HP Estimate

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SlnLax43

New Member

May 5, 2004

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Nov 3, 2004

#1

• Nov 3, 2004

• #1

I have a rebuilt 302 in my '67 project car and have no clue how much HP it has. Can you give me an estimate? Here are the specs:

1968 Ford 302, roller cam, roller rockers, new pistons, headers, Holley intake, Holley 750 cfm carb, high flow water pump, MSD Accel and Crane Ign., aluminum pullies, flow master exhaust, new spark plugs, New distributor. I think thats it. I have pics but can't figure out how to upload them and don't have them on a website.

-Mike

EDIT: go here for pics... http://groups.msn.com/Mustangs1234/shoebox.msnw?Page=Last

 

Pbum5

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Oct 27, 2004

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Minneapolis, MN

Nov 3, 2004

#2

• Nov 3, 2004

• #2

Many factors to consider..
How much is the Compression ratio? What size cam?

 

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SlnLax43

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May 5, 2004

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Nov 3, 2004

#3

• Nov 3, 2004

• #3

Not sure the ratio (wasn't informed of it when I bought the car a week ago). Not sure what size cam either but I have a paper somewhere with stats on the lift, degrees, and all that.

Just want an rough estimate

-Mike

 

stangman67

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Feb 8, 2003

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connecticut

Nov 4, 2004

#4

• Nov 4, 2004

• #4

250

 

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SlnLax43

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May 5, 2004

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Nov 4, 2004

#5

• Nov 4, 2004

• #5

I don't think so. My Dad's Corvette has close to 350 HP and the 302 is only .4 liters smaller and has many better parts that add more power. It has to have at LEAST 350

 

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jaredgoodwin

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Sep 29, 2004

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Nov 4, 2004

#6

• Nov 4, 2004

• #6

Too big of a carb and 240-275hp at the flywheel depending on the cam, heads, C/R. You should consider putting a smaller carb on it, probably run better and get better mileage.

 

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SlnLax43

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May 5, 2004

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Nov 4, 2004

#7

• Nov 4, 2004

• #7

hmmm...interesting...

it feels and sounds like it has a LOT more than 240-275.

where would you go to get something like this tested?

Thanks,
Mike

 

66P51GT

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Nov 7, 2003

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Cerritos, CA

Nov 4, 2004

#8

• Nov 4, 2004

• #8

It has to have at LEAST 350

Click to expand...

No way it is 350.

Sounds more like a stock 5.0 with headers. Carb is too big. Limiting factor are the stock heads. I'd say that the 250-275 range is about right. Torque should be in the 300 range.


http://www.jason.fletcher.net/tech/hotrod91/hotrod91.htm
To begin the test we outfitted the RHO 5.0 engine with a stock '85 Ford dual-plane intake manifold, and a 650-cfm Holley double-pumper carburetor, an '85 electronic ignition distributor from Ford Motorsport with an MSD-6A amplifier and MSD wires, stock stainless-steel factory headers, and a 2 1/2-inch-diameter dual exhaust system with a pair of turbo-style mufflers. Once the engine was sufficiently broken in, dyno operator Kevin McClelland experimented with the total timing and jetting on the 650 Holley carburetor until power was optimized. In this "stock" configuration, the RHO engine generated 296 lbs.-ft. of torque at 3,500 rpm and a respectable 244 horsepower at 5,250 rpm.

 

302 coupe

Founding Member

Mar 2, 2000

1,952

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Macon, Ga.

Nov 4, 2004

#9

• Nov 4, 2004

• #9

SlnLax43 said:

hmmm...interesting...

it feels and sounds like it has a LOT more than 240-275.

where would you go to get something like this tested?

Thanks,
Mike

Click to expand...

You need to find a chassis dyno and get some real numbers. Speculation and guessing don't do much for performance.

 

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SlnLax43

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May 5, 2004

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Nov 4, 2004

#10

• Nov 4, 2004

• #10

I do believe the heads aren't stock

 

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John Z

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Sep 21, 2000

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Morgantown WV

Nov 4, 2004

#11

• Nov 4, 2004

• #11

SlnLax43 said:

I do believe the heads aren't stock

Click to expand...

You need a lot more information before you can estimate the hp from a simulation program. The best source is a chasis dyno. However, you can estimate hp from:
hp=0.413*Weight/T, where T is the time in seconds to accelerate from 0 to 60mph. I think your car weighs about 3200 lbs. This equation is based on physics and determining hp this way takes into account driveline losses and air resistance. So expect a lower value. This is basically the equation used in the GTech meters.
HTH

 

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SlnLax43

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May 5, 2004

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Nov 5, 2004

#12

• Nov 5, 2004

• #12

thank you very much. I should have asked more questions about the engine before I bought it. I just saw that it ran well and was happy with that.

 

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VictorII

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Jun 19, 2004

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Cotati, CA

Nov 5, 2004

#13

• Nov 5, 2004

• #13

SlnLax43 said:

I have a rebuilt 302 in my '67 project car and have no clue how much HP it has. Can you give me an estimate? Here are the specs:

1968 Ford 302, roller cam, roller rockers, new pistons, headers, Holley intake, Holley 750 cfm carb, high flow water pump, MSD Accel and Crane Ign., aluminum pullies, flow master exhaust, new spark plugs, New distributor. I think thats it. I have pics but can't figure out how to upload them and don't have them on a website.

-Mike

EDIT: go here for pics... http://groups.msn.com/Mustangs1234/shoebox.msnw?Page=Last

Click to expand...

The carb. is too big if it is a street car. A 600CFM is perfect in my experience, a 750 id good for the track if your RPM is high all the time. If the heads are stock, you should get around 240 - 250 HP. If the heads are performance heads, you will get more, up to probably around 270. Like another poster said, take it to a dyno equipped shop; then you'll know for sure. Sounds like a sweet build up. If you have deep gears, it'll really pull. Standard (2.80 or so) and it will still pull but not as well.

 

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SlnLax43

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May 5, 2004

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Nov 5, 2004

#14

• Nov 5, 2004

• #14

The gears are 3.25.

Know of any dyno equipped shops near Ann Arbor, Michigan?

 

blue66tang

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Jan 20, 2001

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Medford, OR

Nov 6, 2004

#15

• Nov 6, 2004

• #15

SlnLax43 said:

I don't think so. My Dad's Corvette has close to 350 HP and the 302 is only .4 liters smaller and has many better parts that add more power. It has to have at LEAST 350

Click to expand...

Wow! have you ever riden in a car with 350 hp, no flame intended, but you woud deffinatly know when you have a hi power motor. My guess is right around 250, but with out specifics its realy hard to tell.

 

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SlnLax43

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May 5, 2004

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Nov 6, 2004

#16

• Nov 6, 2004

• #16

Yes, I have. and I've driven it on many occasions. according to every specification I've ever looked up (probabaly 10 different sources including Chevrolet) my dad's 'Vette has 350 and I drive that all the time and just ride in it even more often.