KB .18

[_laxmasta2039]

hey,

any nitro gurus out there want to try to see what you can do with a KB .18 inboard? B)

depending on what you can do i'd probably be willing to pay you for your time just to tinker around.

 

[izitbrokeyet?]

Joe,

I've modded one for buggy use. The best thing you can do is to provide a channel in the sleeve so that the piston port actuallyworks. It's a schnurel motor, so ther's not much you can do with the ports except to raise the timing a tad. There's a little more that can be done with the crank and the clearance to help also.

 

[Scott Schneider]

Sounds like fun !! I don't build engines for hire any more but how difficult can a little .18 be? to be honest with you flow improvment in the cases and some exhaust & intake timings should be about it.

<_< I really doubt it will ever be any thing close to a race bred .21 with 3cc's less.

Let me know, I am in California. Scott

 

[_laxmasta2039]

k thanks guys....

yea i know it wont ever be nearly like a .21, i just wanna have somthing with enough power that it'll be worth putting in a boat.

kevin,

how much improvement did your buggy engine get with tha mods?

Joe

 

[izitbrokeyet?]

Joe.....It wasn't much. I'd guess the power increase to be in the neighborhood of 5-10%

 

[_laxmasta2039]

oh, well in that case i guess ill just run it stock...does it run anywhere near as well as a good .12?

 

[izitbrokeyet?]

Joe,

I think you will make many more revs and more power with a rossi or novarossi .12 than you will with the K&B .18 motor. It has some issues that will keep it from being a very good motor.

 

[izitbrokeyet?]

I should also mention that some of those little .12 motors have ALOT of pep for their size. If you are going to go .12....I'd recommend the Rossi Pixi .12

 

[_laxmasta2039]

kevin...ill keep that in mind, dont wanna spend money on an engine till ive got a boat that i know works well, this is my first attempt at an inboard rigger and it's just a scratch-building project.