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sajdds(at)comcast.net
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 Posted: Fri Sep 03, 2010 6:28 am Post subject: Accelerator jet modification |
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I recently had Dennis Savarese swap the two accelerator jets on the carburetor of my M14P. This totally eliminated all hesitation when adding power on final. It is an easy modification that takes about an hour. The carb is a little difficult to reach but the time spent is well worth it. He merely switched the two jets with each other, no new parts needed. Thanks Dennis.
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
[quote][b]
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radiopicture
Joined: 23 Jun 2008
Posts: 263
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| Posted: Fri Sep 03, 2010 6:37 am Post subject: Accelerator jet modification |
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Steve:
Have you noticed any difference in CHT?
-Eric
On Sep 3, 2010, at 10:22 AM, Steven Johnson wrote:
| Quote: | I recently had Dennis Savarese swap the two accelerator jets on the carburetor of my M14P. This totally eliminated all hesitation when adding power on final. It is an easy modification that takes about an hour. The carb is a little difficult to reach but the time spent is well worth it. He merely switched the two jets with each other, no new parts needed. Thanks Dennis.
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
| Quote: |
style="color: blue; text-decoration: underline; ">http://www.matronics.com/Navigator?Yak-List
blue; text-decoration: underline; ">http://forums.matronics.com
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[quote][b]
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sajdds(at)comcast.net
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| Posted: Fri Sep 03, 2010 6:50 am Post subject: Accelerator jet modification |
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I did not observe any change in CHT. My engine is running better than before, although Dennis also found a couple of loose intake gland nuts and tightened them at the same time he switched the jets in the carb. It is really nice to push the throttle forward and feel an immediate surge in power.
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Eric Wobschall
Sent: Friday, September 03, 2010 10:32 AM
To: yak-list(at)matronics.com
Subject: Re: Accelerator jet modification
Steve:
Have you noticed any difference in CHT?
-Eric
On Sep 3, 2010, at 10:22 AM, Steven Johnson wrote:
I recently had Dennis Savarese swap the two accelerator jets on the carburetor of my M14P. This totally eliminated all hesitation when adding power on final. It is an easy modification that takes about an hour. The carb is a little difficult to reach but the time spent is well worth it. He merely switched the two jets with each other, no new parts needed. Thanks Dennis.
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
0123456789012345
[quote][b]
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radiopicture
Joined: 23 Jun 2008
Posts: 263
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| Posted: Fri Sep 03, 2010 6:55 am Post subject: Accelerator jet modification |
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Great!
On Sep 3, 2010, at 10:50 AM, Steven Johnson wrote:
| Quote: | I did not observe any change in CHT. My engine is running better than before, although Dennis also found a couple of loose intake gland nuts and tightened them at the same time he switched the jets in the carb. It is really nice to push the throttle forward and feel an immediate surge in power.
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
From: owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com) [mailto:owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com)] On Behalf Of Eric Wobschall
Sent: Friday, September 03, 2010 10:32 AM
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Subject: Re: Accelerator jet modification
Steve:
Have you noticed any difference in CHT?
-Eric
On Sep 3, 2010, at 10:22 AM, Steven Johnson wrote:
I recently had Dennis Savarese swap the two accelerator jets on the carburetor of my M14P. This totally eliminated all hesitation when adding power on final. It is an easy modification that takes about an hour. The carb is a little difficult to reach but the time spent is well worth it. He merely switched the two jets with each other, no new parts needed. Thanks Dennis.
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
0123456789012345[/b][/b][/b][/b]
[b][b][b]6[/b][/b][/b][/b]
|
[quote][b]
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radiopicture
Joined: 23 Jun 2008
Posts: 263
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| Posted: Fri Sep 03, 2010 6:55 am Post subject: Accelerator jet modification |
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Which size jets did you use?
On Sep 3, 2010, at 10:50 AM, Steven Johnson wrote:
| Quote: | I did not observe any change in CHT. My engine is running better than before, although Dennis also found a couple of loose intake gland nuts and tightened them at the same time he switched the jets in the carb. It is really nice to push the throttle forward and feel an immediate surge in power.
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
From: owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com) [mailto:owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com)] On Behalf Of Eric Wobschall
Sent: Friday, September 03, 2010 10:32 AM
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Subject: Re: Accelerator jet modification
Steve:
Have you noticed any difference in CHT?
