The B20VTEC discussion thread

[gbpracing]

At what kind of rpm?

Im looking to keep the same 8600rpm as I had in the old B18/Vtec.... I have heard about how delicate the sleeves are in the B20 but I need to see if it's still making power at those rpm's and where the torque curve is ! Its a real unknown for me with this build !!!
Anything thoughts you can share are most welcome if you have first hand experiance on this kind of build.

[tinkerbell]

mate, i built my B20 with 84.5 CP pistons at 12.5:1 and it has over 17'000km and seen plenty of VTEC,

i think the sleeves are fine unless you have knock...

i am rebuilding the head soon (stripped sparkplug thread - doh!!), and have removed the blocked flex pipe from the exhaust, so will be probably be pushing over 165kW on next dyno tune...

[gbpracing]

mate, i built my B20 with 84.5 CP pistons at 12.5:1 and it has over 17'000km and seen plenty of VTEC,

i think the sleeves are fine unless you have knock...

i am rebuilding the head soon (stripped sparkplug thread - doh!!), and have removed the blocked flex pipe from the exhaust, so will be probably be pushing over 165kW on next dyno tune...

Great to hear about your build and experiances with your B20Vtec.... Any chance of getting some ideas on what I can expect from my setup ?

[tinkerbell]

Great to hear about your build and experiances with your B20Vtec.... Any chance of getting some ideas on what I can expect from my setup ?

hmmm, with the scant information you have provided, between 145 and 170kW?

[gbpracing]

hmmm, with the scant information you have provided, between 145 and 170kW?

Ok here's a breif breakdown of the engine build....
B20 block with 85mm Super tech forged 12:86:1 comp, Carillo H beam rods, 3.5 kg flywheel with 7.25" Tilton hydro concentric twin plate clutch, Crank is knife edged hardened and balanced with all clutch and f/w. B16A full race ported head with 285cfm @ .500", 34mm Intake valve 29mm exhaust valves. Toda C2 Cams , Intake 260 deg @ 1.0mm, 12.5 lift, Exhaust 255 deg @ 1.0mm, 12.5 lift

Toda 4-2-1- race headers, 4x 48mm throttle bodies, Autronic engine management system. Using 105 race fuel. 450cc injectors, Bosch VL turbo Motorsport HP Fuel pump,Sard fuel pressure regulator,


If thats not enough info let me know what you need to know !

[ericl33]

Ok here's a breif breakdown of the engine build....
B20 block with 85mm forged 12:86:1 comp, Carillo H beam rods, 3.5 kg flywheel with 7.25" Tilton hydro concentric twin plate clutch, Crank is knife edged hardened and balanced with all clutch and f/w. B16A full race ported head with 285cfm @ .500", 34mm Intake valve 29mm exhaust valves. Toda C2 Cams , Intake 260 deg @ 1.0mm, 12.5 lift, Exhaust 255 deg @ 1.0mm, 12.5 lift

Toda 4-2-1- race headers, 4x 48mm throttle bodies, Autronic engine management system. Using 105 race fuel. 450cc injectors, Bosch VL turbo Motorsport HP Fuel pump,Sard fuel pressure regulator,


If thats not enough info let me know what you need to know !

how does the race fuel come?from pump or drums?

VL pump necessary?

85mm is the limit of the sleeve?

[gbpracing]

how does the race fuel come?from pump or drums?
VL pump necessary?
85mm is the limit of the sleeve?

Last time I checked, race fuel comes in drums !!!
I dont see any issues using this pump, whats your point here ?
Not sure is you are asking a question or making a statement !!!!!

[tinkerbell]

Ok here's a breif breakdown of the engine build....
B20 block with 85mm forged 12:86:1 comp,

over 12.5 is a good start, brand? design? P2W specs?

i am running CP.

Carillo H beam rods,

excellent.

3.5 kg flywheel with 7.25" Tilton hydro concentric twin plate clutch,

clutch is personal choice, but that sounds stout.

(i run exedy hyper carbon)

Crank is knife edged hardened and balanced with all clutch and f/w.

what clearances?

B16A full race ported head with 285cfm @ .500",

mine head is 300cfm @.500

34mm Intake valve 29mm exhaust valves.

i think unnecessary, but can help in boosted application, did soemoen talk you into this? or your idea?

Toda C2 Cams ,

these play nice with 2L and quads

(i am running std intake (fully ported by Endyn) and 65mm TB)

Toda 4-2-1- race headers,

should be perfect

(i am on bisimoto)

4x 48mm throttle bodies,

a bit small for 175kW? but mid will be great...

Autronic engine management system.

tuners choice? Hondata is fine for most cases...

Using 105 race fuel.

will help!

450cc injectors,

i am runing ID725cc in mine, but 450 will be OK with lots of pressure

Bosch VL turbo Motorsport HP Fuel pump,Sard fuel pressure regulator,

both OK, but also a surge tank?

If thats not enough info let me know what you need to know !

based on my amazing "head dyno" i think you should reach your target output whilst being reliable...

probly wont need to go much past 8600 to get there either...

[gbpracing]

based on my amazing "head dyno" i think you should reach your target output whilst being reliable...

probly wont need to go much past 8600 to get there either...

My engine builder went 1mm bigger on valves...
Some of your questions I dont have the info, will need to ask builder.
I do have a fuel , surge tank and also an oil accumulator..

[caruso_19]

Im looking to keep the same 8600rpm as I had in the old B18/Vtec.... I have heard about how delicate the sleeves are in the B20 but I need to see if it's still making power at those rpm's and where the torque curve is ! Its a real unknown for me with this build !!!
Anything thoughts you can share are most welcome if you have first hand experiance on this kind of build.

my b20vtec has done around 27,000 kms, it even has turbo kms on it!!. Yes the sleeves are thin, spend the money on tuning and you'll be fine.

[ericl33]

Last time I checked, race fuel comes in drums !!!
I dont see any issues using this pump, whats your point here ?
Not sure is you are asking a question or making a statement !!!!!

1 - thanks, didn't know
2 - was wondering if it is overkill?
3 - is a question.

[gbpracing]

1 - thanks, didn't know
2 - was wondering if it is overkill?
3 - is a question.

LOL
The car is for fulltime track and needs to last as long as the last engine build, that being 10 years,,,