Welcome to the Corvette Forums at the Corvette Action Center!

Question: 91 L98 Waterpump/ Factory vs High Volume

  • Thread starter Thread starter tcramstrek
  • Start date Start date
T

tcramstrek

Guest
Does anyone have a suggestion for a good qual replacement waterpump? I am considering using a High Volume Water Pump but will it increase the operating temp on the L98? Good or Bad idea? Any Comments? My L98 runs cool on the highway with the stock waterpump however in city traffic she runs hot as a pistol>>>
 
I believe your right it might make it run hotter .Stay with a GM pump. To help with the city traffic heat I installed a switch to turn on both fans when in traffic.
Quite easy to do. the fans turn on by grounding the relays. You just need to be sure to isolate the two circuits
 
Turning the fan(s) on manually will help, but if you are in heavy city traffic with a lot of idling, AC on, etc... the OE radiator (and fans) will only dissipate so much heat. A larger and / or better radiator is the answer, not water pump.

CG
 
I ran a CAST impeller pump (edlebrock I think it was) for years and it moved water as well at idle as the stock pump did at 2000 rpm. This HELPED cooling in traffic since the problem is two-fold...lack of water movement at idle and lack of fresh air for heat exchange. After installing that pump it ran much cooler in traffic since the water was now moving and collecting heat for exchange in the radiator. even at idle.

I cannot say how that pump compared to what they call hi-vol pumps. It was hi-efficiency with the cast impeller instead of the cheapo stamped impeller in the stock pump. Sold that car...should have kept the pump.
I'd have used another one like that if it had been readily available last time I changed a pump...
 
Cooling options

I'm also in the CA. Heat. With C4 cooling small changes will make a big difference if you combine them. On my '88 the first thing I did was clean out all the trash from between the condenser and the radiator. This is the best thing you can do, and then whenever you wash the car just hose out both and it will stay clean. I turned on my small pusher fan in front of the condenser at 205 degrees and off at 180 with a low temp fan switch. This will also help the A/C because you are moving more air over both heat exchangers in stop and go traffic. Next was a 180 degree thermostat and manifold gaskets with the rear water cross over open. I also installed an Edelbrock high flow pump and removed the Frisbee. That thing is heavy, and right on the end of the water pump shaft, putting a lot of stress on the bearing. My car will run at 185 on the freeway all year long and it rarely will see temps of 212 degrees with the A/C on in stop and go traffic on the hottest days. This is with a stock radiator. I also use Honda type 2 coolant. It’s a non-silicate organic base with a high boiling point, 268 degrees. Its pre mixed and it will make the water pump last longer because of its superior lubricating properties. Before all this my car was over 200 degrees all the time.
:cool!:

 
Thanks everyone, all of the fore-mentioned tasks are completed now, I hope this helps>>>>:cool!:
 

Corvette Forums

Not a member of the Corvette Action Center?  Join now!  It's free!

Help support the Corvette Action Center!

Supporting Vendors

Dealers:

MacMulkin Chevrolet - The Second Largest Corvette Dealer in the Country!

Advertise with the Corvette Action Center!

Double Your Chances!

Our Partners

Back
Top Bottom