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May be time to look at the accelerator pump. My brother had a similar issue
with his 40 IDF's. He WAS using gas with ethanol
and it was leaving crusty deposits in the carbs every race & now buys
non-ethanol ( av-gas ).
jim g
----- Original Message -----
From: "D V" <explore8@outlook.com>
To: "Scott Barr" <sbarr@McCarty-Law.com>, "fot" <fot@autox.team.net>
Sent: Sunday, October 16, 2016 9:14:15 PM
Subject: Re: [Fot] Fwd: Stutter at 4K rpm
Thanks again everyone. I checked the header to head and the exhaust to header
connection and everything seemed tight. However I went 2 off hard at turn 4
this morning and my strap that was holding the exhaust is now mostly gone. I
never figured out that 180 degree off camber turn all weekend.
To answer Scott's question, yes. I can brake downshift to 3rd in a turn. Full
on the gas out of the turn and it stutters between 4-5k. If I do the same and
ease into the gas I can most of the time keep it steady.
Re working the exhaust system as well as checking the float will be added to my
winter maintenance.
Sent from my iPhone
> On Oct 16, 2016, at 2:21 PM, Barr, Scott <sbarr@McCarty-Law.com> wrote:
>
> Is it temporary? Just as you get on the gas out of a corner and then clears
> up as the revs rise?
>
> If so, do you have no oil in your dashpots or have you removed the dashpot
> pistons?
>
> Scott (B.)
>
>
>
>
>
> -------- Original message --------
> From: D V <explore8@outlook.com>
> Date: 10/16/16 12:53 AM (GMT-06:00)
> To: Greg Blake <gblake58tr3@icloud.com>, fot@autox.team.net
> Subject: Re: [Fot] Fwd: Stutter at 4K rpm
>
> Thanks everyone for the replies. I will inspect the pipe to manifold and
> manifold to head to see if anything is loose or any leaks apparent in the
> morning.
>
> I actually went down a main jet 145 to 140 and that seemed like it helped
> some but didn't clear up the issue (which is going leaner; opposite of what
> Greg said).
>
> It is missing and backfiring when I am full on the gas. I can prevent it by
> easing into the gas.
>
> I did notice some gas at my air cleaner to velocity stack connection. I
> wonder if it is a float issue?
>
>
> Sent from my iPhone
>
>
> Don't know if my other email made it to you. Backfires on deceleration can be
> a lean condition. Have you checked your plugs? Maybe something got "adjusted"
> with the bump.
>
> Sent from my iPhone
>
>
>
>
> Sent from my iPhone
>
> Begin forwarded message:
>
> Date: October 15, 2016 at 10:30:51 AM CDT
> Subject: Stutter at 4K rpm
>
> Two races ago I went off track and bent my exhaust pipe enough to break the
> welded joint near the muffler. In the interest of time, I cut the exhaust at
> the muffler and secured the pipe to the frame.
>
> At the last race, I noticed the car would backfire at deceleration which I am
> not surprised but I also noticed a stutter around 4-5k rpm.
>
> At NOLA this weekend it is more pronounced and comes in when shifting hard
> from 3rd to 4th. After 5k, it clears up and pulls normally.
>
> It doesn't seem to be affected by turns and more related to full throttle vs
> easing into the gas.
>
> Backpressure from the loss of muffler or unrelated issues?
>
> 1300 spitfire with single Weber 40.
