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Railcarmover · 10-23-2019, 08:02 AM

Improper timing leads to detonation,high compression is not as tolerant of manual spark control as stock is. Detonation or spark knock is one of the leading causes of bearing failure,that knock is like a sledgehammer to the top of the piston.

If you install a high performance head for better performance wouldn't you want automatic,accurate timing at any rpm to make the most of it?.1 degree of advance for each 100 rpm up,and down,is impossible to achieve by 'feel'..so you set it at 9 o'clock for instance..at one part of the engine acceleration its too far advanced,the other its retarded. But if your running a stock Zenith carb it really doesn't matter,you're not getting the fuel the engine can handle to begin with.Performance lies with balanced air flow,air in,through and out of the engine,You are providing more efficient combustion with higher compression but not utilizing its full benefit by fixed timing and using a carb that flows half the CFM of the engines capacity.

10-23-2019, 08:02 AM	#19
Railcarmover BANNED Join Date: Apr 2017 Location: Sacramento Posts: 1,262	Re: Hi compression head and stock ignition Improper timing leads to detonation,high compression is not as tolerant of manual spark control as stock is. Detonation or spark knock is one of the leading causes of bearing failure,that knock is like a sledgehammer to the top of the piston. If you install a high performance head for better performance wouldn't you want automatic,accurate timing at any rpm to make the most of it?.1 degree of advance for each 100 rpm up,and down,is impossible to achieve by 'feel'..so you set it at 9 o'clock for instance..at one part of the engine acceleration its too far advanced,the other its retarded. But if your running a stock Zenith carb it really doesn't matter,you're not getting the fuel the engine can handle to begin with.Performance lies with balanced air flow,air in,through and out of the engine,You are providing more efficient combustion with higher compression but not utilizing its full benefit by fixed timing and using a carb that flows half the CFM of the engines capacity.