are b20b vtec's unstable

if i was going to put a b20 vtec in would it be unstable without bulding it or having to resleeve the block. im just wondering because everyone does ls/vtec and a b20b block is about $500. This is all asuming im not putting a turbo on it cause it dont have the money.

If you dont add turbo then the crvtec should be fine.

chances are the b20 has a longer stroke than whatever engine the vtec head came off therefore if you start revving it up past the b20's stock redline which is like 7600 I think (or whatever it is) you may blow it if you don't build the bottem end.

the b20 is a good motor because it comes with a vtec oil pump so you get the added oil pressure. but the weak link is the rod bolts. replace those with some arp rod bolts. its not bulletproof after that but its alot better than stock and it should last

so i would want to trade the b16 tranny for a wider gear ration like an ls to bring down the rpms? and if i was going to build it i would want the bottem end done first then the head?

You want to keep your b16 tranny.

If your going to build it, just do it all the first time it'll probably save time and maybe money.

you should go with the gsr transmission, and also you should get aftermarket pistons becuase somthing about the valves hitting with the stock pistons.

Its not worth the hassle to get another transmission. It would be a waste of time trying to find one or even money if you had to shell out more depending on how car smart and stuff this guy is.

ok if the b16 tranny has shorter gears than a gsr or ls and if reving the motor high is what causes the most damage to a b20 block than a slightly widertranny would make sense. Also the b16 trannys gears are so close together because it is a torqeless wimp. Thats why im looking into a b20 cause i alreadyhave the b16 in my car. Also the gsr tranny are cheaper than b16 cause the b16 is better on the track and if i had the time to take out my tranny and work on it i would just pu in an ls final gear and leave the rest alone.

yea don't waste your time w/ GSR tranny. if your upgrading transmitions get a ITR LSD tranny.

B20 cylinder walls crack if you do any kind of power enhancement other than basic mods (intake, header) . If you go nitrous - crack the cylinder. Turbo/supercharger -crack. V-tec head-crack. B20 made for torque not high compression made from a v-tec head being put on it from a b16 or b18 (accept in japan where they did it on crv with a special v-tec head for the b-20). Cracks are not fun... unless your a crack head.. and do crack and stuff.. mmmk

unless your a crack head.. and do crack and stuff.. mmmk

Speaking of yourself are we?

B20 cylinder walls crack if you do any kind of power enhancement other than basic mods (intake, header) . If you go nitrous - crack the cylinder. Turbo/supercharger -crack. V-tec head-crack. B20 made for torque not high compression made from a v-tec head being put on it from a b16 or b18 (accept in japan where they did it on crv with a special v-tec head for the b-20). Cracks are not fun... unless your a crack head.. and do crack and stuff.. mmmk

so who told you that bs ? i know your not speaking from experience. or speaking from friends experience. and if you really are then your friends dont know how to tune there motors properlly and if you want to half ass a motor then dont expect it to last.

B20 cylinder walls crack if you do any kind of power enhancement other than basic mods (intake, header) . If you go nitrous - crack the cylinder. Turbo/supercharger -crack. V-tec head-crack. B20 made for torque not high compression made from a v-tec head being put on it from a b16 or b18 (accept in japan where they did it on crv with a special v-tec head for the b-20). Cracks are not fun... unless your a crack head.. and do crack and stuff.. mmmk



:bs:

B20 cylinder walls crack if you do any kind of power enhancement other than basic mods (intake, header) . If you go nitrous - crack the cylinder. Turbo/supercharger -crack. V-tec head-crack. B20 made for torque not high compression made from a v-tec head being put on it from a b16 or b18 (accept in japan where they did it on crv with a special v-tec head for the b-20). Cracks are not fun... unless your a crack head.. and do crack and stuff.. mmmk
no not exactly, the b20 walls are thin yes, but I have only heard of them cracking when using high amounts of boost. people ride around with crvtec motors with stock sleeves. there not as weak as you think, as a matter of fact ive read about b20 motors with turbo can last up to around 6-8psi. so no your walls wont crack with a vtec head.

i did read that the stock pistons are not a good match cause the valves hit the pistons (ithink thats what they were saying it was witten in F.O.B) but a b16 piston would fix this just use the stock crank or some after maket ones. Anyway would this motor be faster than a gsr? ( i really wish i knew of sombody that has done this)

b16 pistons is higher comp than a b20 pistons. so if any of them are hitting, its the b16 pistons. but they dont because its just like an ls motor

B20 cylinder walls crack if you do any kind of power enhancement other than basic mods (intake, header) . If you go nitrous - crack the cylinder. Turbo/supercharger -crack. V-tec head-crack. B20 made for torque not high compression made from a v-tec head being put on it from a b16 or b18 (accept in japan where they did it on crv with a special v-tec head for the b-20). Cracks are not fun... unless your a crack head.. and do crack and stuff.. mmmk

My brain hurts when people make stupid comments with no factual basis.

My Ek is my only car, and for a while it was a N/A B20 VTEC. 84.5MM domed wisecos, ARP's, eagle rods, ported ITR heads, crower 402's, cheap DC header, and hondata. Made lots of power, turned it to 9000 daily.

well you cant use b16, gsr, and type r pistons because they all come from engines w/an 81mm bore, the b20 has an 84mm bore so that wouldnt work.

yea don't waste your time w/ GSR tranny. if your upgrading transmitions get a ITR LSD tranny.

The ITR tranny is good however it leaves him in the same problem as the b16. It's ratios are really short and it needs a high rpm motor to utilizie it efficiently. I would go with an LS if you are really going to change the tranny. The ratios work great with a higher tourqe car based on my expirence.

DoubleTap

The ITR tranny is good however it leaves him in the same problem as the b16. It's ratios are really short and it needs a high rpm motor to utilizie it efficiently. I would go with an LS if you are really going to change the tranny. The ratios work great with a higher tourqe car based on my expirence.

DoubleTap

8500 RPM's + ITR/B16 trans gives you 157 MPH worth of top end on street tires. An LS trans gives you 193 MPH in 5th. B16/ITR is a LOT more fun on a B20/VTEC car.

so you would need 84 mm pistons that are domed or whatever to do the vtec head right? and yes a b16 or itr tranny is a hell of lot funner but i dont have the money to fully build it to run at high rpms all day like the itr's and b16 motors and a ls is more practicle for daily driving and has a decent ratio. but a top end geared for 193 is pretty high(my old rx-7 was geared for 191 and it could never push over 140 cause it just ran out of power)

you dont neccessarily need domed pistons to run a lsvtec or crvtec. its just that higher comp pistons give you more power.

what all would he need to do to get the crvtec to rev higher?

how high do you plan on revving this motor too ?

well since his b20 already has a vtec oil pump, that takes care of that. next thing would be the rod bolts, stock rod bolts are weak and will stretch and break. get some arp rod bolts. thats the basics right there.