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Join Date: Jun 2003
Location: Camarillo, Ca.
Posts: 2,291
Grady, from what I have read the peak cylinder pressure should be in between 17 to 20 degrees atdc. If detonation occurs the pressure starts advancing towards tdc and if it is bad enough btdc. With single plug I suspect that cylinder pressures are higher at tdc or right before because of the 36 degrees that it requires to achieve the peak cylinder pressures at the17 to 20 deg. atdc. Those higher tdc pressures set off the detonation. I would also suspect that with twin plug and higher compression you would see less tdc pressures than with single plug and lower compression.
Its always apleasure talking with you, let me know if I am full of poo.

Aaron. F.S. 1965 Solex engine w carbs/cleaner
Burnham Performance
1071 Avenida Acaso suite D Camarillo, Ca.805-240-6931
Old 08-01-2004, 11:29 AM
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