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Old September 6th, 2013, 09:27 AM   #1
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Default Which water-pump for SBC with serp. belt?

Quick question about SBC water-pumps;
Do the water-pumps from V-belted SBC's and serpentine belted SBC's spin in opposite directions?
Reason I ask is I am currently running a 90's SBC 350 with the stock serpentine belt set-up, but with a high-flow water-pump off of a V-belt motor. The motor tends to run hot despite having a large aluminum rad and a good 16" electric fan. Wondering if the pump is spinning the wrong way?
Thx, Jay.
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Old September 6th, 2013, 10:02 AM   #2
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Pretty sure the serpentine set-ups use a reverse rotation pump.
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Old September 6th, 2013, 04:42 PM   #3
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It is reverse rotation. Had a car in before that ran hot and the owner replaced the water pump. The install was fine, but the belt was spinning it in the wrong direction. Fixed the belt and all was well.
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Old September 6th, 2013, 04:55 PM   #4
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What he said.
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Old September 9th, 2013, 06:28 AM   #5
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Changed the pump back to the original one that came on the TBI motor and didn't really seem to make much difference??? Can still bring the temp up to 230* relatively easy. Everything seems to be working properly and the motor runs great, even tried playing around with the timing. It will even get hot just cruising down the highway. I know I need to add a shroud to the rad but I'm at a loss other than that???
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Old September 9th, 2013, 08:14 AM   #6
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Electric fan? I have a similar setup in my rig, and fought with heat. Put a hood scoop on it, cut holes in the hood, run a ford Taurus fan with aluminum shroud, and it still climbs up on the highway or when working it... Mine is a 0.060" over 350, and I was told they build heat...

When it is not working too hard, it sits around 180*...
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Old September 9th, 2013, 11:22 AM   #7
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a fan shroud can make all the difference in the world!!! put a hot rod together a couple of years ago, used a dual fan setup from derale, would not stay cool because it wasn't cooling enough surface area of the radiator, installed a shroud the same size as the radiator cores and a stock clutch fan, barely hits 180 now..
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Old September 9th, 2013, 11:38 AM   #8
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yep, fan shroud makes a huge difference. Get or make one.
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Old September 11th, 2013, 09:18 AM   #9
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Yep, definitely gonna build a nice aluminum shroud and hopefully switch to a Taurus fan, in the near future.
I'm currently running a 16" aftermarket electric fan. I also built a big 3" cowl hood to help get some of that heat out but it doesn't seem to have done a thing either. I know it's not the motor because I've had 3 different SBC's in the jeep and they all ran hot. My current motor is a freshly rebuilt, bone stock TBI 350. IMO there is no reason it should be running this hot, especially with the huge aluminum rad I'm running. I got rid of the steering box and went to hydro steering so I could fit the big rad. However XJ grill openings aren't the biggest either.
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Old September 11th, 2013, 04:02 PM   #10
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I'm picking at this on my small block XJ with decent results. A circle track rad between the steering box and frame rail, 180' stat and 1:1 pulleys (Not shown). I have a stock GM front driver fan on it currently but have a much better new Flex-a-lite cyclone on the shelf waiting for me to sort it out. No hood vents either. Winter was fine but as the weather warmed up, so did the Jeep.

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Old September 17th, 2013, 10:55 AM   #11
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Just got back from a trip up north with the jeep, outside temps were cool but I was having trouble even getting the engine up to 190* ??? Then I had to pull another Jeep about 2 or 3 miles down the trail and it was right back up to 230*. What a PITA!
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Old September 17th, 2013, 11:04 AM   #12
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well if you put a larger radiator in it without a high flow water pump it could be the fact that it isn't flowing enough through system. If you increased the fluid capacity by a few quarts or a gallon and don't have the flow required to properly move that much it could cause an issue like your saying. Also you need to think about exhaust routing and all that. Do you have headers? Is your exhaust wrapped as much as possible? Exhaust heat under the hood can cause this as well.
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Old September 20th, 2013, 10:46 AM   #13
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Well my rad isn't THAT big, it's about the same size as a chevy truck rad, just a bit thicker. Also the pump I just pulled off was an aluminum high-flow pump. I just wasn't sure if it was reverse rotation or not.
As for my exhaust, no headers I'm running 3rd gen Camaro manifolds and Y-pipe that routes under the hollow in the oil pan. The Y-pipe is wrapped. I know under hood heat is high as you can feel it radiate through the firewall/floor and blowing out through the cowl opening.
It's just strange that when it's hot outside, the engine overheats after only a few minutes under heavy load. But when it's cool/cold out, the engine will barely come up to temp (190*) under any load.
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Old September 20th, 2013, 10:56 AM   #14
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On both my 93 and 94 Chevy 1/2 tons with body lifts, they would run hot and overheat due to the fan shroud having a 3" spacer in the middle. They never overheated before the body lifts and once they were installed, my coolant would boil whenever I had it in 4wd.
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Old September 20th, 2013, 11:02 AM   #15
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Shroud shouldn't make any difference when running down the highway. Only at low speed when the fan is required to pull air through.
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