Quote:
Originally Posted by Dave Newcomb
Ford has two types of oil pumps '49 up and then earlier. The '48 and earlier blocks have the oil pressure relief valve in the front of the valley and 20 psi running is considered good.
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Then again, in the 48' and earlier style pumps (as fitted to CMP's), there are also 2 different pumps.
The earlier CMP oil pump could produce a maximum of 50psi cold, and around 15psi hot. The gauge sender on the block is specific to the gauge and is stamped with the number "50" on the thread. The dash gauge reads up to 50psi (and then there are 2 versions of this gauge, a brown gauge for Cab 11 nd 12, and grey gauge for Cab 13)
Then from around 1944, a new pump with a higher pressure relief was introduced that could produce 80psi max, as Dave has mentioned above. This pump had a sender marked with "80" and a gauge that reads up to 80psi (and again 2 types, a grey gauge for commercial style Cab 13 instrument clusters, and a 2 1/4" round gauge for the later military style cluster.
Brand new Ford Oil pumps are available as modern production items, but as far as I am aware, they are only made in the post-'49 style 80 psi version (which requires the modification mentioned by Dave to use in a wartime block). I have not seen any new production early-type pumps available. These new pumps are available in either a standard flow volume or a high volume design. (Melling M19 or M15). Either will work, but there is not any benefit in running a High volume M15 in a more or less standard engine.
Note too that it is perfectly fine to use an 80psi pump in an early engine, but you must use
BOTH an 80 psi sender and an 80 psi gauge with it. You can use a 50psi pump with an 80 sender/gauge combination, but never the other way around. It is also sensible to change the Bakelite timing gear to an Aluminium type if running an 80 psi pump.
As only 80psi pumps are available as new parts, I would like to see "someone" produce a brown face decal marked 0-30-80 to go on a later 80psi gauge, so that an appropriate-looking brown gauge can be used in 11 and 12 cab fords in conjunction with an 80psi pump. Anyone?
