[Diy_efi] Spark Plug readings

[Eric Fahlgren]

r71chevy at earthlink.net wrote:
> 
> I thought it reduced the CR.  My understanding was that it would quench
> combustion & effectivly reduce the likelyhood of detonation, therefore
> reducing the CR & HP.  Maybe I have it backwards?

Those big, fat hydrocarbon chains in oil act as a very effective octane
reducer, since they are so easy to light.  This causes oil in the mixture
to effectively "raise the CR," at least wrt detonation.

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