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Join Date: Oct 2008
Location: Norway / Miami
Posts: 1,390
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97mm vs 98mm cylinders

Hi,

After my total engine damage, I am now soon ready to building my new engine.

Parts has been collected, new engine block + all internals.
Will continue with stroke with the 964 crank.

but still not sure on the route on cylinders.
Currently I had JBR 98mm cylinders with JE pistons, CR at 8:1. But need 2 new cylinders as they was damaged.

The cost for 2 new cylinders is expensive and then I could go for a new Mahle 98mm P/C kit - but still pricey.

I have several mahle 3.3 P/C sets, so wonder if I should use them.
They needs to be machined for flame ring, and probably taken some off the pistons to allow the GT2 cam profile.


Since I will use the 964 crank, I will still be able to get 8:1 and even more in CR.
Volume will then be at 3,35 and not 3.45 with the 98mm

On a turbocharged engine, how much will one notice the difference in 100ccm ?

Anyone that has compared before and after a dyno when only P/C has been changed?

__________________
Trond R.
1979 930: Garret GT35r turbo, EFI, carerra intake, Link EMS, custom GT2 cams, 98mm JE P/C, 964 crank (stroker), custom valves & ported (XtremeCylinderHeads) etc..etc..
1972 914-6 GT replica project
1986 944 Turbo
Old 02-09-2023, 03:58 AM
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