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leadfoot
Joined: 11 Dec 2002
Posts: 2222
Location: gOLD cOAST Australia
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 Posted: Sat Jul 22, 2006 8:08 pm Post subject: VW pistons + 931 head |
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Has anyone used the 10:1 VW pistons in combination with a 931 head and if so..
do you have an interferance motor?? or can you confirm compression ratio...
thanks
Leadfoot
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1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress... |
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924SSilver
Joined: 05 Jul 2006
Posts: 86
Location: Stowe, Vermont
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| Posted: Mon Jul 24, 2006 12:41 pm Post subject: |
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| which VW pistons? |
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Peter_in_AU
Joined: 29 Jul 2001
Posts: 2743
Location: Sydney, Australia
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| Posted: Mon Jul 24, 2006 1:02 pm Post subject: |
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type 1 flat tops.
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1979 924 (Gone to a better place)
1974 Lotus 7 S4 "Big Valve" Twin-cam (waiting)
1982 924 (As featured on Wikipedia)
Learn to love your multimeter and may the search be with you |
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Kenodog
Joined: 25 Jun 2003
Posts: 2669
Location: Vancouver,B.C.
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| Posted: Mon Jul 24, 2006 3:27 pm Post subject: |
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iirc Racing said that with a stock head they were around 11:1 . You need to cc the head to run them on stock rods.My .02
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1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
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morghen
Joined: 21 Jan 2005
Posts: 9095
Location: Romania
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| Posted: Tue Jul 25, 2006 6:10 am Post subject: |
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whats "cc" please ?
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Supercharger and EFI kits
https://www.the924.com |
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PORSCHEV
Joined: 02 Nov 2002
Posts: 1901
Location: Cedar Lake Nova Scotia, Canada
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| Posted: Tue Jul 25, 2006 8:18 am Post subject: |
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carbon copy...come on "duh"!
I was wondering the same thing 
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1976 924
5 lug conversion, 17'C2 wheels,custom body work,327 vette engine.
1978-#53 "D" track racer. |
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Peter_in_AU
Joined: 29 Jul 2001
Posts: 2743
Location: Sydney, Australia
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| Posted: Tue Jul 25, 2006 12:34 pm Post subject: |
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| Kenodog wrote: | | iirc Racing said that with a stock head they were around 11:1 |
My calculation was 10.7:1 with the 924 head and 8.9:1 with a 931 head. That's one of the things that leadfoot is checking.
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1979 924 (Gone to a better place)
1974 Lotus 7 S4 "Big Valve" Twin-cam (waiting)
1982 924 (As featured on Wikipedia)
Learn to love your multimeter and may the search be with you |
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Kenodog
Joined: 25 Jun 2003
Posts: 2669
Location: Vancouver,B.C.
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| Posted: Tue Jul 25, 2006 1:42 pm Post subject: |
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cc'ing a head is to remove material from the combustion chamber so that they are all the same volume.This smoothes any sharp corners and adds cubic centimeters so you can do the math and figure out exactly what your CR is.
I'm pretty sure Racing said he cc'd his head to 20 or 22 cubic centimeters per chamber in order to get his CR right for 87mm flat tops.
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1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
2024 KLX140 |
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leadfoot
Joined: 11 Dec 2002
Posts: 2222
Location: gOLD cOAST Australia
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| Posted: Tue Jul 25, 2006 9:13 pm Post subject: |
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found the 87mm and 88mm piston kits at an ebay store.. kokoparts $125US...
BTW the bushings for these pins to use with the stock rods are at EBS for $10 each...
leadfoot
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1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress... |
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