Read MORE>>>http://pnwriders.com/gear-parts-accessories/148679-rc51-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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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.

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.

Who do I have to get ahold of to see about getting a set of these cams if they are still available?

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+.

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.

so are you saying that ptv is going to be the issue on every stage 2 style cam setup?

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.

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.

are you on speedzilla.com?

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)?

There is a member on speedzilla that I have been in contact with that has some that I plan on picking up
Mori / Kent stage 2
billet cams. Adjustable cam gears. Springs, seats retainers.
12,4mm intake lift and 11,9 exhaust lift ( oem 10.5mm lift in and ex )
Timing:
105° in
107° ex

I have also been chasing these. What is the prices?

you ready?
2400

What is Kent selling theirs for?

these are kents

Kent put me in contact with Revolution Race who has a full set of cams and valve train for 1700 GBP (about $2638).

wonder if that is the same set?

These are some of the response he sent me


Thank you for your enquiry
I am sorry to say that after Stage1 there is nothing about except the race spec camshaft. This camshaft is used in the UK by a number of Trackday riders as well as twin class racers often with JE pistons. This configuration with a Moriwaki or similar pressurrised airbox produces in excess of 150bhp at the rear wheel.
This camshaft requires a special valve spring kit that comprises of springs, base plates and spring caps. It is only sold as a complete kit.

The cams are not Moriwaki Stage 2 cams. They are a special designed race billet cam and they do have slotted adjustable camwheels. If the cam timing is set between certain recommended perameters there is no danger of the valves hitting the pistons. The piston valve clearance at the closestrecommended valve timing is INLET 1mm and EXHAUST 1.3mm at the other end of the scale it is 1.2mm and 1.5mm. Either of these figures is a safe clearance and is in used on about 35 bikes in the UK and as many in Europe without any failures.

that sounds like them!

Read MORE>>>http://pnwriders.com/gear-parts-accessories/148679-rc51-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.

Hi interested in the billet cams please can you provide an idea of cost & postage? Thanks

damn they are pricey.... almost 3 grand for the hrc throttle bodies and stacks. and almost 3 grand for cam setup?? for that price I could buy a built gsxr 1000:mad:

yep, don't forget your unobtainium valvetrain for stage 2 cams. The valvetrain alone cost me over 1000....used, and i still ahve no stage 2 cams.

Stage 1 cams maybe be available for all soon too. i'm working on that one, and would be more logical for most guys.

I was thinking about having my valve train parts copied

I was thinking about having my valve train parts copied

You should, maybe i should do the same. do you have cams too? Would be cool to do it through the same company so guys wanting stage 2 can buy a whole kit. Valvetrain and cams.

What Valvetrain do you have? the HRC or Moriwaki? i have the HRC one. i foget what company it is, but i had titanium retainers made to HRC spec for my valvetrain....it was expensive. i think i bought 24 to have spares and it cost me 600.:eek:

Is it possible to get HRC throttle bodies and stacks still? or was that an ultra rare find?

rare find. there is one for sale though. Problem is you need the ECU/CDI, harness, and tuner box to make it work right. These TB's were not designed for our bikes, they were designed for works bikes which have nothing in common with ours. The heads ont he works bikes were very different then ours.

I see. One more question if you don't mind, Why do the HRC cams work in OEM heads if the HRC heads were different? As I have never seen a picture of the inside of HRC heads.

thanks

You should, maybe i should do the same. do you have cams too? Would be cool to do it through the same company so guys wanting stage 2 can buy a whole kit. Valvetrain and cams.

What Valvetrain do you have? the HRC or Moriwaki? i have the HRC one. i foget what company it is, but i had titanium retainers made to HRC spec for my valvetrain....it was expensive. i think i bought 24 to have spares and it cost me 600.:eek:

It's Kibblewhite Precision Machining that made the titanium retainers.
Slightly heavier, but far more durable than the aluminum Moriwaki or HRC retainers.

...I have never seen a picture of the inside of HRC heads.

Knowing HRC, you probably never will.

