8rt water pumps with dual pulley grooves?

[revkev6]

hey guys I'm trying to build a blower drive with dual V-belts on a late flathead. i'm installing it in a 32 so I'm using the 8rt style pumps. I know you can get pumps for the early motors with dual grooves but I haven't seen them on later style pumps. any direction here or am I stuck with a custom pulley.

[G.M.]

Contact Skip Haney he builds pumps and can customize them.
1-941-505-9085

[RalphM]

Will the early pulleys fit on late pumps?

[Fordestes]

I have researched the same swap ,and I turned up empty handed, You might check the shaft size on the new Drake pumps , the early ford pumps have a larger shaft size , I bought some water pump hubs off the late model 60's water pumps and pressed them on the 8- b. a. shafts then made my own pullies out of aluminum. one set up I did I used a French army truck crank pulley that is for air brakes ,which is a 3 groove then made a blower pulley ,I think the crank pulley was 5 inch so I made a 6 inch blower pulley That Made 5 pounds boost from a 471 Detroit blower with a Michell Manifold. I will check my records and see for sure what the sizes are and let you Know for sure, I also bought a Dyers blower "v " Drive for an s b c , I am still working on the Dyers set up , fitting it to a Mercury.
Fordestes

[revkev6]

Thanks fordestes. That's the kind of info I need but not what I wanted to hear! I'm building my own setup with a newer eaton supercharger off a 1999 jaguar. It's an m112.

[RalphM]

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That looks goooood!

[Fordestes]

Rev k, I found a hub for the Eaton on e bay That looks like you can bolt on what ever pully you want on the blower , I am going to buy some for future use , That way I can customize the drive a little easier , I am planning on using some Eaton M- 90 blowers I have squirreled away. I don't know whether the Eaton blower shaft sizes are the same on Ford and G.M products.
If you get a hub like is offered on e-bay Keep me in the loop as to your progress. I really think the aftermarket E-bay hub Idea will work for me , I will have to make a wide grove pulley to accomplish this. [email protected].
Fordestes

[Fordestes]

Rev k , I like what you have started , as for alignment , I am planning on reversing the water pump pullies to achieve belt alignment to the blower as for crankshaft alignment I am using the small main chevy harmonic dampener so I have better access to drive pullies readily available. the ford crank is 1-5/16 and the chevy is 1-1/4, my plan is to machine the balancer to accept the Chev. crank balancer and Maybe leave about a 1/4 inch ledge inside the dampener to pilot the drive pulley then broach the dampener to a 1/4 inch keyway. I will P.M . you some more info.
Fordestes

[Fordestes]

Advice wanted , would it be ok to use the early water pumps on a late 49-53 engine if the top water ports are blocked off , I have never done it that way , this way a person can run the ball bearing double pulley water pumps to suit the blower drive belts ?
Fordestes

[Ronnieroadster]

Originally Posted by Fordestes

Advice wanted , would it be ok to use the early water pumps on a late 49-53 engine if the top water ports are blocked off , I have never done it that way , this way a person can run the ball bearing double pulley water pumps to suit the blower drive belts ?
Fordestes

That would work fine once you plug the bypass hole on the top front of the block and do the same on the deck of the block just to be sure theres no water leaks from the deck.
BUT remember those early pumps locate the pulleys close to the front of the block so running the late distributor will be impossible with the stock early double grove pulley water pumps. One problem solved and another begins.
Ronnieroadster

[Fordestes]

Would reversing (turning them to engine side out) the water pump pullies make it possible to clear the 8b a distributor, and using the late crankshaft pulley?

[Ronnieroadster]

Originally Posted by Fordestes

Would reversing (turning them to engine side out) the water pump pullies make it possible to clear the 8b a distributor, and using the late crankshaft pulley?

Never tried reversing the pulley on those early pumps myself. I bet with some measuring you could determine if it would work once you have one of those early pumps

[Fordestes]

This will give me something new to try , I cabbaged on to a few N.O.S pumps a few years ago, I may try it on a core before I ruin a N.O.S pump. sounds like a low buck way to make horsepower with the 112 blower .

[revkev6]

wonder if you could make a press fit bushing to adapt an early pump to a late pump??

[rotorwrench]

Some of the conversion distributors may clear the belt path due to the taller profile. It's worth a check anyway.

[Fordestes]

You can make a bushing but as to the dependability ? , Some one here may have the shaft size for the Drake pumps . I am wondering as to the diameter of you early pullies and the shaft size of the drake pumps, The drake pumps have a larger shaft than the stock bushing type pumps ,so this raises the question are the early pulley I. d. any where near the new style pumps?
Just a thought. I have a set of both but getting to them is a problem for me at this time. Maybe someone here will help out with the info.
Fordestes

[Bob C]

How about an industrial sheave? Get a two groove and a taper-lock bushing the size of your pump shaft.