The B20VTEC discussion thread

[tinkerbell]

i'd comfortably say a B20VTEC built with a 0km bottom end and 0km head, would last easily 250'000km with normal maintainance...

[Touge Tom]

think i might go ahead and do this aspaaa :P but final question how hard will engineers be? and how much will it cost?

you shouldn't need an engineers cert' b20 is only 10% more displacement then b18. i think anything over 15% is a must for the cert'

[Alexx]

^ Pretty sure those questions have been answered time and time again in this thread, have a read guys

My old jdm b18cr decided to grenade itself spectacularly last year so I have been putting together a b20vtec setup for quite a while now for local track days (just for fun, not really following any rules). Main points of interest are wiseco 84.5 pistons, eagle rods, knife edged/grinded b20 crank, cnc closed deck, ITR head with OS supertech running gear and kelford 176-c cams. Final static comp turned out at 11.8:1. Had it on a run in tune with standard ITR cams and a Spoon header, standard jdm dc2 b-pipe + Spoon N1, ported ITR intake mani and 68mm TB and it was making 155hp at run in limit of around 6900rpm on 101's dyno. The powercurve with the ITR cams was not very smooth though, and came onto vtec pretty aggressively, the curve almost doubled its steepness @6000rpm upon engagement. Its done about 1000km and one track day on the run in, but I pulled the motor back out to do a few other little things to the car and have changed to the kelford cams and a larger b-pipe so we'll see how they go with a real power tune with more rpm and a smoother curve with more low down torque.

Even on the run in its a really fun setup to drive, and with everyone going K series these days there is still life in the b20vtec for sure.

Any comments on the setup are appreciated

[void-]

^ Pretty sure those questions have been answered time and time again in this thread, have a read guys

My old jdm b18cr decided to grenade itself spectacularly last year so I have been putting together a b20vtec setup for quite a while now for local track days (just for fun, not really following any rules). Main points of interest are wiseco 84.5 pistons, eagle rods, knife edged/grinded b20 crank, cnc closed deck, ITR head with OS supertech running gear and kelford 176-c cams. Final static comp turned out at 11.8:1. Had it on a run in tune with standard ITR cams and a Spoon header, standard jdm dc2 b-pipe + Spoon N1, ported ITR intake mani and 68mm TB and it was making 155hp at run in limit of around 6900rpm on 101's dyno. The powercurve with the ITR cams was not very smooth though, and came onto vtec pretty aggressively, the curve almost doubled its steepness @6000rpm upon engagement. Its done about 1000km and one track day on the run in, but I pulled the motor back out to do a few other little things to the car and have changed to the kelford cams and a larger b-pipe so we'll see how they go with a real power tune with more rpm and a smoother curve with more low down torque.

Even on the run in its a really fun setup to drive, and with everyone going K series these days there is still life in the b20vtec for sure.

Any comments on the setup are appreciated

i think your setup is great for lock track days plus daily.. are you going for 70mm tb? or staying with 68mm

[Alexx]

It wont be used daily. 68 should be more than enough, if anything ive been advised to go smaller

[mocchi]

i'd comfortably say a B20VTEC built with a 0km bottom end and 0km head, would last easily 250'000km with normal maintainance...

still got ur build blog?

[tinkerbell]

nup...

[mocchi]

nup...

did you use micrometer or bore calliper to triple check measurements
after you hone the block?

and checking piston skirts, main journals etc

i cant remember.

[tinkerbell]

no, i used plastigauge to check teh machinists work on the crank and block, which was all 100% correct.

i used a micrometer to measure the rod bots and used a rod bolt stretch gauge to install the rod bolts.

the piston clearances seemed fine, and turned out they were...

i am pulling the head off this week to get a spark plug thread repaired, so will have a good look at the pistons and bores then.

it has done nearly 20'000km and is running perfectly...

[GSi_PSi]

dave, this is the forged bottom end right?

what specs on your engine if you dont mind?

[unl3a5h]

you shouldn't need an engineers cert' b20 is only 10% more displacement then b18. i think anything over 15% is a must for the cert'

lol but its in an ek so ive gone from a 1.6 already now im at 1.8 will be 2.0 so engineers is required unless there is a loop hole that allows me to go 1.6 blue slip to 1.8 then again too 2.0??

[SLOBRO]

yea stroke ur b18 block n done hahaha no1 will ever no