924Board.org

sequential · Joined: 18 Nov 2005 Posts: 500 Location: BANNED

Hmmmm an audi 5 cyl to replace the audi 4 cylinder , sounds reasonable , does that now make it a 925!
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928 gts prototype
baby blue engine block
steam in 1,2,3,4 sometimes
cold star issues while on stands
112 whp with new 4 valve head and MIS 2

CBass · Joined: 03 Nov 2002 Posts: 2807 Location: Vancouver, Canada

Actually, do a search for posts by 925turbo on the board.

He was a board member from Sweden, he put a 10v turbo 5 cylinder in his 924. It required a bit of custom fabrication on the exhaust, IIRC, but he believed that a DOHC 20v 5 cylinder would clear the intake and exhaust without issues, as it is a crossflow motor. He had to fabricate his own motor mounts as well.

As for EFI, gonig from one Audi CIS engine to another is not a big deal wiring wise. I'd get teh CIS engine running in the car and work out the mechanical issues before messing around with management and tuning.

Looking at the 20v, I'm not sure if the stock wastegate would clear easily, you might still need to make a new exhaust manifold.

http://924board.org/viewtopic.php?t=3976&highlight=cylinder&sid=57dccbf00f897e957de0f264d7e9d3d6
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'81 931 in various states of assembly

moone924 · Joined: 05 Feb 2003 Posts: 867 Location: Douglas Wyoming

Keaton.... Those 20v 5 Cyl's are big bucks.... you might as well buy a 944 Turbo.
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Ryan Moone

Always shopping for a nice s2 931 to baby.
New philosophy : one car project at a time.

Paul · Posted: Mon Jan 16, 2006 8:31 am Post subject:

Belgian924t · Joined: 07 Jan 2006 Posts: 104 Location: Belgium

With all respect, but the 935 is one of the most important Porsches in the manufacturer's history...Also in the global racing history.

Greetz...
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'79 931 with Carrera GT look
'86 944 turbo (sold)
'88 944 turbo S (sold)
'85 911 Carrera 3,2 (to be restored)
'80 911 SC "SOLD"
http://www.cardomain.com/ride/2224272

Paul · Posted: Mon Jan 16, 2006 10:49 am Post subject:

OF COURSE!

No offense intended to Moby Dick:

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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

ESC944 · Joined: 21 May 2004 Posts: 747 Location: FL

AUDI PERFORMANCE AND INFORMATION
You could change the heads and mate a 10v block with the 20V head, but its some work.

http://2bennett.com/
http://www.toxcheap.com/

Hit up http://www.motorgeek.com/ for some excellent Audi engine answers.

If you want to go 20vt, try to find a complete 20vt engine, or do the hybrid thing with an NG (10v NA, 1988-1991) bottom end bolted to the 20v head, and then tune. The CIS is said to be good for 300hp as well.

The 20v head and 10v NG block together will yield around a 7.5-8.0:1 CR, and the NG bottom end is strong enough to hold 300hp if you tune it carefully enough (maybe more, the rods and pistons are not up to Audi turbo standards). Of course you can replace these as well.

The MCII should be able to make 300hp easily with either standalone EFI (and stock ignition with a chip), or carefully tuned CIS .

A 10vt is nearly indestructable, only limited on power by the fueling system, turbo, and the head. Motorgeek, is the place to get into the go fast options for the 10vt or other audi setups.

OTHER POSSIBILITIES 20v 4cyl DETAILED PICS
http://www.eclubvw.com/forums/showthread.php?s=9bf9594a49b82fc76b82f168da282c58&t=3385

VAG ENGINE INFO
http://www.eclubvw.com/forums/showthread.php?t=3139

20v 4 build up:
http://www.race101.com/project_2020.html

http://www.audi.com/audi/com/en1/glossary/biturbo.html

ONE OF MY FAVORITE AUDI SITES:
http://80tq.com/engine.html

moone924 · Joined: 05 Feb 2003 Posts: 867 Location: Douglas Wyoming

I have a nice NG short block for sale too Keaton....
_________________
Ryan Moone

Always shopping for a nice s2 931 to baby.
New philosophy : one car project at a time.