Cometic gaskets
#11
Another option I’ve never heard of with the rover engines is to O-ring the heads. When I was heavy into drag racing it was all the rage for boosted applications. Machine a grove for the cylinders and water jackets, copper O-rings for the cylinders and rubber O-rings for the water jackets.
I built many high end sled motors with this system but the tolerance of head to cylinder was very tight. Also I never used sleeved cylinders, always nicasyl coated.
Not sure if it’s been tried on the rover v8.
I built many high end sled motors with this system but the tolerance of head to cylinder was very tight. Also I never used sleeved cylinders, always nicasyl coated.
Not sure if it’s been tried on the rover v8.
Last edited by Fastercat; 06-23-2018 at 08:00 PM. Reason: Spelling
#14
I am by no means an expert at anything. With that said, my mechanic is. He is 92 years old and has been rebuilding engines for 75 years. He specifically raced nailhead engines for years.
He rebuilt a motor for me recently and I provided Cometic gaskets and ARP studs for him and he refused to use them. I didn't ask why because he usually just yells at me.
He rebuilt a motor for me recently and I provided Cometic gaskets and ARP studs for him and he refused to use them. I didn't ask why because he usually just yells at me.
#15
I just watched the Cometic company video. Nice family history lesson but not one bit of information about how their design is superior to the competition, only that Cometic is willing to make gaskets nobody else is willing to make.
They need to get one of their engineers to explain why they are better, if they are better, and discuss specific applications where that superiority over the competition applies.
They need to get one of their engineers to explain why they are better, if they are better, and discuss specific applications where that superiority over the competition applies.
#16
I just watched the Cometic company video. Nice family history lesson but not one bit of information about how their design is superior to the competition, only that Cometic is willing to make gaskets nobody else is willing to make.
They need to get one of their engineers to explain why they are better, if they are better, and discuss specific applications where that superiority over the competition applies.
They need to get one of their engineers to explain why they are better, if they are better, and discuss specific applications where that superiority over the competition applies.
The gasket makes a "bead" where the metal is missing...
The head smashes down and where there are holes the gasket isnt compressed there, therefore it seals.
With our gaskets the material, coating, wears off and your left with a piece of metal anyway.
#17
Raceline
To my knowledge, steel head gaskets have been around for circa 20-30 years in various uses and forms for mostly modern performance vehicles engines where the engines are regularly stripped down. When someone proves they have used steel head gaskets for 100K+ miles without any issues I'll be convinced
To my knowledge, steel head gaskets have been around for circa 20-30 years in various uses and forms for mostly modern performance vehicles engines where the engines are regularly stripped down. When someone proves they have used steel head gaskets for 100K+ miles without any issues I'll be convinced
#18
I'll throw in my $.02 however that's about what it's worth. Cometic are MLS gaskets (multi layer steel) and the biggest advantage seems to be reusability. I rebuilt a turbocharged BMW that used a cometic gasket and did just that, I pulled the head when changing pistons, then cleaned the gasket off off and slapped it back in. This car was originally a normally aspirated car when it left the factory with a conventional gasket 30 years ago however the turbo pressurized the intake side with 18lbs of pressure so the volume of air in the combustion chamber was multiplied many times over. Power went from 182hp at the crank to 383 at the wheels. The conventional wisdom was to use a cometic gasket and ARP studs to handle the increased pressure, which it has had no problem doing for 10s of thousands of miles now.
In that so many of these Rovers seem to have headgasket failures I think that a cometic might be a good choice from a reuse standpoint. My only concern would be that the paper gasket is failing for a reason and would using a cometic adversely affect whatever process is causing the failure and thereby cause something else to fail instead. Or would it be a cure???
In that so many of these Rovers seem to have headgasket failures I think that a cometic might be a good choice from a reuse standpoint. My only concern would be that the paper gasket is failing for a reason and would using a cometic adversely affect whatever process is causing the failure and thereby cause something else to fail instead. Or would it be a cure???
Last edited by ahab; 06-26-2018 at 07:47 AM.
#19
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In that so many of these Rovers seem to have headgasket failures I think that a cometic might be a good choice from a reuse standpoint. My only concern would be that the paper gasket is failing for a reason and would using a cometic adversely affect whatever process is causing the failure and thereby cause something else to fail instead. Or would it be a cure???
In that so many of these Rovers seem to have headgasket failures I think that a cometic might be a good choice from a reuse standpoint. My only concern would be that the paper gasket is failing for a reason and would using a cometic adversely affect whatever process is causing the failure and thereby cause something else to fail instead. Or would it be a cure???
#20