BK1 vs BK2 water pump pulley diameters difference - Hyundai Genesis Forum
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post #1 of 12 Old 08-08-2018 Thread Starter
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BK1 vs BK2 water pump pulley diameters difference

hi everyone

I bought a brand new bk2 2.0 water pump assembly, but noticed that pulley diameter is smaller than one on bk1. Both pumps look same.

Is there a reason why Hyundai changed pulley diameter to smaller one? Well, obviously to give more rpm to pump, but why?

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post #2 of 12 Old 08-08-2018
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I would guess for additional cooling due to the HP increase. Or if the new pulley is the same size as what the 3.8L used just reducing parts.

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post #3 of 12 Old 08-09-2018 Thread Starter
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2.0 and 3.8 pulleys are completely different in design, so that's not the case.

So if this an additional cooling, i guess it can be considered as a cooling mod for BK1

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ooooh, i just realized why

As BK2 is using donut heat exchanger for oil, coolant must take heat from engine oil too, hence need of increased flow.
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post #5 of 12 Old 08-09-2018
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Also keep in mind that " too much flow" isn't good either.

Cavitation in a fluid environment is almost always not good.
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Also keep in mind that " too much flow" isn't good either.

Cavitation in a fluid environment is almost always not good.
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This is a good note, i did not think about it. However since Hyundai does it stock on BK2 + i never heard of any mechanical cooling related issues - should it be considered safe? Additionally i have automatic, and, since i've so far not found a way to raise shift points, i'm limited to 6500rpm, which is at least 700rpm less than tuned manuals or tuned a8lr1 tcus - this will never allow me to reach same flow and pressure as most of the BK2 do, till i find a solution to tune tcu or jump over it and swap a8lr1 in.

EFR7163 2.0T BK1 A/T build - fast spooling 400whp+ 5speed auto <- let's pray it'll last a while -> https://www.gencoupe.com/gencoupe-build-projects/582313-lokiinlove-s-2-0t-t-build-thread.html
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I don't think there would be a problem, if the BK2 is OK with it. The big problem though with BK1 is the small radiator.

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That's why i got CSF rad installed

EFR7163 2.0T BK1 A/T build - fast spooling 400whp+ 5speed auto <- let's pray it'll last a while -> https://www.gencoupe.com/gencoupe-build-projects/582313-lokiinlove-s-2-0t-t-build-thread.html
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post #10 of 12 Old 08-10-2018
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I'm running the BK2 water pump housing with OEM donut cooler from a sante fe (a lil bigger) maybe I should switch my pulley out. Although i've had no issues

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I ran a Ford oil filter adapter cooler and did not have any problems. It is bigger than the Hyundai ones . If you have cooling problems then the bigger pulley would certainly help.

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post #12 of 12 Old 10-07-2018 Thread Starter
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Quote:
Originally Posted by Red Raspberry View Post
If you have cooling problems then the smaller pulley would certainly help.
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EFR7163 2.0T BK1 A/T build - fast spooling 400whp+ 5speed auto <- let's pray it'll last a while -> https://www.gencoupe.com/gencoupe-build-projects/582313-lokiinlove-s-2-0t-t-build-thread.html
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