Overdrive water pump

5one9

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I’m putting this in a new thread so that it can be searched easily instead of being buried in another thread. Richard has a thread “My Poor Dead Engine” and in that thread overheating was brought up. I made a 6-1/8” water pump pulley to overdrive the water pump a bit and test whether it helps low speed temperatures. I won’t take credit for the idea but I wanted to see if I could get my idle temperature down from 220-ish.

I was talking with a friend who said he had a repop BBC 5-7/8” pulley from a ZL1/L78. He said it was 1-5/8” from the front to the center of the groove. I already knew my stock ‘70 Caddy pulley was 6.5” and 5/8” from front to center of the groove. Hey that’s 1” difference, as in a 1” spacer.

I bought the pulley for $35 and a 1” spacer for $25 on eBay. Way less than $160+ for a billet pulley.

Here are the pics. Oh, and I gave $17 for a 3-1/4” alternator pulley to underdrive a little compared to the 2-1/2” stocker. The belt ended up being in almost the identical position.

I’ll update results after a drive.

09159C90-9653-4A9B-84BF-148161756615.jpeg B5C2653F-C71F-4673-825D-06EED1CA33E4.jpeg FDB5A802-CEE6-44E9-B69B-3757B06D681D.jpeg DA4BA844-7A84-4994-86E9-9B2B246F0764.jpeg 629BCA21-FB2C-4779-862A-7E8A9A0ECD97.jpeg
 

2JvLo

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Interesting project! Looking forward to you're findings could hardly imagine it making a difference, But who knows. If it does i'll think about it myself. Goodluck!:thumbup:
 

5one9

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I had one main issue, my radiator was borderline at best. I have bought a new 1” x 2 core aluminum radiator that I’ll install tonight. I’ll run both pulleys and see what the difference is in idle and cruise temps under the same circumstances. My main concern is the 220 idle temps when it is only 70 outside. I have a high flow 180 and 195 thermostat and I may compare those also. I think there is balance between pushing coolant through the radiator too fast and too slow. Cadillac probably had it engineered right but my radiator is somewhat smaller than what would have been in a full size caddy.
 

richie49

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5one 9
I also have no ideal if this pulley change will work better or worse. but since a billet pulley is made to speed up the pump it must help in some situations. It might not help a stock system
but my system is thermostat flow to 10 feet (guess) or rather the lengh of a corvair thru radiator and return same lengh to the pump and back into block.
I checked the temps on mine at idle with the 180.Stayed between 185 and 193 Driving it seemed to go up to 198 and coole back down to high 180's .I put the hi flow 195 in it and I drove it
a lot yesterday and it didnt go above 208. it did good till it woundn't start back at the house :( but the temps stayed good!
Richard richie49
P.S. I would say hurry up and test it:) but no rush cause mine won't start :rofl:
 

Cadillac Kid 1

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Richie,
I don't know if you have told us elsewhere in this thread, but what size are your lines from the engine to the radiator and back?
Greg Surfs
 

5one9

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lower is 1-5/8".
upper is 1-1/2".
 

5one9

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Never mind, you were asking Richard
 

richie49

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On my car , the hoses are 1 3/4 pipe connected at various places with hose. The main problem is it isn't trustworthy. I will not know if it is going to behave while driving because somewhere along the drive it will out of the blue get hot and head to 230 temp and I don't want it to get hotter.I'm just not comfortable with that. I cant trust it to drive around with a destination in mind because I have to stay somewhere I can stop to let it cool or make it home. It didnt heat up when it was stock.When I went with the cam it started being difficult:confused::rofl: Nothing was changed with the cooling system at the time.
So that is why I'm trying things to see if it works. The HI flow thermostat seems to be keeping it within a certain range so I 'm gonna try a 180 hi flow.

Sorry :eek: Didnt mean to hijack the tread.
Richard richie49
 

5one9

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Here is a pic of my new radiator and a fan and shroud that I already had.

B94C643F-13EC-4FAD-AEA0-ABE1CA5E96AA.jpeg
 

Darius

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On my car , the hoses are 1 3/4 pipe connected at various places with hose. The main problem is it isn't trustworthy. I will not know if it is going to behave while driving because somewhere along the drive it will out of the blue get hot and head to 230 temp and I don't want it to get hotter.I'm just not comfortable with that. I cant trust it to drive around with a destination in mind because I have to stay somewhere I can stop to let it cool or make it home. It didnt heat up when it was stock.When I went with the cam it started being difficult:confused::rofl: Nothing was changed with the cooling system at the time.
So that is why I'm trying things to see if it works. The HI flow thermostat seems to be keeping it within a certain range so I 'm gonna try a 180 hi flow.

Sorry :eek: Didnt mean to hijack the tread.
Richard richie49
Not to further hijack this thread BUT Richie, have you considered that your fateful backfire might have cause your timing chain to jump gears?? :cry:
That is a possibility I hate to consider.

bro. 'Squeamish,' d :(
 

richie49

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:eek::eek::eek::(:crap:
OH god another thing to check!:laugh: Dang sure hope its not that!!The engine when it does start it runs good .I went by where I used to work Postoffice VMF because I wasnt far from the VMF and where the muffler shop is so I stopped there. Did the usual BSing Me getting this car running was a running topic,you ever gonna get it running blaa blaa blaaa. So I stopped and BS'd and when I left ,they gave me the usual will it even spin a tire crap,so I left 2 nice pretty marks about 40-50 feet long. So If it jumped timing dang what will it do with a good chain! I can check to see if its streched and how much slack in the chain.By lookinhg thru the fuel pump block off plate hole. Could it strech enough and still run decent?
Richard richie49
 

richie49

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5one9
Dang that radiator looks good. Sure hope it helps your heating up problem! After it does you know since you wont need that pulley You get rid of it pretty easy(hint hint):confused: :D :eek: :rolleyes: :rofl:
Richard richie49
 

5one9

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If you are interested, PM me an address and I'll send you the one that I made. I'll pay the postage and be glad to. I put it on the car and fired it up and it runs straight. If you turn it past 10,000 rpm, I don't guarantee it.
 

2JvLo

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Do the high flo thermostat's exitst with the second on the bottom? I've had some heating problems with my previous engine that turned out to be from a wrong type of thermostat.

Edit:
Just noticed the other threat is going into different thermostat's. There is an old and very informative threat on here somewhere, But can't seem to find it that easyo_O.
 
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