Paul, I agree that if it runs better if you pull the choke, you need a richer
mixture at that
location on the metering needle (wherever that is....).
As for the spring, well, you need a firm enough to give a nicely running
engine. It would appear that the exact
spring force is not all that critical but..... Remember, a firmer spring
causes the piston to offer more inlet obstruction
for the same manifold vacuum. For performance, you want minimum inlet
obstruction....
To summarize briefly:
Take the dampers out and insert a stick into the top of the piston. Gradually
rev up the engine until the misfire
occurs. Measure how far the piston has risen (off idle). This will be the
measurement on the needle that needs to
be narrower than the current needle. Look for a needle that neets your
specification.
Now, if you have a problem during momentary acceleration with the dampers in,
try a thicker oil in the piston.
You probably know all this, though....
-Tony
Message text written by INTERNET:owner-triumphs-digest@autox.team.net
>From: Paul Tegler <ptegler@cablespeed.com>
Subject: new engine 'feeling' needs richer accel mixture
Anyone know the 'rich/lean' change needed
when going from 7.5:1 to 9:1 compression?
Whitey ran GREAT on the dual HS4's with ABT needles.
With nothing different accept new flattop pistons,
it really feels like it needs to be much richer
on hard accel...(pulling the choke out a bit
on hard acceleration proves this)
QUESTION....
This would be springs in the dashpot right?
With a slightly richer taper on the needle right?
Paul Tegler
ptegler@cablespeed.com
www.teglerizer.com
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