Piston Difference
08-09-2011, 06:52 PM
#1
Rennlist Member
Thread Starter
Piston Difference
What, if any, is the use of the holes on each side of the wrist pin on my factory piston? The replacement piston I got doesn't have them. They are both the same tolerance group.
Do I need to get a piston with these holes or just make sure they weigh the same?
Do I need to get a piston with these holes or just make sure they weigh the same?
08-09-2011, 08:44 PM
#2
Former Sponsor
Porsche found that oil was getting trapped in the pin area and having a tough time returning, past the "full lower skirt".
There was a technical bulletin about drilling the holes. #8806. Book "E". page 39.
There was a technical bulletin about drilling the holes. #8806. Book "E". page 39.
08-09-2011, 09:15 PM
#3
Rennlist Member
Thread Starter
holes
So I'll take the new piston to the shop that did my heads and tell them to drill it out and make it look like my old one and call it good?
08-09-2011, 09:20 PM
#4
Team Owner
weigh the piston before you drill as well as after so you can compare the weights so it will match your old one
08-09-2011, 10:16 PM
#5
Rennlist Member
Thread Starter
The new (used) replacement piston is 4 grams heavier than the old piston. I bet the difference is in the holes.
08-09-2011, 11:28 PM
#6
Former Sponsor
08-09-2011, 11:30 PM
#7
Former Sponsor
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the holes will probably do it.
08-10-2011, 08:40 AM
#9
Rennlist Member
Thread Starter
My TSB's start at "F" as in "FVCK, why don't I have E!" Calling out to Rob Edwards, or anyone for a scan of the TSB #8806 Book E that they could email to me at jspahn@mac.com
