Topic: degree a 41a

[johnyvilla]

I have been trying to square up this 41a on the 836 I am building for a few days now, and its not as easy as I thought it would be. As most of you all know Webcams no longer come with spec cards, but I have been using this post as reference:

http://forums.sohc4.net/index.php?topic=50665.msg537520#msg537520

So from what I understand, I need to square up the intake and exhaust numbers, and my LC should be around 103. So far I have found TDC with a stop and dial indicator, which checks out both ways of rotation. I have measured my lobes with zero lash at .050 inches, from the retainer, and the dial indicator is mounted on the head. The best I could manage was:

intake: open 15 exhaust: 34 duration 237  LC 103.5
          close 42             14             226       99

Any advice to nailing these numbers? I thought as I moved the cam in the adjustable sprocket, the numbers would move in a predictable fashion, but that seem not to be the case. I know Webcams are known for their inconsistency, but I would hope to think my lack of skills\patience is whats really keeping me from dialing it in correctly.

Also, whats the correct way to measure lift? With zero lash at the retainer I measured 330 and 229. That cant be right.

[johnyvilla]

Anyone?

[mick7504]

Here is another link that might help to throw some light on it.

http://forums.sohc4.net/index.php?topic=55839.0

[paulages]

your lobe centers are the most important numbers, as you can't change the lift/duration of the exhaust or intake separately. that said, the math works out no matter how you check it... with .040" lift and .005" lash, or with zero lash at .035" lift. no matter how you measure it, the center will be at the same place and should be your target, unless you just want to verify that the cam is what you paid for.

i like to measure at the lobe and at the retainer with lash and without, to verify that the center is the same even if the variables in the math equation are different.

[KB02]

Here is another link that might help to throw some light on it.

http://forums.sohc4.net/index.php?topic=55839.0

I was going to try and find that for him, too.   

[johnyvilla]

I think I have it close enough now:

ex 41 17 in 17 40

LC 101

duration 236

[paulages]

101 is a bit low for your LC, but it'll probably be fine. your powerband will just be shifted a little lower.

[MRieck]

 That's fine ...the opening #'s and closing#'s are split. I don't like it but that's the way it is with Web......

[johnyvilla]

Yea, I am upset with the lift figures of this cam. I should have spent the extra 75$ on a Megacycle.

[eurban]

Are we saying here that the Webcam camshaft doesn't match up to its specs, or are we also saying that they are not consistent from one camshaft to the next.  The later would be particularly poor. . . .I am running a 41a (new not reground) in my 836 project for over 5 years now and have found it to be an excellent choice for all around performance with the bigbore.  Noticeable top end improvements over the stock cam (I spent a few months with the stock 78k cam prior to engine reremoval and retorque with the new web cam installed) and I couldn't really notice any softening of the low end. At the time, I was pretty much blissfully ignorant to the advantages of degreeing the camshaft and simply installed and enjoyed.  Perhaps you will too!

[johnyvilla]

Well, since Webcam no longer supplies spec cards, I was just going by what another member measured. Against those measurements the cam seems to be a little off. I'm sure I will notice the performance increase, but I am a little ticked  at the lift numbers, as I was on the fence about getting a 63 instead.

[bwaller]

I have a street Web that was also frustrating because of their goofy set-up fiqures, but ultimately delivers nicely. Webcams get flamed for that timing card (or lack thereof) nonsense here. I spoke to an accomplished CB500 racer who always used Megacycle cams, switched to Web and swears by them now.

It may be nearly impossible to ever get a head to head comparison especially on a nice street cam, so bottom line, for the short money these cost, do your best setting the thing up and I'm sure you'll see an improvement and be happy. 

[MRieck]

 Brent is absolutely right in what he said about the price and performance. My big problem is a cam that is supposed to be a .370 lift comes in @ .330 or .340. The Megacycles billets I've used come in at at maybe .005 less than advertised. I've used many Webs (including  one my of bikes) and many Megacycle. I personally think...and this is only my impression...that the Megacycle's lobe separation and lift numbers are more beholding to the original specs. Like I said ...I've had good results with the Webs AND find the hardwelds to be much more close to advertised numbers. I just prefer the variety Megacycle offers in regard to 750 billets as well as the accuracy to numbers.