Need some knowledge about RC engine - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 19 (permalink) Old 07-12-2009, 04:11 AM Thread Starter
 
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Need some knowledge about RC engine

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.
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post #2 of 19 (permalink) Old 07-12-2009, 08:54 AM
 
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Dan Kyle racing could prob get you all the internals for this engine.
One of the members " Subsailor" could tell you what things are made from.
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post #3 of 19 (permalink) Old 07-12-2009, 12:24 PM Thread Starter
 
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Thanks a lot. That should help. i appreciate your time.
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post #4 of 19 (permalink) Old 07-12-2009, 11:27 PM
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The pistons are cast, the crank is forged, the rods are forged and carburized.
Both intake and exhaust are typical steel valve material, not stainless or titanium.

The HRC WSBK spec bike used titanium valves, forged pistons, but used the stock rods.
Carrillo makes rods for the RC51, and are works of art, but way pricey.
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post #5 of 19 (permalink) Old 07-13-2009, 01:24 AM Thread Starter
 
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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.
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post #6 of 19 (permalink) Old 07-13-2009, 01:23 PM
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Not too many companies made parts for RC51 as it wasn't sold in such large numbers as their I-4 bikes to warrant tooling.
You might be able to find someone who's willing, like Manley.
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post #7 of 19 (permalink) Old 09-12-2009, 05:18 PM
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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.
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post #8 of 19 (permalink) Old 09-12-2009, 06:26 PM
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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.
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post #9 of 19 (permalink) Old 09-12-2009, 09:13 PM
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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.
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post #10 of 19 (permalink) Old 09-28-2009, 11:19 AM
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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


http://www.hordpower.com/index.php?m...roducts_id=209
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