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Registered
Join Date: Oct 2006
Location: Bellevue, Washington
Posts: 130
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Head Gasket
What is the difference between the Porsche 951 stock head gasket, the wide-fire, the Cosmetic and a full copper head gaskets? I will be using one of these on a stock 2.5 turbo engine with 19 psi boost.
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89 951 White and very FASTTTTT 99 Olds Intrigue |
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01-31-2014, 08:34 PM
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That Guy
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Wide fire has a wider fire ring meant to be used with an o-ringed head or block. Most will say not worthwhile to run without.
Cometic is a multi-layered steel gasket. Much more durable than the factory and wide fire gasket. The only issue with these is they can give some trouble with sealing correctly (external coolant leaks being the biggest issue). Sealing surface prep is critical. Personally i would not advise this unless the head at a minimum has been decked. Block and head would be better. Full copper is even more durable than Cometic. Something to consider, its less than ideal but a headgasket can be looked at like a fuse for poor tuning, running issues and over boosting. Both a stock and widefire gasket will likely blow before causing any damage to the block. A Cometic will take a beating and may eventually blow.. a full copper gasket will likely destroy the block (cracked cylinder) before it blows.
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Jon 1988 Granite Green 911 3.4L 2005 Arctic Silver 996 GT3 Past worth mentioning - 1987 924S, 1987 944, 1988 944T with 5.7L LS1 |
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02-01-2014, 04:48 AM
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In the Fires of Hell.....
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Unless your head is o-ringed, go with stock.
The widefire is meant for sealing with the o-ring - it is not as good as the stock headgasket if you are just putting stock parts back together.
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PCA Instructor: '88 951S - with LBE, Guru chips, 3Bar FPR, 1.3mm shimmed WG, 3120 lbs, 256 RWHP, 15 psig boost |
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02-01-2014, 05:37 AM
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Registered User
Join Date: Feb 2013
Posts: 84
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o rings should come with the head gasket set sold on most sites, correct?
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02-01-2014, 01:00 PM
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That Guy
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The o-ring is little more than a piece of stainless wire. The cylinder head or block (not both) must be machined with a receiver groove.
This is an o-ringed head 
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Jon 1988 Granite Green 911 3.4L 2005 Arctic Silver 996 GT3 Past worth mentioning - 1987 924S, 1987 944, 1988 944T with 5.7L LS1 |
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02-01-2014, 02:59 PM
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Porsche 944S Club Sport
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Cometic MLS is an excellent solution over OEM.
"Techno Duck is on point"
Milling and squaring is really needed with Aluminum Alloy heads once removed. Scotch brite brown engine block mating surface and use acetone to wipe to dry ( pre-installation). I went with Cometic MLS 0.43 and Permatex Copper Seal spray. Used a Craftsman digital torque wrench and followed OEM Torque procedures. ***Works best***. Turbo 8v and NA 16v heads see similar temps.... Hope this helps a bit. Later...
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Guru944  2006 955 Cayenne S Titanium Series - Marine Blue, 1987 Porsche 944S Club Sport. 1987 Buick Turbo-T Lightweight "Great White", +500HP, TA49 Turbo. http://www.blackbirdmotorsports.com, 944/951/968, 911 and 955/957 Performance Solutions. Thank you Lord, for your Loving Kindness, Tender Mercy, and Grace. Only You are Faithful. |
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02-01-2014, 08:19 PM
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Registered
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My japanese import 1990 turbo came with a wide fire gasket. I'm pretty sure it had never been opened before I pulled the head.
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1990 944 T: 100 000 km/63K miles, 1997 986 2.5L: 95 000 km/60K miles, Living in the trackless land of plenty! |
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02-09-2014, 11:39 AM
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The Kraut Burner
The Bratwurst Burner
Das Boost
944 Turbo
"Le Mans II"
"Big Blue" 955STi
NYSE Carrera
