Evans Pump?
06-04-2009, 07:17 PM
#1
Evans Pump? I bought an Evans pump on ebay and I cannot tell whether it has a small pulley or a large pulley..... I think it has the large... I am using this in a stock application and from what I have read, it is not going to work... Is that correct?
06-04-2009, 08:24 PM
#5
The large pulley is 5.25" and the small is 4.25". According to Evans, the application and engine damper diameter determine the WP pulley size. You need to calculate WP pulley drive ratio and compare it to their chart.
Here is what Evans states about pulley size:
Here is what Evans states about pulley size:
Evans Small pulley (E3910) is designed to work with the OEM crank pulley. This Pulley design maximizes cooling capacity by increasing coolant flow on factory applications more effectively then stock pulley combinations. Evans Large pulley (E3915) increases performance when using an under-drive crank pulley. Evans Small and Large pulleys are 8-rib compatible. Optimal Pump RPM range is 2500 - 6500. Pump flow (gpm) is maximized at 5500 pump RPM. For sustained high RPM applications our suggested combination is Evans Large Pulley and a 25% under-drive crank pulley. The pulleys are available as billet aluminum or anodized hard coat. Refer to LS1 Pump RPM vs. engine RPM to compare pulley drive ratios.
06-05-2009, 07:00 AM
#6
I figured out that it is the large pulley.... I am not sure I understand their description. I will call their techs and have a convo. Will report back here...
I dont see what the larger pulley will hurt in a stock situation.. As it looks like the pulley on a OE pump is about the same size as the large one.
I dont see what the larger pulley will hurt in a stock situation.. As it looks like the pulley on a OE pump is about the same size as the large one.
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06-05-2009, 11:36 PM
#11
The $150 pump will cause overheating while having a very short lifespan. You need the large pulley.
All information based on Evans recommendations.
Last edited by 405HP_Z06; 06-06-2009 at 09:07 AM.
06-06-2009, 08:40 AM
#12
http://www.evanscooling.com/download/LS1LS6.pdf
FYI^
This doc says that the small pulley should be used for stock applications....
FYI^
This doc says that the small pulley should be used for stock applications....
06-06-2009, 08:59 AM
#13
http://www.evanscooling.com/download/LS1LS6.pdf
FYI^
This doc says that the small pulley should be used for stock applications....
FYI^
This doc says that the small pulley should be used for stock applications....
The Pump versus Engine RPM chart gives a suggested pump RPM box. Too low a pump RPM will result in higher operating temperature and eventual over heating. Too high a pump RPM results in power loss from parasitic drag creating pump cavitation and eventual over heating or pump failure.
Last edited by 405HP_Z06; 06-06-2009 at 09:11 AM.
06-06-2009, 09:30 PM
#14
I will apologize ahead of time for my ignorance. I am by far no expert on anything cars. I am just a guy who tries to save money by doing any work on my car that I can.
I thank you very much for the advice you have given so far as well.
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I have installed the pump today because the old one was about dead..... Please note that my car is in a stock application and is only drive to/from work and just to do normal stuff. It is not in any kind of race application.
Hopefully the small pulley will work in this application. I still dont fully understand all of the stuff I have read but i had to have a pump so its installed
....
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And again I will apologize for my ignorance - Do I need the Small or Large Pulley for a STOCK application as a daily driver to/from work no more no less - no racing - never above 5000 RPM on the engine. Rarely above 4000...?
I thank you very much for the advice you have given so far as well.
-------------
I have installed the pump today because the old one was about dead..... Please note that my car is in a stock application and is only drive to/from work and just to do normal stuff. It is not in any kind of race application.
Hopefully the small pulley will work in this application. I still dont fully understand all of the stuff I have read but i had to have a pump so its installed
.... ----------------
And again I will apologize for my ignorance - Do I need the Small or Large Pulley for a STOCK application as a daily driver to/from work no more no less - no racing - never above 5000 RPM on the engine. Rarely above 4000...?
06-06-2009, 09:31 PM
#15
It says you can run the small pulley AND a 10% underdrive crank pulley on a street and performance application. It also states the stock diameter crank pulley and the small WP pulley can be used for a street only application with a maximum of 5000 engine RPM's. A pulley ratio of 1.769 is way too far over driven and will limit maximum engine RPM even further. The combination your using isn't even on the chart. Did you read the fine print to the right of the pulley ratio graph?
06-08-2009, 09:24 AM
#17
I am pleased to report that the pump is installed and it is working great . I has my laptop hooked up on the way to work this morning and the coolant temp was sitting around 180 - 185 on the interstate.
Next = manual fan switch.
. I has my laptop hooked up on the way to work this morning and the coolant temp was sitting around 180 - 185 on the interstate. Next = manual fan switch.
