Camshaft specs

Advertise with us
Shop deals on ebay
shop deals on amazon
Yamaha Raptor 350 & Warrior Forum

Help Support Yamaha Raptor 350 & Warrior Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
D

dave76

Well-Known Member
Joined
Feb 26, 2006
Messages
2,693
Reaction score
1
Location
Edison, New Jersey
Camshafts from various manufactures with all the timing specs.
Information is compliments of Jasonp.



Web .390" all around cam. Grind number 88. Powroll "torque" cam. http://www.powroll.com/PDF/INSTRUCTIONS/BY PART NUMBER/12742.pdf
.390" valve lift
Duration 276 degrees claimed, Duration @ .050" 244 degrees.
Valve clearance. 004." I/ .005" E
Overlap 36 degrees.
LSA. 104 degrees. Intake 102/Exhaust 106 degrees.
ITDC:20 degrees ABDC:44 degrees
BBDC:48 degrees BTDC:16 degrees
__________________________________
MegaCycle 252x-2 Mid-range cam
Intake .415" / Exhaust .395"
Valve Clearance, I .010"/ E .010"
33 degrees of overlap.
Intake duration is 246 degrees, Exhaust is 245 degrees @.040"
LSA 106 I/106.5 E
ITDC:17 ABDC:49
BBDC: 49 BTDC: 16
_________________________________
MegaCycle 252x-1, or Powroll "mid-range" cam http://www.powroll.com/PDF/INSTRUCTIONS/BY PART NUMBER/12708.pdf
.450" I/E Megacycle. .430" I/E Powroll
276 duration @ .040"
Overlap of 64 degrees.
Valve lash. .006" I/ .006" E
LSA 106 I/E
ATDC:32 ABDC:64
BBDC:64 BTDC:32
_______________________________
Web .430" "race" cam. Grind number 84
.430" valve lift.
286 duration claimed/ 258 duration @.050"
Valve lash, .004" I/ .005" E
50 degrees of overlap.
LSA 104 degrees. 102 I/106 E
ATDC: 27 ABDC: 51
BBDC: 55 BTDC: 23
_______________________________
Powroll "race" cam http://www.powroll.com/PDF/INSTRUCTIONS/BY PART NUMBER/12734.pdf
.430" valve lift
Valve lash, .004" I/ .005" E
80 degrees of overlap.
287 degree of duration intake/288 exhaust @ .040" lift.
LSA 101.5/ exhaust 106 degrees
ATDC:42 ABDC:65
BBDC:70 BTDC:38


Edit by beastly 4/24/23. Adding new cams by DRW
Web 18 grind "DRW XC CAM"

lift 0.440/0.440
Duration 257/257 245/245@ 0.050
LSA 111.5 intake/107exhaust

Megacycle 252x4

Lift .450/.450
Duration @0.040 276/276
Lsa 108/108

Megacycle 252x5

Lift .450/.450
Duration @0.040 276/276
Lsa 112/112
 
Last edited by a moderator:
___________________________
Stock Warrior Cam
.341" lift I/E actual after rocker ratio is .382"
Valve Lash .00236-.00394" I / .00630-.00787" E
Duration 233 degrees @ .40"
LSA 108 degrees
14.5 degrees of overlap
__________________________________
HotCam Stage 1
.394" lift I/E 10MM
Valve lash .13MM I / .15MM E .005" I/ .006" E
250 degrees of duration @ .040" I/E
LSA 107.5 I/E degrees
Valve timing and lift figures include lash
35 degrees of overlap
_____________________________
HotCam Stage 2
.394" lift
Valve Lash .13MM I / .15MM E
262 degrees of duration @ .040" I
254 degrees of duration @ .040" E
LSA 115 I / 104 E degrees
------------------------------------
Web Camshafts 956 grind - torque
.413" lift
Valve lash .004/.005"
Advertised Duration 250 degrees
Actual at .050" 232/232 degrees
LSA 102/106 = 104
24 degrees of overlap
------------------------------------
Web Camshafts 17/88mc grind -top end
.440/.390" lift
valve lash .004"/.005"
Advertised duration 286/272 degrees
Actual at .050" 258/244 degrees
LSA 110
31 degrees of overlap



Sorry I don't have any of the valve timing events for these cams. If any of you guy's have the spec sheet let me know and I can figure out overlap and we can get timing down.

EDIT: after reading the manual today I've found that the stock lift is only .341" NOT .382" !!
 
Last edited by a moderator:
There is somthing about those Hotcams I just don't like, mabe it's the wimpy lift figures and thats why you can theoretically use the stock vave springs (which happen to be ****) even for the stock cam. I would still rather have a .390 Web cam anyday over the Hotcam.
 