-Eric
On Sep 3, 2010, at 10:22 AM, Steven Johnson wrote:
I recently had Dennis Savarese swap the two accelerator jets on the carburetor of my M14P. This totally eliminated all hesitation when adding power on final. It is an easy modification that takes about an hour. The carb is a little difficult to reach but the time spent is well worth it. He merely switched the two jets with each other, no new parts needed. Thanks Dennis.
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
0123456789012345[/b][/b][/b][/b]
[b][b][b]6[/b][/b][/b][/b]
|
[quote][b]
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sajdds(at)comcast.net
Guest
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| Posted: Fri Sep 03, 2010 7:01 am Post subject: Accelerator jet modification |
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He just switched the two jets. The sizes were hard to read but I think one indicated 1.0mm and the other 0.6mm.
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Eric Wobschall
Sent: Friday, September 03, 2010 10:55 AM
To: yak-list(at)matronics.com
Subject: Re: Accelerator jet modification
Which size jets did you use?
On Sep 3, 2010, at 10:50 AM, Steven Johnson wrote:
I did not observe any change in CHT. My engine is running better than before, although Dennis also found a couple of loose intake gland nuts and tightened them at the same time he switched the jets in the carb. It is really nice to push the throttle forward and feel an immediate surge in power.
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
From: owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com) [mailto:owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com)] On Behalf Of Eric Wobschall
Sent: Friday, September 03, 2010 10:32 AM
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Subject: Re: Accelerator jet modification
Steve:
Have you noticed any difference in CHT?
-Eric
On Sep 3, 2010, at 10:22 AM, Steven Johnson wrote:
I recently had Dennis Savarese swap the two accelerator jets on the carburetor of my M14P. This totally eliminated all hesitation when adding power on final. It is an easy modification that takes about an hour. The carb is a little difficult to reach but the time spent is well worth it. He merely switched the two jets with each other, no new parts needed. Thanks Dennis.
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
01234567
89012345678901234567
[quote][b]
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radiopicture
Joined: 23 Jun 2008
Posts: 263
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| Posted: Fri Sep 03, 2010 7:11 am Post subject: Accelerator jet modification |
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thx
On Sep 3, 2010, at 11:00 AM, Steven Johnson wrote:
| Quote: | He just switched the two jets. The sizes were hard to read but I think one indicated 1.0mm and the other 0.6mm.
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
From: owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com) [mailto:owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com)] On Behalf Of Eric Wobschall
Sent: Friday, September 03, 2010 10:55 AM
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Subject: Re: Accelerator jet modification
Which size jets did you use?
On Sep 3, 2010, at 10:50 AM, Steven Johnson wrote:
I did not observe any change in CHT. My engine is running better than before, although Dennis also found a couple of loose intake gland nuts and tightened them at the same time he switched the jets in the carb. It is really nice to push the throttle forward and feel an immediate surge in power.
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
From: owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com) [mailto:owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com)] On Behalf Of Eric Wobschall
Sent: Friday, September 03, 2010 10:32 AM
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Subject: Re: Accelerator jet modification
Steve:
Have you noticed any difference in CHT?
-Eric
On Sep 3, 2010, at 10:22 AM, Steven Johnson wrote:
I recently had Dennis Savarese swap the two accelerator jets on the carburetor of my M14P. This totally eliminated all hesitation when adding power on final. It is an easy modification that takes about an hour. The carb is a little difficult to reach but the time spent is well worth it. He merely switched the two jets with each other, no new parts needed. Thanks Dennis.
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
01234567
89012345678901234567[/b][/b][/b][/b]
[b][b][b]8[/b][/b][/b][/b]
|
[quote][b]
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andy717(at)comcast.net
Guest
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| Posted: Fri Sep 03, 2010 8:59 am Post subject: Accelerator jet modification |
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I am actually getting fairly close to pulling out my M14 and was thinking this might be a good time to do this modification. Does Dennis or anyone have any documentation that might take me through this step by step? I have 0 time working on this engine, so if you guys think this is too technical, I’ll hold off.
It would be nice to not have to go through the “hesitancy” learning curve --
Thank you,
Andy Hawes
Radial Rocket
Nashville, TN
On 9/3/10 10:10 AM, "Eric Wobschall" <eric(at)buffaloskyline.com> wrote:
| Quote: | thx
On Sep 3, 2010, at 11:00 AM, Steven Johnson wrote:
| Quote: | He just switched the two jets. The sizes were hard to read but I think one indicated 1.0mm and the other 0.6mm.
