Custom cam thread
 

Here's some "custom" cams for oso members that have been specd for their combos.

540ci
AFR 325 heads
9.6:1
1050 CFM carb
Single Plane
241/246 duration
112 LSA
109 ICL
681/663

540ci
GM Rectangle Iron heads
9:1
800 CFM carb
Single plane
239/246
113 LSA
108 ICL
646/639

540ci
AFR 325 heads
9.8:1
1000CFM carb
single plane
242/247
112 LSA
108 ICL
664/656

439CI
AFR 265 heads
10.4:1
950 CFM carb
dual plane
234/240
112 LSA
108 ICL
630/615

496ci
AFR 305 heads
237/243
113 LSA
108 ICL
663/664

500 EFI mercury 502
Dart 325 heads
9:1
237/239
113 LSA
109 ICL
639/630

This just in

555ci
AFR 325 heads
Procharged
10lbs boost
239/246
114 LSA
111 ICL
644/629

Here is mine if anyone cares

509CI
Brodix 325's
8:1
5lbs boost
241/250
113LSA
110ICL
625/625 lift

Makes 705 hp. idles like a Toyota Camry

This is NOT a MK cam, it was ground by Bullet, so some of you probably know who spec'd it.

You should also list if the cam worked or caused problems. We dont want somebody stumbling onthe the thread and copying something that doesnt work.....

There's no need to send you mine. it's the same as the 496 you already posted.

Good point. Unfortunately, I do not have dyno results from all of them, just a few. Some don't even dyno.

What I find interesting, is , the similarities between these camshafts. Whether we are talking about a 440ci big block, or a blown 555ci, there isn't a ton of difference in the cams.

A 9:1 540 with GM heads, gets basically the same cam as a 540 with afr heads and nearly close to 10:1 static. And everyone thinks they are getting some one off highly detailed cam design for their "specific" package. :helmet:

they are. all the other cams fit fords or small blocks...

Currently running a 60watt bulb, may be upgrading to a 75watt bulb this winter......

Any reversion issues with that light bulb sucking in negative electrons?

The real question:

Does it emit light?
or
Does it absorb darkness?

555ci JC Performance/Smith Power
Brodix 2x heads
Roots blown
6lbs boost
262/272
112 LSA
109 ICL
708/708
Crane solid roller cam, lobe designs from track roller profiles.
Using same cam in a 573 now :)
Tried Comp Cams same specs, made more boost but less power so numbers don't always tell the whole story.

Mines listed, did not make power, found issues..

That`s a healthy cam with some lift , I like it . what do you run it up to? Ever dyno it? Whats it idle like?

Need more info :D

Wonder how much power is left on the table here? Looks like 651 would have worked better.

I'm assuming you're referring to my 555 build..

My camshaft WAS spec'd to work with the shortcomings of my particular build and may not be a good comparison to others

I wanted a decent idle and it had to work with my marginal EMI exhaust..

I wasn't after MAXIMUM hp.. Just wanted decent reliable power...

In fact, it made MORE hp than anticipated.. :)

http://i130.photobucket.com/albums/p...ps9thdxqlq.jpg


No idea on the reliability factor yet though.. :( only have about 10 hours on it..

My first Bob motor build Circa 2009/2010:
540 CI 9.2 CR, AZSM Honed MPI intake, extra porting, Dart Iron Eagle 308's cleaned up, EMI thunder long riser exhaust. Never dynoed, ran real strong though. Short life due to assembly error (my fault). Was supposed to be 5600-5800 RPM peak promised 600 hp. Fuel use and tune to make happy supports that plus a bit extra. Actually was thinking of using this cam again on motors in new boat this spring since I still have it then having clone made. Prob just go with one of the Lunati grinds now. They look nice especially for the price. Next builds more budget minded.

Standard firing order core# 315685
113.9 Lobe Sep
INT/EXH
Centerline 108.9/118.9
Duration 235.6/240.7
Lift .6207"/.61501"

2nd Bob motor build 2014:
548CI, 10.2 CR. AFR 335 full CNC heads, Edel. 454-R Dom intake, Accel 2100 CFM TB, Holley HP EFI, LS3 ignition, Same EMI Thunder long riser exhaust. Engine was a narrow peaky powerband but found the 6300 rpm peak finally with small prop. Boat ran 80 and climbing (never got peak setup/tune figured out) which requires ~700 HP with that hull, never dynoed. Promised 730-760 HP @6300 rpm. Engine had possible slight reversion. Never milked oil, but occasional steam from breathers. However, I did spec cam for full dry exhaust and was late in season when finished assy so never extended my tails through transom. Engine is on stand with probable spun rod bearing. Will be tearing apart to fix shortly and I am now interested to see what cam condition is.

