Hi guys. I've recently acquired a track/tarmac rally prepared ITR with a 'Frankenstein' derivative high spec 2L conversion. The previous owner had the engine built by a racing team in Malaysia, but did not have it put on the dyno to get an idea of the power output.

The specs:

Motec M4 ECU
Toda Vtec killer cam (305deg/12mm in & 305deg 11.5mm ex)
Toda Vtec eliminator kit, & valve springs, crower retainers
Modified CNC machined brand new B18C5 Jap spec Type R valves
Custom made 84mm pistons
custom rod
knife edged B20B crankshaft
CNC port & polish B18C5 Jap spec head assy with 3 angle valve cut
B20B Jap spec block
New B18C5 head gasket
Spoon N1 oil pump
Spoon crankshaft bearings
Custom made adj cam pulley
B18C5 Jap spec engine gaskets and seals
All rotating engine parts lightened and balanced
Bigger fuel injectors
stainless steel lightweight extractors and buddy club exhaust system

Can anyone help me with an estimate on what sort of bhp I can expect this set-up to be putting out???

Cheers

 

i never understood why ppl run vtec killer cams.. why not just do an ls head and cam it.
and we'd need the compression to make an estimate

 

Because the LS head requires drastic work to flow the same as even a stock VTEC head. That aside, even with the variable timing and lift components removed, the VTEC heads still have a better valvetrain for high RPM use. Killers weren't designed so much for making enormous power, but rather to lighten the valvetrain and the moving parts in the head. They were intended for circuit use, where the motor will see continuous high RPM.

 

^^ Very nicely put. As for the BHP "guesstimate" you really need to get it tuned on the dyno to find out. The forum rules prohibit "bench racing" and "power guesses". But it seems like a solid build. Give it a shot and find out.

 

Because your in vtec all the time..duh.

 

just so you know the term jap this and jap that is considerd ofensive to them

 

No offfence intended....just quoting the engine specs I was sent from previous owner

Sorry, wasn't aware of the no 'guestamate' rule. Merely wanted a rough idea before putting it on the dyno for some tuning. Not many workshops in my area with a great deal of knowledge on these sort of conversions.

 

have you seen an ls rocker setup? i'd be scared to run even 8k rpm on that.

 

when i first took apart a ls head i was like wow they just sit there like that .. is that safe lol

 

400whp is my guess

 

^^Really?

 

^^^seriously?

 

http://pumaracing.co.uk/PP03.htm

check out this link. it explains how to estimate power potential. it's article 3 of 3, so if you need more details read back through 1 and 2.

to sum up what it says, potential is all based on total intake valve area. you then just add or remove 10% here and there based on one factor or the other.

 

I understand what you are saying, but I was merely after some experience/results or advice from someone who may have played around with a similar set-up to give me an idea of what to expect As I mentioned before, there is noone nearby me with any experience tuning these things, so I'm just trying to do a bit of research

 

Here in Australia we have a habit of shortening many words and titles and commonly refer to ourselves as Aussies or we are from Aus or even Oz and the term Jap has never been considered offensive.
Lesson learnt and the internationaly regognised short term Jpn will be used in future.

 

Another reason (what I consider the main reason) is that some classes of racing do not allow variable cam/valve timing systems to be used.

 

Bigger valves,better flow, and a better suited valvetrain for high rpms...Ive seen quite a few non-vtec engines pop a rocker arm out of socket when revving to 8k rpm's+.
Compare both side by side and youll immediately see the many differences.

 

if that is a std unmodified head gasket it wont make too much power at all...

the B18CR is a 81mm bore...

with a proper 84mm head gasket, it would make around 150kW on a Dyno Dynamics... but you are aiming for midrange, so peak power is not relevant for you...

 

 

ive never had someone brake it down that way. makes sense to me.
and there shiny also haha

 

No one can make a estimate of this motor except the guy who built it. OP, you don't have near the required amount of information to make a reasonable "guesstimate". If you had Laskey, Justice, or any number of reputable builders assemble this engine then they could tell you how much to expect.