>
> Sent from my iPhone
> _______________________________________________
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/fot/gblake58tr3@icloud.com
>
>
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://www.team.net/archive
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<html><body><div style=3D"font-family: Arial; font-size: 12pt; color: #0000=
00"><div aria-label=3D"Compose body">May be time to look at the accelerator=
pump. My brother had a similar issue with his 40 IDF's. He WAS using gas w=
ith ethanol</div><div aria-label=3D"Compose body">and it was leaving crusty=
deposits in the carbs every race & now buys non-ethanol ( av-gas ).</d=
iv><div aria-label=3D"Compose body">jim g</div><div><br></div><hr id=3D"zwc=
hr"><div style=3D"color:#000;font-weight:normal;font-style:normal;text-deco=
ration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;" data-mc=
e-style=3D"color: #000; font-weight: normal; font-style: normal; text-decor=
ation: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><b>=
From: </b>"D V" <explore8@outlook.com><br><b>To: </b>"Scott Barr" <=
;sbarr@McCarty-Law.com>, "fot" <fot@autox.team.net><br><b>Sent: </=
b>Sunday, October 16, 2016 9:14:15 PM<br><b>Subject: </b>Re: [Fot] Fwd: Stu=
tter at 4K rpm<br><div><br></div>Thanks again everyone. I checked the heade=
r to head and the exhaust to header connection and everything seemed tight.=
However I went 2 off hard at turn 4 this morning and my strap that was hol=
ding the exhaust is now mostly gone. I never figured out that 180 degree of=
f camber turn all weekend.<br><div><br></div>To answer Scott's question, ye=
s. I can brake downshift to 3rd in a turn. Full on the gas out of the turn =
and it stutters between 4-5k. If I do the same and ease into the gas I can =
most of the time keep it steady.<br><div><br></div>Re working the exhaust s=
ystem as well as checking the float will be added to my winter maintenance.=
<br><div><br></div>Sent from my iPhone<br><div><br></div>> On Oct 16, 2=
016, at 2:21 PM, Barr, Scott <sbarr@McCarty-Law.com> wrote:<br>> <=
br>> Is it temporary? Just as you get on the gas out of a corner a=
nd then clears up as the revs rise?<br>> <br>> If so, do you have no =
oil in your dashpots or have you removed the dashpot pistons?<br>> <br>&=
gt; Scott (B.)<br>> <br>> <br>> <br>> <br>> <br>> -------=
- Original message --------<br>> From: D V <explore8@outlook.com><=
br>> Date: 10/16/16 12:53 AM (GMT-06:00)<br>> To: Greg Blake <gbla=
ke58tr3@icloud.com>, fot@autox.team.net<br>> Subject: Re: [Fot] Fwd: =
Stutter at 4K rpm<br>> <br>> Thanks everyone for the replies. I will =
inspect the pipe to manifold and manifold to head to see if anything is loo=
se or any leaks apparent in the morning.<br>> <br>> I actually went d=
own a main jet 145 to 140 and that seemed like it helped some but didn't cl=
ear up the issue (which is going leaner; opposite of what Greg said).<br>&g=
t; <br>> It is missing and backfiring when I am full on the gas. I can p=
revent it by easing into the gas.<br>> <br>> I did notice some gas at=
my air cleaner to velocity stack connection. I wonder if it is a float iss=
ue?<br>> <br>> <br>> Sent from my iPhone<br>> <br>> On Oct 1=
5, 2016, at 7:35 PM, Greg Blake <gblake58tr3@icloud.com<mailto:gblake=
58tr3@icloud.com>> wrote:<br>> <br>> Don't know if my other ema=
il made it to you. Backfires on deceleration can be a lean condition. Have =
you checked your plugs? Maybe something got "adjusted" with the bump.=
<br>> <br>> Sent from my iPhone<br>> <br>> On Oct 15, 2016, at =
12:27 PM, D V <explore8@outlook.com<mailto:explore8@outlook.com>&g=
t; wrote:<br>> <br>> <br>> <br>> Sent from my iPhone<br>> <b=
r>> Begin forwarded message:<br>> <br>> From: <explore8@outlook=
.com<mailto:explore8@outlook.com>><br>> Date: October 15, 2016 =
at 10:30:51 AM CDT<br>> To: <fot@autox.team.net<mailto:fot@autox.t=
eam.net>><br>> Subject: Stutter at 4K rpm<br>> <br>> Two rac=
es ago I went off track and bent my exhaust pipe enough to break the welded=
joint near the muffler. In the interest of time, I cut the exhaust at the =
muffler and secured the pipe to the frame.<br>> <br>> At the last rac=
e, I noticed the car would backfire at deceleration which I am not surprise=
d but I also noticed a stutter around 4-5k rpm.<br>> <br>> At NOLA th=
is weekend it is more pronounced and comes in when shifting hard from 3rd t=
o 4th. After 5k, it clears up and pulls normally.<br>> <br>> It doesn=
't seem to be affected by turns and more related to full throttle vs easing=
into the gas.<br>> <br>> Backpressure from the loss of muffler or un=
related issues?<br>> <br>> 1300 spitfire with single Weber 40.<br>>=
; <br>> Sent from my iPhone<br>> ____________________________________=
___________<br>> fot@autox.team.net<mailto:fot@autox.team.net><br>=
> <br>> http://www.fot-racing.com<br>> <br>> Donate: http://www=
.team.net/donate.html<br>> Archive: http://www.team.net/archive<br>> =
.team.net/mailman/options/fot/gblake58tr3@icloud.com<br>> <br>> <br>_=
______________________________________________<br>fot@autox.team.net<br><di=
v><br></div>http://www.fot-racing.com<br><div><br></div>Donate: http://www.=
team.net/donate.html<br>Archive: http://www.team.net/archive<br>Forums: htt=
p://www.team.net/forums<br>Unsubscribe/Manage: http://autox.team.net/mailma=
n/options/fot/toodamnfunky@comcast.net<br><div><br></div><br></div><div><br=
></div></div></body></html>
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_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://www.team.net/archive
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