Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > 1- Porsche Technical Forums > 911 Engine Rebuilding Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Speed Junkie
 
Join Date: Jul 2004
Location: MI
Posts: 104
Garage
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..
Old 09-26-2004, 06:07 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
I would rather be driving
 
jpnovak's Avatar
 
Join Date: Apr 2000
Location: Austin, TX
Posts: 7,322
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.
__________________
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
classicautowerks.com - EFI conversion parts
Old 09-26-2004, 07:12 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered User
 
john walker's workshop's Avatar
 
Join Date: Mar 2001
Location: seattle wa usa 206.789.6800
Posts: 17,266
stock 930. notice the exhaust valve contact notch.
__________________
jwworkshop@aol.com 206 789 6800
7613 greenwood ave n seattle wa 98103
Old 09-26-2004, 08:13 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Registered User
 
Join Date: Apr 2002
Location: Concord, NC
Posts: 810
Check out my rebuild pics, yes you have the right pistons in there.

Brian
Engine Rebuild Pics
__________________
Brian Keith Smith
Competition Custom Paint
1983 930
My Track Videos
TEC3 EFI Conversion on 1983 930
Old 09-27-2004, 11:04 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered User
 
Join Date: Jul 2000
Location: So. Calif.
Posts: 18,191
Low compression turbo pistons will be flat or less than flat.

Sherwood
Old 09-27-2004, 05:07 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Speed Junkie
 
Join Date: Jul 2004
Location: MI
Posts: 104
Garage
Quote:
Originally posted by briankeithsmith
Check out my rebuild pics, yes you have the right pistons in there.

Brian
Engine Rebuild Pics
Brian,

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?
Old 09-27-2004, 07:14 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
Registered User
 
Join Date: Apr 2002
Location: Concord, NC
Posts: 810
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
__________________
Brian Keith Smith
Competition Custom Paint
1983 930
My Track Videos
TEC3 EFI Conversion on 1983 930
Old 09-28-2004, 07:16 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 08:01 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.