Mike:
My '74-1/2 has a 13 degree dizzy advance, which translates to 26
degrees crank
advance. That, plus my 12 BTDC static setting means that I get 38
degrees total
advance. Most engines like around 35 degrees total advance for maximum
power, perhaps
a tad more in some cases (According to D. Vizard, my hero).
I mention this only to point out that for my motor, I am not
getting any knocking
on regular gas. My engine is running 9.6:1 with a 270 degree cam, and it
"seems"
satisfactory. So don't be afraid to try more advance if you wish.
By the way, the Bentley manual is very confusing on one point:
The dynamic timing
of 4 ATDC is with the retard CONNECTED and working. The manual is very
misleading on this
point, and if you follow the instructions literally you will end up with
the timing waaay
off. Ask me how I know...
Cheers,
Vance
P.S. I posted a dyno simulation on my web site of my modified
TR6 motor. Not sure
I believe it, but the numbers look great!
------------------------------
Cogito Ergo Zoom
(I think, therefore I go fast)
TR6 Web page: http://home.comcast.net/~v.navarrette/
-----Original Message-----
From: owner-6pack@autox.team.net [mailto:owner-6pack@autox.team.net] On
Behalf Of DaCRANEz@aol.com
Sent: Sunday, November 28, 2004 9:19 PM
To: trguy@cfl.rr.com; 6pack@autox.team.net
Subject: Re: Dizzy Question
The 41352 model was specific to the 1971 model year. I has a different
advance curve than your earlier unit. The static timing for the 41202
is 12 deg
BTDC and for the 41352 is 4 deg BTDC. They both call for dynamic timing
of 4 deg
ATDC with vacuum retard blocked. The big difference is in the cetrifigal
advance curves. At 3000 rpm the maximum advance on the 41202 is 22 deg
at the
crank versus 30 degrees for 41352. You may run into an over advance
problem with
the 41352. Others may be able to elabotate more on this subject. I
know that
Berry Price sleeved his posts to limit advance. There is much detailed
info
in the Bentley Manual-pp.511 thru 517.Hope this helps.
Mike C '71 TR6
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