OK has anyone out there had the Opportunity to put a real dyno'ed engine on the Desktop Dyno to see just how close they really are.

I did a few years ago with my buddies 521 that dyno'ed out at 828 H.P.
and on the desktop it came out to 821 H.P. So I have always felt the numbers I get from my desktop dyno would be within reason give or take a few H.P.'s.

 

What are the specs on that engle cam? I have inputed all your other specs a while back to see how close it was to yours. The performer RPM setup for the 390 yeilded 422HP so that is pretty close to edelbrocks real dyno at 418HP.

 

Engle RJ-38 Cam Spec.

Intake open 24
Intake close 50
Exhaust open 60
Exhaust close 14
Valve lift
Both .654
Running Dur. 292

Gross Cam Lift
Both .378
Dur. @ .050 254
Lobe Center 108



Let me know your outcome .
ShaZam

 

What size valves do those heads have? Do you have flow charts for the heads?

 

The size valves are 2.19 intake 1.71 Exhaust and the heads have the full pro porting job done to them.I don't have the flow sheet on them but when the guy had them first built he told me they where the best.

 

You would need 470/380 cfm port flow at .700 lift to make this much power. I don't think your heads have too much metal left. What kind of rpm's are you turning on the dirt and where does this thing idle?
http://www.clubfte.com/users/ratsmoker/shazam.jpg

 

My scanner is on the fritz , so I'll post the #'s I came up with on Desktop Dyno2000. The HP peak was 738@6500rpm and Torque peak was 661@5000rpm. the sheet shows over 600lbs/torque from 3500-6500. I used the canted/rectangle port, fully ported heads to get these #'s. I tried using a tunnel ran intake instead of a single plane and it only boosted hp by 6 and tq went down 1. Do you have the actual head cc's, piston dome or dish volume in cc's, head gasket volume and deck height? I can put these #'s in the comp. ratio calculator and come up with actual #'s.

 

[updated:LAST EDITED ON 29-Jan-02 AT 10:50 PM (EST)]NO my heads have aluiminum highport plates put on the heads. Rises the ports 1" and makes it straight.
Looks like ratsmoke got all the data right Same Graph I have.

OK and what does this motor turn in the dirt ok here's one of my run in type.

Pull on track back up the eliminator hook up cable and snug it up .
I'm now hook to a sled that weighs 30,000 pounds with a weight box that moves up a set of rails as you go down the track and puts more wieght on the skid pad to stop you.
With cable snug check over all gauges to make sure all is good set replay tech then watch flag man. Green flag I raise RPM's to 4000 clutch starts to engage raise rpm's to 4500 truck starts to move, Slip clutch and raise rpm's to 6500 rpm and at the 75 ft. mark let clutch out all the way and mash it, RPM 8000 plus and hold on for the ride. 25 Sec. later your at the end of the track hopefully in the 285 to 300 ft. mark.
That's one of my runs in 6200# Super Stock.

Where does this engine Idle, IN the shop right now I can go out there turn on the fuel pump, pump the gas twice hit the started and then the pressure bypass and it fires and come to life, with out anything more fiddling with the gas it idles like a monster motor it is at 800 RPM's