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931 twinturbo
Joined: 20 Jun 2007
Posts: 122
Location: Norway
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 Posted: Mon Feb 23, 2015 9:17 pm Post subject: How much bph with orginal Turbo |
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How much hp can the original turbo push??
And how much can the original engine take?
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911 Targa 1974 Turbolook/Outlaw
964 C2 1992mod
924 Carrera GTS Look(Project)
924Na stock 1982Mod
*911S Targa slantnose 1975mod
*924Na 1977Mod Carrera GT kit
*944NA Type 1 1984Mod
*924 Turbo Serie2 1980mod
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ideola
Joined: 01 Oct 2004
Posts: 15548
Location: Spring Lake MI
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| Posted: Tue Feb 24, 2015 1:46 am Post subject: |
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S1 supports higher horsepower top-end than S2, so it depends which turbo unit you have. The 937 K26 produced 210 BHP with CIS and a fairly inefficient top mount intercooler. So I suspect the upper bounds would be no more than 250 BHP.
As for the engine itself, there are documented examples here on the board of standard 2.0L components (specifically, the block and the head) acheiving near 400 BHP levels.
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CorsePerVita
Joined: 25 Jul 2008
Posts: 1992
Location: Redmond, Oregon
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| Posted: Tue Feb 24, 2015 1:57 am Post subject: |
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| ideola wrote: | S1 supports higher horsepower top-end than S2, so it depends which turbo unit you have. The 937 K26 produced 210 BHP with CIS and a fairly inefficient top mount intercooler. So I suspect the upper bounds would be no more than 250 BHP.
As for the engine itself, there are documented examples here on the board of standard 2.0L components (specifically, the block and the head) acheiving near 400 BHP levels. |
The question I have about that:
Are the rod bearings questionable at those levels? I feel like anything like that, they should be no doubt replaced, but how often? I know that it's always recommended on the 951. The first thing I was told by several people was "If you do ANYTHING to the car, replace the rod bearings. If it has any miles at all, replace the road bearings. REPLACE THE ROD BEARINGS."
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- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS |
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ideola
Joined: 01 Oct 2004
Posts: 15548
Location: Spring Lake MI
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| Posted: Tue Feb 24, 2015 2:43 am Post subject: |
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Always a good idea to blueprint anything that is going thru a major rebuild. New mains, new rod bearings, new rings, etc.
I've not gotten through the new 924 Carrera book yet, but the ~375BHP GTR engines used the same block, crank, and rods as ours, and rod failure was not an issue as far as I'm aware. The issue was always thermal management, especially with the rear two cylinders, causing burnt valves, blown gaskets, warped heads, etc. One of the GTR cars finished LeMans on 3 cylinders!
I've seen very few cases of rod or related failures on the 2.0L, the ones I've seen have usually been from busted timing belt = piston meets valve = bent rod. The lower end on these motors is quite stout, thanks in no small part to its heritage as a diesel block.
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CorsePerVita
Joined: 25 Jul 2008
Posts: 1992
Location: Redmond, Oregon
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| Posted: Tue Feb 24, 2015 2:51 am Post subject: |
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| ideola wrote: | Always a good idea to blueprint anything that is going thru a major rebuild. New mains, new rod bearings, new rings, etc.
I've not gotten through the new 924 Carrera book yet, but the ~375BHP GTR engines used the same block, crank, and rods as ours, and rod failure was not an issue as far as I'm aware. The issue was always thermal management, especially with the rear two cylinders, causing burnt valves, blown gaskets, warped heads, etc. One of the GTR cars finished LeMans on 3 cylinders!
I've seen very few cases of rod or related failures on the 2.0L, the ones I've seen have usually been from busted timing belt = piston meets valve = bent rod. The lower end on these motors is quite stout, thanks in no small part to its heritage as a diesel block. |
Sounds like it is a 951 inherent thing then. The 2.0L does feel like a damn stout engine. This summer I plan on a turbo rebuild and head rebuild. It's about "That time".
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- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS |
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ideola
Joined: 01 Oct 2004
Posts: 15548
Location: Spring Lake MI
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| Posted: Tue Feb 24, 2015 2:53 am Post subject: |
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Yeah, the 2.0L does not suffer the same oil starvation issue that was inherent in the 2.5L block.
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leadfoot
Joined: 11 Dec 2002
Posts: 2222
Location: gOLD cOAST Australia
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| Posted: Tue Feb 24, 2015 5:23 am Post subject: |
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Oil feeder plastic elbow in head=oil starvation at lifters
Hot spot near water jacket behind no4 cylinder = worn away metal/corrosion and blown head gasket/warped head
Heard of a few spun bearings though...
