Please desktop dyno this 454 wo/aftermkt heads that ran a 13.1 on its 2nd 1/4 ever - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-16-2003, 01:56 PM
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Arrow Please desktop dyno this 454 wo/aftermkt heads that ran a 13.1 on its 2nd 1/4 ever

Could a couple of you guys run this through your desktop dyno software for me? The desktop dyno-like program I have is MIA. I appreciate it and would really appreciate it if you could post the output at each rpm level so I know the torque curve. Pesky, aren't I?

(This is for a project so what's in quotes is the seller describing it)

"The motor is as follows.... 1974 454 bored .030 over, Federal Mogul Hyper pistons with a .100 dome. 20/20 cast crank with King bearings, HV oil pump, Fel Pro gaskets throughout, double roller timing chain. The heads are 781 Large oval ports. stock 2.06/1.78 valves, "cleaned" the casting flash, wouldn't really call them ported, Crane valvesprings shimmed to 1.875 installed height, Crane exhaust rotators. the cam is a Crane Powermax 286....specs are 226/236 534/553. It's top with a Performer 2.0 intake and a 3310-2 Holley 750 Vac. Secondaries carb. I added a Proform Mainbody so according to them it is suppsoed to flow around 870. HEI distributor with Accel cap, rotor, and coil and race 300+ wires. Weiand water pump, new 94A alternator and starter, and B&M 14" flexplate"

"New Hooker comp headers 2" primaries and 3 1/2 collectors
Dual 3" with h-pipe to 2 Flowmaster 40 series, with 2 1/2 tailpipes" !!!

Now that's all you need for a flywheel hp number from the program, but for some of you knowledgeable rodders who donˇ¦t mind sharing your guesstimates, here's a little more to go by for making a non-desktop dyno guess about hp and e.t.'s.

"Centerline Convo Pros 15X4 front with 165 radials and 15X 8.5 rear with 275/60/14 BFG Drag radials."

"T350 w/ heavy duty clutches, shift kit, deep trans pan, B&M adjustable vacuum modulator, and a 10" 3200 stall"

"Corporate 8.5 NON c-clip axles, Richmond 3.73 gears, clutch style posi, new pinion bearings and races, and the carrier bearings and races."

"1972 Cutlass weighing in at 3900-4000 lbs with driver" (he's got a Cutlass too)

From looking at the timeslips below, my estimate was around 300 rwhp and around 375 flywheel hp, but like I said, I would like some other hotrodderˇ¦s opinions. This car has been a street demon, but he did take it down the quarter 4 times one warm, windy day and here are the times he knocked off.

Timeslips

"first run ever with the car: RT 1.030 60 2.009 1/8 8.543/81.901 1/4 13.387/100.396
second run; RT .833 60 1.869 1/8 8.299/82.341 1/4 13.128/100.014
third run: RT .831 60 1.961 1/8 7.995/88.590 1/4 12.505/103.650
last run: RT .807 60 1.785 1/8 7.906/87.584 1/4 12.415/108.061"

(3rd and 4th run were him trying a 100 shot of nitrous so disregard)

"was run at altitude 700, horrible 50 mph headwind, and probably 75 degrees"

"spinning a little off the line on all runs"

"I never hammered it off the line since I drove it 200 kms. (round trip) to the track and back. If someone was gung ho off the line, I'm sure it would be capable of 1.6X 60's."

"After talking to the regular guys that go every weekend, due to the wind, most of them were saying they were running 3-4 tenths off their usual. I'm taking my slips at face value, but I wish I would have went on a better day as I'm sure 12 second motor passes and maybe just getting an 11 on the bottle would have been possible."

(What guys don't say they're running 3-4 tenths off their usual but let's say they were a little off)

(suspension: regular shocks, etc)

I'm looking for some numbers to play with for desktop dragstrip which I have and I'm also interested in hearing you guys edumacated guesses about what kind of e.t.'s this thing is really capable of.

I'm looking for consistent 12.0s-12.5s on drag radials, if traction isn't a problem (which I'm sure it will be even on drag radials...) at an altitude of 615, let's say a temp of 60 degrees, nice crisp air, and no wind. Good conditions. Nice prepped track. This is a whole other project so just go with the specs for his driveline,etc.

So 2 things:

1st, those of you who have the program, please give me a desktop dyno estimate. Like I said, I would love to know the numbers at each rpm level if you have the time to paste them in.

2nd, tell me what you think this combo is capable of running at the track like its setup now.

I'll be honest, I'm a little amazed it ran the times it did with non-aftermarket heads. But I guess my experience is more with small block non-aftermarket heads which usually

Thanks,

Erik

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Old 12-16-2003, 02:20 PM
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Your right on about 300 to the wheels.

Cstraub
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Old 12-16-2003, 02:37 PM
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Forgot to add: Anyone ever heard of decreasing the exhaust as it goes back like this?

Huge 2 inch primaries to 3.5 inch collectors to 3 inch duals back to right before the rear wheels where the exhaust diameter changes from 3 to 2.5 coming out the mufflers to the back
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Old 12-16-2003, 03:55 PM
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I qwould think that restricting the exhaust would only help out low end a little. To big an exhaust and youll loose tons of low end. HG
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Old 12-17-2003, 09:31 AM
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All desktop dynos broken?

I know, I ask for a bit much and a bit longwindedly

I appreciate our putting up with me though.

-Erik
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Old 01-02-2004, 09:59 PM
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Would this 454 get lower e.t.s with the exhaust uncapped?

The exhaust setup is nice for the street and low end torque friendly, but would cutouts help drop the e.t. any at the track?
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Old 01-03-2004, 08:37 AM
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I setup your build on my desktop dyno, and for you use, if you go ahead and PM me your e-mail, I'll send pictures of the graph and chart that it came up with so that you can actually see it, instead of me typing everything out. I did this with someone earlier on this site, and it worked fine. I'll just wait for your response and send 'em when you let me know.
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Old 01-03-2004, 01:24 PM
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elukas,
i ran your engine through with 10:1 comp. , large tube open exhaust, single plane intake, 850 cfm, pump gas, 2.08-1.73 valves, hyd cam, 4.281 bore, int and exh. lift @ .600" timing at +13 degrees.

result= @5000rpm 476 lb/ft. and 453 h.p.
@6000rpm 495 h.p. and 433 lb/ft.

a roller cam put it well above 500hp

judging the power loss at the rear wheels my opinion is your looking at 350-395hp.

hope this does any good
bondo
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