Cam Weights - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 10 (permalink) Old 07-25-2015, 03:00 PM Thread Starter
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Cam Weights

I've heard of guys (here in America) taking the cam weights off the cam gears. I see the obvious advantages, less rotating mass, quicker revs, and theoretically more power. anyone done this? any side affects? Are the weights for balance or to simply "de-tune" the engine for road use?
I ask, because I love my RC and want to start pulling as much power out of this platform as possible. But, this is not a track bike, this is my daily ride. So longevity and reliability are paramount
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post #2 of 10 (permalink) Old 07-25-2015, 04:22 PM
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"want to start pulling as much power out of this platform as possible. But, this is not a track bike, this is my daily ride. So longevity and reliability are paramount".

My advice, which is advice I should have listened to as well....LEAVE THE THING ALONE OR YOU'LL END UP LIKE ME, with some shop fcking the entire engine up...just another 6 g's or so, and a shipment to the UK on top of the original 5 or so and I'll have it sorted out...It ain't worth it.....

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post #3 of 10 (permalink) Old 07-25-2015, 04:54 PM Thread Starter
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Sooo you're saying PC5 and call it a day... Gotchya.
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post #4 of 10 (permalink) Old 07-25-2015, 05:32 PM
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exhaust airbox..external mods.....I got into trouble with a shop that was supposed to be familiar with the RC 51 but couldn't time the new, kent cams correctly and thus bent all my ceramic coated valves and lost 6 months of time.

It seems the cams are where the power lies but where the problems lie also....even John Ethel, nikky haydens old works bike mechanic deferred to roger ditchfield to rebuild my engine due to the fact that John is used to dealing with HRC/works parts and not aftermarket. It just seems like it's difficult to finding someone who is honest and talented enough to work on the internals correctly.

I'm getting close to the 1 year mark and all I wanted was a built engine...lol....do as I say, not as I do.
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post #5 of 10 (permalink) Old 07-25-2015, 09:24 PM
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I'm guessing that box has your engine in it on it's way to Roger, looks good.
Funny thing, before I sent my heads and lower case to Roger I thought about sending my complete engine to him and he said,
" Saran wrap (the heavy duty freight type) the engine to a used car tire and good to go."
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post #6 of 10 (permalink) Old 07-26-2015, 06:54 AM
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LOL..yea Roger's a great guy but in some ways a little different...definitely brilliant.
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post #7 of 10 (permalink) Old 08-08-2015, 04:55 AM
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Quote:
Originally Posted by Csoll13 View Post
I've heard of guys (here in America) taking the cam weights off the cam gears. I see the obvious advantages, less rotating mass, quicker revs, and theoretically more power. anyone done this? any side affects? Are the weights for balance or to simply "de-tune" the engine for road use?
I ask, because I love my RC and want to start pulling as much power out of this platform as possible. But, this is not a track bike, this is my daily ride. So longevity and reliability are paramount
Do you mean the cam quietening gears? I wouldn't bother, I removed them from my track NC35 and there was no discernible performance gain and that's on a 60 hp bike.
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post #8 of 10 (permalink) Old 08-08-2015, 12:47 PM
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The cams only rotate at 1/2 crankshaft RPM so not much rotational mass to be eliminated.
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post #9 of 10 (permalink) Old 08-09-2015, 02:45 PM
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Ive done the mod long time ado, takes off roughly 1 lbs worth of weight, cant say I see any advantages or performance gains but it is 1 lbs off the engine. There has been some members long ago mentioning that because of engine harmonics at high revs the cams in minor cases have snapped.

Personally I wouldn't really bother, if one day I build a motor for my RC I would leave them in...
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post #10 of 10 (permalink) Old 08-09-2015, 10:23 PM
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Ive done the mod long time ado, takes off roughly 1 lbs worth of weight, cant say I see any advantages or performance gains but it is 1 lbs off the engine. There has been some members long ago mentioning that because of engine harmonics at high revs the cams in minor cases have snapped.

Personally I wouldn't really bother, if one day I build a motor for my RC I would leave them in...
That may have been me a number of years ago after I was following a discussion elsewhere.
From information obtained later, it was determined that was incorrect information and should be disregarded.

The OEM cams are cast, and if welded and reground for added lift and duration, the cams can't handle the rotational torque stresses and snap.

For performance at high lift and duration, billet is the way to go, such as Kent Cams billet adjustable race cams from the UK.

Last edited by SubSailor; 08-09-2015 at 10:26 PM.
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