Hi all
Ok I live in Thailand and own a NSR150RR, as parts are cheap here I did a little work on it.......
New Piston and rings along with little end bearing
1 day spent with the compressor and the die grinder on the ports, done by me.
New clutch basket
Second hand Racing pipe
Trumpet on the back of the carb (no air box and no filter)
the result is pure animal!!
I am at the stage of trying to tune the carb, the main jets are not so much of reamed but more of bored!!
At this point I would like to state that I am a 41 year old engineer that has played on crazy projects about the world and still get paid silly money to do crazy projects, so what you are about to read is the insane build of a old NSR150RR designed to fulfill the little boy in me. I get a couple of hours a day working on the bike, it is first steps in the project as it is only a couple of days since it was back on the road, but many will laugh at the extreme side to things and the direction this is going, in a world where a rebore and new piston costs about $40 usd you get to have a little fun! Enjoy the read.
after reading the parts list and the little changes many would say add a larger carb...... with the standard carb with no filter and just a trumpet with all that unrestricted air flow the results are mind blowing, so for the time being I am going to stick with a standard carb as I think there are a few other things I can do that will result in a better kick for about 20 seconds!
I had some time today where I had full power and everything worked like it should in the high revs.... WOW!
This thing is crazy, power starts to come on at 8,000 rmp at 9,500rpm it starts to kick, at 11,000 it is still pulling hard (redline). I will pull the flywheel off this week and take it to my machinist and have them remove some excess weight so that I can get the rpm into the power zone.
When this first started to kick I had a standard airbox and filter, you could feel the engine start to work but it could not get the airflow.
looking at what I could buy off the shelf it was a pod filter that had 90 deg corners or it was a trumpet with no filter..... the trumpet won!!
Standard Main jets were not going to work on this puppy!! I didnt have a clue where to start, so out came the tip cleaners for the oxy/acet torch. I progressively moved up in size, after putting the verniers on it I found it to be about 2.05mm, that is like a cannon!!!!
As for these people talking about mods too there NSR150's i find a little problem with my bike.......... There is no information on what I am playing with!!!!
Let me describe to you the moment when it kicks, the induction noise is stunning by itself, but added to that is the sound from the unrestricted pipe, when these two sounds resonate in tune the kick is amazing, with something close to a flat change (just a touch of clutch) and it is power zone in the next gear and so the story continues until it is time to end the rush and jump on the anchors!
This bike is putting out massive amounts of power, more than stock that is for sure, i would say I have an increase of around 40% as it stands now and I have not hit the correct tuning. With the next month spent on getting the carb correct and a few minor changes i think the numbesr that people are talking are going to seem a little week! 37 hp?? hahaha no way, this thing is pure animal and already passing that mark and it is still coughing like it has phenomena.
I was out playing in the rain today, so this thing was eating water, I did have the side panels on but still it was running a little of natures water injection, the running temp was down that is for sure, it also had a nicer crack to the sound, the reason I mention this is that it the fact it is rainy season in Thailand, when hot season comes that will be a different tuning story unless........
Water injection! every engine loves a rainy day........ so if it is not going to rain then with a little help from engineering I am sure I can make it seem like it is raining, a little spray on the radiator and a spray at the carb intake when under full throttle might just help when the temps start getting high, direct spray hitting the carb will help to add a little cooling as well as the temps can climb when stuck in traffic.
It will be getting a Fan on the Radiator very soon, this will be direct wired to the key, I am also looking at making an air box to cover the carb, there is fake ducting in place so I am looking at using this to feed the old girl air, the problem being that it may get a little warm going though all that ducking......... Unless
Here is the next stage of the plan designed for the hot weather!
Peltier Thermo-Electric Cooling Module.... add a few of these to a box filled with water and you start to get very very cold water add some antifreeze and you get some super cooling, when that is put though some computer CPU coolers that were are in the ducting forming intercoolers tpUhen it will cool the air, add to that a little ice water injection and that should make a happy engine!
CPU cooler http://images.anandtech.com/doci/5054/h60-h80-h100.jpg
Peltier http://www.amazon.com/TEC1-12709-Thermoelectric-Cooler-Peltier-138-6Wmax/dp/B002UQ150Q/ref=pd_sim_misc_4
The plan is to run the units up with the fluid pumps off, this will allow the motor to charge the batt to run the peltiers, when everything is cold, turn off all the peltiers and the charging system to allow the charging system to shut down to reduce load on the motor.
20 sec before start cooling pumps to freeze the intercoolers, arm water injection system, 5 seconds before start radiator spray.
with a micro switch on the throttle this will allow to run the engine at 90% throttle to hit 9,000 rpm then to go 100% throttle with water injection.
More later on the story of the NSR150RR that is trying to kill me