Steve
You should check your ignition advance curve which is very simple
if you have a dial back timing light. You can probably add in some more
initial timing with out any problem. Lower compression engines can take
more advance.
Another possibility is you are running too rich off the line but is
very strong through mid-range and top end. The carb accelerator pump or
power valve maybe adding too much fuel off the line.
I have been told that 87 octane burns hotter than the premium
gasolines. I'm not a chemist so I will have to take their word on that.
For that reason I put premium in my stock 88 Mustang when I run at Watkins
Glen Race Track, in hopes that it will let the engine run a little cooler at
Wide Open Throttle.
Ron Fraser
-----Original Message-----
From: owner-tigers@autox.team.net [mailto:owner-tigers@autox.team.net] On
Behalf Of Sage
Sent: Wednesday, December 10, 2003 10:03 PM
To: tigers@autox.team.net
Subject: All Gassed Up
OK. My "new" 302 heads are installed on the Tiger, replacing the 289
heads with the blown head gasket. No more smoking, no more mysterious
loss of coolant.
Initial off the line acceleration is probably a fraction slower with the
lower compression 302 heads, but in the midrange it feels about as
strong as before. The real improvement is at the top end. No more
pinging. The 289 now revs way past 6,000 RPM and feels strong all the
way up the curve. With the old heads it ran out of juice around 5500
RPM, if it didn't start pinging badly before that.
With the lower compression, I am told I can run regular 87 octane gas
rather than the 91 I've always used in a Tiger. I'm on my first tank of
87. Still no pinging, but compared to running with premium in the
previous tank with the new heads, the Tiger does not seem as responsive
as with the previous tank of premium. Is this my imagination, or could
the lower octane gas result in slower acceleration?
Steve Sage
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