8.1L firing swap core 8620
113.1 Lobe Sep
INT/EXH
Centerline 109.1/117.1
Duration 243.5/250.2
Lift .6804"/.66293"

Bought a boat with the motor apart and had the cam spec'd out.
It is a crane with
lift .631
duration 252
center line 113

These are the only numbers I got so I do not know if this is for both intake and exhaust. I am building a 548 BBC with 088 heads and 10:1 compression NA. This is for a 30ft advantage boat with a single 850 and Edelbrock Victor R manifold. Seems like a good place to start and the cam is still good. What do you think? I come from a drag racing background so I am trying to learn what works with boat motors as they are obviously a different animal.

thanks

My build is the second one listed. The boat runs very good and I have not had any issues other than some dialing in with timing and carbs. Picked up 6 plus mph with a cam change (Bob M cams) and clean up of the heads. I have put only 10 hours or so on it but so far so good.

540ci
8.2cr
243/249 @.050
114 LSA
.662/.647 Lift
8.1 L firing order
Vortech Centrifugal Super charger
AFR 325 CNC chambers
At this point I am seriously considering not even taking a chance on this "Custom" Cam and going with something off the shelf. When this project started reliability was the Highest of priority with a stable long life valve-train and a target HP of 800HP was the Goal@6000rpm. I was willing to sacrifice max hp for reliability
Motor is sitting in my shop with short block assembled, camshaft installed ready to bolt together. Unfortunately I have lost interest in the project. I let myself get led along by Bobs BS for over a year and finally had to distance myself from him. What I found interesting was how quick he was to point to others for his repeated failures to deliver as promised. I have since spoke with a couple of individuals Bob pointed to with fault and it turns out Bob is the one not them who didn't deliver. Not a Fan of MK done with this jerk off.

Seriously. Wait til MT see's this. Cam specs sounds like most all others give or take. 800 hp NA? 13:1 comp..

8.2 CR Supercharged

Oops. Didn't catch that. Makes it all the more interesting though.

On the 555cid; ran at 5900rpm WOT. Made over 850 at 6300 on Brad's dyno. Have a short video of it idling but cannot post it, says it's too large; it idles at 1100rpm, 700rpm in gear with no surge. Doesn't matter which carbs either; same idle using three different sets (differing CFM), it's easy to tune. I should mention that the Comp Cams steel billet cam was ground on a 114 LSA. I think that's where the boost was gained and where the power was lost in this combination.

555ci JC Performance/Smith Power
Brodix 2x heads
Roots blown
6lbs boost
262/272
112 LSA
109 ICL
708/708
Crane solid roller cam, lobe designs from track roller profiles.
Using same cam in a 573 now
Tried Comp Cams same specs, made more boost but less power so numbers don't always tell the whole story.

Thats pretty good info. Just for the heck of it, I put your combo in my cam software program. For your combo, solid roller, 555ci, 6100RPM, 6lbs boost, the cam it spit out spec wise

262/274 , 113 LSA , .724/.725 lift , thats figuring .016 lash.

Seems like whomever picked that cam, may have known a thing or two. Bet it made pretty good power too. I did use the BB2X flow data, with CNC ported chambers. Not sure if you have that, or any chamber work, either way, fun stuff.

Would be interesting to see dyno numbers with those already listed, assuming they've been dyno'd

First one was mine 630 hp and 638 tq in marine trim

Were those cams from MK?

yes sir. Junk

I have almost the same setup as you do. 540 -315 AFR heads. The cam is 246*-250* at .050 >663-.654 lift. 112 lc. Can you post what you replaced that MK cam with and what the result it made? I am going to rebuild and might make a change.

You Dyno?

I will post results when all is done I am just now tearing into this and won't be done for a while

You have around 300hrs on your set up don't you ?
On paper, it looks like a great combo.

Yes.It has. I have a bad habit of If someone is having a problem I think I will have it to. Its just me.

It's human. Sometimes good,sometimes bad. LOL.

Have to what?

Hello, I have a set of 540's, I'm getting ready to recam, they are close to your second combo, but with Edelbrock heads. Any dyno numbers on this combo?
Thanks Sir..

I should have clarified this thread. None of those camshafts, were picked by me. They were examples of what marine kinetics has specd for various builds, for comparative purposes.

Here's my 468 recipe thanks to joe!

468 stock forged crank, forged rods
2399 Pistons
088 500hp heads
Crane 134561 cam.
Hyd flat cam @.050 236/246
.553/.571 lift
114 lobe sep
525sc blower and carb 5lbs of boost

Made 572hp at 5600
I think it was 650 tq