1)

There is a member on speedzilla that I have been in contact with that has some that I plan on picking up
Mori / Kent stage 2
billet cams. Adjustable cam gears. Springs, seats retainers.
12,4mm intake lift and 11,9 exhaust lift ( oem 10.5mm lift in and ex )
Timing:
105° in
107° ex

Sorry if this is a silly question, but i am confused a bit.

According to the manual, stock cams lifts the valves at 1mm height.
That means that the lobe has a 1mm lifted nose from it's circular circumference.

http://i39.tinypic.com/2zjkr46.jpg

If a staged cam adds 10 or 11mm height on the valve lift, isn't that "too much" for the stock pistons to heads clearance?

2)

These are not the ones talked about on Speedzilla or the RC forums.
I know the person that has the masters for the HRC cams.
They will be in three configurations.
They are:
.420 lift 258 deg duration @ .04 lift
.470 lift 274 deg duration @ .04 lift
.495 lift 282 deg duration @ .04 lift

There is the posibility of doing another option of .47 lift and 258 deg duration

All but the .420 lift will require springs and retainers.

Are these measurements in inches? I am asking that cause 1mm = 0.03937 in
Something I don't get right, maybe?

You should, maybe i should do the same. do you have cams too? Would be cool to do it through the same company so guys wanting stage 2 can buy a whole kit. Valvetrain and cams.

What Valvetrain do you have? the HRC or Moriwaki? i have the HRC one. i foget what company it is, but i had titanium retainers made to HRC spec for my valvetrain....it was expensive. i think i bought 24 to have spares and it cost me 600.:eek:

I have the Roger Ditchfield cams which were made for him by Kent Cams.

1)



Sorry if this is a silly question, but i am confused a bit.

According to the manual, stock cams lifts the valves at 1mm height.
That means that the lobe has a 1mm lifted nose from it's circular circumference.

http://i39.tinypic.com/2zjkr46.jpg

If a staged cam adds 10 or 11mm height on the valve lift, isn't that "too much" for the stock pistons to heads clearance?

2)



Are these measurements in inches? I am asking that cause 1mm = 0.03937 in
Something I don't get right, maybe?

On your screen cap, the intake valve will have 1mm lift with the piston at 20 deg BTDC.
At 50 deg ABDC, the intake valve will have 1mm lift.
For a total intake duration of 270 deg.

The exhaust valve will have 1mm lift starting at 50 BBDC, and at 20 deg ATDC.
And will have 1mm lift at 20 ATDC, also for a duration of 270 deg.

With the intake closing at 50 deg ABDC and exhaust opening at 50 BBDC, the intake/exhaust overlap is 100 deg.

For second portion, values are in inches.
.420" = 10.668mm
.470" = 11.938mm
.495" = 12.573mm

.04"= 1.01mm

On your screen cap, the intake valve will have 1mm lift with the piston at 20 deg BTDC.
At 50 deg ABDC, the intake valve will have 1mm lift.
For a total intake duration of 270 deg.

The exhaust valve will have 1mm lift starting at 50 BBDC, and at 20 deg ATDC.
And will have 1mm lift at 20 ATDC, also for a duration of 270 deg.

Sorry but I think I don't get something right.
The exhaust valve opens 50 deg BBDC and closes 20 deg ATDC.
That means
20+180+50= 250 deg.
Same thing with the intake valve.
What I see though is that the intake valve opens 20 deg BTDC while the exhaust valve is already open. Exhaust valve closes 20 deg ATDC.
That makes us 20+20= 40 deg overlap.

http://i39.tinypic.com/2eksn80.jpg

What am i doing wrong and can't find the same numbers as you did?

With the intake closing at 50 deg ABDC and exhaust opening at 50 BBDC, the intake/exhaust overlap is 100 deg.

For second portion, values are in inches.
.420" = 10.668mm
.470" = 11.938mm
.495" = 12.573mm

.04"= 1.01mm

Thanks Sub....http://smiles.kolobok.us/big_standart/cool.gif