Stu
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CorsePerVita
Joined: 25 Jul 2008
Posts: 1992
Location: Redmond, Oregon
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| Posted: Tue Feb 24, 2015 6:04 am Post subject: |
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| leadfoot wrote: | Oil feeder plastic elbow in head=oil starvation at lifters
Hot spot near water jacket behind no4 cylinder = worn away metal/corrosion and blown head gasket/warped head
Heard of a few spun bearings though...
Stu |
I bought one of those delightful brass fittings to replace the plastic elbow so it's never an issue. It's a small upgrade that is well worth it IMO.
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- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS |
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morghen
Joined: 21 Jan 2005
Posts: 8884
Location: Romania
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| Posted: Tue Feb 24, 2015 6:26 am Post subject: |
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I should get a couple of those for my 924s.
Where did you get them from? Dan..or?
| CorsePerVita wrote: | | leadfoot wrote: | Oil feeder plastic elbow in head=oil starvation at lifters
Hot spot near water jacket behind no4 cylinder = worn away metal/corrosion and blown head gasket/warped head
Heard of a few spun bearings though...
Stu |
I bought one of those delightful brass fittings to replace the plastic elbow so it's never an issue. It's a small upgrade that is well worth it IMO. |
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CorsePerVita
Joined: 25 Jul 2008
Posts: 1992
Location: Redmond, Oregon
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| Posted: Tue Feb 24, 2015 6:37 am Post subject: |
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| morghen wrote: | I should get a couple of those for my 924s.
Where did you get them from? Dan..or?
| CorsePerVita wrote: | | leadfoot wrote: | Oil feeder plastic elbow in head=oil starvation at lifters
Hot spot near water jacket behind no4 cylinder = worn away metal/corrosion and blown head gasket/warped head
Heard of a few spun bearings though...
Stu |
I bought one of those delightful brass fittings to replace the plastic elbow so it's never an issue. It's a small upgrade that is well worth it IMO. |
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It was RC if I recall correctly. Peace of mind.
http://924board.org/viewtopic.php?t=24020&postdays=0&postorder=asc&start=0
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- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS |
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DZGunner
Joined: 18 Nov 2014
Posts: 191
Location: Great white north
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| Posted: Tue Feb 24, 2015 1:08 pm Post subject: |
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Didn't someone find a way to use the old heater hose port at the back to feed straight up to the RAD or something to cool that 4th cylinder down? Sometimes I find things from digging and then forget where I found it.
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CorsePerVita
Joined: 25 Jul 2008
Posts: 1992
Location: Redmond, Oregon
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| Posted: Wed Feb 25, 2015 1:28 am Post subject: |
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| DZGunner wrote: | | Didn't someone find a way to use the old heater hose port at the back to feed straight up to the RAD or something to cool that 4th cylinder down? Sometimes I find things from digging and then forget where I found it. |
You know that would be cool to know, I can see how that would be useful.
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- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS |
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931 twinturbo
Joined: 20 Jun 2007
Posts: 122
Location: Norway
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| Posted: Wed Feb 25, 2015 2:00 am Post subject: |
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Thanks guys for info...
Ideola, still haven`t used the forged pistons an the crower rods you sent to Norway... 
Too much Porsches in my garage and to much projects
But I have a friend that will help me with an complete and orginal engine.
Will throw away the bosch unit and replace it with some new and modern. 
We are aiming for 200-250bhp...
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911 Targa 1974 Turbolook/Outlaw
964 C2 1992mod
924 Carrera GTS Look(Project)
924Na stock 1982Mod
*911S Targa slantnose 1975mod
*924Na 1977Mod Carrera GT kit
*944NA Type 1 1984Mod
*924 Turbo Serie2 1980mod
*924 Turbo Serie2 1980Mod
*924NA 1982Mod |
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931 twinturbo
Joined: 20 Jun 2007
Posts: 122
Location: Norway
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| Posted: Wed Feb 25, 2015 2:14 am Post subject: |
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Here is a old pic off the car
_________________
911 Targa 1974 Turbolook/Outlaw
964 C2 1992mod
924 Carrera GTS Look(Project)
924Na stock 1982Mod
*911S Targa slantnose 1975mod
*924Na 1977Mod Carrera GT kit
*944NA Type 1 1984Mod
*924 Turbo Serie2 1980mod
*924 Turbo Serie2 1980Mod
*924NA 1982Mod |
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931 twinturbo
Joined: 20 Jun 2007
Posts: 122
Location: Norway
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| Posted: Wed Feb 25, 2015 2:16 am Post subject: |
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_________________
911 Targa 1974 Turbolook/Outlaw
964 C2 1992mod
924 Carrera GTS Look(Project)
924Na stock 1982Mod
*911S Targa slantnose 1975mod
*924Na 1977Mod Carrera GT kit
*944NA Type 1 1984Mod
*924 Turbo Serie2 1980mod
*924 Turbo Serie2 1980Mod
*924NA 1982Mod |
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