cams

[quick 52]

has anyone used comps new 4 pattern cam

[TC]

has anyone used comps new 4 pattern cam

They say they're worth 20hp, the tech comes form Nascar, run different specs for the outside cylinders since the runners are longer, it was interesting reading when I researched it.......

[Barry Donovan]

I love the thought of them.
I run a boxer with two rubber timing belts, one on each cam.

when one does one thing, and the other does its own thing..

9k rpm..back to a smooth idle.

big lesson there for the v8 to have someone make them. No such thing as centered in a rotation from linear...

its abit like porsche making a 68 degree v10. advance hard built in. It is that confusing to think of the cam.

[SuperBuickGuy]

They say they're worth 20hp, the tech comes form Nascar, run different specs for the outside cylinders since the runners are longer, it was interesting reading when I researched it.......

are there caveats? CR requirements? etc...?

[TC]

are there caveats? CR requirements? etc...?

Nothing I read said to run different CR on those cylinders, it was more about how far the charge has to travel, so they keep the valves on the outside cylinders open longer to compensate...... I bet the guys that win at the EMC use cams like this.........

[Aircooled]

If I were to guess, I'd say that maybe the 20hp gain only applies to engines with high rise intakes, single 4 bbl and restrictor plate and that operate at a continuous 8,000 rpm.

[TC]

If I were to guess, I'd say that maybe the 20hp gain only applies to engines with high rise intakes, single 4 bbl and restrictor plate and that operate at a continuous 8,000 rpm.

And I'd have to agree with you... I understand the logic behind it and they have test data to back it up, but for the average everyday guy building a street cruiser it's probably not worth it....... Though for the guy doing the max effort deal, it's something to look at....

[JeffMcKC]

Its nothing new Mike Jones has been doing them for a long time.

With what we do ( our level) its a gimmick, unless you have perfected your Carb, Spacer Flow, Intake Flow then bolted to the head, and Head flow dynamically how are you going to balance the camshaft to that with the Data we can give them?

[dave storlien]

OK its a great idea but lets try to fix a BB chev

[DanStokes]

Dave - Do you have any ideas about Diesel cams? At some point I'm wondering if the cam would be a useful modification to m M-B. As a reminder, I'm putting a M-B OM617 into an S-10 for Land Speed Racing - race only, no road miles. You hear that folks put performance cams in them but no word on specs, etc.

Dan

[dave storlien]

Dan
never have worked with diesels, could be interesting , who grinds cam,s for them

[DanStokes]

Not sure. Delta in Tacoma WA is my go-to cam grinder and if I send them a core they'll grind about any pattern on about any core. But I'd need to send them specs as I doubt they'll have any info or experience on Diesel profiles. I'll keep prowling the M-B forums for info.

Dan

[TC]

Dan do you know about the ADLA adjustments and the rack limiter adjustment??

[DanStokes]

Only that they exist. Folks on the M-B forums throw terms around like everyone knows the jargon but I sure don't. I thought ALDA played Hawkeye on M.A.S.H.

I was thinking the pump probably needed freshening up anyhow. The engine has at least 202K miles - the odo showed 202,000 and the PO said that the odo cable broke just after he got the car. Not likely as the trans seems to have an electronic speedo. Still, at those miles I'm thinking a good cleaning, new seals, and some tweeking are likely in order anyhow. Am I wrong on this?

Rather than hijack someone else's post how about posting the answer on my build thread?

Dan

[Huskinhano]

I believe Ed Winfield did this with the Ford flathead. I read he would grind the lobes based on each cylinder.