Finally found a waterpump, need help...

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Mar 31, 2006 | 01:26 PM

CooterCatchinVette

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Racer

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From: Fayetteville NC

Finally found a waterpump, need help...

I finally found a waterpump. It's an edelbrock off the jegs website. But I have a question. What's the difference between standard and reverse rotation? Which would you recommend for a non ZR1 1990 daily driver? Thanks! -Cooter

Mar 31, 2006 | 01:46 PM

CFI-EFI

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From: The Top of Utah

One pumps when it turns clockwise and the other pumps when it turns counter clockwise

For "a non ZR1 1990 daily driver" you are probably better off with a reverse rotation water pump.

RACE ON!!!

Mar 31, 2006 | 02:02 PM

CooterCatchinVette

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Racer

Joined: Jul 2005

Posts: 253

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From: Fayetteville NC

well obviously one pumps clockwise and one counterclockwise. i just don't know what the mechanical implications are. what difference or purpose does the rotation serve? but thanks for your help!

Mar 31, 2006 | 02:15 PM

NEVRL8T

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From: Sherwood, Arkansas

Isnt the LT1 "reverse cooled"? So wouldn't the pump in question only work on LT1?

Mar 31, 2006 | 03:11 PM

bigwave71

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From: powhatan va.

if it is a lt1 it better be reverse flow or your going to cook your heads. the reverse flow is to send the water to the heads first so they stay cool.

Mar 31, 2006 | 03:26 PM

AGENT 86

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From: Summerland B.C. Canada

Because the belt goes under the pulley, it is reverse.
If your belt went over the top part of the pulley, it would be normal

Mar 31, 2006 | 03:55 PM

Carl Johansson

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Quote:

Originally Posted by AGENT 86

Because the belt goes under the pulley, it is reverse.
If your belt went over the top part of the pulley, it would be normal

Wouldn't the impellers be vaned differently (opposite)

Mar 31, 2006 | 07:20 PM

AGENT 86

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From: Summerland B.C. Canada

Quote:

Originally Posted by Carl Johansson

Wouldn't the impellers be vaned differently (opposite)

Yes, thats why it is important to get the right rotation

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Mar 31, 2006 | 07:28 PM

Corvette Kid

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Quote:

Originally Posted by AGENT 86

Yes, thats why it is important to get the right rotation

It's not a choice or which is better. There's no difference in function or efficiency but instead a matter of which one your application requires. You definitely don't want your W/P turning in the wrong direction.

Mar 31, 2006 | 07:40 PM

#10

cv67

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From: altered state

St. Jude Donor '05

What year is the car, a 90? That would be a TPI.

Mar 31, 2006 | 08:07 PM

#11

CFI-EFI

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From: The Top of Utah

Quote:

Originally Posted by TheAngelOfDeath

Isnt the LT1 "reverse cooled"? So wouldn't the pump in question only work on LT1?

Where did LT1 come from? The opening post says:

Quote:

Originally Posted by CooterCatchinVette

Which would you recommend for a non ZR1 1990 daily driver? Thanks! -Cooter

The last time *I* looked that meant it was an L98.

Quote:

Originally Posted by bigwave71

if it is a lt1 it better be reverse flow or your going to cook your heads. the reverse flow is to send the water to the heads first so they stay cool.

It isn't an LT1. And even if it was, the "reverse flow cooling" doesn't necessarily require a reverse ROTATION water pump. And then, reverse of what? An L82 or an L98?

Quote:

Originally Posted by CFI-EFI

For "a non ZR1 1990 daily driver" you are probably better off with a reverse rotation water pump.

I plead guilty to trying to have some fun. Reverse rotation is the right answer, but the application charts would show that. I was just funnin' and played like the reverse rotation would be best for a mild, daily driver. The rotation of the pump HAS to be so that the belt will make it pump. All Chevy water pumps only ever turned in one direction, standard rotation. When serpentine belts came into fashion the water pump pulley was driven off the back side of the belt turning the water pump the wrong way. Eureka! The reverse rotation water pump was born. In 99.9% of the cases, if the water pump is "V" belt driven, the water pump will be a "standard rotation pump. If there is a serpentine belt it is probably a reverse rotation pump. I didn't mean for my fun to cause such an up roar. *I* thought it was more of a common knowledge item than it seems to be. Sorry, all.

RACE ON!!!

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