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Old 11-22-2002, 03:28 AM   #1
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Horsepower difference between 306, 331, and 347?

What are the horsepower differences between the 3? Assuming idetical components, heads, cam, intakes, etc..... What other factors would determine the differences? Just curious on which I should do. Thanks- Dan
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Old 11-22-2002, 03:54 AM   #2
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Cool

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Old 11-22-2002, 04:53 AM   #3
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just a guess, but wouldn't bigger be better? Assuming identical parts and all.
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Old 11-22-2002, 11:35 AM   #4
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If using identical parts ie heads intake cam and exhaust on the three differnt displacement engines, the HP difference would be minimal to none.

Take a 306 that makes 350FWHp at say 6000 RPM, now change the stroke to make it a 331. That engine would produce about the same amount of HP at 5514 RPM. Take that same 306 and now change it to a 347 and you hit your HP peak at 5202.

This is simplified a bit, because the higher piston speeds associated with the strokers will change the intake charge demand. The cam could really hinder the performance of the stroker if the valve events dont open soon enough to take advantage of the high piston speeds.

But for the most part, the answere is correct. Bolting the same sheet on the differnt displacement engines results in the same HP at a lower RPM.
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Old 11-22-2002, 01:41 PM   #5
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So the higher the displacement, the earlier the peak hp occurs, then drops off? So at say 600 rpm, the 306 would hava the "most" cuz the others wouldve already peaked and be falling?
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Old 11-22-2002, 02:01 PM   #6
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In most cases, the bigger one will make more torque across the spectrum. Torque is proportional to CID*VE, all else equal, and the decrease in VE will usually not be enough to fully counter the increase in CID.
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Old 11-22-2002, 06:01 PM   #7
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Kim hit the nail on the head. You select parts based on the engine you're building. Even when planned to be used in the same way i.e. 80% street / 20% strip, a 347 would be very restricted when built with parts that are optimum on a 306.

A 347 is 13% bigger than a 306 so in theory would require 13% more airflow to have the HP at the same peak. The HP would be about 13% greater at that point on average.

People do this all the time, put 302 parts on a 351 and can't understand why it's makes only a little more HP and 50 ft. lbs more torque.
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Old 11-22-2002, 11:16 PM   #8
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sounds too complicated..

how i think about it in my head...

with the right parts, say 13% larger as was used...

if a 301 makes 302hp, then its at 1hp/cu", now it seems easy to figure the possibilities.....you want about 1.3-1.38hp/cu" for a nice street engine imho
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