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Old 08-14-2007, 06:08 PM   #1 (permalink)
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Dyno tested mild 351w

Hi folks, Dynoed my mild 351w yesterday, lot of potential there...

Holley 650DP, 4777
Edelbrock Performer RPM Air-Gap
ProComp 185cc, 2.06/1.6, hand blended 66cc
Comp 972 double springs with damper
Crane 1.6 rockers
Comp 280H Magnum, hydraulic cam: .512 230@.050
Stock type pistons, .030, four valve reliefs
Stock Rods with ARP bolts
Stock Crank, stock damper
Mallory unilite with mallory coil, Accel 300+ wires
Mechanical holley fuel pump

RPM FWHP TRQ
hp LbsFt (Nm)
2500 155 325 (440)
3000 205 354 (480)
3500 255 373 (505)
4000 285 369 (500)
4500 300 347 (470)
5000 310 332 (450)
5500 310 288 (390)
6000 290 258 (350)

The numbers are a bit low, donīt you think? The compression ratio, of 9.3 has something to do with it, leaving the dynamic compression too low for the cam. The engine was run 4 times, optimizing timing, nothing else was changed. AFR was ok, 0.9 (lambda) from 3000+

Planning to change it to stroker, increasing compression to ca 11.0. Maybe roller cam. Any other ideas??

Antti Nieminen,
Finland

Any other ideas?
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Last edited by Mosse; 09-14-2007 at 01:27 AM.
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Old 08-14-2007, 11:21 PM   #2 (permalink)
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Re: Dyno tested mild 351w

The air gap intake and 650 carb are costing you big! I would try just bolting on a 1000Hp or even a 950Hp carb. I've seen 20HP from a std 750DP to a 950HP with no other changes!!
Also might try 1.7 rockers if not too far out of your budget. That thing needs some air. The cam isn't that bad for the compression, unless your 4000ft. elevation.
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Old 08-15-2007, 08:12 AM   #3 (permalink)
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Re: Dyno tested mild 351w

Sounds like a good combo as is just isn't giving the numbers it should be, was the cam degree'd when installed? maybe try a bigger carb, those heads will flow more than what that 650 can feed it, if it's going in a street car I'd keep the Air Gap, but still think the numbers should have been a lot higher with it setup like that. What headers were used?

Your TQ numbers in ft-lb's would have read:
RPM HP TQ (ft-lb)
2500 155 325
3000 205 354
3500 255 372
4000 285 369
4500 300 347
5000 310 332
5500 310 288
6000 290 258
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Old 08-15-2007, 09:12 AM   #4 (permalink)
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Re: Dyno tested mild 351w

What correction factors where utilized?
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Old 08-15-2007, 12:17 PM   #5 (permalink)
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Re: Dyno tested mild 351w

From the wheels the max was 239hp.

Thx, for altering to ftLbs, a bit more informative for most of us...
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Old 08-15-2007, 01:41 PM   #6 (permalink)
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Re: Dyno tested mild 351w

Is this an Engine or Chassis Dyno your testing on?
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Old 08-15-2007, 03:30 PM   #7 (permalink)
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Re: Dyno tested mild 351w

Chassis dyno, 238Hp on wheels, 309 Fwhp

Altitude is not a factor in my country...
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Old 08-15-2007, 03:44 PM   #8 (permalink)
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Re: Dyno tested mild 351w

whats the rest of the combo? Transmission? Convertor? Rear Gearing? Tires?

I'm Asking because sometime chassis dynos can be off, I have a Small Block in my 91 LX mustang that runs mid 11's all day and can't push a MD dyno over 280 hp at the wheels. I've seen cars making a whole lot more on other dynos and running no where near as good.

You need to run the car at a track and see how it performs, that will be a much better indicator of the power you actually have.

Dynos are great for tuning but you can't believe the numbers all the time. Alot depends on the balance of your driveline, Correction Factors and the dyno operator.
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Old 08-16-2007, 04:22 PM   #9 (permalink)
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Re: Dyno tested mild 351w

I agree. the car is with Toploader, 8" 3:00 rear, tires are 225/50-15

The car ran 14.1 with street tires last summer, the same dyno gave 293fwHp, 225hp on the wheels.
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Old 08-24-2007, 01:27 AM   #10 (permalink)
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Re: Dyno tested mild 351w

Any thoughts about compression ratio with this cam. I suppose 10,5 would be close to optimum?

Next upgrade will be stroking it to 392 or 408 (no sense changing just the pistons to increase compression ratio) ,and porting the heads.
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Old 08-24-2007, 05:49 PM   #11 (permalink)
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Re: Dyno tested mild 351w

Why is the comb chamber so large? If it's for a stroker, it's much better to have a smaller chamber and dish the piston to compensate for higher compression. Also a set of 1.7s would definitely help.
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Old 08-25-2007, 03:54 PM   #12 (permalink)
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Re: Dyno tested mild 351w

3 major players in power-

Heads
Compression
Cam

Then details get you the rest.

Any idea what the Pro Comp heads flow and the port volumes?

Aluminum heads can tolerate more compression on pump gas, so you are a bit low, but it is tough to change now.

That is a decent cam, especially for your gears. What are your rpm peaks for TQ and HP?

Did you check the port match from your intake to the heads? If you can't see them by looking into the plenum, bend a piece of stiff wire and see if you can catch any edges due to a mismatch.
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Old 09-03-2007, 05:04 AM   #13 (permalink)
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Re: Dyno tested mild 351w

Quote:
Originally Posted by FasterDamnit! View Post
3 major players in power-

Heads
Compression
Cam

Then details get you the rest.

Any idea what the Pro Comp heads flow and the port volumes?

Aluminum heads can tolerate more compression on pump gas, so you are a bit low, but it is tough to change now.

That is a decent cam, especially for your gears. What are your rpm peaks for TQ and HP?

Did you check the port match from your intake to the heads? If you can't see them by looking into the plenum, bend a piece of stiff wire and see if you can catch any edges due to a mismatch.
The heads, after chamber blending and de-shrouding valves, have big volume. Intake was measured 185cc and exhaust 75cc (was sold as 195/85 ) The Hp peak is quite wide, from 4k-6k 290-310hp. Which I like on track. Even though peak hp didnīt go up more than 10 hp, The track time, On BotniaRing was down from 1:34,45 ->1:30,27. Only other upgrade was proper brakepads. Still some 40-50Hp lost?

I did port-match the intake,with FelPro 1262, 1-3mm grinding from the edges on RPM-intake. Maybe the they still need a proper porting? Some guys here have gotten good results on porting procomps...

The next step is to take it all apart (winter coming anyway) and stroke the engine to 392, this will take care of the compression issue. It would also benefit greatly of roller cam. Any thougth?
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Old 09-03-2007, 07:30 AM   #14 (permalink)
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Re: Dyno tested mild 351w

Have you played with the jetting of your carb yet? Sounds like to me you should be making atleast 400-410 FWHP, but won't get there if your carb is too lean. The 4777 is jetted very conservatly from the factory.
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Old 09-04-2007, 12:33 PM   #15 (permalink)
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Re: Dyno tested mild 351w

I also agree to swap that carb for at least a 750dp. I had a performer intake and carter 625 carb on my setup below and it was choking it!
I swapped to the stealth intake and 750dp and saw a big difference at the track. If I recall correct, it was worth another 4 tenths in E.T for me
FWIW, my current jetting on my 750 is 74/82 so you can run at least those with your setup.
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