FMS cam specs......coming soon

[Chobobulous]

Very interesting stuff here man, I don't know what any of it means, but its cool to read about!

+1 no idea what he is talking about

[zoom zoom]

Very interesting stuff here man, I don't know what any of it means, but its cool to read about!

[blkfordsedan]

Managed to get some more precise measurements today. I still want to measure directly on the cam lobe for comparison, but the results I got by using the indicator on the backside of the follower have been repeatable by double and triple checking, and jive with what I would expect for a mild performance cam. I will finish up tomorrow and do some more verification. I have devised a spread sheet with the results of all 3 methods I used and the measurements I took. I will also include lobe centers, overlap and all valve timing events so we can enter the specs into Desktop Dyno. After 2 of 3 methods, here's what I have thus far. Like always, they are subject to change, until I'm 100% confident with the results:


Advertised Duration (based on 0-.002" follower lift @ lobe)-

INT = 295*
EXH = 290*

Duration @ .050" Follower Lift (at lobe) -

INT = 214*
EXH = 206*

Lift @ Valve-

INT = .433"
EXH = .433"

Overlap - 25* (this looks a little low to me)

Lobe Centers - 103*

[blkfordsedan]

Well, I fiddled with it all afternoon trying to get a good measurement of lift at the valve. This OHC is a major PAIN. The valve retainer is so small in diameter and sits so far down in the head that its next to impossible to get the stylus of the dial indicator on it without interferance with the rocker arm. I even went to HF and bought a flexible shaft holder, but still couldn't get at it. I'll keep on it, eventually I'll get it.

[blkfordsedan]

Well, like I said, take it with a grain of salt. I didn't have the time to really devote a lot of attention to it. I ran the dial indicator directly on the lobe, but I'm not completely sure that was giving me accurate readings. The geometry of the follower style rocker arm is different than an OHV V8...where you have a crowned lifter that contacts the lobe in its center. I think I need to run the rocker arm on the cam so the pad can be taken into account. I may need to grind a flat spot on back of the rocker on which to rest the dial indicator stem. In any event, I need to think about this some more. I was surprised to see more intake duration, but a lot of SBC cams are that way. If the exhaust port flows good, it keeps the ratio of intake to exhaust flow at optimum. I'm just used to Fords and their crappy exhaust port design. Ill get lift figures when I get the rocker arms figured out, but its just over .400" judging by the lobe. I'll get it all figured out, it'll just take some time.

[FestYboy]

wow, LOWER exhaust durration!?! that's rather unusual.

what kind of lift numbers are we talking?

[blkfordsedan]

So....got some preliminary measurements. I need to do some more messing around with the set-up and get some valve timing events nailed down. It's a little confusing using the wheel on the camshaft and not the crank, LOL. You really have to think and double the wheel reading, then correlate it to the nearest TDC or BDC. I need to assemble the rocker shafts and take some lift and duration measurements at the valve. I also plan on doing a graph of the lobe curb, as these are assymetrical lobe designs. Anywho....here's what initial testing came up with:

Intake Duration = 237* @ .050"
Exhaust Duration = 209* @ .050"

NOTE: Don't take these as gospel yet. These figures are subject to more precise testing and may change!!!

[blkfordsedan]

I didn't get a chance to mess with it this weekend (busy doing yard work), but I brought all my tools, head, cam, valvetrain, etc. to work today. As time allows, I'll get everything set up in my office and should be able to mess with it this week.

[getnpsi]

Would be great info to have, as a jumpoff point. If we know the numbers we can get a turbo grind made that has similar degrees as stock for no overlap but with more lift.

[blkfordsedan]

More or less patiently waiting for an update.

I promise, I'll put it at the top of my "to do" list this weekend.........right below everything my wife wants me to do . I'm pretty excited about being able to mess with it, but the wife doesn't share the same enthusiasm or appreciation for camshaft specifications and design.

[blkfordsedan]

Yeah, I was at the new (under construction) Northern Beef plant in Aberdeen, checking out their conveyor systems. Lovely weather there this week.........if you're a duck.

I have the FMS "competition" cam, which is the more street-able grind with a slightly noticable idle and 2500-redline RPM range. From what I understand, the "Race" grind has a fairly rough idle and 10:1 recommended minimum compression. I'll measure both a stock Festy EFI cam and the FMS cam I have. I could also do their "race" cam, if someone has one they would like to send me.

[muscle_Car1]

More or less patiently waiting for an update.

[Ford Fester]

Aberdeen....that was passing by me on your way. Didnt fms have 2 cams a street and a race? Which one you checking? I have a race one.

[blkfordsedan]

Yes! The degree wheel finally arrived! Earlier this week I picked up a couple light weight compression springs from Home Depot to use as psudo valve springs for testing. I got a lot of stuff to do this weekend, but with a little luck, I should be able to mess with it and come up with some numbers!!

[blkfordsedan]

Nothing yet. I've been in Aberdeen SD all week on business. I should be back home tonight' and hopefully the degree wheel showed up.