thoughts on Cam Choice

[workin it]

Okay so here is my basic engine. 1992 351W, GT40 Iron heads, long tube heades, and AFI system on top of a Edelbrock Airgap intake if I can find one thats not an RPM.

This is the cam Erson feels will best suit my needs. Its a hydrolic roller retro-fit cam. Your thoughts. Vehicle has a 5speed and will mostly see light trail and street use.

Part No.: E212836
Grind: RH-282-1A
112+4 Lobe Separation Angle
Overlap: 58
Intake Opens: 33 Exhaust Closes: 25
Intake Closes: 69 Exhaust Opens: 77
Running Clearance: 0.000 0.000 [Hot]
Valve Lift (Int / Exh): 0.512 0.512
Duration (Int / Exh): 282 282
Checking Figures @ .050" Tappet Rise
Overlap: -10
Intake Opens: -1 Exhaust Closes: -9
Intake Closes: 35 Exhaust Opens: 43
Duration Intake: 214 Duration Exhaust: 214
Lobe Lift Intake: 0.320 Lobe Lift Exhaust: 0.320
Intake Center Line: 108 Rocker Arm Ratio: 1.60 /1

[Efibroncoman]

Re: thoughts on Cam Choice

Duration seems a little high for a crawling motor.... If for a daily driver it'll probably be good. It will definitely sound nice with a lopey idle.

[TRAILBOUND]

Re: thoughts on Cam Choice

Dave sorry the picture is so damn big, I stole it off my build thread. I cant speak as to how it runs because well, mine doesn't run. But your motor is pretty much the same specs as mine.
I chose this cam for 2 reasons, low on set of power (800 rpm) and should be compatible with the AFI setup. I was eyeing their injection when I started buying parts. My truck WAS being built as a pretty much dedicated trail rig and I even though of advancing the cam a little to bring on the power even sooner.
http://i183.photobucket.com/albums/x...6/9082707a.jpg


edit: guess I copy the picture link and not the picture, that turned out pretty good on accident

[workin it]

Re: thoughts on Cam Choice

Thanks for the infomation. I spent about 30 minutes with Erson's cam tech going over my requirements and intended use. Idle quality was very important as I hate grumpy motors along with good trail driveability. Trail for my purposes are mostly old logging/CDF roads.

If your thoughts are this will idle like crap and the rpm zone is above say 1500 then I need to recontact Ersons. I'm looking for great idle and the RPM zone from idle to whatever the top is. Not trying to make a racer or rock crawler More of a putter.

[pipelayer]

Re: thoughts on Cam Choice

this cam should be fine for that

[Efibroncoman]

Re: thoughts on Cam Choice

That cam should idle fine, but it will have a bit of a rumble. I do think it will be good for your needs. The main key with fuel injection is to have a cam with 114 degrees of lobe separation or better. My current cam has 112 and leaves a bit to be desired off idle but does run.

The cam I plan to use in my next build is the Comp Cams 35-512-8, it is newer cam than the 35-308-8 that Crawlin68 and Delta are running but I think it should work even better for a crawler. The rpm range is 900-5000 rpms and according to Comp Cams tech dept. should work great for off-idle torque and smooth drivability.

[DirtDonk]

Re: thoughts on Cam Choice

I usually recommend the 114 degree angle too, but what about with a TBI system vs an MPFI setup, like the stock Ford stuff?
I don't remember seeing discussions about the possible different needs of the two types of injection.
The one feeding through the manifold might have completely different reaction to that than one directly injected to the backside of the valve.

Worth asking about anyway.

Paul

[pipelayer]

Re: thoughts on Cam Choice

You should call http://www.affordable-fuel-injection.com/
they will help you out big time, they told me my cam wouldent work with the injection they sale without some mods and still would be hard to get good. That some good customer service to me.