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Author Topic:   Horsepower
Scoot
Member
posted March 11, 2002 03:51 PM
How do I figure out how much horsepower I have?

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Scoot
Smith Racing Team
870-365-5989


4d_POWER
Member
posted March 11, 2002 07:39 PM
Only accurate way I know would be to put it on a dyno, there are sites that can guesstimate hp, but they are for the drag racers (based on 1/4 mile time)example:
http://www.4racecars.com/calculators/horsepower_calculator.html

At some of the big car shows, they will sometimes have a traveling dyno that measures hp at the rear wheels.

Also possibly an experienced engine builder would be able to determine an approx hp based on what you have and what you have done to it.

Good luck.

Dixon
Member
posted March 12, 2002 12:13 PM
There is a computer program by the MR.GASKET CO. that is suppose to accurately predict power output of engines. I bought one from Jeg's mail order, I think it was about $35. Overall I'm pretty pleased with it, if nothing else it's fun to play with. You put in all the specs for the motor and it even allows you to tune to get maximum power. Check it out at www.jegs.com

Hope this helps.

Hope this helps

jammin
Administrator
posted March 12, 2002 12:17 PM
Give me a few days and keep looking in the toolbox...working on one for the forum.

jammin


racer17j
Member
posted March 12, 2002 01:16 PM
if you have a good handling car and you win you have enough but if you are 2nd you need more lol


Scoot
Member
posted March 12, 2002 05:15 PM
Thats my problem, my car isnt handling like I want. So I'm going to work on that too. But I was going to order a set of headers and they wanted I know the horsepower.

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Scoot
Smith Racing Team
870-365-5989


Dixon
Member
posted March 12, 2002 05:35 PM
If the Header company was asking whether you wanted 1 3/4" or 1 7/8" primaries (I'm assuming for a small-block) then you have to know where your making your power. The smaller tubes with a longer collector will help lower-end torque, but will hurt the top-end because of more back pressure. I doubt you are terribly concerned with torque below 3500 rpm, so I'd go with the bigger primaries to let it breathe. This is just making a guess though, some more info about what rpm range you're running in and if you have to use mufflers would help.


Scoot
Member
posted March 13, 2002 09:49 PM
approx. 3,000 to 6,500 rpms. no muffler required. 3/8 mile high banked clay track.

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Scoot
Smith Racing Team
870-365-5989


Dixon
Member
posted March 13, 2002 10:42 PM
Scoot,

Do you run a 2 or 4 barrel carb? And are you trying to decide between the 1 3/4" and 1 7/8" primaries, or are there other factors such as primary length and collector length involved? With a smaller carb I'd probably run the smaller primaries, but...

Scoot
Member
posted March 13, 2002 10:47 PM
2 barrel by rule. I personally dont know anything about headers. So I dont know what I'm looking for. I dont want to buy a set that will hurt me in the long run. I'm going to end up with different heads and intake. But not right now.

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Scoot
Smith Racing Team
870-365-5989


Dixon
Member
posted March 14, 2002 08:44 AM
If you want, I can put all your motor specs into my computer dyno and see which will work better. But I need everything: bore, stroke, cylinder head, valve sizes, compression ratio, cfm of carb, intake manifold, and ALL cam specs including lift and what type of lifters you use. Send me a PM and I'll check it out for you.


Dixon
Member
posted March 14, 2002 04:32 PM
You may want to check out an article in this month's Circle Track Magazine. They go into pretty deep detail about how to make headers work for your car. www.circletrack.com


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