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
 
Join Date: Sep 2009
Location: Germany
Posts: 124
3.0L stock rods & bolts

Hello,

Because we are in the final stages of fine tuning my warmed 3.0L SC engine with 40 Webers, GE 60 cam and JE 95mm Pistons I fear the stock rod bolts on the stock rods might not hold to the estimated max 7,1-7,2k RPMs where we plan to set the rev limiter to.

Would you think that the stock rod bolts will probably cause a problem here and we definitely should change them to ARPs?

Thanks for your input,
Christian


Last edited by atelier14; 05-09-2010 at 05:05 AM..
Old 05-09-2010, 04:57 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered
 
Join Date: Oct 2003
Location: Central Fla
Posts: 1,864
3.0 rods

For what you describe the stock rods will work well with ARP/race bolts, providing they are properly resized,magnafluxed,rebushed etc. and most importantly the rod bearing clearance is proper and not too tight. I would also recommend using the GT3RSR bearings instead of the street OEM or glyco bearings as the quality of the street bearings has not been very good for severe duty.

Mike Bruns JBRacing.com
__________________
The two most useless things to a driver are the braking distance behind you and nine-tenths of a second ago.
Old 05-09-2010, 05:18 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered
 
Join Date: Sep 2009
Location: Germany
Posts: 124
Thanks, Mike.

So you would recommend no to use stock rod bolts for my application?

The long block is finished and actually in the car right now, so changing the rod bolts to ARP would induce lots of work here...
Old 05-09-2010, 07:18 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Registered
 
BURN-BROS's Avatar
 
Join Date: Jun 2003
Location: Camarillo, Ca.
Posts: 2,418
The stock rod bolts will work for the rpm range you have stated. However I would still upgrade as it is relatively cheap insurance.
__________________
Aaron. F.S. 1965 Solex engine w carbs/cleaner
Burnham Performance
https://www.instagram.com/burnhamperformance/
Old 05-09-2010, 07:21 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered
 
Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
I think Mike & Aaron offer solid gold advice,.....

Cheaper and more convenient to do this now rather than deal with any consequences from extended high RPM use.
__________________
Steve Weiner
Rennsport Systems
Portland Oregon
(503) 244-0990
porsche@rennsportsystems.com
www.rennsportsystems.com
Old 05-09-2010, 05:07 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
3 restos WIP = psycho
 
kenikh's Avatar
 
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
Quote:
Originally Posted by MBruns View Post
GT3RSR bearings instead of the street OEM or glyco bearings as the quality of the street bearings has not been very good for severe duty.

Mike Bruns JBRacing.com
WTF??? I called my Porsche dealer and they told me all GT3 rod bearings are the same part number as the SC. Please explain, because I just DFL coated a set of Glycos I was told were the same as GT3.
__________________

- 1965 911
- 1969 911S
- 1980 911SC Targa
- 1979 930
Old 05-09-2010, 07:58 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
a.k.a. G-man
 
Geronimo '74's Avatar
 
Join Date: Sep 2003
Location: Flanders, Be
Posts: 13,652
Garage
Quote:
Originally Posted by BURN-BROS View Post
The stock rod bolts will work for the rpm range you have stated. However I would still upgrade as it is relatively cheap insurance.
3litre rodbolts are 10mm instead of 9mm for the 3.2, so you should be fine.
9mm bolts are marginal in strength in the higher RPM range, the ones you have are stronger.
It never hurts to upgrade to ARP though.
__________________
Сидеть, ложь, Переворачиваться
Old 05-09-2010, 09:21 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Registered
 
Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
Quote:
Originally Posted by kenikh View Post
WTF??? I called my Porsche dealer and they told me all GT3 rod bearings are the same part number as the SC. Please explain, because I just DFL coated a set of Glycos I was told were the same as GT3.
Hi Kenik,

The person you spoke with at your dealer is quite mistaken,....

GT-3 rod bearings carry a 996 prefix and SC ones have a 930 one; they are totally different parts.

These good bearings are not available through the aftermarket and are dealer items, only. Naturally, they come in Porsche boxes, not the red & black Glyco ones.
__________________
Steve Weiner
Rennsport Systems
Portland Oregon
(503) 244-0990
porsche@rennsportsystems.com
www.rennsportsystems.com
Old 05-09-2010, 11:25 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
Registered
 
Join Date: Sep 2009
Location: Germany
Posts: 124
Lots of good advice here, thank you!

