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Old 21-01-17, 09:30 PM   #1
norseman
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Join Date: Jun 2010
Location: Norway
Posts: 108
Default Cav pumps, changing elements for increased output

I have a 14hp @ 1400 AS2 with BPF1A pumps stamped 65 S 6310.

And the 20hp @1800 has 75 PS 7310 stamped on them.

Are these much likely different elements, interchangeable in the pump bodies for a higher hp rating of the 14hp, if I up the revs on it to 1800 as the later model?
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Old 26-01-17, 12:58 PM   #2
listermad
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Join Date: Feb 2011
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Quote:
Originally Posted by norseman View Post
Are these much likely different elements, interchangeable in the pump bodies for a higher hp rating of the 14hp, if I up the revs on it to 1800 as the later model?
Yes the element / plunger assemblies will be interchangeable between the two fuel pump housings, however that is not entirely the end of it, because the part of the pump codes that ends in S6310 and S7310 indicate special features that are unique to that particular application.

Without access to a CAV applications manual, which would detail exactly what those special features are, there is no way of knowing any more.

It could be a different helix angle on the element, it could be differences in the delivery valve charecteristics, it could be features that make the engine better suited to fixed speed applications or alternatively variable speed, it could even be features that make the engine easier to handle start (changes to the element plunger which retard timing at fuel rack overload (starting) position), etc
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