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 > Porsche Forums > 911 Engine Rebuilding Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
Join Date: Sep 2004
Location: UK
Posts: 19
Unhappy choosing piston

Hi there,

I have a 1983 930 3.3L Porsche. Unfortunately i have fried 2 pistons. Therefor i am looking to get the piston change. There are few options that i can go for now. 1st is to replace them with the OEM piston. 2nd- to get after-market piston. and 3rd oversize-- 3.4 litre piston.
I am really interested to go for the 3rd option. But i am not sure which pistons are the best one to get... andial, ******** or JE (if they do one) and the right compression to go for. I am just looking for some good reliability and the ease to get them rebuilt.
Hope you guys,..expertises... can help me abit here...!! THANKS VERY MUCH ...!! and any other advise / tips given are greatly appreciated..!!!

REgards.
Ernest (Malaysia)
Old 02-22-2006, 06:18 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered User
 
Join Date: Jul 2001
Location: Portland Oregon
Posts: 6,992
Ernest:

If you are looking for reliability & longevity, then your best choice would be Mahle's; either stock 97mm or the 98mm (3.4 litre) ones. JE's and others do not come close in this regard.

I would NOT recommend a big boost in compression ratio (or boost pressure) unless you take measures to enrichen the fuel mixture.
__________________
Steve Weiner
Rennsport Systems
Portland Oregon
(503) 244-0990
porsche@rennsportsystems.com
www.rennsportsystems.com
Old 02-22-2006, 09:01 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered User
 
78P930's Avatar
 
Join Date: Dec 2005
Location: Austin TX
Posts: 565
Garage
Ernest,
In the interest of preventing others from doing the same hwo do you think you fried your pistons and what's your setup?

Thanks,
Pat
__________________
10 Ford Raptor
86 930
Old 02-22-2006, 01:29 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
resident samsquamch
 
sand_man's Avatar
 
Join Date: Oct 2005
Location: Cooterville, Cackalacky
Posts: 6,821
Quote:
Originally posted by 78P930
Ernest,
In the interest of preventing others from doing the same hwo do you think you fried your pistons and what's your setup?

Thanks,
Pat
I agree. What caused the failure? Too lean, ignition timing, age/mileage, too much boost (after market boost spring), etc., etc.
__________________
-jeff
back in the saddle: '95 993 - just another black C2
*SOLD*: '87 930 GP White - heroin would have been a cheaper addiction...
"Ladies and Gentlemen, from Boston Massachusetts, we are Morphine, at your service..." - Mark Sandman (RIP)
Old 02-22-2006, 01:34 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered User
 
78P930's Avatar
 
Join Date: Dec 2005
Location: Austin TX
Posts: 565
Garage
hwo=,how
__________________
10 Ford Raptor
86 930
Old 02-22-2006, 02:20 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Registered User
 
Join Date: Sep 2004
Location: UK
Posts: 19
Thanks guy. I dotn really know why exactly i fried the 2 piston. There are 2 obvious possibillity , 1st. My oil tank is too dirty (rust) and caused the car to run inadequate of fuel or 2nd. No engine oil .

I have the 1st problem since few months back and always have no chance to solve it. MY car will sometimes stop or cant rev up due to the lack of fuel. I have to then wash the fuel filter in order to make it work. Infact i really dont know what caused it to fail . vae you guys got any idea too ?

Thank guys, Steven where is the best place for me to get the 98 mm Mahle piston and does it require any modification to get it fitted and does it give significance power increase compaired to the original 3.3.

Thanks again everyone.

regards,
Ernest

Last edited by chucai; 02-22-2006 at 04:55 PM..
Old 02-22-2006, 04:50 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
resident samsquamch
 
sand_man's Avatar
 
Join Date: Oct 2005
Location: Cooterville, Cackalacky
Posts: 6,821
The Mahles are HELLA expensive, but it's good stuff! Before you end up dropping some serious $$$$ on them, you really need to find the culprit, or you'll be back in the same boat, only with your wallet close to US$4K lighter! Also, the 98mm are "bolt-on"...no other mods needed to make them fit in a 3.3.
__________________
-jeff
back in the saddle: '95 993 - just another black C2
*SOLD*: '87 930 GP White - heroin would have been a cheaper addiction...
"Ladies and Gentlemen, from Boston Massachusetts, we are Morphine, at your service..." - Mark Sandman (RIP)
Old 02-22-2006, 08:19 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
resident samsquamch
 
sand_man's Avatar
 
Join Date: Oct 2005
Location: Cooterville, Cackalacky
Posts: 6,821
One other thing, Ernest, what's the story on this engine? I mean are you just planning on dropping in new pistons and cylinders and calling it a day, or are you looking at a total rebuild? Depending on the health of this engine, you might be advised to evaluate the bottom end and the rest of the top end before thinking about pistons and cylinders. Unfortunately with these engines there's more involved than just replacing the part that's "fried"...
__________________
-jeff
back in the saddle: '95 993 - just another black C2
*SOLD*: '87 930 GP White - heroin would have been a cheaper addiction...
"Ladies and Gentlemen, from Boston Massachusetts, we are Morphine, at your service..." - Mark Sandman (RIP)
Old 02-22-2006, 08:33 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 01:36 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, 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.