Hi Darling, Congrats for your big win on 3rd DTM-JITC 2005.
Your "prototype engine" is perfect for your smooth driving style.
Awesome mid to high power.
Can wait to see your action in upcoming nats...

Thanks, yes I ask him why is my engine has awesome top end but just average bottom power. The answer is you want low power use 3 port instead of 5 and only use JP Racing pipe to get the best out of it. Haha simple...

Can't wait to pitting for you in the upcoming nats

Thank you.. you mean with "that" engine ??

while breakin in a few of my new motors I managed to track down a cheap cheap new piston and sleeve set for my old faithful jp black mod. the new sleeve is a non modified novarossi job. I was wondering would it be possible to replicated the sleeve modifications diy style which were carried out by jp on the old sleeve?? This motor will be a backup, but it would be cool to get it running as fast as it did b4.

cheers

I've tried putting NSR piston and sleeve in a black JP without success. I couldn't figure out why the engine would run very fast and all the sudden slow down to a point the car won't shift to 2nd, and then very fast again, all in the same tank without overheating.

this isnt a later ns or nsr sleeve though, not sure why you mentioned that

I guess I'd like to know if you have any success there. Another friend of mine swapped the P/S of his JP and couldn't get it to work right either.

he he, your a very positive guy. thanks for the help

Mine is okay...... hhmm, what do you mean with black JP ? Is it JP FX5 ?

I give my FX5 new lease of life with complete p/s/r from novarossi nsr s5.

ASW7576 had done it several times. At least his engine still run fast enough(not as fast as original JP). PM him for the equipments he used for it. I once swapped P/S Berelium from Palmaris, and the engine works great until now.

Yeah it was a FX5. I just couldn't get it to work right with p/r from NSR S5.

The new style of JP engines is in production!!
Just look for this part number...

So basically you tried the swap with a newer engine and sleeve and also a more unforgiving 5port setup, why was that relevant at all??! If you had said you had tried a stock RS12 3port sleeve in a jp black rs12 modified 3port engine and it didnt work then fair enough, cant see why it wouldnt though.
Ive measured it up and as suspected the timing of the boost and transfer ports are the same, the port sizes are all the same to. the only difference is the chamfered bottom edges of the boost ports which help smooth the flow of air and fuel from the crankcase and the long grooves to better guide the intake charge as it enters the cylinder.
The fact that asw used the same sleeve in the same engine as you and it worked makes me think your problem was down to another course. you should get reduced performance not drastic running issues as the modifications on these jp sleeves are more for flow not drastic timing adjustments.

Hesky, it was a JP FX T-05, the latest JP Black engine. It has the same dimension as the NSR S5. I am just offering my experience, as most people are here in the forum. I didn't tell you what to do, or for that matter of fact what not to do, so what's with the hostility?

no hostility jeff I guess I should just try it and see how it works and go from there. The thing is 3port and 5port motors are completely different animals and you cant really compare one to the other.