Thread: Dyno Combo Results

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Hi Guys/Gals.

I've been working on a 355 engine and don't know anyone with a dynosim 5, apparently they are pretty accurate.

Would someone be able to run my combo and see what comes up?

350 + .030"
Hyper d-cup piston with .018" dish
Edelbrock E-Tec 170 heads (1.94 intake/ 1.55 exh.)
64 cc- should be 9.0:1
Howard Cam -hyd. retro roller
.525 int/.532 exh.- dur@.050 226/234 -LSA 108
1.5 roller rockers
Edel. airgap intake
Holley 650 dbl. pump
1-5/8" headers

Thats about it, going to be for the street, nothing outrageous.
Wanted something with bottom end to play with.

Thanks, if anyone could help me out.

Originally Posted by kool

Hi Guys/Gals.
I've been working on a 355 engine and don't know anyone with a dynosim 5, apparently they are pretty accurate.
Would someone be able to run my combo and see what comes up?
350 + .030"
Hyper d-cup piston with .018" dish
Edelbrock E-Tec 170 heads (1.94 intake/ 1.55 exh.)
64 cc- should be 9.0:1
Howard Cam -hyd. retro roller
.525 int/.532 exh.- dur@.050 226/234 -LSA 108
1.5 roller rockers
Edel. airgap intake
Holley 650 dbl. pump
1-5/8" headers
Thats about it, going to be for the street, nothing outrageous.
Wanted something with bottom end to play with.
Thanks, if anyone could help me out.

Couple of things to fix first.
Pistons: If you're talking about KB D-cups, they are 18cc (eighteen cubic centimeters), not 0.018" (eighteen thousandths of an inch).
Howards cam: I can't find this grind. I need to make sure on the LSA in order to figure the valve timing figures to enter into the DynoSim. Most of Howard's cams are ground on a 112 LSA, not 108. I have not seen a Howard's retrofit for a small block with the figures you have shown here. Where did they come from? Can you give me a link?
Carburetor: Why the double pumper? Are you planning to use a loose torque converter? 3000+ stall? Car would make better fuel mileage with a vacuum secondaries carb, would make same top end hp and work better if you're using a converter tighter than 3000.
Intake manifold: Car will make more useable power with a taller intake manifold such as the Edelbrock RPM AirGap Vortec #7516 in the range of 1500-6000.
Do you have any of the parts bought yet?

Oops,

The cam is #110325 @ 110 LSA, I took wrong info from 110325-08
Called Howard Cams and thats what he said I would like for a heavy car.

http://www.howardscams.com/index.php...=193&Itemid=37

Piston is -18cc not .018"
Double pumper- because thats what I have for now, can always change (easy bolt-on)
Edelbrock RPM AirGap Vortec #7516 to match heads

These parts are already bought and paid for

Thanks techinspector1

RPM HP TQ
2000 142 374
2500 180 379
3000 229 401
3500 285 427
4000 335 440
4500 375 438
5000 403 424
5500 410 390
6000 379 331
Peak volumetric efficiency 93.0% @4500
Peak BMEP 186.5 @4000
Edelbrock used these heads with a little different cam and a little more compression to make 435/435.

Thank You techinspector1

I appreciate the time, dynosim 5, pretty accurate you think?

Originally Posted by kool

Thank You techinspector1

I appreciate the time, dynosim 5, pretty accurate you think?

I always factor the heads by .95 from the published flow numbers, just to try to be more realistic. The hard-core dyno pulls I have been able to simulate come in around 2% plus or minus.