i want to get an itr waterpump later on when i build my b20b/itr more. when i say build, i mean the pistons, sleeves, rods, etc. so anyway, i thought that i could hold off until summer without a water pump. what do you guys think?? what are the grand benefits of getting a water pump versus not getting one? --> especially with a b20/vtec. will it hurt to wait until summer, or not?

thanks for your input.

 

Pretty sure the theory behind water pumps if you want one with the slower flow rate. That way it gives the water a chance to cool, rather than fly through the engine too quickly to drop in temperature.

 

unless you reving the **** out of it i would hold on until the motor build. flow rate is not that big of a difference itr/gsr is only 8qpm more but after 6rpm it slows down a bit more to help cooling, oil pump should be your concern unless you have the b20z version which already comes with itr/gsr oil pump

 

Actually all the b20b/z's come with the ITR waterpump. I know my b20b4 did. I think you should be fine until summer, I'm not changing mine out until my next Timing belt change, or unless it goes out 1st. haha. But water pumps are not too pricey, I think it's only around $60 .

 

hmmm, sounds good then. i have a b20b, but i think my oil pump is like 2 years old now. too old, or still ok? anyway, i guess i will hold out on the water pump until i build up the engine this summer. thanks a lot for the knowledge guys.

 

no prob. you should be fine for now, but when it comes time for re-build. spend the extra $60 for a water pump.

 

there is this guy on ebay selling the timing belt kit for b20 (tensioner, belt, pump) for $95 buy it now all the parts are oem. Sound like a good deal?

 

aren't the b20 and gsr water pumps different, doesnt the gsr have like 4 more teeth. wouldn't that reduce rotational mass, if it even saves 20 grams it would be worth it for the die hard all motor guy as in comparison to a gsr. just be cool and get an external electric water pump

 

you have to use a vtec water pump with a vtec timing belt. its not rotational mass, its flow rate....the more teeth, the slower the flow rate, and with a higher revving engine, you want to keep the motor as cool as possible.

 

through my experience, a honda motor does not need to much flow a lot to keep coolm plus faster moving water has less time to transfer heat from the block. So imo the smaller water pump would actually be more beneficial than a larger vtec one plus the timing belts are also longer which adds even more wieght. With my last motor i used both gsr and b20 waterpumps w/ the appropriate belt and did not ever seen a difference in temps even on road trips or 400+ miles.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2000ekhatch &raquo;</TD></TR><TR><TD CLASS="quote">through my experience, a honda motor does not need to much flow a lot to keep coolm plus faster moving water has less time to transfer heat from the block. So imo the smaller water pump would actually be more beneficial than a larger vtec one...</TD></TR></TABLE>

aren't you contradicting yourself? if the wheel is smaller, it will spin faster, right? thus you want a larger wheel (19t gsr pump) to flow the coolant at a slower pace.

 

Slowing down the coolant will not give you better cooling. Sure there will be more time for the coolant to absorb heat, BUT as it absorbs heat the temperature of the water increases. The hotter the coolant water is the less heat it will absorb (2nd law of thermodynamics). Flowing the coolant at a higher rate ensures that the temperature difference is higher and thus the total heat transfer will be higher. The engine doesn't care how much coolant is out there, only what temperature it is.

Short answer the more coolant you move through the engine the better cooling you'll get.

For those people that have put on faster spinning pumps and gotten reduced cooling, remember that faster spinning doesn't mean higher flow rate. Maybe the faster pump was cavitating because the impeller wasn't designed for that many rpm. Or maybe the impeller is smaller and flows less even at a higher speed.

Also don't forget that your engine temperature is determined by your thermostat. A bigger pump won't make your engine run any cooler than the temperature of the thermostat. It will just allow you to maintain that temperature in more sever condidtions.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tegasaurus &raquo;</TD></TR><TR><TD CLASS="quote">

aren't you contradicting yourself? if the wheel is smaller, it will spin faster, right? thus you want a larger wheel (19t gsr pump) to flow the coolant at a slower pace.</TD></TR></TABLE>

19T GSR/ITR and how many for b18/b20?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Garrett &raquo;</TD></TR><TR><TD CLASS="quote">

19T GSR/ITR and how many for b18/b20?</TD></TR></TABLE>

No it's the other way around, B-series VTEC pumps are 22T and LS is 19T. More teeth means it will rotate slower to keep the impeller from cavitating at higher revs.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Pondus &raquo;</TD></TR><TR><TD CLASS="quote">

No it's the other way around, B-series VTEC pumps are 22T and LS is 19T. More teeth means it will rotate slower to keep the impeller from cavitating at higher revs.</TD></TR></TABLE>

thanks alot for the good infos