OK Paul, sounds reasonable. Perhaps the assumption that advancing yields
higher heat is that over advancing _burns_ the piston and valve, while I've
not seen that happen over retarded?
Peter C
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At 07:10 PM 7/25/2000, Paul A. Asgeirsson wrote:
>OK All,
>
>I couldn't find my 40 plus year old notes taken from my Allen Tune Up
>course I took, (thought I saved everything!) so I went snooping on the
>internet.
>
>Found a pretty good explanation at several sites, so recapped it to below.
>
>Retarded timing will result in more heat transfer to the block as a result
>of the piston being closer to the bottom of the stroke instead of at a more
>advantageous angle where the can transmit maximum power to the crankshaft
>at the moment of maximum piston power. It will also allow more burning
>fuel out the exhaust chambers and into the manifold. The manifold can act
>as a heat sink, but when it turns cherry red it will be radiating heat to
>the underhood area.
>
>There are additional reasons, but these are the crux of them to explain
>higher heat transfer to the cooling system while running retarded.
>
>FWIW, Paul A
---Snip, whack, dump-------
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