Quote:
Originally Posted by Jeff Higgins
Yeah, this would be better asked on the tech forum. But, since you asked...
I'll chime in against the 3.6 conversion for a couple of reasons. Number one, the torque of the 3.6 is a 915 killer. I've seen far too many 915's eaten up by 3.6's. Number two, the conversion is not as cheaply accomplished as some would think. Lots of things need to be altered or replaced altogether. There will be some clearance machine work required on the 915 bell housing, all of the engine tin is different, the wiring harness is completely different, and on and on. "The devil is in the details".
It would be far cheaper to to rebuild your current 3.0 into something with a bit more power, but power that is more "915 friendly". Go with 98mm P&C's and appropriate cams, like GE or DC 60's (and proper springs), maybe even bump the compression up to 10.5:1 and twin plug it. That would make for a very entertaining motor at about half the cost of a 3.6 conversion.
My own motor is much like that. I kept it at 3.0 liters, though. I'm running JE 10.5:1 pistons, Dougherty GT2-102 cams, and reworked MFI to run with that motor. Exhaust is SSI's and a Dansk RSR muffler. Ignition is Electromotive crank fire, twin plug. This combination made just under 220 hp and 215 ft lbs on a chassis dyno. My 2,200 pound '72 hot rod is a very fun car with this motor in it. Something similar to it would really wake up your SC, and you already have almost all of it already.
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I took my 914/6 with a tired engine that was already upgraded to 2.2l. I had originally planned a high compression 2.4 by changing the crank and rods (from Wayne, no less!). When it went into the shop, the P&Cs were too far gone. I found some RS spec 2.7 Nikasils, added in S cams, changed the webbers out to a set with more flow and ported the heads. We estimated 210hp. Anything more and the 901 would have been destroyed. It maxed out at 136, gearing/rev limited. In a 2000 lb car, 210 was fine!
To the OP, you might consider some Cams and a 3.2 displacement change and a Megasquirt system. If I hadn't sold my /6, I was going that path. Along with air conditioning...