Calling all experts!! Algorithm for 2.7L race motor to attain 300HP??

[afterburn 549]

Did anyone mention turbo and a aluminum case ? there many pouting out that hp...don't know if that will fit your application

[kenikh]

Originally Posted by HawgRyder

And here I am rebuilding my 2.0L "S" with perhaps 90mm barrels, using an aluminum case and very large oil pump (got it off Ebay about 4 yrs ago).
The original idea was to build something with less compression so I could use lower octane gas.
I have been told, if I just use the 90mm barrels, without decking the cylinders or the heads, I will drop about 1 1/2 points on the C/R.
I have looked at the sets of 90mm barrels, and I notice that they have a groove at the top for a sealing ring?? perhaps.
Henry..can I use my S heads on these barrels...or am I now looking for heads as well?
Bob

Bob, tell me you aren't drilling a real 'S' case for 90mm P/Cs. I realize that we build these cars for ourselves, but doing the un-undoable on a rare and valuable case should give you pause.

FWIW, you will have to machine the sealing surface of your 'S' heads to get them to mate properly to 90mm cylinders which were designed for the later (flatter) head plus chamfer the inner edge of the combustion chamber for the larger pistons. It just leads to more undoable hackery of rare and valuable parts.

Do what I am doing: build a new motor from less rare parts.

[kenikh]

If your ally case is not an 'S' case, have at it! My comments on hacking the heads stand though. I used a set of '69S heads that were chamfered in the '80s to build my latest motor. They were functionally useless since no one wanted them anymore (and the fact they now required custom pistons). If your heads are already monkeyed with, then there is no guilt in doing this.

BTW, I have a very nice set of twin plug, ported, later heads and 90mm P/Cs with 10.5:1 CR pistons (on a 70.4mm crank). The CR would be about 9:1 on a 66mm crank for a 2.5 short stroke motor. They will be posted for sale here in the upcoming weeks (after I clean them).

[JV911SYDNEY]

Originally Posted by Henry Schmidt

Pictures? You want pictures? You can't handle these pictures!
oops, channelling Jack again

I just got a woodie

[Porsche-O-Phile]

Woodie nothing - I think I need a kleenex. . .

I'd love to do a 3.6L conversion, but I suspect it'd be about 15-20 grand by the time all was said and done. . .

Maybe when I find that elusive winning lottery ticket.

[kenikh]

One more thought on a 300HP 2.7 w/o using an early turbo case. You could use an early aluminum case, 66mm crank, have some custom Nickies made with thin skirts, bore your case accordingly and use custom 92.5 mm JEs...voila, 2.7SS. You would then have the displacement and short stroke to get the revs up for 300HP (with RSR cams).

Expect at least one child to miss out on college for building this motor.