Originally Posted by Tony Newland (Post 4246774)

With one weekend of testing I increased runtime on a 7 port by 1:30 minutes in vegas over stock.... just takes some knowledgable tuning, nothing special.... I doubt an out of the box 'any' motor would make the 11+ minutes you have to run in vegas to go without a pit.

There's dozens of variables that play into the runtime external of the engine...driver has a ton to do with it

I've got well over 10 mins on a 50+sec/lap open tracks all over the country with my Vspec...and thats at a good tune, not leaning it to meltdown. There's no 'miracle' engine, never has been, never will be. Practice tuning with a bit leaner bottom than most, a low idle and you'll find your not at WOT nearly as much as running a rich bottom / lean top like most everyone runs.

Originally Posted by Qmartin (Post 4251556)

Ninja's don't have a expoxy'd crank. I'm not defending the GRP cause I don't even know if I'm going to buy one but there clearly not the same as a Ninja.

Originally Posted by CarbonJoe (Post 4251754)

Do the MRTuned Ninjas have an epoxy'd crank?

Originally Posted by Merciless (Post 4251559)

hey, it maybe JUST a Ninja ........ But i like it. Needed a new motor and it fitted the bill. Came with a pipe etc in the box and i couldn't knock the price. It was easy to do the running in, tuned pretty easy although im still rich as just finished the first meet with it. It's as fast as anything else on the track and i was able to do 7min fuel stops with it rich. Didn't have any issue's with flame outs or it cutting out on me !! what more do ya want ?? I'm sure Ninja's are just the same ................

Rod

Originally Posted by Maximo (Post 4251821)

yes they do !!

Originally Posted by CarbonJoe (Post 4251855)

From the picture links posted above, it appears that the new GRP engines are really the MRT Ninjas with a different head and color scheme (and a lower price!). The decals are even the same from the MRT Ninja. They should be killer engines...

Originally Posted by houston (Post 4246281)

kinda funny how much run time you can squeeze out of an engine when you lean it out to 300 degrees and use a 6.5 mm carb restrictor :nod: major runtime !!! and screamin , oh buddy !!

Originally Posted by tallyram (Post 4253036)

i just happen to have a new ninja bo1a piston and sleeve set sitting in front of me and they are identical to the grp parts! i know the mrt ninjas had the epoxy filled cranks and magnesium heads, but what else was done to these engines?

Originally Posted by ezveedub (Post 4254926)

I think the first Ninja sleeves didn't have any angled cut ports. I remember looking at mine when I had it apart, it it looked like just plain port cuts, no angled in cuts from the bottom. I also remember someone stating Jim at fusion said they were pretty rough cut also. Maybe the new sleeves have more work done on the ports.