RC 51 Race Cams to be made - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 96 (permalink) Old 08-21-2011, 08:08 AM Thread Starter
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Exclamation RC 51 Race Cams to be made

Read MORE>>>http://pnwriders.com/gear-parts-acce...race-cams.html

This came from Pacific Northwest Riders.com.
This is NOT my AD!
I'm just trying to help people who are looking for 'Race Track' performance.


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Originally Posted by dragracer1951 View Post
[COLOR="Red"]

I'm going to do a run of RC51 billet race cams.
Mike Valasco called me the other day and asked if I would do a run of billet cams. He has a set of HRC cams but they are cast and quite fragile.
There are 6 sets spoken for at the moment.
They will be made of heat treated 4340. Slotted timing gears with no quietners.
Mike and I are not making a dime on these. what we are making is each of us will get a set of cams. We're doing this because 5 guys that race RC's asked Mike to do it.
I'm meeting with Mike in a day or so to determine prices and which springs and keepers will come with the set.
Those of you that may be interested will know that there are no HRC cams available out there and that the HRC cams are cast and thus quite fragile. There are no aftermarket cams out there. Period...
If you are interested, let me know. The more we make, the lower the cost.
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post #2 of 96 (permalink) Old 08-21-2011, 05:05 PM
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This was from a thread by member mtslesse.
Also additional input was from GennCauley.
Cams beyond the equivalent of Moriwaki Stage 1 cams will require the Moriwaki or HRC valve springs, spring seats, and retainers for the extra lift of Stage 2 cams.
Or course these parts are no longer made, and only obtainable from those selling theirs.

I learned this after I bought my HRC valve train kit.
Since then I've also run bought a Moriwaki valve train kit as well.
So I consider myself quite lucky.

Last edited by SubSailor; 04-05-2012 at 12:13 PM.
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post #3 of 96 (permalink) Old 09-20-2011, 10:00 PM
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Who do I have to get ahold of to see about getting a set of these cams if they are still available?
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post #4 of 96 (permalink) Old 09-21-2011, 08:38 AM
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Quote:
Originally Posted by hondaman417 View Post
Who do I have to get ahold of to see about getting a set of these cams if they are still available?
Kent Cams in England makes both reground OEM cams and billet cams.


The reground cams are similar to Moriwaki stage 1 which means they can be used with OEM valve train.
The billet cams are similar to HRC or Moriwaki stage 2 cams and are to be used with HRC or Moriwaki springs, retainers, seats, etc., which are no longer made and are hard to find.

Also the price is much different of course.
The reground cams are around $400 while the billet cams are around $1600+.
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post #5 of 96 (permalink) Old 12-18-2011, 10:17 AM
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It is not the problem to get the camshaft and the valve train. ( the price is the problem )
The problem lies in the proper installation and adjustment.

HRC camshafts:
The Moriwaki Stage 2 / Kent camshafts are not identical to the HRC cams.
The HRC intake and exhaust cams have more lift, other timing...
In particular, the exhaust camshaft.
It is very important to the proper distance between the piston and valve to be determined.
I had 0,8mm valve to piston clearance on the exhaust side ( race pistons ) This is very scarce. Even with the use of titanium valves is it very scarce.
It would work but certainly the risk that the piston closes the valve is very large. ( Flutter valve )
There is the possibility to mill out the valve pockets.

This problem is not with the Moriwaki cams and Kent cams.
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post #6 of 96 (permalink) Old 12-18-2011, 01:51 PM
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so are you saying that ptv is going to be the issue on every stage 2 style cam setup?
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post #7 of 96 (permalink) Old 12-18-2011, 02:10 PM
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I'm thinking he was saying that if money was no issue, you can always get what you want. Getting them installed shouldn't take some mystical unknown secrets though, anyone with a brain can do it, but once you start messing with the amount of lift (stage 1 cams don't increase the amount of the lift, I'm not sure about the stage 2 and beyond) you can run into issues that the average garage mechanic might not know about before hand. I think that was his point.

For those of use with less than several thousand laying around to dump into an aging slow dinosaur of a bike, the options are very limited as far as power goes. A set of stage one cams will work, but still won't be much of a return for what you might pay. Since none of the top end parts are available off the shelf anymore, custom work or second hand is the only way to go. That will cost more than most are willing to spend. Understandably so.



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post #8 of 96 (permalink) Old 12-18-2011, 02:30 PM
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Sorry for the confusion!

I wanted to say:
HRC and Mori stage 2 cams are not identical.
Mori stage 2 and Kent camshafts make no issue.

The HRC cams are not just plug and play.

Last edited by Jäger; 12-18-2011 at 02:38 PM.
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post #9 of 96 (permalink) Old 12-18-2011, 06:02 PM
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are you on speedzilla.com?
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post #10 of 96 (permalink) Old 12-18-2011, 06:28 PM
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Quote:
Originally Posted by Jäger View Post
It is not the problem to get the camshaft and the valve train. ( the price is the problem )
The problem lies in the proper installation and adjustment.

HRC camshafts:
The Moriwaki Stage 2 / Kent camshafts are not identical to the HRC cams.
The HRC intake and exhaust cams have more lift, other timing...
In particular, the exhaust camshaft.
It is very important to the proper distance between the piston and valve to be determined.
I had 0,8mm valve to piston clearance on the exhaust side ( race pistons ) This is very scarce. Even with the use of titanium valves is it very scarce.
It would work but certainly the risk that the piston closes the valve is very large. ( Flutter valve )
There is the possibility to mill out the valve pockets.

This problem is not with the Moriwaki cams and Kent cams.
Is Kent still making cams for the RC51 (stage 1 or 2)?

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