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Old 08-23-2017, 08:06 AM
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eschaider eschaider is offline
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Join Date: Feb 2006
Location: Gilroy, CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4.6
Posts: 966
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Originally Posted by FatBoy View Post
I've never had to spec a cam before, so are you able to elaborate a little please?

"more split between the duration" does that mean more or less duration, or something else?

With regard to the lobe separation, do I need to be looking in the 110-112 region? What does changing the lobe separation do and is it the inlet that is opening later, or the exhaust that is opening sooner or a bit of both if I reduce the LSA?

Whilst I'm more than happy to accept your experience, I do like to understand why I'm doing something.



I have attached a zip file with a browser application (runs like a page in your browser) that will help you visualize the effect on opening and closing events that duration, centerline and LSA (Lobe Separation Angle) has.

The app was written by a good friend of mine, Mark Olson, and is free for all to use.

Installation procedure:

Unzip all 4 of the files in the file into the same directory.

The files are:


How to run the program:

Make sure Javascript is enabled in your browser's options.

Double-click on either of the .htm files.

If the browser asks if you want to "allow blocked content", run a script or allow an active control, click "yes".

The app essentially lets you create a cam card for any cam you wish to that will illustrate the effect on valve opening and closing points that duration, centerline and LSA have.


Ahhhh, the forum will not allow zip files greater than 39KB. This zip file is 745KB. PM me an email address and I will send it to you by email.

BTW this is what the output looks like. For some reason the CC image comes up fuzzy but the actual screen image is sharp.

Help 'em do what they would have done if they knew what they could do.

Last edited by eschaider; 08-23-2017 at 08:17 AM.. Reason: Spelling & Grammar
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