Hello. This is the first time joining a forum. I am getting ready to build an engine for a 2003 RC. I am trying to nfind out if any one out there knows what materials the internals are made of. For example, are the rods, pistons and crank cast or forged? I'm also trying to find out if the exhaust valves are made of stainless. And also, does anyone make good hardcore rods for this bike. Thanks to all that can help me with these questions. Thanks a million and ride safe.
Thanks again guys. you have been very helpful. It looks like the only thing I have to get would be forged pistons. I called Ross Pistons and they said they could make me a set of 8.5:1 for $101 apiece. Pretty cheap for a custom forged piston. Figured I would throw that out there if anyone on here is ever looking for custom pistons. Is there any companies that make stainless valves for this bike? Once again, thanks for the time taken to help out the RC newbie. These things are 100% wicked.
Why wound't you go with hi compression pistons in the order of 10:1 or 11.5:1? Most current Hi power vee engines are running those pressure levels.
Can't these engines take the extra pressure and heat?
Do these engine typically run hot?
I see where people are doing radiator mods to extra cooling.
I would think that Honda chose 10.8:1 as a compromise that could operate with 91 octane non-leaded fuel.
The reason that today's v-twins such as Ducati 1098/1198, or KTM RC8/R can run fine on non-leaded fuel with higher compression ratios is due to extremely careful cylinder head/piston design coupled with more advanced ignition and fuel injection systems.
Could Honda do likewise with today's technology? Absolutely.
Their RC51 race bikes ran 12.8:1 compression.
I don't think these engines run any hotter than others on average. The use of two radiators mounted on the sides rather than a large slab in front may make then a bit inefficient in traffic, but once rolling they flow air with no problem.
This summer, the warmest my engine got to was 220 deg. F, and it quickly cooled down to 209 once the fans ran a short while.
Someone told me that removing the right radiator fan actual made the bike run cooler because that side pulls hot air from across the engine to blow through the radiator. That doesn't make any sense to me. Even hot ambient air drawn across the engine is cooler than 220 degree water so there should still be some benificial cooling. He said it was a common modification on the RC51's.
Ever heard of that?
I've seen after market carbon fiber fan shrouds for these bikes and sometimes they remove the side radiators and install a large front radiator. I get the impression they run hot and I'm worried about buying one. I don't know anything about the Rc51's.
i don't know if anyone here has used this builder --- but this is where i'm going to get my porting done --- he has all the numbers to back him up --- if U check out his full mods for his motors --- he can build U a 160hp rc51