supra5677
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posted December 16, 2005 11:14 AM
to Y2k...I got your email on you cam specs... Confirmed .310 intake and .295 exhaust.. Its time for me to get a valve adjustment anyway .. when I have the cams out I'll have them measured again...
supra
   
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Y2KZX12R
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posted December 16, 2005 12:47 PM
Ok, so the cams they list as stock, are for a stock engine with stock pistons i guess.
One problem thou. Be carefull, my bike the intake cam was at 102.5 from the factory and the bikes piston to valve clearance on the intake side was .022" kinda scary. Ant not enough clearance for those "stock" cams listed without retarding the intake cam.
Of course if your running aftermarket pistons with deeper valve reliefs it shouldnt be a b problem.
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Y2KZX12R
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posted December 16, 2005 12:53 PM
supra, i ment to tell you ... I dynoed several different cam timing settings on my 12r and the peak power didnt change much just a few hp but the torque between 3000 and 7500 changes alot. that was with stock cams.
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TRNorBRN6001
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posted December 16, 2005 01:53 PM
Whats the scoop on the Muzzy cams they seem to have
a high lift, but not as much duration. I think 10.2mm (.401")
and 253 @ 1mm (.0393)
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Y2KZX12R
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posted December 16, 2005 02:07 PM
I think Doug could tell ya how they developed those cams.
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TRNorBRN6001
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posted December 16, 2005 02:57 PM
Do tell, as they are very proud of them with that price.
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dougmeyer
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posted December 16, 2005 05:32 PM
The cost of those cams has almost nothing to do with their shape. It's a direct result od the costs involved to have them ground and heat treated. It's a quality thing.
Doug
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Y2KZX12R
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posted December 17, 2005 01:36 PM
Doug, so are you saying that the different cam makers dont all use the same proccess or as good of a proccess as muzzy does?
Also, did you guys try several grinds before deciding to go with the cams you offer? Or did you use software or extensive knowledge to just pick a grind that you knew would work well?
I'm just curious as to how you decide to sell a particular grind, and how many grinds and timing settings you dyno and actually run?
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dougmeyer
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posted December 17, 2005 02:54 PM
The fact is that there are only a couple places in the U.S. that are equipped to "do" motorcycle cams. It's different from the car market because of the low volume and small size. There are different processes to choose from and all retail vendors do not employ the same manufacturing processes. So sure, everyone's costs are not the same.
I think it's safe to say that all the best cam offerings are a result of good predictive designs, tested, redesigned, and tested again until the best results are acheived. Also remember that aftermarket cams are "redesigns" of stock designs changed to remove the compromises that are inherent in a "stock" engine. No magic there, but the more designs you work with, the more knowledge you accrue of what works and what doesn't.
D.
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TRNorBRN6001
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posted December 20, 2005 07:35 AM
Web cams $619, Muzzy cams $899 almost a $300 difference. One product
must be inferior to another or someone is very proud of thier cams.
How do they make the cams? Weld on them and re-grind? As some require
a core i believe.
I kind of like that high lift and moderate duration the Muzzy cams offer, but
that price will bust your nut, especially their valve spring kit too.
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Y2KZX12R
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posted December 26, 2005 02:18 PM
Doug, what are the guys at Muzzys reccomending for cam timing on the stock cammed 1375?
What cam grinds have you tried yourself?
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dougmeyer
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posted December 26, 2005 03:09 PM
I don'r know what they're currently recommending. I've used the Muzzy cams and, before they were available, a one off set that I had done based on some four valve car designs.
(F-Atlantic and Sports 2000). The Muzzy cams were in the 205 hp 1340
BTW, Y2 I'm still looking for the stock cam profrile printouts for you.....They're around here somewhere.
D.
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Y2KZX12R
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posted December 26, 2005 04:44 PM
Thanks Doug, I've been crunching lots of numbers from valves to cams, to exhaust pipes to intake stacks etc. for 2 days now. I'm starting to draw some conclusions about the direction I want to go with the cams and head for the 1375cc setup.
The stock dia. intake valves dont become a flow issue untill about 15,300 rpm with 1375cc.
The exhaust port is going to need some work to suport the 1375.
An intake cam of about .362" and 249 deg., and an exhaust cam of about .355 and 248deg.
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