Re: W9 Distallate head

Posted by Joe Evans on December 12, 2005 at 14:32:53 from (67.129.216.191):

In Reply to: W9 Distallate head posted by Roger in Iowa on December 12, 2005 at 13:46:07:

I don't know for sure. (Seems I know nothing for sure nowadays!) However, it would stand to reason that a distillate head would have a lower compression ratio than a gasoline head.

Distillate has very poor anti-knock qualities therefore, it can't stand as a high of a compression ratio than gasoline. Heck, when the W-9 came out in 1940, gasoline itself wasn't all that great then, so the 335 gas engine had a CR of 5.4:1. Conversely, LP has good anti-knock qualities, and LP engines have typically higher CRs than their gas and distillate counterparts.

Many Nebraska tests show the LP versions of an engine besting a gasoline version in BHP.

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