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Speed Junkie
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What are these doin in here??
Hey, I have a 89 930 with engine code 930/68. When I got to the pistons, I noticed that they are flat top Mahle pistons. Is this right?? Everything I've read and seen up to this point has had half dome shaped pistons. This concerns me since I have always thought the half domed piston design was inherent for proper combustion of the CIS fuel systems. Can anyone possibly help clear this up for me?
Thanks, 
Last edited by CreatuR; 09-26-2004 at 06:10 AM.. |
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09-26-2004, 06:07 AM
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I would rather be driving
Join Date: Apr 2000
Location: Austin, TX
Posts: 9,108
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I think the domed shape is only for NA engines. your turbo has lower compression and its not surprising to me to see flat top pistons.
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Jamie - I can explain it to you. But I can not understand it for you. 71 911T SWT - Sun and Fun Mobile 72 911T project car. "Minne" - A tangy version of tangerine #projectminne classicautowerks.com - EFI conversion parts and suspension setups. IG Classicautowerks |
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09-26-2004, 07:12 AM
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Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,428
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stock 930. notice the exhaust valve contact notch.
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09-26-2004, 08:13 AM
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Registered
Join Date: Apr 2002
Location: Cheraw, SC
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Brian Keith Smith |
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09-27-2004, 11:04 AM
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Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
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Low compression turbo pistons will be flat or less than flat.
Sherwood |
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09-27-2004, 05:07 PM
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Speed Junkie
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Quote:
I can't remember (forgive me, but I've been browsing the Porsche forums like a mad man for the past few weeks). Did you go to EFI on your build? |
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09-27-2004, 07:14 PM
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Registered
Join Date: Apr 2002
Location: Cheraw, SC
Posts: 811
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Yes, I went EFI. 431.8HP to the rear wheels and I am told there is more there with some more tuning on the computer.
Brian
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Brian Keith Smith |
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09-28-2004, 07:16 AM
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White Knuckle Ride
Ol' Timer
Frankenstien
