daver

"Efforts were made to shave mass from other internal and external components of the B20B, achieving the end result of a total dry mass of 144.5 kg for the new engine, to the smaller displacement B18B's 148.1 kg, making it one of the lightest in its displacement category."



thats interesting tho, my 1990 shop manual had the b18a1 at 298lbs. so the b18b added 28lbs, the porker.

I actually tried to weigh one of my engines once and it broke the scale. I think it broke my back too, just lifting it on there.

d

drintegra

Good information, need to find out the differences in cams.

Runnerdown

I bought a 97 jdm b20 with a P8R head. It was stamped P8R on the intake manifold and throttle cable bracket as well. I am about to take it apart but it looks to have a 3 layer headgasket. I will report back soon on what I find as everything I read says it is suppose to have 2 layers. the head is aso for sale btw.

daver

you indicated that your b20b engine had stamped on its cams, R1 exhaust, and R2 intake. Your b20z had R3 ex and R4 in. All 4 were stamped p75, and both sets had different specs. http://www.nonvtec.com/board/viewtopic.php?t=2543

Well, i jsut checked my '96 jdm b20b and i do have the p75 head and p75 stamped cams. But i have the R3 exhaust cam, and <U>R1 intake cam</U>.

Whats up with that? do i have a US b20b spec exhaust cam for an intake? I've measured the size of the lobes, but how do i calculate lift? The R1 intake cam lobes are 33.65mm at the widest point, and 28.0mm across the narrow. The R3 exhaust is 33.45mm and 28.25mm.

d

JCushing

i wouldnt go by the "R" number, i belive its just a casting number not related to the profile. you calculate lift by taking the length of the tall part of the lobe and subtracting the width of the journal. then you multiply this number by the rocker ratio to determine the lift at the valve.

and for the record the cams that came with my p8r head were the low lift b20b cams and are labeled r5 and r2...

daver

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JCushing &raquo;</TD></TR><TR><TD CLASS="quote">i wouldnt go by the "R" number, i belive its just a casting number not related to the profile. you calculate lift by taking the length of the tall part of the lobe and subtracting the width of the journal. then you multiply this number by the rocker ratio to determine the lift at the valve.

and for the record the cams that came with my p8r head were the low lift b20b cams and are labeled r5 and r2...</TD></TR></TABLE>

R u sure? you friend bambam said this... ""Well, the "M" and the "L" mean nothing more than the casting code...meaning the casting line they were on. ""

... i understood the concensus was the L, M were the casting code (mine says "A") and the R number perhaps differentiated btw the profile specs. Is it the opposite now? There's got to be somthing stating differences.

98vtec

good stuff here

daver

i'm pretty sure i've got the b18b cams on there then. I can't measure duration, but the b18b cam lobe height is 33.716mm in. and 33.528mm ex. (found it online...some one confirm?).

I didn't realize the measurements were so particular as i was btw 33.6 and 33.7 depending on how i held the caliper with my b20b intake cam (and it reads a couple hundreths short too). The difference is visually negligible and nowhere near the diff. btw your b20b and b20z cams pictured.

Afterall, my engine came with the low rise ls intake manifold and a 60mm tb. The weaksauce cams would be counter productive with this setup.

Incidentally, Helms lists the b18a ('92-'93) cams at 33.716mm intake (same as b18b), and a smaller 33.230mm ex. My '90 shop manual lists the 1990 b18a cam lobe height at only 33.42 in. and the same 33.23 ex.

d

JCushing

now that i have the 3rd set of b20 cams i cant make any generalazations of the R1-5 or M/L i can only go by lift. intake cams of the US b20b and JDM P8R were both the 8.9mm peak lift version. the b20z cams matched up to the specs on crowers site listed for b18b cams. exhaust cams were all the same from what i remember... oh and if theres any difference in duration i cant measure that either..

dc-lefty

where would the p8r stamp be on the head ? is their more than one ??

JCushing

theres a bunch, notably on the bottom of the head.

los3r eG

good info

743 Stunna

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

great info as im plotting on selling all my boost and going b20 allmotor

los3r eG

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 743 Stunna &raquo;</TD></TR><TR><TD CLASS="quote">

great info as im plotting on selling all my boost and going b20 allmotor </TD></TR></TABLE> b20 this weekend for me

Blue-EM1

awesome info. Got one one the way

MrTodd

Is there a difference in the vavletrain between the P75 and the P8R heads?

Does anyone know if you can use aftermarket LS parts if you have a P8R head...? (ie LS cams, springs, retainers)

Thanks for the good information!

JCushing

i tranfered the cams springs and retainers from my p75 head to the p8r head.

The Destroyer

I have a p75 head on mine, going to see how much I can make with bolt ons. Just picked up a JDM ITR header for free.

Im on the lookout for a b16 tranny too.

MrTodd

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JCushing &raquo;</TD></TR><TR><TD CLASS="quote">i tranfered the cams springs and retainers from my p75 head to the p8r head. </TD></TR></TABLE>

Awesome. Thanks for the input!

SIC_jdm_da9

i just want to know the real redline of the b20 with a p8r head because some people say its not the same as other b20. Is that right? i got a chiped LS ecu and i know that i will be reving my b20 pass 7 so yeahh

benchmade

iTrader: (-2)

Saving in my files

pearlteg

Mr JDM South

bump for the possible answer to all my non vtec questions

MrMug3n

thanks

ware