I'm going to dyno my New engine tommorow. So Everyone post a number for your guess for RWHP, and see how close you are. Use your desk top dyno. If using one let us know so we can see how close you are with it.
Here is my Specs:
Engine is SBC 383 with the following.
1. Heads dart pro 1 aluminum 215 64cc / dual springs / 7/16 studs / Intake – Exhaust 2.05 – 1.60VJ Comp Retainers / 220 seat pressure / Harland Sharp Roller Rocker 1.5 / 6" rods
460-ish rwhp, peak at around 68-6900 rpm. Carb is a little small, and compression low for a cam that big(if 288/292°@.050" is correct??, lift seems low for that much duration). If 288/292° is advertised duration, then only about 415-ish rwhp.
No desk top dyno, but use the G-Tech and been on an engine dyno once and chassis dyno twice just in the last year. Also running a 383 but my numbers will NOT be like anyone else's unless we have rock crawlers here. My roller numbers are 273 hp @ 4050 and 433 lb/ft @2800. Yours I'm guessing to be 320 to 345 hp @ 5900 and 355 to 395 lb/ft @ 4100.
About 15 T buckets ran the rollers this fine November day in SE Arizona, all were at least OHV sbc, lots of tunnel rams, a few blowers, and with the exception of 3 rides, laid down from 109 to just under 200 hp. The guy in this picture beat me by almost 100 hp, but I still had the highest torque numbers. One blown 454 small block mouse managed around 380 hp with a self imposed throttle stop that only allowed 1/2 throttle from the pedal. He was an older gentleman and his engine was a $15K pro built.
You can make a dyno say pretty much what ever you want. Even the same settings on two dyno's will not be the exact same. What runs goo on the dyno doesn't always directly realte to performance on the track or street eiether so try not to get into that trap.
Just got back the dyne guy wants me to put some more miles on the engine first. He set the carb and did a small pull only to about 5000 and said off what he saw and feels he says should easily make 400 so I will go back next week.
Good to hear, if you hit 350 hp @ 5000, you already exceeded my guess by 5 hp and I think your motor will keep producing more power for at least another 900 rpms. My guess of your torque might be close.
Well I'm thinking I will have the numbers to post this week or 1st part of next week. I don't think I will be where I would like to be, but are we ever there.....lol
Sorry, its been so long, but had to go on a short deployment. So I have not been able to make it back to the dyno guy. Maybe soon. I did go to the track today. I ran a 11.7. I was spinning coming off the line and was not hitting my shift at the right times. It will take me some time to dial it in, but I feel I can easily run low 11s.
Well the car is a 68 Camaro wgt is 3400 with out me. As far as the cam specs... Allot of controversy on that. The guy I had assemble my engine, I also had him order me a custum gind. He swears the duration at 50 is INT: .288 EXH: .292. I ask him many times to make sure that was not advertised duration and he said no it was at 50. So I have my doubts.
Well the car is a 68 Camaro wgt is 3400 with out me. As far as the cam specs... Allot of controversy on that. The guy I had assemble my engine, I also had him order me a custum gind. He swears the duration at 50 is INT: .288 EXH: .292. I ask him many times to make sure that was not advertised duration and he said no it was at 50. So I have my doubts.
That would be a hell of a cam. BTW, the specs for duration are in degrees, as in 288° intake and 292° exhaust.
A cam w/that much duration wouldn't be able to use an ignition timing curve per se, most likely you'd need to lock it in at the total advance, possible using a vacuum advance and a timing retard (or separate starter and ignition switches) to allow it to start when hot w/o kicking back or dragging the starter.
There wouldn't be enough vacuum for power brakes and it would be idling above 1000 RPM. The idle would be decidedly rough. Not just some lope- I mean ROUGH.
Not exactly lol. I didn't have to much vac so I did away with the power brakes and went with hydro. The timing is set at about 19-20 initial with total right now at about 36. Idles at about 8-900. I quess the only way I will ever know is buy another one that way I can have it... Anyway I ask him so many times, and he said that it was basicall a race cam that was based off a 700 lift, but custum downed for what I wanted.. what ever that meant. I quess I need to put more pressure on him to call the guy while I'm there and ask him.
Well, whatever you DO have for a cam, the engine seems to like it, you're not going to run those numbers traction limited, unless the engine is making some pretty serious power for a streetable combo.
Using the 11.7 ET and guessing the speed to be 124 MPH, the Wallace calculator says:
Your HP computed from your vehicle ET is 377.62 rear wheel HP and 419.57 flywheel HP.
Your HP computed from your vehicle MPH is 467.22 rear wheel HP and 519.13 flywheel HP.
120 MPH:
402.63 rear wheel HP and 447.36 flywheel HP
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