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Originally Posted by zefarelly
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I think 100 per litre is a good mark fior historic spec engines I'm reasonably happy with a bit less and plenty of torque . . .although I'm just starting a new engine which may be a bit nuttier !
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I'm up the conservative end with Zef on this one for 2 reasons. First, there is a graph of a Wilcox 1800 crossflow fitted with an A9 cam in the Piper catalog. They don't normally understate things, that shows 174bhp & such an engine is likely to cost a 5 figure sum new. Second, take a peek at the figures here (pre-xflows, twincams & BDs):
http://www.race-cars.com/utility/coswrthr.htm
Sure it's as inaccurate as any other source, but I feel it hasn't suffered from inflation as much as some and there not a right lot over 100bhp/litre there.
Obviously it's much easier to get the bhp/litre on the smaller xflows as you can get the same huge valves in the small ones as you can in the big ones and you are asking the gas to do a lot less with lower piston speeds for equivalent revs & less volume to fill.
I too have seen the advert for the "200bhp xflow" but suspect they may be talking old-fashioned gross SAE
