|
|
|
|
| Author |
|
|
Registered
Join Date: Mar 2011
Posts: 271
|
resurface 930 cylinder heads
Hello,
I tried another company for resurfacing a set of 930 3,3 cylinderheads. I wasn´t attented when I picked them up, but today when I start assembling the engine I saw that they only cut the inside, but not the outer head surface. I checked with a feeler gauge and there is no play. I used new cylinders and they are 2.7 mm. The high difference in the head is 2.7 till 2.85. poor job, I will for sure not use them again. But what are the numbers I should have? Sorry for my poor english. Attached is a picture. I hope that makes it easyer to understand me. The blue numbers are the high differences. And this is where I need the original porsche numbers. I cannot find them in any of my book... Many thanks in advance, Malte 
|
||
02-03-2017, 09:24 AM
|
|
|
abit off center
|
They didn't go the full .25mm it looks like. The original surface should be 84.50mm. Those could be cut again and cleaned up, just adjust with a .50mm base gasket or what ever it takes. And yes the outer surface should have been cut the same amount or it can hit the cylinder fins.
Min would be 84.25mm
__________________
______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. Last edited by cgarr; 02-03-2017 at 10:59 AM.. |
||
|
02-03-2017, 10:57 AM
|
|
|
Registered
Join Date: Mar 2011
Posts: 271
|
Thank you! I am pretty sure they just cut till the surface looked good and didn t kept any eye about how much they cut them. Do you know the factoy difference between the inner and the outer surface?
|
||
|
02-03-2017, 11:10 AM
|
|
|
abit off center
|
Every one I have measured is 2.50mm
__________________
______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. |
||
|
02-03-2017, 11:15 AM
|
|
|
Registered
Join Date: Mar 2011
Posts: 271
|
Thank you very much!!!
|
||
|
02-03-2017, 11:57 AM
|
|
|
Member 911 Anonymous
|
a Plug for Master CGarr,
My heads masterfully done by him:  Relax, have a CGarr, Head Machine/Rebuild Service Review Most importantly, properly marked for future reference.
__________________
'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 |
||
|
02-03-2017, 06:43 PM
|
|
|
|
Registered
Join Date: Mar 2011
Posts: 271
|
Great job!!! But a little far away from germany...
|
||
|
02-03-2017, 11:47 PM
|
|
|
Registered
Join Date: Feb 2013
Location: Essen, Germany
Posts: 192
|
Germany
Quote:
Best reg. Dirk https://www.facebook.com/edelweissmotorsport/ |
||
|
02-04-2017, 01:27 AM
|
|
|
Forced Induction Junkie
|
Quote:
Quote:
Would that same 2.50mm rule of thumb apply to the C2 Turbo heads that use a head gasket?
__________________
Dave '85 930 Factory Special Wishes Flachbau Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P |
||
|
02-04-2017, 03:42 PM
|
|
|
Registered
Join Date: Mar 2011
Posts: 271
|
Dirk, I ´ll give you a call this week.
Thanks, Malte |
||
|
02-05-2017, 10:15 PM
|
|
|
Registered
Join Date: Jan 2010
Location: Miami, FL
Posts: 79
|
I had very good experiences with weil-motorentechnik.de
Give him a call. He is very knowledgeable and friendly. Good luck, Alex |
||
|
02-06-2017, 07:34 AM
|
|
1969 and 1986 Porsche Targa and Coupe 1720cc and 3
Marble Grey
1985 Porsche 930 Fac. Slantnose 3.3l
