[Fot] Weber tuning help please

[Jim Gray]

Bill,

You were right but I don't have a good solution at the moment. Only # 3
reacted to the carb cleaner and that suprises me a bit.

I have the thick remflex gaskets in there. One side of the intake manifold
on # 3 had barely any contact with the gasket.

The remflex and the Moss gaskets have 1-11/16" inside diameter openings at
the intakes. My cannon manifolds are 1-7/16"

and the cannon's don't have a lot of meat for bearing surface around the
lower area's around 5 o'clock and 7 o'clock.

As best I can tell though it was actually leaking on # 3 at 3 o'clock right
next to the clamp bolt.

I could actually look next to the clamp bolt and see where the gap was.

I need to either find different gaskets with a smaller ID or make my own.

Have you, or anybody had success at making their own intake/exhaust gaskets
from regular gasket material ?

jim

 

 

 

  _____  

From: Bill Babcock [mailto:Bill at ponostyle.com] 
Sent: Sunday, May 03, 2015 1:21 PM
To: Jim Gray
Cc: fot at autox.team.net
Subject: Re: [Fot] Weber tuning help please

 

Sounds like an air leak somewhere. Perhaps it gets overcome at full throttle
or is worsened at those specific RPMs because of harmonics in the vibration
of the carb. Might be a crack or flaw in the carb, but more likely it's in
the mounting, either O rings or some other flaw. They can be hard to detect
and locate. You could use the carb cleaner method-spray a little at each
joint or suspect area and listen for changes in engine sound. I've used the
ultrasonic detector I use for finding leaks in surfboards to some effect, a
leak sounds like a calliope, but there's a lot of other noise to sort it
from. 

 

On May 3, 2015, at 8:40 AM, Jim Gray via Fot <fot at autox.team.net> wrote:

 

I just installed my webers and I'm running into something not covered in
anything I've read so far.

At cruise speed which I do on the street, 2500  -3000 RPM my exhaust gas
temps on # 4  are 100 plus degrees

over # 1and will climb to 1400 if I stay at that throttle setting. Under
wide open throttle they equalize and seem

to settle in at about 1300.

However, I think this may be symptomatic of my other issue. When I'm tuning
the idle air screws, open them up until

it starts to miss & so on, I can get a predictable stumble from three out of
the four screws.

The screw on # 3 has no effect on the idle no matter how far I run it in or
out.

Also , when I put my syncrometers on #'s 3 and 4 they are significantly
different.

I'm not going to get my dyno tune before the first race in two weeks so I'm
left to figure it out on my own for now.

Any help would be greatly appreciated,

Jim g

 

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Editor: Ponostyle

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