I'm in the proccess of having an engine rebuilt. Is there program I can find online to estimate horsepower and torque.I will only need it this one time and hate to spend the money on a program that I'll use once. Plus I need all the spare money for this rebuild, very unexpected and exspensive. Any help will be appreciated.

Hello rbarnes,
What do you want to now?
(estimates?)

EDDY merlin.

Thanks Eddy
I'm just trying to get a ball park idea how much power(horse and torque)this engine will make.It's not going to be radical just a little better than stock. This is what I know so far on what's into it.
*396 (L35) +.060
*Pistons forged 9.7:1 comp. might get higher will have to deck the heads.
*Stock forged crank
*Ported stock intake to match heads.
*Oval port heads 101 cc(stock)port&polished opened as much as possible bigger valves 2.19 intake 1.88 exhaust.
*Reworked Q-jet carb.
*Cam 214 224 dur. 502 intake 527 exhaust.
*Roller tip rockers

Tomorrow i´m take a desk top dyno on this!
Check this out then!

EDDY merlin.

Thanks Eddy

Hoi rbarnes,

Here we are with the dyno!

*Engine is 396ci + .060 = 407.7 ci.
*I´ve take a 9.7:1 compr.
*Q-jet.....Is this a 750 or 780 cfm carb?
I take a 750 cfm for this dyno!

O.k. here we go!..:

DESK TOP DYNO 2000 :

Peak power: 451 hp. @ 5500rpm.
Peak torque:467 lb.ft @ 4500rpm.


DESK TOP DRAG 2000 :

*took a 2500 rpm stall speed!

1/4 mile result : 12.645 secs.
trap speed :117.8 mph.

0-60 mph :.......4.882 secs.
0-100 mph :......9.530 secs.

So that´s it!
Hope you enjoy it rbarnes!,

EDDY merlin.

Thanks Eddy, That was alot more than I expected.
Have a good evening. Ray

That combo won't be running 12.6 at 117 MPH

The proof is in the pudding (or whatever that saying is).

Chris said it plain and simple. And there is no better dyno than a timeslip.

Here is some real world data for you. I have basically the same motor except for a bigger cam 286/296, 226/236. 535/.551 on 112 and a ported Performer 2-0, '69 Chevelle SS, 3.73's, 3000 converter, 1-3/4" headers, 2-1/2" exhaust.

No traction or hole shot whatsoever with the suspension set up and street tires.
14.24 @ 99.09 MPH
14.09 @ 97.XX MPH

Forget the ET, but the MPH indicates about 360 -370HP. Remember, this is installed in the car with hot under hood air and no tuning. There is a 1/2 second with correct tires and suspension and 3 - 4 mph with a good launch and proper jetting. Still puts it at 380 - 390 HP which is still rather stout for what is really no more than a 396/325 with bigger valves, cam and intake.

Eddy, 450HP is unrealistic from a 214 @.050 flat tap hyd cam'd 402 motor, especially with a stock intake - ported or not. FYI, when you set up the airflow for DD2000, you need to get the ChevyHiperformance Flow Data for the heads, enter the data from the chart and make sure to change the flow figure to 28IN hg. I think the default value is 1. This really causes erroneous predictions. For what its worth, I have my 408 motor combo saved on DD2000. It comes right in at 390 HP at 5000 in the sim program.

EDDY merlin, My old power-speed calculator only shows about 310 H.P. needed to make a 3900 pound car run 100 MPH in a quarter mile. A warmed over 396 with bigger valves might exceed this by 20-30 H.P. but that cam is too small to do much. My guess is high thirteens at about 100-102 MPH. Almost all these older engines are overrated a bunch.

O.K. , yes.... think i did something wrong!
I´m gonna figure out what!
thanks guys for comment!!!

But,...... rbarnes here you got your reply´s!!!!!!!! :D :D

EDDY merlin.

Eddy,

Tell you what i have done is to set up engine sims based on published articles of tested engines. This allowed me to understand the dynamics of data input against published results. Of particular interest are the tests that are available for the 454HO crate motors. This is a very conservative motor with readily available cylinder head information. The biggest problem with the sim is the interpretation of cam data by the program. You can set up a 454Ho motor to see what I mean. For the cam input you have to use advertised numbers which really clouds the results, becasue there is no variance for cam dynamics for agressive ramp cams. You can step a fast ramp cam up to a solid for comparison (ie Comp XE series flat tappet hyd.), but there is no differentiation between a hyd roller and a solid roller. And even with solid rollers, there are differences. Try using the following numbers for cam data for a 454HO and you will see what I mean, Int. duration 272, Exh duration 290.