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Estimated Power Increase...

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Old 02-12-2005, 07:36 PM
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Estimated Power Increase...
well people have asked me this question before but i cant answer it. maybe arch or jess will have an answer...

well right now i have about 160 horses and 200 pounds of torque at the flywheel. heres my cam specs: duration of 195/201, valve lift with 1.5 rockers of .394/.409, an LSA of 109*, and an intake centerline of 111.5*. the cam i'm getting has a duration of 204/214, valve lift with 1.6 rockers of .448/.472, an LSA of 112*, and an intake centerline of 107*. i dont know much detail on the heads cuz i dont have a CC or a flowbench...but i think the ports are both around 85 cc.

so anyway, based on this information what will my cam, 1.6 roller rockers and port and polished heads put out when i'm done?
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Old 02-12-2005, 07:41 PM
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I've heard of bench-racing, but never bench-dynoing.

If you want a guesstimate anywhere NEAR accurate, grab a copy of Dyno2000 or Desktop Dyno, and play with that. Torque is usually off, but the horsepower specs are usually within 5 hp or so.
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Old 02-12-2005, 07:52 PM
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looks like around 250 hp or so
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Old 02-12-2005, 07:59 PM
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On a 3.4L?!
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Old 02-12-2005, 08:04 PM
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yeah i have desktop dyno and tried it...i got less than the power i have now, so somethings not right. but arch...did you say 250 hp???
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Old 02-12-2005, 08:23 PM
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Old 02-12-2005, 09:26 PM
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pretty good! I was gonna say ask arch I think he has desktop dyno
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Old 02-12-2005, 09:35 PM
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yep my dd got 250 hp, but that was guestimating the valve size
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Old 02-12-2005, 09:42 PM
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thats pretty sweet
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Old 02-12-2005, 09:50 PM
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the gp with the cam it has comes up at almost 400 hp with a few easy mods with all stock parts it's about 300
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Old 02-12-2005, 10:47 PM
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The 3.4 heads are some of the worst so you can expect some nice gains.
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Old 02-12-2005, 11:30 PM
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yeah thats what insired me. oil_pan_4 from camarov6.com called em a waste of cast iron cuz the ports were so small.
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Old 02-12-2005, 11:51 PM
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wow thats a huge gain in power if you get 250 out of a 3.4 with them mods. bad ***
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Old 02-12-2005, 11:56 PM
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mostly in the heads and cam don't forget the 3.4 head flow file doesn't exist so I had to make it up so it may be a little high (that was as low a number as I could do for the heads)
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Old 02-13-2005, 12:07 AM
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dude caleb if you can get 250+ out of a 3.4 then you're the man lol
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