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> Anybody Built a 10.5:1 Type 1 or 4 Engine?, Do they explode?
Series9
post Feb 9 2013, 10:15 PM
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I build 10.5:1 /6 engines pretty regularly. 93 octane and single plug. That's about the limit without going twin-plug, but all of them on the road have been fine.


Why don't I see this in Type 1 or Type 4 engines?

Some rough math suggests a 2.0 @ 8.5:1 is an 85hp engine, while the same engine at 10.5:1 would give almost 120hp.



Just thinking out loud..... (IMG:style_emoticons/default/beerchug.gif)
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messix
post Feb 10 2013, 12:29 AM
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i think it's more a question of what heads you use and the quench area design.

resistance to pre ignition and cooling the head along with a modern efi and timing would allow higher compression.

carbs and stand alone dizzy stock heads with street gas and 10.5 would prolly bang the motor apart and run pretty inefficiently.

valve seats and ring lands would not be happy.
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