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] ([email]owner-yak-list-server(at)matronics.com][/email]) On Behalf Of Eric Wobschall
Sent: Friday, September 03, 2010 10:55 AM
To: yak-list(at)matronics.com
Subject: Re: Accelerator jet modification
Which size jets did you use?
On Sep 3, 2010, at 10:50 AM, Steven Johnson wrote:
I did not observe any change in CHT. My engine is running better than before, although Dennis also found a couple of loose intake gland nuts and tightened them at the same time he switched the jets in the carb. It is really nice to push the throttle forward and feel an immediate surge in power.
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] ([email]owner-yak-list-server(at)matronics.com][/email]) On Behalf Of Eric Wobschall
Sent: Friday, September 03, 2010 10:32 AM
To: yak-list(at)matronics.com
Subject: Re: Accelerator jet modification
Steve:
Have you noticed any difference in CHT?
-Eric
On Sep 3, 2010, at 10:22 AM, Steven Johnson wrote:
I recently had Dennis Savarese swap the two accelerator jets on the carburetor of my M14P. This totally eliminated all hesitation when adding power on final. It is an easy modification that takes about an hour. The carb is a little difficult to reach but the time spent is well worth it. He merely switched the two jets with each other, no new parts needed. Thanks Dennis.
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
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mark.bitterlich(at)navy.m
Guest
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| Posted: Fri Sep 03, 2010 9:22 am Post subject: Accelerator jet modification |
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Just a heads up. Not ALL M-14P's have this hesitation problem. For
example... Mine does not! The problem is fairly common on the 400
horsepower PF model... But a lot of M-14P (360 horsepower) work just
fine without modifying the carb and for that matter, so do some
M-14PF's!
This is a TUNING change to the carb. The pressure carb used in the M-14
has a lot of jets that can be changed to make the engine perform as it
should. The jet being changed here impacts the way the engine reacts
when you MOVE the throttle. It does not impact the amount of fuel the
engine is receiving when it is just "running" normally, with your hand
off the throttle. As such changing this jet should not impact normal
running "fuel to air ratio", ... Thus it does not impact cylinder head
temps.
But it is not a change that you should just put into your engine just
because someone else did. If you are experiencing problems where when
you ADD POWER to the engine, it HESITATES and kind of "thinks about it
for a split second" and THEN kind of catches up with a surge of power,
then this would be a good thing to try in order to correct that
particular problem.
On the other hand, if your engine reacts properly when you add throttle,
with a smooth and immediate change in power... Just like when you push
down on the gas pedal in your car, then DO NOT MESS WITH THIS AT ALL!
Just saying.... 
Mark Bitterlich
--
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richard.goode(at)russiana
Guest
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| Posted: Fri Sep 03, 2010 9:28 am Post subject: Accelerator jet modification |
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I'm concerned that Yak owners might think that there is a simple mod for all engines in which 2 jets are changed.
Of course this might well work in one engine,but there are five jets,three of which can be changed for size.
I addition there are various other adjustments in terms of fuel pressure;altitude control.
It is not a simple carburetor,but so many in service are well out of adjustment!!
Richard
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
United Kingdom
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
[quote] ---
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cjpilot710(at)aol.com
Guest
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| Posted: Fri Sep 03, 2010 12:44 pm Post subject: Accelerator jet modification |
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When I received my M-14 from the factory (over 1,500 hours ago) and mounted it my CJ, I too had a hesitation problem. In the parts kit that came with the engine, were a set of jets for the carburetor acceleration pump. I simply got out the smallest one and installed it. I have had that jet in the engine since and not one hesitation problem since.
One group of guys recommended to put a be be in - in effect closing that jet entirely. I DO NOT IN ANYWAY SUGGEST THAT. But I do believe you need a smaller jet than the one you have now.
Pappy
--
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viperdoc(at)mindspring.co
Guest
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| Posted: Fri Sep 03, 2010 6:42 pm Post subject: Accelerator jet modification |
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Unless you want to simulate the hesitancy experienced when behind the power curve at the controls of a turbo jet. Which would the next aircraft you flew as a UPT student in the Russian AF. Not much need for that here now is it unless you going to be flying a L-29, L-39 in the near future, or T-37 in the near future.
