#1
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Bosch water pumps- buyer beware
So I recently purchased two bosch water pumps for my d24's. One has the good cast impeller and the other has the lower performing stamped steel impeller. I have always purchased the bosch pumps because of the cast impeller.
It looks to me they changed over to the cheaper to produce stamped impeller.
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12mm pump heads, ARP stud kits and GTD nozzles available! http://d24t.com/showthread.php?t=1646 NA intake manifolds and 240 turbo pans for sale. Need d24 or d24t parts? PM me! Shipments done on fridays! 1982 242 D24+T/M46- Super pumped! Build thread: http://www.d24t.com/showthread.php?t=1545 1984 764 D24T/ZF build thread: http://www.d24t.com/showthread.php?t=1734 Diesel parts cars: 82 244,83 244, 84 244, 84 245, 85 745 |
#2
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How do you all feel about the polymer impellers?
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#3
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I recently replaced my orig. cast impeller WP with a new GMB (smaller dia. BTW) stamped steel impeller WP during a timing belt change. Purposely did not change out the t-stat to run a little experiment. Currently the experiment shows little change in engine tendency to overheat. Engine runs same displayed temp as before, and has not risen during high load, also as before.
I kept the cast impeller WP with the idea to eventually rebuild it w/ new bearing and seal.
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1985 744 gle d24t 1985 745 gle d24t |
#4
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I own and operate a Euro auto garage. The plastic impellers crack and as a result slip and do not pump. At times they shatter. The stamped steel ones come loose also. Cast impeller is best. VW uses plastic in all of their OE pumps.
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83 D24T 245 .50mm oversized pistons, 3 inch exhaust, but otherwise stock except the boost is turned up to 20 psi. 81 VW Caddy 1.6TD with some minor head work, and big exhaust. |
#5
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I have had the Bosch pump in my engine for a while now... I know of a few members on the D24 list that have had great results with them.. They are the plastic impeller, but they are a copy of the original and its a very thick impeller by design, unlike the newer VW pumps that are thin crap. Given the choice a steel impeller would be best, but at this point I feel like we should be happy that much of anything is still being reproduced for these engines!
Jason
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Back again with a '84 760 GLE D24T/ZF SOLD but not forgotten! 1984 760 Sedan, built D24Tic/ T-5 swapped My engine build: http://www.d24t.com/showthread.php?t...t=engine+build T-5 swap: http://d24t.com/showthread.php?399-W...to-quot-w-pics! |
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