good question, is it worth it to lighten the flywheel and what consequences
might I face. How much should it be lightened?
Patrick Bowen - wondering minds want to know.
-----Original Message-----
From: James Carpenter
[mailto:james.carpenter@jccsystems.swinternet.co.uk]
Sent: Monday, May 31, 1999 6:37 PM
To: Spitfire List
Subject: Fly wheel
Have you ever noticed how the acceleration (kick in the back) the same as
second, if not better in second.
If I am doing 2500 rpm in 1st, and descide instead of going chainging into
second to flaw the accelerator untill 5000rpm, the proformance and kick is
realy poor. Try it in second and you get a much better kick.
Strange and seems to defy all laws of physics. Except that the flywheel
saps loads of energy to spinup, so it takes a predefined time to spin up the
unloaded engin. This is added to the spin up time of the car for all the
gears.
The net result is that you find the spin up for first and second almost the
same, but second covers more MPH. And so the acceleration can be better in
second, even though ist give you more hill pulling power.
Anyway I wan't a lighter flywheel to give me a more peppy responce. I
currently have a Doly 1500 engin in my car, with Spitfire carburetters. Is
a Spitfire 1500 flywheel lighter than the dolly. I also have a Herold 13/60
GK block (for sale) is the flywheel for this lighter than the Doly 1500 or
Spitfire 1500.
OK it's been 2000 miles since a complete bottom end overhaull, and I don't
want to take the engin apart again to do any work on it. Can I take the
flywheel off the crank and have it balanced and lightened without doing
anything to the crank. Or do I need to give the engenering works the whole
lot?
How much can be taken off before it starts to effect the tickover i.e. you
have to raise it above 800 rpm.
It seem to me this is a very effective, and invisible way of tuning an
engin, giving better fule economy, not brakeing any emmissons laws, and a
smoother running engin.
How much does it cost in the UK?
James
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