Thread: how much hp does my motor make

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can someone please help me i have a chevy 383 stroker with 10:1 flat top pistons comp. .480 hyd. lift cam ,rollor rockers double hump head 202 ink. 1.60 exh. elderbrock jr victor intake 650 holley double pumper hei distributer ,headers

can anyone tell me about how much hp i am making thank you

It would be safe to say, that with the ignition set up right, and hydraulic cam it is probably putting out 170 Kw at 5000 rpm and 3000 Nm of torque at a dead flat curve starting around at 1500 rpm and going up to 3500 rpm.

Where did I get the info ? Looking at a dyno sheet graph printout on a 383 in a 1979 Camaro lt with 2.4 (?) gears, and the cast iron smogger heads. Which goes to show 383's work good on the street with thier ability to pump out the torque at street driven rev range of the motor.

Your engine may not be exact but it will be pretty close in power output.

"t would be safe to say, that with the ignition set up right, and hydraulic cam it is probably putting out 170 Kw at 5000 rpm and 3000 Nm of torque at a dead flat curve starting around at 1500 rpm and going up to 3500 rpm."

Huh?

Originally Posted by techinspector1

"t would be safe to say, that with the ignition set up right, and hydraulic cam it is probably putting out 170 Kw at 5000 rpm and 3000 Nm of torque at a dead flat curve starting around at 1500 rpm and going up to 3500 rpm."

Huh?

Sorry about that, the dyno here prints out in metric measurements, I will see if I can find a conversion formula.

Okay got it

1 Kilowatt = 1.34102209 hp so 170 x 1.34102209 = 228 Hp


As for changing Nm to torque I am not sure about the figures because there are several formulas. including time in seconds. And I am not sure weither you square it or divide it.

Well as for the torque curve being dead flat there was a slight rise and fall but nothing much.

OK - I haven't spent my life around cars and engines as many here have but -

383ci = 228hp ????

Are you sure you didn't mistype 383 as 283????

Seriously - there has to be something wrong with the equation - right????

my desktop dyno shows 358 hp @ 3500 rpm. those are typically at the crank #s

Originally Posted by SBC

OK - I haven't spent my life around cars and engines as many here have but -

383ci = 228hp ????

Are you sure you didn't mistype 383 as 283????

Seriously - there has to be something wrong with the equation - right????

I am beginning to think I read the graph wrong, I was only down there to pick up his brand new steel crank and rods and pistons. I will see if he can email the graph to me.

Why not go rent a pull on a chassis dyno and know for sure??? Desk top dyno's are usually quite generous..... Which is why everybody talks about their 500 horse small block that runs in the 9's....on the computer!!!!

Originally Posted by Dave Severson

Why not go rent a pull on a chassis dyno and know for sure??? Desk top dyno's are usually quite generous..... Which is why everybody talks about their 500 horse small block that runs in the 9's....on the computer!!!!

Engine Analizer dyno program is very accurate, but it's big $$$.