[Fot] Sputtering TR question

[Tim Murphy]

Just curious, how much total advance did you have when you were having the
problem?

Tim

-----Original Message-----
From: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] On
Behalf Of jameselbe at aol.com
Sent: Saturday, May 28, 2011 10:40 AM
To: duncan.charlton54 at gmail.com; fot at autox.team.net
Subject: Re: [Fot] Sputtering TR question

Here's one from left field. I had a similar problem on my TR4 racer. In my
case the ignition was a couple of degrees too far advanced. When the car got
hot it would sputter. Slow down for a short time and it would clear up and
run
fine for a few laps. Drove me crazy for a long time. Turned back ignition
,problem went away and never happened again. Same thing happened on my
buddies
MGB racer.




-----Original Message-----
From: Duncan Charlton <duncan.charlton54 at gmail.com>
To: fot at autox.team.net
Sent: Wed, May 25, 2011 4:24 pm
Subject: Re: [Fot] Sputtering TR question


I'm getting some well-thought out suggestions.  Thanks to Michael P, Bob K,
im M, Jim G, Tony (TR4 Tony), Russ M, Irv K, Scott B, Chris, and Bill B.
My thoughts that it was fuel related seem to be supported by the fact that
ost of you mentioned fuel issues.  So far:
. Bowl vents clear?  Hmm -- we do have mud dauber wasps around here!
. Fuel foaming due to vibration? (X2)  Possible, and perhaps the new
manifold
race could add more vibration.
. Sticky float or float needles?
. Leaky floats?
. Resonance due to new brace causing jets to sink down? (They're supported
by
 spring, but it makes sense that resonance could cause the spring to lose
ension temporarily, the way a spring governor on a lawnmower engine does)
. Needle(s) not properly seated in piston(s)?
. Advance profile poor or advance mechanism sticking?
. Loose engine ground cable?
. Improper jetting for driving style?  (Perhaps, but this didn't happen at
WS and seemed to get progressively worse at ECR even as I tried to prevent
he problem by braking later and sometimes holding throttle pressure while
raking)
0. Bowl lids (ie: float hinge point) oriented improperly)?  No -- this one
as been checked.  The suggestion came from someone who was also asking
hether it happened more when turning one direction and not another --
irection did not matter.
1. Dirt in carb? (X2) Fuel filter was clear when checked on Saturday but I
aven't looked in the float bowls yet.  I'll blow the lines back to the fuel
ell (no rust seen in fuel cell when I cleaned it out a few months ago --
ound silicone worm scraps, though)
2. Oiling plugs?
3. Intake tract leak?
The suggestions will guide my investigation -- thanks, everyone!
Duncan
52 Morgan red #6
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