Dave the whole reason I'm posting this is to help people understand why hotcams are junk. I want to help are people here and don't want them sticking junk in there engines when there are better products out there for performance.
A couple of things to look at here are lobe seperation of the hotcams and how much actual valve lash they run... Why, well because they take valve timing at ZERO lash and valve lift. Remember that. Figure that in when taking in affect the valve lift and duration! That has a huge effect. Also look at how much lobe seperation they run.. Why do that, well when the valve floats they want the cam to have a wider lobe seperation so that way they don't have and exhaust valve hitting the piston... Believe me they don't do that for performance. Also they can't run very steep valve ramps because of the usage of stock valve springs as Mega/Web, remember the faster you get that valve open to the top of the lift and hold it there and slam it down the better performing that cam will be at making HP and torque.
Dave, do you still have that flow chart I gave you of that head? Even on a slightly ported head there isn't a whole lot to be gained by lifting past .400" of lift (it really levels out).... http://www.geocities.com/kiwi_craig/GRAPH.htm Plus your really going to have to rev the engine to make it use that port or the CFM at the higher lifts.
Any of these are great cam's except hotcams. Remember choose the cam for what RPM your going to riding in most or all the time and you will be a lot happier with the outcome. An example would be I ride in woods 75% of the time and under 5000 rpm. Well a Web .390 or a MegaCycle Mid-range cam would work great and give me more power where I ride the most.
Hope this helps.
 
Make sure to note that Web takes all there spec's at .050" of valve lift and everybody else does .040" of valve lift. So actually it's makes Web to look a little smaller of a cam then it really is.
 
Yeah actually all automotive cam manufactures take the duration figures at 0.50 lift, it give a better overall look at what cam profile is doing. I thought about that myself the 0.40 lift figures make the duration look alot bigger then they are.
 
not sure on the duncan .450 cam i have. i bought it new off of ebay but didnt come with the cam card.? also i dont think they sell it anymore, or at least i cant find it. All i know is that its .450 lift and billet.
 
not sure on the duncan .450 cam i have. i bought it new off of ebay but didnt come with the cam card.? also i dont think they sell it anymore, or at least i cant find it. All i know is that its .450 lift and billet.
Click to expand...

That would be the MegaCycle cam 252x1 race cam. I've talked to Duncan racing and they use Megacycle for there camshafts.
 
learn something new every day i guess. i was not aware of that but i know that it does open the top end up like no other
 
I want a .390 web cam for my raptor but I can only find one for the warrior but for the raptor thre guy said it would work but I wanted to get your guys opinion b4 I get it also will the kibble white springs work for the raptor cuz I can't find the for the raptor ether just for the warrior
 
Just thinking about it, the .390 cam might be perfectly suited to the Weisco 10.25.1 piston.
Click to expand...

I would have to agree with you dave. The higher the lift cam the more static compression you can get away running on pump gas with as the bigger cams starts to bleed off more dynamic compression. This is the reason you loose that low end torque as the cylinder pressure is less with a big cam. I still would have liked to try a Megacycle 252-x1 cam and then go with a 12:1 JE 366cc piston... I bet you could make it work with a dynatek and retard the timing with she starts to run hot... also what plays a roll in this is, what altitude are you at, the higher you up the more compression you can get away with as well(the air is less dense). Lastly bore size is important to. The bigger the bore the more compression you are going to have(get from the piston) then a standard size bore, this is one reason as well I went with the biggest bore I could find. I should have spent more time with this engine tuning program before as I was just worried about cams more then anything and not what was happening with static/dynamic compression and what fuel you could get away with....
 
Megacycle .415/.395" Great torque cam and where more low to mid rpm power is needed.
Web .390 grind 88 and powroll .390" - Great power all around and awesome mid range hit.
Web .430 grind 84 Good mid and top end power with out giving up to much bottom end more over rev power then the Web .390.
Megacycle .450" and powroll .430" Great top end hit and high rpm power but you'll lose a bit on the bottom when compared to the other cams.
 
More HOTCAM info.

This is really interesting to me, others not so much and that's ok. The valve timing figures and lift figures include lash. Which is .13 MM intake and .15 MM exhaust! NOT inches like everybody thinks. So it comes out to like .005" intake, and .006" exhaust. So not only are they taking the timing figure at .040" + what ever lash is then they figure in duration and lobe center. This is honestly very different from what most cam manufactures use. This makes it really hard to figure out what there trying to do or how big the cam actually is. For the most part I'm guessing like what we talked about before. Instead of having a really agressive lobe lift like web or megacycle which have sharper ramps they use less as there using stock valve springs to help keep the valves from floating.
Well either way I still think your better off with something that the other manufactures make.
 
so compare the pros and cons of the Megacycle .415 and the web .390 camshafts, since they are measured differently (.040 to .050) how do they compare to each other?
 
The .390" is going to have more average torque and HP then any other cam. The .415" is going to have more low end torque/HP but give you less HP in the mid to top end. I basically said that a few threads up.
Still both cams are going to have more HP then the stock cam at any RPM point.
 
Just to give an idea on how the cams look in comparison.
Stock/Megacycle 252X1/Powroll full race cam
Picture195.jpg


Picture194.jpg
 
You must log in or register to reply here.

Latest posts

Back
Top