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  #16 (permalink)  
Old 07-12-2008, 06:07 PM
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I think that is a legitiment number.

Bare in mind there is a LOT more to making horse power than throwing a bunch of specific parts together and hooking it to a dyno.

There is 20-30 hp difference in the honing jobs done on cylinder walls.
There is 10-20 hp difference in the rings that are used. full circle?
Piston crown detailing makes up to 30 hp difference on many engines.
We know that thin synthetic oil is good for 1 1/2 % more power, instantly.
Then you use a Jessel drive and get the cam timing perfect for what the combination wants,
change pushrods to find any harmonic unbalance and get the best numbers.
etc.

Lot of "minor" details done by skilled craftsmen add up to more hp than what can be duplicated by the hot rod masses.

You can bet your money that the AFR engines are detailed to the max in every way, shape, form, and fashion.

Realisticly IMO if most of us put together the identical parts list we would be doing good to get 90% of the stated figure.

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  #17 (permalink)  
Old 07-13-2008, 03:34 PM
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Quote:
Originally Posted by ScoTFrenzel
I think that is a legitiment number.

Bare in mind there is a LOT more to making horse power than throwing a bunch of specific parts together and hooking it to a dyno.

There is 20-30 hp difference in the honing jobs done on cylinder walls.
There is 10-20 hp difference in the rings that are used. full circle?
Piston crown detailing makes up to 30 hp difference on many engines.
We know that thin synthetic oil is good for 1 1/2 % more power, instantly.
Then you use a Jessel drive and get the cam timing perfect for what the combination wants,
change pushrods to find any harmonic unbalance and get the best numbers.
etc.

Lot of "minor" details done by skilled craftsmen add up to more hp than what can be duplicated by the hot rod masses.

You can bet your money that the AFR engines are detailed to the max in every way, shape, form, and fashion.

Realisticly IMO if most of us put together the identical parts list we would be doing good to get 90% of the stated figure.

So according to you, we should subtract 80hp from AFR's dyno tests to see what their heads will really do if we were to buy them. 30+20+30=80hp
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Old 07-13-2008, 03:45 PM
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If you don't know how to get the "minor details" right, and many people don't(or don't even know what they are), then ScoT is pretty close, maybe 20 HP overboard.
That's the difference between "engine builders" and "engine assemblers". Assemblers can get it together , but usually only Builders can make the big power. F-Bird, I'm sure you already know this
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Old 07-13-2008, 04:16 PM
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I thought about building a 347 stroker with afr 185's and about 12 to 1 compression. If it got about 450hp I would be more than satisfied
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Old 07-13-2008, 05:24 PM
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ive seen quite a few N/A 347s dyno and they are usually quite dissapointing.

Even some of the well put together ones.

I know of a local 306 running around with AFR heads a good intake setup and a very healthy solid roller.

It makes about 300whp through a T5 and a 8.8. Pretty sad if you nask me.
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Old 07-13-2008, 05:43 PM
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How many people would use an already running short block?
or dingle ball one in their garage to build an engine?

How many people insist that torque plate honing helps 20-30 hp?
How many people insist that fuzz brushing cylinder walls helps 10 hp?
How many people insist that low tension rings adds 10+ hp?
How many people insist that full circle rings adds 10-20 hp?
How many people insist that if you have dome pistons that contouring helps 20-30 hp?
How many people would use a "jessel" and find exactly what the engine wants?

For the arithmetic challenged
455 x 90% = 409.5

That's 45, not 80 hp

Generalizations are just that, generalizations.
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