Hey guys, I'm getting a new engine for My Kyosho Ultima ST because the old engine is running dead and instead of replacing the sleeve and piston I'm getting a whole new engine. The ones I was looking at were both O.S., the [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXXA43&P=0]O.S. .12 CV-RX (S) w/10ER Rotary Carb[/link] and the [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXBWK5&P=0]O.S. .15 CV-RX (S) w/10ER Rotary Carb[/link]. I'm looking for more power but they both look to be nearly the same (besides the displacment) but is it worth spending the extra $35 on the .15?
I was also looking at one other engine, the [link=http://www.ofna.com/eng-picco7port.html]OFNA Picco .12 7 Port SG Shaft[/link], is that a good engine? If anybody knows any other good engines with a short shaft (I don't really care about the carb) could you please put them here?

Thanks guys! (O and sorry this is so long)
Matt

O.S. .15 CV-RX (S) w/10ER Rotary Carb is a good one.

Well if your bashing get the .15 engine. If your racing get the .12 because it is legal for racing.

Wow thats a fast reply, I just posted this about 10 min ago, anyways I might be racing later on but right now I am just bashing, is there any noticablt power difference?

Thanks again,
Matt

You will have a bout the same speed with either. Its just that the .15 will be quicker of the line. ( by just a little bit though)

Well since I am going to be racing later on I should get the .12? Does anybody know about the OFNA one?

Thanks guys,
Matt

Oops, forgotnto add this to my other post, how much is a little bit? and do they both have the same top speed?

Sorry 'bout that,
Matt

whatever engine you get, get slide carb. it so much more acurate.

Hmm I kind of need to change my original question...What high performance engines are good that have the short shaft (in other words anything that will fit in the rc10gt)?


Thanks everybody,
Matt

if your looking to race then you should get a .12 and the 7 port is illegal i think. the comment made by XXXNTFREAK is kinda in acurate(at least what i got out of it). slide carbs have good low and high end responce but lack mid range responce. rotary carbs have better midrange and are used alot in off road. slide carbs are used more in on road. have you looked at the fantom .12? im not sure weather if the crank shaft is right but its a great engine.

Everyone brings up the issue of the .12 being legal for racing and that's true if your running R.O.A.R. events, or your track follows the same rules. The truth is most tracks will let you race with a .15, or .18 engines, especially in the novice and intermediate class. Very few tracks that I've run across even checks your engine. The strictest track I've been to, only checks the "A" class trucks for engine size. In your case, I'd go with the .15.