Alan, Stan:
I am coming to this discussion very late, but a data point is
that I run 9.6:1 CR, with a 270 degree cam on regular (87 octane R+M/2),
never the slightest hint of pinging.
I run the factory timing of 10BTDC static, 4ATDC dynamic with a
stock dizzy, 13 degrees of mechanical advance at the dizzy.
I have the later head with the smaller exhaust valve and I run
Zenith carbs with B1AR needles. The plugs are a nice grey brown color.
In short, no issues. YMMV.
Vance
Vance Navarrette
Cogito Ergo Zoom
I think, therefore I go fast
-----Original Message-----
From: 6pack-bounces+vance.navarrette=intel.com@autox.team.net
[mailto:6pack-bounces+vance.navarrette=intel.com@autox.team.net] On
Behalf Of Foster, Stan
Sent: Friday, June 13, 2008 8:09 PM
To: Alan Salvatore; triumphs@autox.team.net; 6pack
Subject: Re: [6pack] Compression boost
My understanding is that you can go at least as high as 9.5:1 or perhaps
9.6:1
and still be fine on regular gas. At least I hope so, I had my head and
block
machined for 9.6:1 based on that assumption. It would not ruin my whole
day if
I had use a higher octane however.
Stan
-----Original Message-----
From: 6pack-bounces+stan.foster=hp.com@autox.team.net
[mailto:6pack-bounces+stan.foster=hp.com@autox.team.net] On Behalf Of
Alan
Salvatore
Sent: Friday, June 13, 2008 10:56 PM
To: triumphs@autox.team.net; 6pack
Subject: [6pack] Compression boost
I am in the process of rebuilding my 76 motor.
I had it bored out 20 over and got a G2 cam, aluminum flywheel.
I couldn't decide what to do with the head. I just left it at the
machine
shop and am going to have it milled for
9 to 1 compression.
The nice thing about the 7.5 to 1 compression was that it ran on regular
gas.
Not to sure what effect the 9 to 1 will have on gas requirement;
or if I just should have bumped the compression even higher.
Al
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