So the GT3 rod bearings are available through Porsche dealers? Could anybody state the spare part #?
Old 05-10-2010, 01:09 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #9 (permalink)
a.k.a. G-man
 
Geronimo '74's Avatar
 
Join Date: Sep 2003
Location: Flanders, Be
Posts: 13,652
Garage
according to PET 6

996 103 121 94 (for the GT3 2004 and onwards.)
__________________
Сидеть, ложь, Переворачиваться
Old 05-10-2010, 01:15 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #10 (permalink)
Registered
 
Join Date: Oct 2003
Location: Central Fla
Posts: 1,864
RSR brgs.

That is the part # for the RSR bearing, It is treated as a motorsport part in the US and the dealers can't get them. And PMNA sure won't sell them to you unless it is packed in your freshly rebuilt race engine

Mike Bruns JBRacing.com
__________________
The two most useless things to a driver are the braking distance behind you and nine-tenths of a second ago.
Old 05-10-2010, 04:21 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #11 (permalink)
Registered
 
Join Date: Oct 2003
Location: Central Fla
Posts: 1,864
RSR brgs

Kenik, the real problem with coatings on those bearings is the build up per shell can be .0004 in. and that reduces the already too tight oil clearances in most cases unless you coat,measure, and then have the crank ground to size.

Mike Bruns
__________________
The two most useless things to a driver are the braking distance behind you and nine-tenths of a second ago.
Old 05-10-2010, 04:24 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #12 (permalink)
UnRegistered User
 
billybek's Avatar
 
Join Date: Dec 2007
Location: Calgary
Posts: 8,011
Garage
Quote:
Originally Posted by kenikh View Post
WTF??? I called my Porsche dealer and they told me all GT3 rod bearings are the same part number as the SC. Please explain, because I just DFL coated a set of Glycos I was told were the same as GT3.
From the last few months of reading this forum, it would seem that the dealer supplied bearings go through a more rigorous selection/inspection process than the aftermarket bearings. Sounds like you are ok. (not GT-3 bearings though).
__________________
Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
Old 05-10-2010, 04:26 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #13 (permalink)
3 restos WIP = psycho
 
kenikh's Avatar
 
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
Can this be right?

Pelican Parts - Product Information: 996-103-121-94-M100

Pelican sells them for $25/set. Doesn't sound right.
__________________

- 1965 911
- 1969 911S
- 1980 911SC Targa
- 1979 930
Old 05-10-2010, 10:06 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #14 (permalink)
3 restos WIP = psycho
 
kenikh's Avatar
 
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
Looked again. I did order the right part number:

996-103-121-94-M100

But they came in a red and white box. Odd.
__________________

- 1965 911
- 1969 911S
- 1980 911SC Targa
- 1979 930
Old 05-10-2010, 10:08 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #15 (permalink)
Registered
 
Join Date: Oct 2003
Location: Central Fla
Posts: 1,864
bearings

Its probably 25.00 per shell (or 50.00 per rod) that is the right part # post a pic when you recieve them
Mike Bruns
__________________
The two most useless things to a driver are the braking distance behind you and nine-tenths of a second ago.
Old 05-10-2010, 10:25 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #16 (permalink)
3 restos WIP = psycho
 
kenikh's Avatar
 
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
Will do.
__________________

- 1965 911
- 1969 911S
- 1980 911SC Targa
- 1979 930
Old 05-10-2010, 10:32 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #17 (permalink)
Registered
 
Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
Quote:
Originally Posted by kenikh View Post
Looked again. I did order the right part number:

996-103-121-94-M100

But they came in a red and white box. Odd.
Did you get them from the Dealer?
__________________
Steve Weiner
Rennsport Systems
Portland Oregon
(503) 244-0990
porsche@rennsportsystems.com
www.rennsportsystems.com
Old 05-10-2010, 11:37 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #18 (permalink)
 
3 restos WIP = psycho
 
kenikh's Avatar
 
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
Quote:
Originally Posted by Steve@Rennsport View Post
Did you get them from the Dealer?
No - a friend who has a local shop got them for me. I am getting the parts back in a few days...I'll look more closely when in hand.
__________________

- 1965 911
- 1969 911S
- 1980 911SC Targa
- 1979 930
Old 05-10-2010, 12:06 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #19 (permalink)
Registered
 
Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
FWIW,..Dealer-sourced bearings are far preferable to aftermarket ones and thats all we use in these particular engines.

__________________
Steve Weiner
Rennsport Systems
Portland Oregon
(503) 244-0990
porsche@rennsportsystems.com
www.rennsportsystems.com
Old 05-10-2010, 04:18 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #20 (permalink)
Reply


 


All times are GMT -8. The time now is 06:14 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2025 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.