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Riggs Performance Grind Re-Phased Camshafts
- Thread starter mrriggs
- Start date
mrriggs
XS650 Junkie
Which cam are you running?
All you really need to know is the lobe center specs. The lobe center (intake and exhaust) on a stock 447 cam is 106 degrees. For the stock 256 cam it's 100 degrees intake, 99.5 exhaust. On the Shell #1 it's 100 degrees intake and exhaust.
mrriggs
XS650 Junkie
I now offer a reground cam with the specs of the early model (256) cam. It's the same deal as the Shell #1 cam I offer. It's $100 if you send me your cam, and I'll re-phase it for another $100. You will need to degree the cam before running it. The lobes are ground to preserve as much of the base circle as possible so the sprocket may need to be reset to time it correctly. Yes, that is more work, but I guarantee you will not get a cam that is so over-ground that there are no threads left on the adjusters for the lock nuts.
The 256 grind is a great street performer. Better punch than a 447 and better longevity than a Shell #1. Plus, you can run the stock valve springs.
The 256 grind is a great street performer. Better punch than a 447 and better longevity than a Shell #1. Plus, you can run the stock valve springs.
mrriggs
XS650 Junkie
Yes, the cam SHOULD be at full lift but it doesn't always work that way. It's better to calculate the lobe center [based on the open/close events] than it is to try and measure it directly. To calculate the lobe center; add the open event to the close event then add 180. That gives you the duration. Divide the duration by 2, then subtract the event closest to TDC.
For example, the intake events for a 447 cam are 36 BTDC and 68 ABDC.
36 + 68 + 180 = 284
284 / 2 = 142
142 - 36 = 106
Depending on what lash and valve lift you used, your events and duration may be completely different than above. However the lobe center should calculate out the same.
mrriggs
XS650 Junkie
I am not doing cams at the moment but plan to offer them again when I get caught up on some of my shop projects.
My other hobby is old machine tools. I've drug home a bunch of them and have been fixing them up one at a time, then using them to fix up the others. When I finish the one I'm working on now I will retool the cam operation to take advantage of the "new" machines.
All of my re-phased cams are machined, not welded.
mrriggs
XS650 Junkie
I retooled over the weekend and have two re-phased 447 cams available now.
mrriggs
XS650 Junkie
The two I have now are both stock 447 profiles, they have not been reground.
I can have one ground to whichever profile you prefer for an additional $100.
RebelClassCycles
XS650 New Member
I'm interested in a performance rephased cam. I'm lost when it comes to getting my cam degreed though. It makes sense to me that you need to degree it but sounds like a head ache. Is there anyway you could degree it for me?
Punkskalar
Hugh's HandBuilt
There is no way to account for deck height, gasket thicknesses, camchain stretch/wear... All of this changes the height from the crank centerline to the cam centerline. That difference in height can and will change the degreein'g of the camshaft since the chain is a fixed length. I degree ALL XS650 cams, it's a bit confusing, but not too hard to do really...
RebelClassCycles
XS650 New Member
So really there is no drop in performance cam. I'll have to read through that link of doing the process and see if it clicks more. This my first project that I'm really doing extensive engine modification so some of this is pretty new to me. Thanks for the reply Hugh I'm still planning on getting my crank done when I pull my motor apart. If I'm going to do a rephase I would like a better cam. I like the best and this can be a good and bad thing in life. Like never getting your bike done haha.
