Instantforum.net, the mob that powers this site (see right at bottom of this page) upgraded (!) their servers and email mid November.
I suspect this has caused the problems.
Link here

http://blog.instantasp.co.uk/General/InstantASP-Upgrades-Email-Issues


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South Australia

In regards to picture posting, something happened around Nov 15-16 that corrupted the sites forum code. Jim has been made aware of this and is waiting on the programmer to look at the problem. The computer guy that works on this site has been in Europe and unavailable to fix whatever has happened to the site.

Lorena, Texas (South of Waco)

Adding up the square area of all the smaller of the coolant holes in both head gaskets, heads and/or cylinder block is expected to get you a larger numerical value than the area value generated by the open thermostat. If the thermostat is gone, then use the calculated area of the inside of the thermostat housing neck. The coolant exit size being smaller than the coolant passages within the engine is why you will not find a problem with turbulence being generated at the exit side of the coolant holes in the head gaskets. And to make things more interesting, I’ve run as little as a single 1” hole at the coolant exit of the engine without any heating issues.

Lorena, Texas (South of Waco)

Like i said, probably more to do with the casting than water flow control. Boilers are a different animal. More velocity, certainly higher pressures and temperatures I'd guess.


Frank/Rebop

Bristol, In ( by Elkhart) 

Well, got the same explanation of Timmy, just curious why you designed the gasket like this.
I also work with boilers and other types of heating systems, designing and testing new products to the market.
In our lab, we have found that the throttles so formed many times turbulence that allows air bubbles, and you get air in the system as a result.
One of the reasons that I'm curious about this construction has been done on the gaskets.

Drives: Mercury Montclair 1957th

www.mercury1957.com

One of the reasons will be that the holes in the block are designed to support the Water jacket core. The were not really only for water circulation. The cores require a support or they will break during handling or move during the pouring operations. As Ted and others have discovered, they will move anyway. The head gaskets are designed to control flow in different parts of the block. Usually restricted up front to force water to the rear cylinders. Otherwise the Front of the engine would get all the coolant, while the rear would not get much circulation. This was probably done empirically, and may not make sense just looking at the gasket. Must have worked, your engine is close to 60 years old and still ran.

Frank/Rebop

Bristol, In ( by Elkhart) 

I wonder why they strangled holes in the gasket and only drilled small holes in some place of the hole real size.

Can no longer post pictures on the forum? Brings up a page that warns of fault.


Drives: Mercury Montclair 1957th

www.mercury1957.com

Are you asking why the water jacket hole sizes are different between the Best Gasket and Fel-Pro head gaskets or are you asking why the coolant holes in the gaskets are smaller than the corresponding holes in the head and/or block?

Lorena, Texas (South of Waco)

Why have you reduced the holes on some water channels in the heads gaskets on a 368 engine?
It has it on Fel-Pro and also Best Gasket.

It reduces the flow of the water, and then formed the turbulence after the hole in the water direction. This then creates air bubbles in the heating system. It increases the pressure, but in a wrong way, then you get air in the system.

Does anyone know the reason why they have done it this way?





Drives: Mercury Montclair 1957th

www.mercury1957.com