OM617 (non turbo) cam profile specs, piston height specs etc - PeachParts Mercedes-Benz Forum

panZZer · #1 12-20-2010, 06:41 PM

Quote:

Originally Posted by DeliveryValve

At the beginning of this year I got in contact with Geoff Bardal at Colt Cams in Aldergrove, British Columbia Canada. I was led to his company through the Volkswagen TDI circle in which he makes a performance TDI profile that people have had good reviews on. He also has done thousands of profiles on various gas and diesel applications and has also done extensive work on the Cummins 5.9L diesel.

I called him to price out a profile for my own TDI. While on the phone, I asked him about a performance profile for the OM617.95x and said he has one that he did back in the 1990’s in which his customer was happy. He has not done one recently, but is experienced in the OM61x since has been to regrind or repaired several to factory specs.

After a little discussion of varying applications the 617 is being used in our circle, he thinks there is a lot of capacity to get more performance out of the 617 cam, even more so then his earlier profile.

He is very interested in the working with 617 folks to create custom grind for each custom use. He offered me for about $340 shipped, a custom grind that he will work with me to get it right, provided that I get him a cam to regrind. I think this a great idea but unfortunately for my engine, I still want to make other mods i.e. different turbo and IP mod.

However, I do think it is important to get some R&D in and if somebody who is further along then I am or is looking to improve on the stock setup, should contact him or even Delta and get a project going. The more profiles available, the better for all of us.

http://www.coltcams.com/

Colt Cams Inc.
2325 264th street
Aldergrove BC V4W 2L5
Canada

Phone: 604-856-3571
Fax: 604-856-3572

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Where does one get a blank?? you need MORE material for higher lift ,not regrinding one that was already ground, all you could do is play with the ramps with a used cam.

DeliveryValve · #2 12-20-2010, 08:25 PM

Quote:

Originally Posted by panZZer

Where does one get a blank?? you need MORE material for higher lift ,not regrinding one that was already ground, all you could do is play with the ramps with a used cam.

A cam is basically a bump on a circle. When the follower is siding on the circle, it is at zero lift. As the cam rotates, the follower goes over the bump positive lift is created. When you regrind a used cam, you make the circle smaller so the bump would have a higher lift. The valves are then adjusted to take up the slack from making the circle smaller. But there is a cut off point to how much it can be adjusted and custom adjusters may have to be created.

Lift is just one aspect of a few aspects to consider in cam grinding, the art is to find the right amount to make the engine happy. Some other aspects to consider are lob separation, overlap, duration and lobe centerline.

Of course IF your engine calls for a much higher lift, then a blank cam maybe in order. But you have to remember with the higher the lift, it may also entail having a reliefs cut in the pistons from keeping the valves from hitting them.

You might want to talk to Geoff in person, he is very approachable and will talk to you through on what he can do with a used cam that's not worn.
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