150 r development
Posted 26 April 2011 - 01:33 PM
Posted 27 April 2011 - 08:59 AM
Posted 28 April 2011 - 09:05 PM
They could run a stock motor and with Cooper on it, it would still rip. He's just fast.
Posted 29 April 2011 - 08:56 AM
Posted 01 May 2011 - 12:18 AM
His bike is good for sure - but they are fudging the rules a little too..
For instance the exhaust is a much larger core, huge outlet, and very short can coupled to a one off header.
Not even close to sound rules (but no am nationals test).
I watched it at LL last summer and was very impressed by it - but it had no bottom for a four stroke - very two stroke like (needs to be to compete in HP with the 112s)
This year at oakhill a different 150 holeshot almost every moto in front of cooper....so whoever was doing it had what I presume to be a little more power (talking 8/10 holeshots - no fluke)
I think the 150 will not compete with a good super two stroke in peak but it should be close in avg power - as a good 112 can pump over 30 horses to the wheel. To get a 150 there - it would take an estimated 14lb/ft at 11k for BMEP of over 230. Factor in transmission losses - and actual BMEP would have to be even higher...making it somewhat unrealistic to achieve that...
But - I see 27-8 hp within reason - and that would certainly be impressive
Posted 02 May 2011 - 06:11 AM
soon i will be tearing into the Venom CRF150.... i did all the baseline runs last season...
no mods yet.... you know my own engine building preference is to spend the least $$ for an endurance engine setup.... growing up dirt poor and fatherless made me focus on that early on... and i guess i'll never shake that sort of focus if i haven't by now...
anyways.... i would like the piston i develop to be part of your build if there is a place for it....stock bore ok? big bore?
my own focus will be to go for as much compression as possible without compromising the efficiency of the combustion chamber.... 14+ comp range....
with as small and fast buring + detonation resistane as this combustion chamber is, i would love to be able to get 14.75:1 compression if possible
Posted 02 May 2011 - 06:12 AM
Posted 02 May 2011 - 09:33 AM
Posted 02 May 2011 - 12:34 PM
Posted 02 May 2011 - 02:07 PM
Posted 03 May 2011 - 02:07 PM
Posted 05 May 2011 - 07:06 AM
Posted 05 May 2011 - 02:25 PM
Ron Hamp said:
I was planning on a CP 13:1 soon. Why did this piston not work well? Is it a bad piston in high output situations, like what you are talking about here, or will it work ok for a stock upgrade?
My engine is stock with about 12 hours, I am looking for a little bump in overall power/torque without changing pipes, cams, or jetting. I thought a 13:1 piston will do this.
If not CP, which piston is best for stock replacement?
I wonder if Honda will bump the compression on the 12s.
Posted 06 January 2012 - 12:06 PM
Posted 29 January 2012 - 11:05 AM
Still no news? Is development continuing with these engines or have you stopped? You brought out some teaser informaiton and then dropped the ball in continuing to inform about what is happening?
With the release of these bikes again for 2012 there should be some new interest in building them. Did the 5.5mm exhaust Ti valves work well and have an improved liftspan over the stock diameter valves? No dyno reports or tech info available?
Posted 29 January 2012 - 07:46 PM
Posted 05 February 2012 - 12:18 PM
You have to run a low compression ratio below 9:1 idea you want 8:1
A strong forged crank and connecting rod is a must
A strong clutch
A better cooling system
A more powerful ignition system that progarmable
A free flowing exhaust.
The superchargers can be done but hard find ready made that small of packeage
The turbocharger can be done but there a one problem know as Turbo lag and look up IHI RHB31 turbo go to MBE Motorsports
Both will cost you a lot of time and money