Doc
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of cjpilot710(at)aol.com
Sent: Friday, September 03, 2010 3:43 PM
To: yak-list(at)matronics.com
Subject: Re: Accelerator jet modification
When I received my M-14 from the factory (over 1,500 hours ago) and mounted it my CJ, I too had a hesitation problem. In the parts kit that came with the engine, were a set of jets for the carburetor acceleration pump. I simply got out the smallest one and installed it. I have had that jet in the engine since and not one hesitation problem since.
One group of guys recommended to put a be be in - in effect closing that jet entirely. I DO NOT IN ANYWAY SUGGEST THAT. But I do believe you need a smaller jet than the one you have now.
Pappy
--
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andy717(at)comcast.net
Guest
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| Posted: Sat Sep 04, 2010 4:39 am Post subject: Accelerator jet modification |
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Thank you, I'll keep that in mind.
On 9/3/10 12:16 PM, "Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E"
<mark.bitterlich(at)navy.mil> wrote:
[quote]
MALS-14 64E" <mark.bitterlich(at)navy.mil>
Just a heads up. Not ALL M-14P's have this hesitation problem. For
example... Mine does not! The problem is fairly common on the 400
horsepower PF model... But a lot of M-14P (360 horsepower) work just
fine without modifying the carb and for that matter, so do some
M-14PF's!
This is a TUNING change to the carb. The pressure carb used in the M-14
has a lot of jets that can be changed to make the engine perform as it
should. The jet being changed here impacts the way the engine reacts
when you MOVE the throttle. It does not impact the amount of fuel the
engine is receiving when it is just "running" normally, with your hand
off the throttle. As such changing this jet should not impact normal
running "fuel to air ratio", ... Thus it does not impact cylinder head
temps.
But it is not a change that you should just put into your engine just
because someone else did. If you are experiencing problems where when
you ADD POWER to the engine, it HESITATES and kind of "thinks about it
for a split second" and THEN kind of catches up with a surge of power,
then this would be a good thing to try in order to correct that
particular problem.
On the other hand, if your engine reacts properly when you add throttle,
with a smooth and immediate change in power... Just like when you push
down on the gas pedal in your car, then DO NOT MESS WITH THIS AT ALL!
Just saying....
Mark Bitterlich
--
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dsavarese0812(at)bellsout
Guest
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| Posted: Sat Sep 04, 2010 6:25 am Post subject: Accelerator jet modification |
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Andy,
As Mark says, first see if the engine hesitates. Then if you need to make the modification, contact me off-list at dsavarese0812(at)bellsouth.net (dsavarese0812(at)bellsouth.net) and I will put something together for you. FWIW, this was not my creation. It came from the Termikas engine shop whom I have great respect for. We were discussing the old way of fixing the problem by plugging the accelerator pump jet. Termikas' engine shop came up with the "fix" and tested it on their engines, which is the mod which I made on Steve's 52 (and several others including my personal Yak52 before I sold it).
Dennis
[quote] ---
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yakplt(at)yahoo.com
Guest
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| Posted: Sat Sep 04, 2010 4:13 pm Post subject: Accelerator jet modification |
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"We were discussing the old way of fixing the problem by plugging the accelerator pump jet. Termikas' engine shop came up with the "fix" and tested it on their engines, which is the mod which I made on Steve's 52 (and several others including my personal Yak52 before I sold it)."
Hindsight is always 20/20, but I have to say that the way Dennis is doing it now (Termikas to be credited) is really the right way. Maybe plugging the jet actually worked in some cases, but being a Holly Carb tuner since ... a long time ago .... adjusting jet sizes for proper performance is ALWAYS the right way to go. Good on Termikas... but good on Dennis for making sure we all KNOW ABOUT IT!
Thanks Dennis.
Mark
--- On Sat, 9/4/10, A. Dennis Savarese <dsavarese0812(at)bellsouth.net> wrote:
[quote]
From: A. Dennis Savarese <dsavarese0812(at)bellsouth.net>
Subject: Re: Accelerator jet modification
To: yak-list(at)matronics.com
Date: Saturday, September 4, 2010, 10:23 AM
Andy,
As Mark says, first see if the engine hesitates. Then if you need to make the modification, contact me off-list at dsavarese0812(at)bellsouth.net (dsavarese0812(at)bellsouth.net) and I will put something together for you. FWIW, this was not my creation. It came from the Termikas engine shop whom I have great respect for. We were discussing the old way of fixing the problem by plugging the accelerator pump jet. Termikas' engine shop came up with the "fix" and tested it on their engines, which is the mod which I made on Steve's 52 (and several others including my personal Yak52 before I sold it).
Dennis
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