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Registered
Join Date: Jan 2004
Location: Spain
Posts: 62
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Carrera USA/EURO
What is different?
I know that compression USA is 9.5:1 and Euro is 10.3:1 Where is difference? -crankshaft -rods -cylinder -piston -head Thanks |
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Moderator
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If you ar asking about '84-89 3.2 Carrera, the diffference is in the pistons/cylinders, exhaust and DME parameters.
All the Euro 930/20 or /26 w/ 10.3cr used forged Mahle pistons w/ Nickasil cylinders, the 9.5cr 930/21 or /25 used either forged Mahle or cast Kobelschmit Alusil the 930/20 has a pre-muffler the others a cat
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Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | |
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Registered
Join Date: Jan 2004
Location: Spain
Posts: 62
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Well ,but why the reference cylinders in PET is the same for 930/20/21/26?
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Moderator
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They may be physically interchangeable as sets but the fact of the matter remains, at original assembly the 231hp 903/20s all got forged Mahle 10.3 w/ Nikasil cylinders, all the others got either 9.5 forged Mahle/Nikasil or cast KS/Alusil. Which you got was hit or miss w/ the purported preponderance of KS going to US cars
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Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | |
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Registered
Join Date: Jan 2004
Location: Spain
Posts: 62
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Quote:
There must be any difference in height piston or cylinder,and reference is de same in PET ![]() ![]() ![]() |
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Moderator
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Quote:
and the 9.5 pistons can be either forged Mahle(w/ A lower piston top to give less compression) or KS cast. The former will have Nikasil cylinders and the latter will have Alusil. I don't understand what is so confusing about that. for the Mahles there were 4 different weight classes for 930/20/25/26 and 4 more for 930/21 for the KS there were 4 more different weight classes only used on 930/21 on the production line the spec is to have all pistons w/i 4 g, for service afterthe fact the spec is to be w/i 8g
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Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | |
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Warren Hall Student
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Quote:
If you wish to change the compression just make sure that you match Mahle pistons to Mahle cylinders or KS to KS. They can't be interchanged between the two brands.
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Bobby _____In memoriam_____ Warren Hall 1950 - 2008 _____"Early_S_Man"_____ Last edited by Bobboloo; 09-19-2008 at 09:57 PM.. |
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