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Old 01-23-2009, 10:39 PM
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need a quick dynosim cam comparison

ok, i cant seem to find my dynosim, so i need a little help. Im switching cams and i need a comparison.
Engine:
-Chevy 355ci (350ci .030" overbore)
-stock Iron GM 1.94 heads, 74cc
-flat top pistons w/ four valve relefs
-CR: est. 9.5:1
-basic Fel-Pro head gaskets
-Holley 650 Vac
-dual plane intake
-shorty headers w/muffs

Cams:
Current:
Blue racer 280-2H
Lift- Int: .442 Exh: .465
Timing @ .050": 0.0 BTDC 34.0 ABDC
49.0 BBDC 5.0 BTDC

New cam:
Comp Cams 275DEH
Lift- Int: .462 Exh: .482
Timing @ .006": 32 BTDC 63 ABDC
73 BBDC 24 ATDC


Thanks for the help.

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Old 01-24-2009, 01:14 AM
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blue racer 280. sorry didn't have flow for stock heads just assumed 882 head with 1.94 and. 1.50 vavle with standard flow intake. small tube headers and mufflers.2003 dyno. mech efficiency at max 90.1% @2000
rpm hp tq
2000 139 366
2500 181 380
3000 223 390
3500 266 399
4000 304 399
4500 334 389
5000 349 366
5500 343 328
6000 320 280
275 cam same set up as above.
max mech efficiency max at 89.4 @ 2000.
rpm hp tq
2000 129 339
2500 167 350
3000 209 366
3500 257 386
4000 300 394
4500 333 389
5000 354 371
5500 352 336
6000 331 289
6500 299 242

both installed straight up. no fancy tuning. hope this helps.
I think I like the torque curve of the first one at cost of a couple hp.
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Old 01-24-2009, 02:15 AM
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hmm, this is not what i wanted to hear, lol. i guess i've got some more shopping to do, ill come back tommorrow with another one. Thanks for the speedy reply.
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Old 01-24-2009, 02:34 AM
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Quote:
Originally Posted by automods
hmm, this is not what i wanted to hear, lol. i guess i've got some more shopping to do, ill come back tommorrow with another one. Thanks for the speedy reply.
You can go to Comp's site & download their Camquest6 program free. http://compcams.com/camquest/default.asp
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Old 01-24-2009, 07:48 AM
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You need to give the cam duration specs at the same lift.

The first cam, you gave the at 0.050" duration and the second cam you gave the at 0.006" duration.

The compcam will make more power because it is a modern aggressive cam. However, expect more valve train noise and it will be at more risk to go flat.

Make sure to use ZDDP oil additive with any performance cam!!! Only cost another 10 dollar at each oil change.
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Old 01-24-2009, 07:18 PM
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Quote:
Originally Posted by 454C10
You need to give the cam duration specs at the same lift.

The first cam, you gave the at 0.050" duration and the second cam you gave the at 0.006" duration.

The compcam will make more power because it is a modern aggressive cam. However, expect more valve train noise and it will be at more risk to go flat.

Make sure to use ZDDP oil additive with any performance cam!!! Only cost another 10 dollar at each oil change.
Im just giving the info on the cam cards, but i will def pick up some ZDDP, thanks for the tip, I am also considering going with a solid cam, this is far from a daily driver, i use it at the track and on weekends for fun and im runnin a stick so i dont have to worry about converters. what do you guys think? any suggestions for a good combo?
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Old 01-24-2009, 07:25 PM
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Better heads, Vortec heads & intake are a nice cheap upgrade for around 30-40HP.
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Old 01-24-2009, 07:25 PM
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Quote:
Originally Posted by SSedan64
You can go to Comp's site & download their Camquest6 program free. http://compcams.com/camquest/default.asp
great link, thanks
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Old 01-25-2009, 07:36 AM
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what gears? what stall? how heavy?

yes, stock heads suck.

vortecs are nice but cost extra for the vortec intake, center bolt valve covers, and vortec rockers. So it is a better deal to get a set of darts if you already have these things.
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Old 01-25-2009, 11:01 PM
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Edelbrock's RPM air gap is supposed to be the best on the market for intakes. I think it was Hi performance Chevy magizine that tested them last summer. They tested 16 intakes on the same engine. No tuning set to the same timing. (I think they had 2 standards for carb jetting and timing. dual and single plane.) The Air gap won the dual plane and came in 3rd in for total HP in the single plane. The max power was reached about 1000 rpm early than the victor or the hurricane but hard to argue with results. They didn't make a big deal about it because edelebrock and holley are big sponsors adn they can't afford to make either mad. They didn't comment just posted the dyno charts and said "take it for what its worth.

I have heard that the air gap doesn't work well in cold climates. The intake never warms up so it constantly hesitates in the winter, above 60 degrees it is great.
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Old 01-25-2009, 11:49 PM
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i used Camquest and found what i think is the best cam for my configuration, XE284H with Comps 981 beehive springs, i went through pretty much all the cams for my application made by Comp, this one stood out, it makes the most Avarage HP and Tq, and i like the curves. Another that stood out was the 280AH-8, this is a circle track cam, but it bumped my avarage HP over 100, it was the only hydraulic to do so but i cant find any info on it, the site doesnt even have a spec card for it and noone aswered the phone when i called their support line.
I hear the Extreme Energy line uses the latest technology and i looks like a pretty good choice without changing anything else on the engine.
FYI, The car weighs 3360lbs w/driver, its a stick... so no stall, and im runnin 3.73 gears.
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Old 01-26-2009, 12:24 AM
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Quote:
Originally Posted by automods
i used Camquest and found what i think is the best cam for my configuration, XE284H with Comps 981 beehive springs, i went through pretty much all the cams for my application made by Comp, this one stood out, it makes the most Avarage HP and Tq, and i like the curves. Another that stood out was the 280AH-8, this is a circle track cam, but it bumped my avarage HP over 100, it was the only hydraulic to do so but i cant find any info on it, the site doesnt even have a spec card for it and noone aswered the phone when i called their support line.
I hear the Extreme Energy line uses the latest technology and i looks like a pretty good choice without changing anything else on the engine.
FYI, The car weighs 3360lbs w/driver, its a stick... so no stall, and im runnin 3.73 gears.
http://www.compcams.com/Cam_Specs/Ca...?csid=142&sb=0
Cam Grind #----Cam Part #
280AH----- or--12-325-4--Best for heavy car,short track,works with stock valvetrain
3000-6000rpm range, Dur.@.050 =IN.232/EX.237, Lift=IN.483/EX.483
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Old 01-26-2009, 12:40 AM
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Quote:
Originally Posted by SSedan64
http://www.compcams.com/Cam_Specs/Ca...?csid=142&sb=0
Cam Grind #----Cam Part #
280AH----- or--12-325-4--Best for heavy car,short track,works with stock valvetrain
3000-6000rpm range, Dur.@.050 =IN.232/EX.237, Lift=IN.483/EX.483
wow, thanks, i clicked the link wheni was looking so many times and it said it was unavalible. I like that the 280AH uses the stock valvetrain, but iv never heard of it. anyone?
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Old 01-26-2009, 11:53 AM
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use a 2800 rpm stall with that cam.
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Old 01-26-2009, 12:30 PM
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Originally Posted by automods
wow, thanks, i clicked the link wheni was looking so many times and it said it was unavalible. I like that the 280AH uses the stock valvetrain, but iv never heard of it. anyone?
It's in my 2000 Comp catalog so it's not new. Just in the circletrack cam section with many others. Usually the camcard wont show up if you use the Grind#, have to use the Cam part#.
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