If the car does not already have a heat shield between the exhaust manifold
and carb, I would start by installing one. Those things are easy to
construct from sheet aluminum and are very effective at preventing the heat
from the exhaust from boiling the fuel in the float bowl.
Hopefully that will solve your problem.
Joe
-----Original Message-----
From: spitfires-bounces@autox.team.net
[mailto:spitfires-bounces@autox.team.net] On Behalf Of Greg Stull
Sent: Wednesday, July 21, 2010 4:22 AM
To: Spitfire Group
Subject: [Spits] Sputtering when hot above 50 mph
Sent this last night but I didn't know if it went through, I didn't see it.
Sorry if you received it twice.
Thanks guys,
I drove it last night and ran great. Had it up to 60 mph for about 20 miles.
Temperature was in the lower 70's. Maybe I didn't drive it long enough. When
I
have trouble is when the temperature is in the 90's.
Let me ask another question, could oil make the car run hotter. I did an oil
change and used Auto Zone brand oil. I usually use Valvoline oil. I still
used
20 W 50 like I always use. Just trying to think of things I did since
problem
started.
Also what is the reason for the spacer on the fuel pump? I heard two
different
reasons. One is that it makes the fuel pump run a little cooler and the
other
is you can use a fuel pump from a different model car (like a Chevy) that's
more common.
I'm going to put a 160 degree thermostat in to see if that helps. Also going
to put a new fuel pump on but I can't understand why it only does it on a
hot
day. Unless the fuel pump acts up when it gets hot?
Matt, you wouldn't happen to be going to the Vintage Grand Prix at
Pittsburgh
this weekend? I'll be there on Saturday but as of right now I wouldn't be
driving my Spitfire there.
Greg
1978 Spitfire 1500
Ohio
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