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 Technical BBS > 1- Porsche Technical Forums > 911 Engine Rebuilding Forum

Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
Join Date: Jul 2003
Posts: 715
Yes the 2.8 short stroke is very nice and I believe there'll not be much difference between the 2.6 and the 2.8 short stroke. The advantage of the 2.6 is you can use a lightweight mag case whereas with a 2.8 you can't. For me, lightweight engine is important.
Old 02-18-2005, 01:23 PM
  Pelican Parts Technical Article Directory    Reply With Quote #41 (permalink)
Registered User
 
BURN-BROS's Avatar
 
Join Date: Jun 2003
Location: Camarillo, Ca.
Posts: 2,189
Actually the 2.8 is the highest recommended displacement for a mag case. It's one of the reasons why it is a popular choice.
__________________
Aaron.
Burnham Performance
1071 Avenida Acaso suite D Camarillo, Ca.
805-240-6931
http://www.burnhamperformance.com
Old 02-18-2005, 01:33 PM
  Pelican Parts Technical Article Directory    Reply With Quote #42 (permalink)
Licensed User
 
Shuie's Avatar
 
Join Date: Feb 2003
Location: ....down Highway 61
Posts: 6,438
2.8 short stroke (95mmx66mm) is built on a early 3.0 case with the smaller bearing journals (930/02 or 930/52). Henry has posted some good stuff about this engine config before. Grady's 2.8 is 92mmx70.4 and 11+:1. either way, a 2.8 sounds like a lot of fun.
Old 02-18-2005, 01:39 PM
  Pelican Parts Technical Article Directory    Reply With Quote #43 (permalink)
Registered User
 
BURN-BROS's Avatar
 
Join Date: Jun 2003
Location: Camarillo, Ca.
Posts: 2,189
Just for the record, and to set the record straight
I did a quick search;


"For lightweight high performance a 2.8S built on a 7R case, twin plug, 10.3:1 CR will give you ~250 HP with good reliability."

"The advantage of starting with a 3.0 is that it is more robust and you can get to 3.5 and larger. It is a somewhat heavier engine."

Best,
Grady
__________________
Aaron.
Burnham Performance
1071 Avenida Acaso suite D Camarillo, Ca.
805-240-6931
http://www.burnhamperformance.com
Old 02-18-2005, 01:45 PM
  Pelican Parts Technical Article Directory    Reply With Quote #44 (permalink)
3 restos WIP = psycho
 
kenikh's Avatar
 
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,719
Quote:
Originally posted by blue72s
Yes the 2.8 short stroke is very nice and I believe there'll not be much difference between the 2.6 and the 2.8 short stroke. The advantage of the 2.6 is you can use a lightweight mag case whereas with a 2.8 you can't. For me, lightweight engine is important.
After searching the archives, I am unable to find weight differentials between the different case flavors. How much lighter is a mag case vs. early sandcast vs. 3.0L vs 964? I hear "lighter", but am curious as to how much.

Any pointers?
Old 02-18-2005, 01:55 PM
  Pelican Parts Technical Article Directory    Reply With Quote #45 (permalink)
Registered User
 
Join Date: Jul 2003
Posts: 715
Yes I know the 2.8 is the highest recommended for a mag case but this thread is about short stroke (66mm).

Weight difference between mag and alu is 22 Lbs. BIG difference.
Old 02-18-2005, 02:07 PM
  Pelican Parts Technical Article Directory    Reply With Quote #46 (permalink)
 
Now Available for Ordering:   101 Projects For Your BMW 3 Series 1982-2000  [more info]
3 restos WIP = psycho
 
kenikh's Avatar
 
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,719
Quote:
Originally posted by blue72s
Yes I know the 2.8 is the highest recommended for a mag case but this thread is about short stroke (66mm).

