whats the scoop on a /6 water pump gasket? Does it take 2 gaskets ( one between the plate and pump housing and one between the block and plate)? Looks like all the water pumps only come with one gasket. Thanks for any info.
/6 water pump???
- Thread starter RAT ROD AL
- Start date
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Hyper_pak
Old School Chrysler Fan
Yes you need 2, it makes a sandwich. They are pretty cheap.
Thanks . 6 or 8 blade pump which do you prefer?
Hyper_pak
Old School Chrysler Fan
I use the 6. There is some discussion here : oil/water pump - Slant Six Forum Lots of talk for the 6 and the 8.
Full gasket set from Fel-Pro came with 2...
BillGrissom
Well-Known Member
Did you get a w.p. yet, or just looking at photos? There might be 2 gaskets stuck together. If not, somebody needs to tell the Chinese or their middle man.
Re which w.p. is better, I agree w/ Dan in the slantsix.org linked article. Similar discussion for small blocks. Engines w/ AC got a 6-blade pump and non-AC 8 blades, so people ask "isn't more blades better?". Can't imagine they wouldn't use the optimal #blades for both engines, since almost cost-free. Most people decided it was because the pulley diameters varied between the two, so has to do with the speed the w.p. turns. Now for radiators, they did go cheap on the slants, making the core narrower to save copper.
"I was always under the impression that the A/C pumps had less fins on the impeller specifically to move coolant slower so it would pick up more heat while in the motor. By product of that was less cavitaion."
Above statement in the link is interesting to me as an engineer. Always bizarre theories about heat transfer, fluid flow, and thermodynamics bandied about by auto hobbyists and mechanics with no education in the subjects. Less water flow thru the radiator = more cooling? No engineering textbook covers that theory, and I don't even see the "common-sense" behind it. A Robertshaw engineer tracked down the source of that common "add a restrictor plate" suggestion on hobbyist sites, if you care to search. Spoiler alert - it started from 1930's cars w/ weak radiator cap springs.
Re which w.p. is better, I agree w/ Dan in the slantsix.org linked article. Similar discussion for small blocks. Engines w/ AC got a 6-blade pump and non-AC 8 blades, so people ask "isn't more blades better?". Can't imagine they wouldn't use the optimal #blades for both engines, since almost cost-free. Most people decided it was because the pulley diameters varied between the two, so has to do with the speed the w.p. turns. Now for radiators, they did go cheap on the slants, making the core narrower to save copper.
"I was always under the impression that the A/C pumps had less fins on the impeller specifically to move coolant slower so it would pick up more heat while in the motor. By product of that was less cavitaion."
Above statement in the link is interesting to me as an engineer. Always bizarre theories about heat transfer, fluid flow, and thermodynamics bandied about by auto hobbyists and mechanics with no education in the subjects. Less water flow thru the radiator = more cooling? No engineering textbook covers that theory, and I don't even see the "common-sense" behind it. A Robertshaw engineer tracked down the source of that common "add a restrictor plate" suggestion on hobbyist sites, if you care to search. Spoiler alert - it started from 1930's cars w/ weak radiator cap springs.
No I haven't gotten a W/P yet. So after reading your post here , you have me confused, so a 6 blade moves coolant slower than the 8 blade which = more heat transfer, which = more cooling through the radiator, makes sense to me. But then you say you don't see the "common sense" behind it. Make it easy on me ---- 6 or 8 in your opinion ? LOL. Van does't get hot till I sit in stop and go traffic. Thanks AL.
joseph schrom
Well-Known Member
the water pump has one gasket mine on my 72 duster only came with one
BillGrissom
Well-Known Member
I never said the quoted statement was true. It surprises me as an engineer because it is so stupid. It also surprised the Robertshaw engineer when he first read it. But, people keep stating it (sorry you agreed with it, learn to judge for yourself, don't follow people who tweet).
As clearly stated - we (i.e. many of us here) think the optimal number of blades depends on the speed that the water pump turns (on average). That varies between options like AC because the pulley diameters vary. Since we don't have access to the engineering design documents, I would try to get a water pump PN listed for your engine and options. If that info isn't available, I would pick an 8-blade over a 6-blade.
As clearly stated - we (i.e. many of us here) think the optimal number of blades depends on the speed that the water pump turns (on average). That varies between options like AC because the pulley diameters vary. Since we don't have access to the engineering design documents, I would try to get a water pump PN listed for your engine and options. If that info isn't available, I would pick an 8-blade over a 6-blade.
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