OK, bought a built bottom end. Specs = 81.5mm cp pistons 9:1 compression, eagle rods, crank, etc. I have GSR ARP headstuds with it too. (which after some searching, these will be needed and not my b16 ones. I will be running my b16 head with JR blower setup at 9-10 pounds.

My questions... Which timing belt do I need for this combo (b16 or GSR)?
Which water pump? And is it really a big deal which water pump I use?
I was also planning on getting a one-layer gasket. anything to raise compression really. What would be the compression of this build? Using the calcs I keep coming up with like 9.78 with an OEM one-layer (but that's assuming I'm picking the right deck height). I wouldn't mind getting the comp up to ~10-11ish.

 

. Anyone?

 

I believe you use the timing set for the head you are running. I believe the water pumps are the same for all vtec engines, but check part #'s with honda/acura to confirm. The vtec water pumps are designed for higher RPM operation so they don't cavitate. I wouldn't raise compression when running the JRSC, as it adds alot of heat to the intake charge, and detonation could be an issue. 9:1 is fine for a SC'd engine, turbo adds less heat than SC.

 

it doesnt matter, vtec ones are the same pump, teeth count, b16, gsr, ITR, ARE same

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by IanB &raquo;</TD></TR><TR><TD CLASS="quote"> turbo adds less heat than SC.</TD></TR></TABLE>

Not entirely true. Turning up boost on a turbo or getting a smaller pulley on a blower raises the temp of the intake charge. Turbos are more efficient at compressing the incoming air whereas supers (not counting Lysholm screw compressors) are just air movers and try to force in more air than the engine can use, creating "boost", not actual compression.Besides, supers and turbos both benefit from the use of intercoolers.

And the lower the compression ratio on the engine, the less sensitive to detonation it will be. Running 10 to 11:1 compression doesn't leave much room for boosting. You want maximum air flow , not maximum pressure.

 

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

Not entirely true. Turning up boost on a turbo or getting a smaller pulley on a blower raises the temp of the intake charge. Turbos are more efficient at compressing the incoming air whereas supers (not counting Lysholm screw compressors) are just air movers and try to force in more air than the engine can use, creating "boost", not actual compression.Besides, supers and turbos both benefit from the use of intercoolers.

And the lower the compression ratio on the engine, the less sensitive to detonation it will be. Running 10 to 11:1 compression doesn't leave much room for boosting. You want maximum air flow , not maximum pressure.
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There's alot of good points in there, but to clarify the JRSC is an Eaton blower, and does not have provisions for an intercooler. The Eaton's are bad for heat soak, and short of water or meth injection, there isn't much you can do about it, especially if you start running smaller pulleys.

 

yeah, but I've had zero problems on my stock b16 bottom end with the 10:1 compression and 9psi from the eaton blower. So with it being a built block, I'd happily run 10:1 if I can get there, or near there.

And for the timing belt issue I just got *some* light on the situation. Gotta check to see if the info is accurate. I was told running the 19t water pump, which is the one I have actually has a different size pulley as the 21t one. apparently from what I'm told, the 19t is the older gsr water pump, and the 21t is the new gsr pump. So I'm guessing I'd have to use the older gsr timing belt to use my existing 19t water pump so the timing belt won't have any slack in it.