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Join Date: Aug 2005
Location: san francisco
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Lower compression for Supercharger?

I have a stock 3.6 that I was thinking of supercharging. I'd want to cross drill the crank and upgrade the rods/bolts but was wondering if you could leave the compression ratio the same. I'm guessing you wouldn't seeing that these engines are already high.

Anyone have any knowledge on this?


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Craig Backer
Old 02-01-2007, 02:44 PM
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Depends how much boost you want to run. You can get away with 0.4-0.45bar on the stock C/R with intercooling and the appropriate changes to fuel & ignition timing. Any more boost and you have to decompress the motor.

You wouldn't have to upgrade the rods... they are the same as the Carrera/930 turbo rods. Just upgrade the fasteners.

Common practise for the 964 motor is to machine down the crown of the pistons, since they have a lot of "meat" on them. You can get them down enough to run ~8.5:1 C/R and run 1.0+ bar
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Old 02-01-2007, 02:52 PM
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What kind of bhp are we looking at for a tight 964 3.6 with 8.5:1 cr at 1 bar using a whipple type supercharger?

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Craig Backer
Old 02-01-2007, 03:53 PM
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Sorry, that should be 8.25:1 C/R

Not sure, but you're looking at about 560+HP with a turbocharged setup, but with a SC it'd be less due to the extra parasitic losses of the SC.

964 pistons can be shaved down to within .100" of the deck. It's a common mod, for aftermarket forced induction for the 964
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Merv
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition

Last edited by WydRyd; 02-01-2007 at 04:10 PM..
Old 02-01-2007, 04:06 PM
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