ok i know the b20b has lower cr than the b20z so my question is what makes the b20z have higher compression? the pistons? and how can i make a b20b have more compression? thinner head gasket? i can get a b20b for dirt cheap but im worried about the power and the low redline. thanks

 

just drop in the phk(b20z)pistons and there you go.......

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nos51 &raquo;</TD></TR><TR><TD CLASS="quote">just drop in the phk(b20z)pistons and there you go.......</TD></TR></TABLE>

And don't forget the cams.

 

ok well is the b20b an allright motor to drop in right now i just have a d16z6. i dont really want to tear apart the bottom end. and what would be a good tranny for the b20b? thanks

 

also what ecu? thanks

 

Best ECU = 1994-1995 P75. The 1992-1993 PR4 is almost the same exact thing. Best transmission for stock, non-VTEC = LS transmission. VTEC transmissions are too short for reliable freeway use.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StorminMatt &raquo;</TD></TR><TR><TD CLASS="quote">Be VTEC transmissions are too short for reliable freeway use.</TD></TR></TABLE>

since when did vtec trannies last shorter or become more unreliable if driven the same as a ls trans?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GOLDBERG &raquo;</TD></TR><TR><TD CLASS="quote"> since when did vtec trannies last shorter or become more unreliable if driven the same as a ls trans? </TD></TR></TABLE>

Since vtec trannys are shorter, that would equal higher freeway rpm, in turn meaning too much side loading on the cylinders resulting in increased wear. Vtec engines have shorter gearing from the factory because they can handle high rpm abuse for long duration. Piston squirters and the RS ratio play into this.

 

actually I think the b20b doesnt have the oil squirters nor a spot for the knock sensor to mount, but the b20z does

 

I'm about 99% sure that no B20's have oil squirters, but the b20z's do have knock sensors, and some b20b from japan do as well

 

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

Since vtec trannys are shorter, that would equal higher freeway rpm, in turn meaning too much side loading on the cylinders resulting in increased wear. Vtec engines have shorter gearing from the factory because they can handle high rpm abuse for long duration. Piston squirters and the RS ratio play into this.</TD></TR></TABLE>

ok, so if a ls and a say.. b16 were each driven at 4k for 100k miles the vtec block would fail first?prolly under 100k since there is so much wear n tear?if vtec engines were unreliable because of a LITTLE shorter gearing...i doubt honda would of made them....they made all there stuff too last.....

 

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

ok, so if a ls and a say.. b16 were each driven at 4k for 100k miles the vtec block would fail first?prolly under 100k since there is so much wear n tear?if vtec engines were unreliable because of a LITTLE shorter gearing...i doubt honda would of made them....they made all there stuff too last.....</TD></TR></TABLE>

what he means is... a vtec tranny on a non-vtec motor.... means VERY high revs and much more wear over a longer period of time

the short gears does help acceleration... but you run out of gears at like 180km/h or maybe even 170 km/h

 

ok heres another question how can i tell if the b20b im getting is jdm or not? i am looking at one from a japanese and european motor importer. its like $600 for a b20b but shouldnt it be a jdm one since its from a motor importer? thanks oh yea and the motor is obd2 but my car is obd1 so will i just need an obd2 ecu.

 

just use an obd1 p75 ecu, and then tune from there. there is no way to tell if the motor you are getting is gonna be 9.6 or 8.8:1 compression. all jdm motors say b20b, but some are 8.8, some are 9.2, and some are 9.6 CR. If you get one with a knock sensor its more likely to be the 9.6 one.

 

ok if i run the obd1 p75 i will need the obd2 to obd1 conversion wire thing right? is $600 worth the b20b swap?

 

$600 isn't a bad price for a complete longblock. If your car is obd1 and you use the obd1 p75 ecu then you don't need any conversion harness

 

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

what he means is... a vtec tranny on a non-vtec motor.... means VERY high revs and much more wear over a longer period of time

the short gears does help acceleration... but you run out of gears at like 180km/h or maybe even 170 km/h</TD></TR></TABLE>

the gearing isnt that far off from a ls... where i cruise in at 60 with my gsr trans my friend cruises at like 70 with his ls...big whoops...

 

so ls trans or si trans?

 

B16 trans= faster, but more engine wear

LS trans = slower but less engine wear.

It's up to you. If you don't use the freeway for long trips alot then the b16 trans would be better choice for sure

 

si tranny/type r with ls 5th gear.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bambbrose &raquo;</TD></TR><TR><TD CLASS="quote">B16 trans= faster, but more engine wear

LS trans = slower but less engine wear.

It's up to you. If you don't use the freeway for long trips alot then the b16 trans would be better choice for sure</TD></TR></TABLE>

You are Dumb. I've had a b20/vtec in my hatch for over 2 years, It has about 35k miles on it or so, and i'm running a b16a tranny. No problems what so ever, well except that it blows a head gasket about every 6 months.

the R/S ratio is not really that bad on a b20/vtec...its about the same as a GSR

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by powerofdreams8 &raquo;</TD></TR><TR><TD CLASS="quote">You are Dumb. I've had a b20/vtec in my hatch for over 2 years, It has about 35k miles on it or so, and i'm running a b16a tranny. No problems what so ever, well except that it blows a head gasket about every 6 months.

the R/S ratio is not really that bad on a b20/vtec...its about the same as a GSR</TD></TR></TABLE>

Just because you have done it doesn't mean that your engine isn't getting accelerated wear. It's not really the wear that is the biggest factor IMO, its the gas mileage also as well as the annoyingly loud exhaust note at 4500rpm.

I'm not an engine builder and I'm not going to go into a Piston Speed arguement, but there are quite a few threads that go over the different piston speeds with each tranny at each rpm, and also discuss cylnider side loading at those rpms.

Don't go calling people "dumb" because your car worked out.... thats like saying "its ok to drink alcohol while pregnant because my mom did it and I turned out just fine"

 

dang...freakin unreliable vtec engines hmm maybe now the value of a ls will go up and i can buy some gsr swaps for 1200

 

35k miles? haha. That sounds good for a b20vtec that probably gets rodded pretty good. But in terms of engine longevity/reliability, i think as in 200kmiles+ with no oil burning problems to be called reliable.

We're talking about highway cruising miles here no? One can rack them up pretty fast if they do a lot of highway driving.

But seriously, on a honda engine i don't think revving a few hundred rpms higher at cruising speeds is going to noticably shorten the life of the engine. Its all the ripping to redline and past redline thats going to age it quicker.

After 9 years and 333 000kms of rodding on my ls engine, plus a serious overheating to boot, that still didn't slow it down (and no oil burning), i conclude that we are splitting hairs.

d

 

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

ok, so if a ls and a say.. b16 were each driven at 4k for 100k miles the vtec block would fail first?prolly under 100k since there is so much wear n tear?if vtec engines were unreliable because of a LITTLE shorter gearing...i doubt honda would of made them....they made all there stuff too last.....</TD></TR></TABLE>

Honda knows what they are doing. This is why they build VTEC motors to tolerate high revs if they are going to use short geared transmissions on VTEC motors. BUT they do NOT use the same short geared transmissions on NON-VTEC motors. Because NON-VTEC motors are not made to run at their torque peak for hours on end.