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Cedric
Joined: 27 Aug 2004
Posts: 2834
Location: Sweden
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 Posted: Fri Feb 25, 2022 5:26 am Post subject: Why you might blow your head gasket. |
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After analysing my engine block after the 2nd head gasket leak in a row it was pretty obvious why i got into issues. The whole area around the cooling channel close to cylinder 4 has sunken down over time, thus making sealing difficult, especially when more boost and timing was added. A big oversight from my side to not check the block, but it kind of got lost in the process which was a bit messy.
The interesting thing was that my spare block had similar block low areas at the same spot around the cooling channel close to the cylinder. Though much less than the block in the car, but the block in the car had been through many racing seasons before it went into my car for even more tough action and track driving. Apparently this is pretty common on old blocks like this.
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1980 924 Turbo
www.instagram.com/garagecedric/ |
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Fifty50Plus
Joined: 28 Feb 2008
Posts: 1425
Location: Washington DC area
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| Posted: Fri Feb 25, 2022 6:35 am Post subject: |
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Wow! Did you ever have the block decked/cut in the past?
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1979 924 NA race car H-Prod SCCA
1982 924 NA race car - Sold
1981 924 Turbo sold
1982 924 Turbo sold
1972 911 E race car - traded for Cayenne Diesel
1975 914 1.8 Building for H-Prod SCCA |
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924RACR
Joined: 29 Jul 2001
Posts: 9136
Location: Royal Oak, MI, USA
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| Posted: Fri Feb 25, 2022 10:04 pm Post subject: |
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Yup. A similar issue, deck no longer flat, made our race motor (NA) eat headgaskets like candy until I got it decked. It had originally been flat, but got a bit warped over the years... 
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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Cedric
Joined: 27 Aug 2004
Posts: 2834
Location: Sweden
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| Posted: Fri Feb 25, 2022 10:30 pm Post subject: |
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| Fifty50Plus wrote: | | Wow! Did you ever have the block decked/cut in the past? |
Not by me, but i don't have the history all the way back.
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1980 924 Turbo
www.instagram.com/garagecedric/ |
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Mike9311
Joined: 14 Dec 2004
Posts: 1798
Location: Chicago-ish
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| Posted: Sat Feb 26, 2022 1:13 am Post subject: |
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I'm going to check the CS block later today. This sorta thing is interesting to me.
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1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA ohne 650 mit 471
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car |
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Cedric
Joined: 27 Aug 2004
Posts: 2834
Location: Sweden
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| Posted: Sat Feb 26, 2022 5:03 am Post subject: |
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I bought a fairly Hugh spec straight edge, very handy to have around for things like these.
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1980 924 Turbo
www.instagram.com/garagecedric/ |
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Mike9311
Joined: 14 Dec 2004
Posts: 1798
Location: Chicago-ish
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| Posted: Sat Feb 26, 2022 5:06 am Post subject: |
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The CS did not have this issue on the block side but it really isn't the block to check. It was decked obviously when it was built.
I am going to look at other blocks
_________________
1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA ohne 650 mit 471
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car |
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