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Henry Schmidt's Avatar
 
Join Date: Apr 2004
Location: Fallbrook, Ca. 92028
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There are no secrets

If you know someone keeping secrets about rebuilding 911 engines he's fooling himself.

Yes, we use ARP rod bolts when we use stock 3.2, 3.3 and 3.6 rods.

The cylinders have the wrong stud spacing so that must be changed, the spigot size needs the be changed (105mm) and you need to run a base spacer.
If you use late style cylinders you also have to machine the heads. The case has to be cut to 105 to fit 100mm cylinders.
That's it.
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Old 06-04-2004, 10:26 AM
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Re: There are no secrets

Quote:
Originally posted by Henry Schmidt
If you know someone keeping secrets about rebuilding 911 engines he's fooling himself.
Thanks for being so forthcoming, Henry. I just didn't want to "wear out our welcome".
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Andy
Old 06-04-2004, 10:50 AM
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one more question

How do you change the stud spacing? Do you change the case or machine new through holes (slots?) in the cylinders?
Old 06-04-2004, 12:15 PM
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If you change the case you will have to change the heads. Just slot the cylinder holes unless 3.6 heads sound good to you.
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Old 06-04-2004, 12:33 PM
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If you change the case you will have to change the heads. Just slot the cylinder holes unless 3.6 heads sound good to you.
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Henry Schmidt
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Old 06-04-2004, 01:14 PM
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Henry, do you use any type of gasket or just aluminum to aluminum when sealing the heads to the cylinders?
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Old 07-21-2004, 04:23 AM
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Quote:
Originally posted by dbanazek
[B.... do you use any type of gasket or just aluminum to aluminum when sealing the heads to the cylinders? [/B]
There are some cylinders that use gaskets to seal to the head. I have thought about using a high tech epoxy to seal a hi pro turbo (800hp+) but decided against it. I got the idea from a 4 valve water cooled 956 cylinder/ head combination. They are welded together to prevent any leakage.
We have also used custom copper rings in place of gaskets under very high stress situations.
So to answer your question, cylinders that use gaskets, get gaskets.
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Old 07-21-2004, 09:48 AM
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I had an iron sleeved 2.8 based on a 3.0 case. At first I did not use any gasket. It seemed to seal the Aluminum to Aluminum but not at the iron to Aluminum. I tried a custom 1mm copper gasket but that seemed to be the same issue.

I have some early 964 clyinders that I have had modified to work on a 3.0 case to build a 12:1 race motor.

I was just going to bolt them up with no gasket and see what happens but if you have some experience....

Thanks
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Old 07-21-2004, 10:08 AM
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