Weight difference between mag and alu is 22 Lbs. BIG difference.
Yes indeed. Thanks!
Old 02-18-2005, 02:09 PM
  Pelican Parts Technical Article Directory    Reply With Quote #47 (permalink)
Registered User
 
BURN-BROS's Avatar
 
Join Date: Jun 2003
Location: Camarillo, Ca.
Posts: 2,189
Thanks for the correction, that is true.
__________________
Aaron.
Burnham Performance
1071 Avenida Acaso suite D Camarillo, Ca.
805-240-6931
http://www.burnhamperformance.com
Old 02-18-2005, 02:23 PM
  Pelican Parts Technical Article Directory    Reply With Quote #48 (permalink)
120 HP/Liter is all I ask
 
Join Date: Feb 2005
Posts: 333
Garage
I would think a short stroke 2.6 could easily be made to do more than 260 HP.

I built a short stroke "2338 cc" which was 86.7 mm Mahle 2.5 pistons on a 66 instead of a 70.4 crank for 9.8:1 CR, GE80 cams, 46X40 valves, 36X35 ports, single plug, 40 IDA w/36 mm venturis.

Made 237 HP at 7400 RPM on dyno. A little over 100 HP/ liter.

I would think 100 HP/liter easy with 2.6 as well.
__________________
"It all started when I began looking around and just could not find my dream car. So I decided to build it myself” - Ferry Porsche
Old 02-18-2005, 04:17 PM
  Pelican Parts Technical Article Directory    Reply With Quote #49 (permalink)
Registered User
 
Shaun @ Tru6's Avatar
 
Join Date: Dec 2001
Location: Cambridge, MA
Posts: 32,195
hi Everyone, just found this thread in researching a motor I may build.

I've got an opportunity to trade my tired but good 3.2 wtih 241K miles on it for a set of (from his ad):

"Brand-new, NOS, never-installed original 2.5ST Longstroke 86.7mm Pistons/Cylinders from Mahle! 10.3:1, forged pistons, Nikasil cylinders. Makes a "2.4" (2341cc) into a 2.5L (2494cc). Uses the 70.4mm crank usually. Sure, you can use the 66mm crank as well (2.0/2.2-->~2335cc). Very unique upgrade, extremely rare! Out of production for several years (NLA). Includes new GOETZ rings (impossible to get for these pistons), new clips, new pins. All in original Mahle wax paper, in perfect original Mahle boxes. "

Pretty broad question, but what am I getting myself into? this engine would go in my 69E. I imagine picking up a 2.4 case and 70.4mm crank.

With proper machine work, can I use my E's heads? MFI rebuilt to match the 2.5 needs?

what can I reasonably expect in terms of power if a proper motor is built around these P/C's?

Thanks for your help!
__________________
Tru6 Restoration & Design
Old 03-27-2005, 05:59 PM
  Pelican Parts Technical Article Directory    Reply With Quote #50 (permalink)
Registered User
 
rotorhead's Avatar
 
Join Date: Jul 2003
Location: Port Macquarie Australia
Posts: 506
There is a 911S case on ebay at the moment and the price looks very good

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=7963708156&category=33613

Steve
__________________
Steve Hall
---------------------
1988 930 Targa
1991 E36 BMW 318i
2004 Mercedes ML270
Old 03-27-2005, 06:17 PM
  Pelican Parts Technical Article Directory    Reply With Quote #51 (permalink)
Registered User
 
BURN-BROS's Avatar
 
Join Date: Jun 2003
Location: Camarillo, Ca.
Posts: 2,189
Those pistonsand cylinders are/were being sold by YTNUKLR. He is a pelican.
__________________
Aaron.
Burnham Performance
1071 Avenida Acaso suite D Camarillo, Ca.
805-240-6931
http://www.burnhamperformance.com
Old 03-28-2005, 06:44 AM
  Pelican Parts Technical Article Directory    Reply With Quote #52 (permalink)
Registered User
 
Shaun @ Tru6's Avatar
 
Join Date: Dec 2001
Location: Cambridge, MA
Posts: 32,195
Quote:
Originally posted by BURN-BROS
Those pistonsand cylinders are/were being sold by YTNUKLR. He is a pelican.
yes, thanks, Scott and I have been going back and forth quite a lot. I was hoping to get a third party opinion on what to do with these, what kind of motor they would make, etc.
__________________
Tru6 Restoration & Design
Old 03-28-2005, 07:23 AM
  Pelican Parts Technical Article Directory    Reply With Quote #53 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 02:10 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2017 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.