I've heard that there is piston to valve cleareance issues and I've heard there isn't. So my question is who has run a stock bottom end B20 with a Vtec and what kind of power did you make. This is my daily so thats why I can't do the whole RSmachine pistons.

Any help or advice is apperiated.

Thanks,
Joe

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gutted-dx &raquo;</TD></TR><TR><TD CLASS="quote">I've heard that there is piston to valve cleareance issues and I've heard there isn't. So my question is who has run a stock bottom end B20 with a Vtec and what kind of power did you make. This is my daily so thats why I can't do the whole RSmachine pistons.

Any help or advice is apperiated.

Thanks,
Joe</TD></TR></TABLE>

i use a 4 layer custom OEM head gasket cut for 84.5mm pistons. the RS ITR pistons are perfect for daily driving and they make great power to b00t

 

how much of the valve relief should be cut?
how wide back and deep?

any pics?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b20beast83 &raquo;</TD></TR><TR><TD CLASS="quote">how much of the valve relief should be cut?
how wide back and deep?

any pics?</TD></TR></TABLE>

no need for cutting on the valves...i'll check again but i doubt there was cutting needed for my setup

 

No I just don't wanna have to tear the bottom end apart because i'm gonna do this in my apartment parking lot. I'm gonna leave the motor in the car.

 

Short day at work bump

 

It depends on which cams/cam gear adjustment will be used in the set-up. Stock b16 or GSR cams will be fine with no valve relief cuts necessary. People have claimed to use CTR/ITR cams with un-cut reliefs with cam gears zeroed out but I would def. check P2V clearance before running that combo. Good luck with your build.

*edit* The info above applies if the head has not been milled or block decked.

 

what about ctr cams?

 

Roll the dice and find out.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by clean rice &raquo;</TD></TR><TR><TD CLASS="quote">Roll the dice and find out. </TD></TR></TABLE>

guess we'll know if there's a "I bent my valve thread"

 

With JUN 3's and a GSR head you will have problems, trust me.

 

With ctr cams more than likely your valves ill tap the pistons if you dont cut the reliefs. It happened to me on my ls v.

 

I've run a B20Z with CTR/ITR cams.

Block not decked, head not milled, factory cam gears


no issues at all with the setup.

 

Don't really have enough money for a new motor thats why I'm doing the frank motor. I'll prolly just mill the head and leave it like that. One last question P72 oe PR3 head?

 

Which head you choose is a personal opinion. They both flow really similar, not enough to justify one or the other. The GSR has a smaller combustion chamber design and will yield a higher compression than the b16 head. I say just use whichever you find at the best price/condition.

 

Old set-up
B20b block untouched
B16a head (no milling)
98 ITR cams (IN.0 and EX.0)
b16a2 99si manifold & TB
Stock LS header
No valve to piston contact what so ever
ran 13.40's @ 103mph

New set-up
B20b block untouched
B16a3 Head (resurfaced not sure how much)
95 GSR cams (IN.0 and EX.0)
JG Edlebrock Manifold & 68mm TB
JDM ITR header
No valve to piston contact what so ever
ran 14.10's @ 98mph

 

Good info. Guess i'll start looking for a head now. Anyone got one for sale in SoCal!

 

i got a b16 head asking 400

 

PM'd you.