Thread: Dyno Guys

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small block? intake center-line? rod length?

DADNOVA... with the new flow metrics, you're getting 511hp@6500 and 498tq@4500 but I'm still assuming ICL 110* and 6.544 rod length (1.636:1 rod ratio probably too long?).. I think it's safe to say you'll be making somewhere around 500/500 with that motor.

-Chris

Originally Posted by DADNOVA

[Can you help me with the HP on your dyno with this configuration

Block-dart 9.325 deck, bore 4.125 cubic inch 427
Heads- AFR 227 68cc chambers int. 2.1 ext. 1.6 full race ported
lift flow int ex
.2 138 112
.3 207 150
.4 258 190
.5 294 207
.55 298 213
.6 302 220
.65 305 225
.7 309 230
crank- bore 4.125 stroke 4
carb- 750 demon
pistons -JE dish .115 comp 11.25
cam -roller int dur. 292 ex 302 lob sep 112
Int duration 292
Ex duration 302
Int lift at cam .403
Ex lift at cam .398
Total lift int.604 ex 597
rockers -jessel 1.5 total lift int .604 ex .597
headers -1 5/8 pipes 3" H pipe installed
intake -performer rpm duel plane
elec -fan and water pump[
Does that help

You don't need a Jessel system.
All you really need is a good 7/16 roller rocker with a girdle.
Save the money for something else.

Originally Posted by skids72

DADNOVA... with the new flow metrics, you're getting 511hp@6500 and 498tq@4500 but I'm still assuming ICL 110* and 6.544 rod length (1.636:1 rod ratio probably too long?).. I think it's safe to say you'll be making somewhere around 500/500 with that motor.

-Chris

6.544 rods??????

Erik... I know... sounds too long but I was working from the 1.636 rod ratio for lack of a better idea... would need a really tall deck for that(?)

-Chris

Originally Posted by skids72

Erik... I know... sounds too long but I was working from the 1.636 rod ratio for lack of a better idea... would need a really tall deck for that...

-Chris

Based on a 9.20 deck height about the longest rod you can run is 6.250.
In the large stroke engines 6.125 is about it.
What happens is due to the stroke and rod length the piston pin location gets up into the bottom compression ring on the large cube engines.
Are you calculating compression distance
DECK HEIGHT - 1/2 STROKE - ROD LENGTH - DECK CLEARANCE = COMP. HEIGHT ??

6 ince rods
What program are you using?
My freinds Virtural Engine Dyno shows 700 HP with 670 tourqe.
Guess I will have to take it to a Dyno shop and spend the money.

I'm just using swept volume and tweaking combustion space (chamber+gasket+dome/dish+deck height) to get the target compression of 11.25:1 ... didn't want to make a dissertation of this or anything. BTW using a more realistic rod (6.1" for 1.525:1 ratio) makes 508hp/496tq in the simulation (not much difference).

Thanks... I'm still pretty new to this and trying to learn most I can from you guys that have been there.

-Chris

DADNOVA - 700HP eh? Do you know intake lobe center line for that cam? I'm just plugging in numbers here. I'm treating your 292/302 as seat-to-seat duration. BTW I would be very surprised if you're making 1.6HP/ci in a stroker with 11.25:1 compression...

Originally Posted by DADNOVA

6 ince rods
What program are you using?
My freinds Virtural Engine Dyno shows 700 HP with 670 tourqe.
Guess I will have to take it to a Dyno shop and spend the money.

One of our 434's on meth. just cracked the 700 hp barrier.
That is with 14 to 1 comp ratio and fully CNC'D 23* Brodix heads and very stout roller cam.
This is why I hate some of the dyno sims they are a joke.
There is no way you will go to 700hp.
You still did'nt give the cam's duration at .050 so there is no real way to figure any of this.