Non-proprietary stroker assembly thread :)
01-08-2010, 02:02 AM
#17
Former Sponsor
Both cylinder heads will fit on either side of the engine, on a 928. The heads have "big" water passages to transfer the water from the cylinders to the head on each end.
Stock 928 gaskets have different gaskets on each side of the engine. Both the 1-4 gasket and the 5-8 gasket have "big" water transfer holes in the very rear of the gaskets. Water flows through the engine block (past the cylinders) to the rear of the engine, passes through the head gasket and then flows forward through the head.
Since the 968 gaskets are made for a 4 cylinder engine, the gasket has the water holes at the rear of the gasket. This requires very little modification on the 1-4 side of the engine, but if you install it on the 5-8 side, the "water transfer" holes will be at the front of the engine. This would allow the water to flow directly from the block into the head and would cause a huge air bubble in the rear of the block and head.
We cut an "extra" set of water passages in the 968 head gasket, so there are then holes at the rear. Then, we "plug" the water passages at the front of the head (where the custom plugs are). This allows the water to flow to the rear, up through the gasket and then back to the front, through the head....just like stock.
01-08-2010, 02:16 AM
#18
Rennlist Member
Got it, as I forgot that we have that extra set of cylinders on the other side. 
so, how in the heck do you plug the gasket?
It looked like the heads were modified or welded up, or was that just the gasket stain?
thanks
mk
so, how in the heck do you plug the gasket?
It looked like the heads were modified or welded up, or was that just the gasket stain?
thanks
mk
Mark:
Both cylinder heads will fit on either side of the engine, on a 928. The heads have "big" water passages to transfer the water from the cylinders to the head on each end.
Stock 928 gaskets have different gaskets on each side of the engine. Both the 1-4 gasket and the 5-8 gasket have "big" water transfer holes in the very rear of the gaskets. Water flows through the engine block (past the cylinders) to the rear of the engine, passes through the head gasket and then flows forward through the head.
Since the 968 gaskets are made for a 4 cylinder engine, the gasket has the water holes at the rear of the gasket. This requires very little modification on the 1-4 side of the engine, but if you install it on the 5-8 side, the "water transfer" holes will be at the front of the engine. This would allow the water to flow directly from the block into the head and would cause a huge air bubble in the rear of the block and head.
We cut an "extra" set of water passages in the 968 head gasket, so there are then holes at the rear. Then, we "plug" the water passages at the front of the head (where the custom plugs are). This allows the water to flow to the rear, up through the gasket and then back to the front, through the head....just like stock.
Both cylinder heads will fit on either side of the engine, on a 928. The heads have "big" water passages to transfer the water from the cylinders to the head on each end.
Stock 928 gaskets have different gaskets on each side of the engine. Both the 1-4 gasket and the 5-8 gasket have "big" water transfer holes in the very rear of the gaskets. Water flows through the engine block (past the cylinders) to the rear of the engine, passes through the head gasket and then flows forward through the head.
Since the 968 gaskets are made for a 4 cylinder engine, the gasket has the water holes at the rear of the gasket. This requires very little modification on the 1-4 side of the engine, but if you install it on the 5-8 side, the "water transfer" holes will be at the front of the engine. This would allow the water to flow directly from the block into the head and would cause a huge air bubble in the rear of the block and head.
We cut an "extra" set of water passages in the 968 head gasket, so there are then holes at the rear. Then, we "plug" the water passages at the front of the head (where the custom plugs are). This allows the water to flow to the rear, up through the gasket and then back to the front, through the head....just like stock.
01-08-2010, 02:30 AM
#19
Archive Gatekeeper
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You don't need to plug the gasket, and you don't weld the head, you need to plug the head passages. With Greg's little crafted plugs fitted to each coolant port.
01-08-2010, 02:33 AM
#20
Former Sponsor
Cometics are much easier.
01-10-2010, 06:20 PM
#25
Former Sponsor
In all fairness, Greg's gaskets didn't just get taken out of the package and installed, like Cometic would lead you to believe you can do.
I think I tried 5 sets, installing them right out of the package, like they told me to do.
I did look on the internet to see if Cometic and Rainbird had the same parent company....
I think I tried 5 sets, installing them right out of the package, like they told me to do.
I did look on the internet to see if Cometic and Rainbird had the same parent company....
01-10-2010, 07:22 PM
#28
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In all fairness, Greg's gaskets didn't just get taken out of the package and installed, like Cometic would lead you to believe you can do.
I think I tried 5 sets, installing them right out of the package, like they told me to do.
I did look on the internet to see if Cometic and Rainbird had the same parent company....
I think I tried 5 sets, installing them right out of the package, like they told me to do.
I did look on the internet to see if Cometic and Rainbird had the same parent company....
RainBird
01-10-2010, 07:31 PM
#29
Former Sponsor
My advice is actually advice I got from Brendan...who I think got advice from Todd.
The "Greenbay Guys" apparently have never had any problems with their Cometics leaking....my guess is that the water is frozen.....
The "Greenbay Guys" apparently have never had any problems with their Cometics leaking....my guess is that the water is frozen.....