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
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>
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