09-23-2009, 08:30 PM
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Senior Club Cobra Member
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Join Date: Jul 2002
Cobra Make, Engine:
Posts: 15,712
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Not Ranked
Old motor:
12.5 to 1, with iron heads no less! When it knocked from low octane it sounded like Thor and his mighty hammer at work. 
I'd run the timing retarded, a bunch, to get by with pump gas and NEVER let the rpm fall to low and load the engine to much. Running race gas and advancing the timing really woke it up.
New motor:
At 9.6 to 1 now, still iron heads, with the proper timing I can pull nicely from about 17-1800 rpm. I can take off in third gear with no problems. 3rd gear is good for about 110-115 mph, by the way, it's TALL.
I do believe the "quench" built into this motor allows me to run a little more advanced timing than might other wise be recommended. Forged pistons, 7,000 miles later and so far, so good.
Last edited by Excaliber; 09-23-2009 at 08:35 PM..
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Hybrid Mode
