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PostPosted: Thu Mar 03, 2016 1:22 pm 
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Location: Texas
https://youtu.be/ipsuhgmV0J4


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PostPosted: Thu Mar 03, 2016 2:56 pm 
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Gotta love CHI heads.

They ended up making 803 hp with a 450 inch engine.....1.78 hp/ci. Essentially the same hp/cube that Brian's 434 was making.

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PostPosted: Fri Mar 04, 2016 9:59 am 
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Yep, good stuff. Hey Brent, What RPM do you typically start from when you dyno? I noticed these guys started from 4900. I have heard an engine on a dyno will show more power if you start at a higher rpm- have you seen this to be true?


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PostPosted: Fri Mar 04, 2016 11:20 am 
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No, not true at all.

Where you start the pull depends on the engine, the application, and the dyno.

Some dynos start the pulls at peak torque (probably what that Superflow was doing). They are more computer/automatically controlled. Some dynos start recording the pull where the engine is held down for a few seconds. It notices the pause and starts recording.

The fact of the matter is that not every engine can be pulled down to 2500 or so, and not every dyno is stout enough to hold it even if they were. Some engines make an enormous amount of torque and will slip the brake when the dyno tries to hold it at low rpm.

Also, there's no use in pulling an engine down to 2500-3000 when it makes peak torque at 5000-5500 and peak hp rpm at 7000-7500. You are really gaining nothing in data and could potentially cause harm to the engine by loading it that hard at a lower rpm.

We start the pulls on a per engine basis. On engines such as this, the pull would probably start at 4000-4500.

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PostPosted: Fri Mar 04, 2016 1:59 pm 
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got cha. Ya I just heard this rummer before and some people have said you can fudge what the actual output is cause you are already getting the engine closer to its VE and not making it work harder in the lower rpm range. Good to know Brent!!!


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PostPosted: Fri Mar 04, 2016 2:04 pm 
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Biggest problem I see is with the various brands of dynos. Superflows have a reputation of being higher than DTS and Stuskas.

It's not in the calibration, as anyone can hang a weight off an arm and calibrate, but I think the biggest problem is where the dyno computer is reading the ambient air temperature from. If it's reading it from the dyno cell, then it's thinking it's hotter outside than normal, and it will correct to a higher horsepower because of it.

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