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96mm bore headgasket
Posted: Wed Nov 05, 2014 7:05 pm
by 996TURBO
Hello,
I'm looking for a headgasket to fit a 5.0 supercharged Rover V8.
It is a JE Engineering Range Rover P38.
The engine has 96mm forged pistons.
I only find standard for 94mm pistons.
Posted: Wed Nov 05, 2014 7:49 pm
by sidecar
You can get Multi Layer Steel gaskets in several thicknesses and bore sizes..
http://www.ebay.co.uk/itm/Cometic-Head- ... 41810ff26d
There are not cheap but they are good!
Looking at the feedback on the bloke selling them on ebay would make me not buy them from him but loads of places sell MLS gaskets!
Posted: Wed Nov 05, 2014 7:57 pm
by 996TURBO
Yes Cometic gasket. That's what i found but was not sure if good.
Looks like many ricers uses those in big Supras
Posted: Wed Nov 05, 2014 8:18 pm
by kiwicar
Hi
I use them on the SBC in my slingshot, I run 11.5:1 cr, methanol and now four runs on 15% nitro and they have held up very well, very good value IMHO
best regards
Mike
Posted: Wed Nov 05, 2014 8:31 pm
by 996TURBO
Ok thanks for the info.
Now i need to figure out what thickness i need.
I have a Eaton M90 blowing and 3 intercoolers...
Standard 1,2mm HG didn't get a chance...
Posted: Wed Nov 05, 2014 8:37 pm
by sidecar
996TURBO wrote:Ok thanks for the info.
Now i need to figure out what thickness i need.
I have a Eaton M90 blowing and 3 intercoolers...
Standard 1,2mm HG didn't get a chance...
The standard gaskets are made in such a way that approximately half of the fire ring is not even crushed between the head and the block, this is due to the large chamfer at the top of each bore. As your bores are bigger than standard probably none of the fire ring would have been compressed, this allows the combustion gases ro attack the rest of the gasket.
Posted: Wed Nov 05, 2014 9:45 pm
by SimpleSimon
Posted: Wed Nov 05, 2014 10:31 pm
by Blown v8
Burtons have a 3-4 week wait on cometic's ,
I rang them today,chasing a set up I ordered 3 weeks ago
£163 a pair delivered !!! Not.cheap
Posted: Wed Nov 05, 2014 11:58 pm
by SimpleSimon
Posted: Thu Nov 06, 2014 5:36 am
by minorv8
The price in that link is for one gasket only, not a pair
Posted: Fri Nov 07, 2014 1:22 pm
by mgbloke
I recently got some 96mm head gaskets from V8 Developments £80 pair.
worth a try.
Posted: Fri Nov 07, 2014 4:31 pm
by JP.
996TURBO wrote:Hello,..I'm looking for a headgasket to fit a 5.0 supercharged Rover V8.
996TURBO wrote:... have a Eaton M90 blowing and 3 intercoolers...
Standard 1,2mm HG didn't get a chance...
5.0 pushed by one M90, there's your issue. That M90 is way to small to suplie even 1 psi boost on a 5.0 engine. They can handle 14000rpm and after that they get thermal very insufficient.
quick calculation says 18000rpm blower speed (that's 200% overdrive )gives about 5psi boost on your engine or 8psi if your not having superb flowing heads and cam.
That intake air temperature must be sky high, even with three intercoolers.
Posted: Fri Nov 07, 2014 6:49 pm
by kiwicar
Hi
for gasket thickness you want the distance between the underside face of the head and the top of the piston (the squish distance) to be between .035" and .045" so measure the distance the piston is down the bore at TDC take that away from .04" and buy the one closest to that thickness.
best regards
Mike
Posted: Fri Nov 07, 2014 7:34 pm
by sidecar
Dunno about this 5.0 engine but generally the Rover pistons are down the bores by 40 thou even at TDC so when you stick a 40 thou head gasket on the squish ends up at 80 thou which is worse than no squish at all. The normal solution is a 40 thou block skim!
Getting the squish right is good for the engine but you need to work out the CR to make sure that it is suitable for the type of engine that you are building.
Finally due to the dish in standard Rover pistons the squish band width is pretty small what ever you do! (Dunno what pistons this 5.0 engine is using!)
