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I'm curious about the option proposed by soupbone as well.
Chris
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Chris https://dergarage.com ‘07 GT3, '80 SC Weissach (For SALE), '01 986S, '11 958S, '18 Stelvio, '18 Dursoduro 900 |
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Try not, Do or Do not
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Knife edging would do little or nothing as would lightening.
With out counter weights it becomes very difficult the balance this big lump of *****. Best bet. Don't build an engine with a 964 crank and try to spin it.
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Henry Schmidt SUPERTEC PERFORMANCE Ph: 760-728-3062 Email: supertec1@earthlink.net |
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Does the 993 or GT3 76.4mm crank have counter weights or the same? What are the alternatives for this case if one wanted to spin it?
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Henry, Appreciate the feedback. What is the safe limit for long life with the 964, 7K RPM?
Chris
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Chris https://dergarage.com ‘07 GT3, '80 SC Weissach (For SALE), '01 986S, '11 958S, '18 Stelvio, '18 Dursoduro 900 |
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Forum:
1. What does Porsche say about this? 2. Do you have links discussing other 964 problems? Henry: thanks for the empirical evidence, as a picture is worth a thousand words. Regards,
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Bernard |
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Out of curiosity, could a disimilar metal case through bolt cause this during uneven temperatures at cool down/ heat up. It would seem that if you put enough compressive force on those webs from disimilar metal temps with different strains, then add some vibration from the crank into the fire, and assuming the case through bolts are very strong it could indeed have enough magnitude to crack.
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2007 Mazda 3 hatch 1972 Porsche 914 roller with plenty of holes to fix ![]() Last edited by 1fastredsc; 02-22-2006 at 04:15 PM.. |
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Quote:
Something to think about is the fact that with the 964/993 cases, the case through-bolt torque spec. was inreased by about 10 lb./ft. (so was the head nut torque)
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'69 911E coupe' RSR clone-in-progress (retired 911-Spec racer) '72 911T Targa MFI 2.4E spec(Formerly "Scruffy") 2004 GT3 |
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correct me if I'm wrong, but isn't the 964 crank used in the 993 RSR & GT-2?? NOT the 993 crank?
Do those engines run harmonic balancers? Sorry, I don't have any empirical experience to add. AND I appreciate Henry's free advice and input (along with other professionals.) Henry's experience and base of knowledge is notable. Thank you, Doug
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1971 RSR - interpretation |
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Quote:
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2007 Mazda 3 hatch 1972 Porsche 914 roller with plenty of holes to fix ![]() |
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Exactly. Clearly the two are related, but I wonder which is the cause of the cracks. Maybe both contribute.
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'69 911E coupe' RSR clone-in-progress (retired 911-Spec racer) '72 911T Targa MFI 2.4E spec(Formerly "Scruffy") 2004 GT3 |
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