okay so i'v done a bit of research, and i found the c-speed racing compr. calc and it said that i'l get a comp ratio of 10.8:1 using b16a pistons in a stockass b18b engine.....

so i was just wondering, to the ppl who'v done this, with a jump in compression of 1.6:1 (coz b18b is 9.2:1), what gains would i get with the rest of the engine being stockstandard inside, and the only other mods being i/h/e????

none of the other threads i saw covered the type of power increase one would achieve by doing this......

thanks in advance

-rich

 

with a street tune and good bolt ons, u should notice a decent increase in power.
mill the head and use a thinner gasket and it'll be higher.

 

oh, forgot to say this, im guessing i'd have to get the ecu chipped and tuned to sort out the fuelling if i raise the cr so much??

thanks guys

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by brick top &raquo;</TD></TR><TR><TD CLASS="quote">with a street tune and good bolt ons, u should notice a decent increase in power.

mill the head and use a thinner gasket and it'll be higher. </TD></TR></TABLE>

i heard there can be piston/valve clearance issues with using a single layer head gasket.

any idea of what sort of numbers, the b18b has 142 hp at the flywheel if im not mistaken??

also, will a cr of 10.8:1 be fine to run with pump gas, 95 octane from the pumps here in South Africa..

 

ttt

 

bump for some info guys, will this be worth the cash?????? anyone done this before, got numbers??

 

i used b16 pr3 pistons in my LS VTEC build and made 217hp/139tq. id say them they make good power

 

jus got a price on the pistons and rings from the honda dealer.. R3060- thats the equivalent of like $460. fark i hate the exchange rate in South Africa. and dealers. aka ripoffs. what they go for in the US??

 

probably somewhere around that, if not more.

 

p30's and jdm itrs are deffinatly good pistons for an lsvtec. Good cr, not too high or to low

 

if your gonna raise compression by swapping out pistons get something worth it. 11.5:1 is optimal for street and pump gas friendly

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by quicksilver1689 &raquo;</TD></TR><TR><TD CLASS="quote">if your gonna raise compression by swapping out pistons get something worth it. 11.5:1 is optimal for street and pump gas friendly
</TD></TR></TABLE>

what pistons would i use to get 11.5 in an otherwise stock block??
might also get 403's..

the reason i wanted to use B16A pistons is that those were the only honda's that came out with VTEC in SOuth Africa, and thus the highest cr.. no GSR, no CTR, no ITR.. any other pistons aside from GSR, ITR, CTR that would yield a higher cr with 81mm bore??

reason i want to use the B16 pistons is i figured they'l be a bit cheaper than getting afrtermarket ones, and they'd be guaranteed by honda

 

ok, so someone told me to take a look on hmotorsonline, lo and behold, CTR pisons for $169, 100 extra for rings..

so CTR in an otherwise stock engine pistons pops cr up to 11.4-1 according to the c-speed racing compression calculator .

is that still gonna be ok to run with 95 octane pump gas?? and otherwise stock internals?

 

I would stay away from ctr pistons because of the huge domes will cause you problems i would lean more towards jdm itr for the highest comp ratio, and 95 octane would be just fine (holy **** 95octane is golden we only get 91 here )

 

there'l be piston - valve clearance issues??? i'l be using a stock 3 layer headgasket..

k well i think i'l go for jdm B16A pistons (p30).. i got a mate in china, hopefully he can pick up a set there for cheap and send em over that way i get 11.1-1. else pr3, which gives 10.8-1.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EM1_00MRBuilt &raquo;</TD></TR><TR><TD CLASS="quote">holy **** 95octane is golden we only get 91 here </TD></TR></TABLE>

we used to get 97 from the pumps till the start of the year, we also had 100 from the pumps for about a year but it was leaded, not unleaded

 

yup its the domes are huge for a cast piston and people do experience problems, a pr3 or jdm itr piston you will yield the highest compression and notice the biggest gains, good luck on your build i would also suggest gettin a spoon or mugen or other 2 layer head gasket to increase your comp a little more, with that high of octane from the pump makes it alot easier.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EM1_00MRBuilt &raquo;</TD></TR><TR><TD CLASS="quote">yup its the domes are huge for a cast piston and people do experience problems, a pr3 or jdm itr piston you will yield the highest compression and notice the biggest gains, good luck on your build i would also suggest gettin a spoon or mugen or other 2 layer head gasket to increase your comp a little more, with that high of octane from the pump makes it alot easier.</TD></TR></TABLE>

awesome, thanks alot for the help bud, for you!!!!
im also gonna be chipping it, and thinking about getting 403's....

i'l post up my results when its all done

 

definately when increasing compression chipping or having your ecu tuned is benificial especially if your going to upgrade your cams. h-t in south africa

 

ok, so a guy here in SA told me he put P30's in his B18B3 (in SA it only has 130 hp and then put B20A cams in, and it made 158hp to the wheels. i want!!!

B20A cams are from the older preludes right??

 

mine did 135whp in a b18a with p30s the car was great to drive and the power curve was awsome check it out "will thrasher" etrackmasters.com look at my dyno

 

p30s give you close to 11.5:1 compression.
if you go VTEC.

buy p30s but a b16 head on that **** and buy some cams!