chop strand. As a relevant example the Mod 42 airbox  is manufactured from 92125 cloth.

 

 --------

 David Stanbridge

  

 Europa Aircraft (2004) Limited

 www.europa-aircraft.com

  

 technical(at)europa-aircraft.com

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=498165#498165

 

 

 

 

 

 

 ===========

 st Email Forum -

 pa-List">http://www.matronics.com/Navigator?Europa-List

 ===========

 p;   - MATRONICS WEB FORUMS -

 ums.matronics.com

 ===========

 p;  - NEW MATRONICS LIST WIKI -

 matronics.com

 ===========

 p; - List Contribution Web Site -

 p;                  -Matt Dralle, List Admin.

 http://www.matronics.com/contribution

 ===========

alan.twigg775(at)gmail.co
Guest

Posted: Mon Sep 07, 2020 8:02 am Post subject: Airbox for 912S

Not flown yet but complete and paperwork at the LAA actually being worked right now.Alan



Sent from my iPhone



 	  Quote: 	
		  On 7 Sep 2020, at 16:14, Ian Cook <IanCook_1(at)hotmail.com> wrote:



ï»¿     Richard how is the building going. With Bicester closing down I donâ€™t Alan Twigg has still not flown his MG yet. I now have about 70Hrs on mine, 

 

 Sent from my iPhone

 

  	  Quote: 	
		  On 7 Sep 2020, at 15:38, Richard Churchill-Coleman <richard.churchill-coleman(at)sky.com> wrote:

 

  ï»¿ Bud 

 

 Not just the accessories - I have a fuselage top with flaking â€˜gelcoatâ€™ which I am still trying to resolve. 

 

 Richard C-C

 

 Sent from my iPad

 

  	  Quote: 	
		  On 7 Sep 2020, at 13:30, Bud Yerly <budyerly(at)msn.com> wrote:

 

  ï»¿     

David, 

And we thank you for the quality parts now manufactured. 

There was a time in the early 2000s that even the gelcoat was flaking and cracking terribly on all the accessory parts like speed kits and cowls.   

  

Thanks again, 

  

Bud Yerly 

  

Sent from  Mail for Windows 10 

   

From: SwiftTG (david.stanbridge(at)swifttg.com)

 Sent: Monday, September 7, 2020 7:32 AM

 To: europa-list(at)matronics.com (europa-list(at)matronics.com)

 Subject: Re: Airbox for 912S 

 

  

--> Europa-List message posted by: "SwiftTG" <david.stanbridge(at)swifttg.com>

 

 I just wanted to comment on a note in Buds reply regarding the "really cheap polyester chop and glass bit from Europa". I do not know what part is being referred to but nothing is now supplied from Europa in chop strand. As a relevant example the Mod 42 airbox  is manufactured from 92125 cloth.

 

 --------

 David Stanbridge

  

 Europa Aircraft (2004) Limited

 www.europa-aircraft.com

  

 technical(at)europa-aircraft.com

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=498165#498165

 

 

 

 

 

 

 ===========

 st Email Forum -

 pa-List">http://www.matronics.com/Navigator?Europa-List

 ===========

 p;   - MATRONICS WEB FORUMS -

 ums.matronics.com

 ===========

 p;  - NEW MATRONICS LIST WIKI -

 matronics.com

 ===========

 p; - List Contribution Web Site -

 p;                  -Matt Dralle, List Admin.

 http://www.matronics.com/contribution

 ===========

richard.holder(at)outlook
Guest

Posted: Wed Sep 09, 2020 1:34 am Post subject: Airbox for 912S

On 05/09/2020 16:01, Steven Pitt wrote



 	  Quote: 	
		   

 <stevenwpitt(at)me.com>

 

 Now I have a dilemma. I have measured the diameter of

 the inner carburettor at 45mm. The airbox outer tube is

 48/49mm - the inner diameter 39 and 42mm (these

 measurements after my fix - several layers of bid to

 strengthen the orifices after they collapsed under the

 tightness of the worm driven band).

 

 I have never had a problem with the carburettors and

 never given any thought to a mismatch between the two

 diameters. I was always aware the the box was poorly

 finished and the air intakes were easy to crush, but

 with the bolt holding the box to the engine frame it

 had never departed giving me an inflight issue.

 

 It is also notable that the two orifices were not the

 same size even before the collapse.

 

 The only way I can see to equalise the two is to

 rebuild the airbox as per Dave Ps suggestion - cut the

 ends off - find an aluminium tube with inside diameter

 of 45mm and bond that in with bid. Anyone got any tube

 to that size?

 

 Anyone else wishing to add any advice before I carve

 the boxes up. Also what is the airbox made from? It

 looks like chopped strand mat fibreglass.


	


Steven, just seen this.



When my airbox tubes compressed I used short lengths of

steel exhaust pipe with the correct OD (to match the carb

inlet OD).



I dremelled away enough of the original fibreglass to get

the exhaust tube (ET) to fit nicely using the carbs as the

locational template. I drilled a few holes in the ET to

allow keying. I then resined (with a filler) in the ETs

without worrying about the actual orifice size.



When the resin had gone off I dremelled out all the

surplus resin on the inside leaving it reasonably smooth.

Much stronger than the original, and as the air passage is

now much larger than it was the engine runs less rich !

And I can do the Jubillee clips up tight. I bought short

lengths of silicone hose with ID to match the carb inlet.



Not patented !



Richard

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