RPM Range....

[Ranger976]

Hello everyone! :) Have finished with the lastest mods to my 85 2.4L 200 ie; reeds, tuner, head compression bump to 148-150. removed the oil injection to pre-mix. The question I have is what are the Max RPM's I should be targetting with these mods? Is my RPM Max limited soley by props and set-up or is there a rev limiter on this mota. I have been told that this mota will run 7000 all day long:cool: . The engine has been running rich....so I have rejetted from a 80 to a 78. Holes #2 and # 5 had 82's in them which I came down to an 80 on. Do these normaly run hotter than the other holes? I'd like to get this rig running in the upper 70's or 80's :eek: if possible it's on a 19ft Hydra -Sport fishin' rig. I might be dreamin...any thought's or info is greatly appreciated..Thanks Jim

[pyro]

The mods you mentioned aren't going to change the peak output RPM range, which is still realistically 6000-6400. Reeds may help idle. Tuner won't hurt, probably won't help either. The extra compression will help bottom end and midrange pull quite a bit. It may also allow you to "prop up" a pitch for top end. There's no reason to run WFO with any prop that will allow it to turn over 6500, except for short bursts with a low-pitched stump-puller prop. A taller prop that tops out under 6500 will likely be the faster prop, rather than a pitch or two down that tops out at 7K. The motor just doesn't have the porting to make good HP in that range. When I had a stock 2.4 200 (efi), my fastest runs were in the 6300 rpm range.

After the mods, you may be able to turn a taller wheel. Watch out with the jetting, because a taller prop will load the motor down more, and it will run a lot hotter as it pulls through the midrange.

[Ranger976]

Thanks for the info....will be starting with a 25P turbo lightning from my other boat to get a starting point... have a 21 also but in relation to what your saying it's most likely not going to be enough....have a 29P TXP :eek: but believe that's going to be to much....as soon as the freekin' ice get's off these lakes..... the water trials will begin...Thanks again Jim

[hsbob]

that 26 is going to be too much. look for a 23 tempest ot turbo. i like turbo as the are as good as trophy in reducing chime walk. be sure to have extra cupping added.