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Registered User
Join Date: Jan 2011
Posts: 17
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88 3.2 rebuild 964 cam reground
I have the stock cam reground to 964 spec. everything stock( pistons, valves & etc) Do I need to change the copper seal to .50 mm cylinder to engine case..
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04-01-2017, 07:51 AM
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Member 911 Anonymous
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No, only if you cut the heads and/or the case cylinder decks. STD ( standard ) 0.25MM gasket will be just fine. But just for insurance, measure the piston to cylinder deck height.
964 profile cams have no effect on deck height.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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04-01-2017, 07:58 AM
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Registered User
Join Date: Jan 2011
Posts: 17
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Thanks Bro!
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04-01-2017, 08:05 AM
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Member 911 Anonymous
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One Caveat, you may need to ignore the base idle settings all together and adjust the idle manually to insure it does not sub-dip with those new aggressive cams. Do this after she is warmed up.
Here is my thread on my 964 Cam install: 964 Cams Swap Journey Timing is the same, ideal 1.25MM ( 1.1-1.4 ) Break a Leg Brother  and enjoy, you will be pretty stoked with those
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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04-01-2017, 08:15 AM
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Registered
Join Date: Jul 2006
Location: S. Florida
Posts: 7,249
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My 930 heads were machined down .017" and I used new .25mm base gaskets with blue hylomar non hardening sealant smeared on them and 964 cams timed at 1.26mm. There are no problems with valve to piston clearance and it runs great.
Has anyone ever installed the cylinders with no base gaskets and just hondabond or yamabond (both are rebranded threebond) for a free compression bump? I guess there would be a good chance of oil leakage there if you did that. |
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04-01-2017, 08:40 AM
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Member 911 Anonymous
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Interesting, if case cylinders decks are confirmed straight, it should not leak. Ollie's Machine Shop said some of their client opt not to re-deck the case at cylinder and even with new gaskets and seal additive, it leaked. I opted to re-deck, it was off by 3 thou
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC Last edited by DRACO A5OG; 04-06-2017 at 08:49 PM.. |
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04-01-2017, 08:43 AM
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Registered
Join Date: Mar 2005
Location: Northern CA
Posts: 4,703
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I had my cams ground to 964 using CamGrinder. I didn't do anything - no issues other than seems like a bit more power on the high end.
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Sold: 1989 3.2 coupe, 112k miles |
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04-06-2017, 12:30 PM
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Marble Grey
