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Crx Water Pumps And Over Heating

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greasemonkeyreborne 5x1g's

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    • Group: 2018 Contributor
    • Location:Foreign national in TX
    • Drives: 9 crx's: #1 228k 87si beater, #2 concours 25K, #3 108K 87si, #4 98K parts car, #5 213K 87si parts car, #6 84 straman, #7 86si 150k #8 67k parts #9 129K si for straman conversion

I had conversation w a member years ago about our cars overheating for strange reasons.  I had said I’d never had the problem, but always use Honda OE for my SI.


He had an issue on his SI.  Connected temp sensors to different areas on the water jackets and discovered it was a water pump not pumping enough water on his SI


At some point, I’ll run out of my pumps and am looking for good aftermarket’s w proper impellers for the SI’s required water flow.



I was searching for Japanese aftermarket pumps.  Appears 19200-pe0-010, -000, -415 are for wagovan and non SI,s.  The 19200-pe0-515, -660 are the SI.  There are other p/n’s.  I didn’t do a deep dive on the numbers.  Was more interested in the impeller designs


Upper left is SI Honda NOS -515

Bottom left is non SI Honda NOS -415

Upper right is NPW H-22 Japan aftermarket

Lower right is Paraut H3-032 Japan aftermarket 






Packaging in same order as pumps above





Wrote down rough measurements of the impellers and paddles.  Not precise, but close.


Appears the NOS Honda -515 has a larger paddle and OD is .170” larger.  I’ve only used Honda NOS and don’t experience over heating.  I’d figure I’d share what I found.


Ill post up if I find a pump w larger paddles for the SI in aftermarket


LMK ur experiences.





I don’t think I’ll use the aftermarket’s on SI.  The paraut just looks funny.  Probably better for a DX

Keepin' it OEM


Amazing research and info!

86 B-Powered CRX SI (SMF Solo2, HPDE-4 NASA & TA-A Time Attack

85 CRX DX totally original
07 Harley FXST Softail

2021 Tacoma Tow/Daily