Cam gurus- Thoughts on the specs of this cam.

[Tim Ayers]

Some of you may know from my previous posts, I'm a cam nut. Not sure why camshafts fascinate me so much, but they do. I'm also slowly working towards designing my own cam, but that's a thread for another day.

I took a chance on this freshly ground cam on Ebay and I got it for a great price. It was ground on a super nice core.

What intrigued me was that that the exhaust & intake timing events seem to be similar to a Merc. cam, but this grind has much more duration and lift than the Merc.

Here are the specs at .050"

Intake opens: 10 degrees
Intake closes: 50 degrees
Exhaust closes: 10 degrees
Exhaust opens: 50 degrees

Duration is 240 degrees @ .050"
Lift is .380" I & E
110 degrees lobe separation.
20 degrees of overlap

Putting the specs into the Tilden Technology cam lobe data spreadsheet, it seems like it should be a fast action cam.


Curious on your thoughts.

[FritzJr]

Are you sure that the 240 degrees of duration is at .050 lift? That seems pretty stout.

[cadillac512]

Although the 10/50 50/10 valve events mimic the 8CM cam, the 8CM is at advertised opening rather than at .050". I wonder what the advertised specs are for this one....can't have both advertised and .050 specs the same. This cam may have fast or slow ramps depending on those specs....
240 at .050 is a pretty hot cam, as Fritz said above. Hmmmm....

[big deuce]

That's just a frog hair beneath the 400jr... wish I was your neighbor. Sick of hearing 2 stroke 4 wheelers in this town!

[outlaw]

Please post a pic. I would like to see what the ramps look like.

[Tim Ayers]

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I'll post a copy of the timing card and the lobes. I didn't think to compare it to 400Jr. which I also have in stock.

[glennpm]

I made up this cam wheel a few years back. The jpg of my spreadsheet lists the data used.

[Tim Ayers]

Here is the timing card and pictures of the lobes.

I spoke to the grinder this AM, here is what he said:

That grind is a moderate street performance grind that will have a little bit of a rough "lopey" idle. It's a very popular grind.

Makes sense given the somewhat similar timing events to the Merc cam.

[big deuce]

Tiltech 8cm plus? With more lift?
The 240 may be advertised, and not @ .050?

[Tim Ayers]

Originally Posted by big deuce

Tiltech 8cm plus? With more lift?
The 240 may be advertised, and not @ .050?

I thought the same regarding the Tiltech 8CM Plus. That's what drew me to the cam when I saw the timing events.

Card says 240 @ .050". I guess you don't really know until you spec it out with a degree wheel. I'd hope the timing card is accurate.