Initial 408W dyno results

quote:

Originally posted by Throttled:
The 408W for # 3190 is alive!! It went to the dyno late yesterday evening. With the tuning roughed in the results showed some promise. We will see what more tuning will do.

So far the numbers seem low on hp but good in torque. We ran the engine to 5700.

HP - 410.1
TQ - 484.9

It is a hydraulic roller engine. The cam is a Trick Flow stage 2. I don't remember the specs off the top of my head.
Scat 9000 steel crank
Scat H-Beam rods
Forged KB750 pistons
Performer RPM air gap intake
RHS 215 heads with 64CC chambers
10.6:1 compression
Holley 750dp
PI headers
MSD ignition stuff

Do you have a dyno sheet? A 1:1 CI to power ratio does not seem bad to me. The thing to is how wide is your power band. A wider power band at a lower power setting may be as usefull or more usefull then more power at a higher more narrow power band.

Gary

I will have the dyno sheet later today as soon as we get the final numbers. I can post them. The great news is that the power curve is very flat. When it hit 410 hp it showed up four times in a row. The torque was pretty similar. I wanted a flatter power curve and it looks good so far. I will post the sheet as soon as I have it. The dyno is a superflow 901.

I think it sounds great!

Gary

Thanks! I am pretty excited. ...Just wish it would be ready for Vegas you know?

Post the cam specs too when you get a chance. Congrats on your engine!

Here are the cam specs:

Trick Flow cam 224/232 dur @.50 .542/.563 lift Hydraulic roller

Timing is at 32 degrees at last test

Today there was a problem...

The engine made 453.5 hp @ 5200 with 486.5 lb/ft of torque before finding out that air was leaking past the valves. It has to be torn back down to see what is going on. This is like dangling candy in front of a baby!

That's a good torque number, a wide flat torque curve peaking at 484 ft/lbs is good. The low bhp number just indicates the power band is focused at lower rpm, doesn't mean the motor is a dog.

cowboy from hell

I think it is under cammed quite a bit.

The powerband of a cam designed for a 351 cubic inch motor will be shifted 1000 rpm lower with a 408 stroker.

cfh

Where did the big increase in HP come from? 410 to 453 is a big jump! This could be quite a monster doing those numbers before it is even running right!

Art


The engine made 453.5 hp @ 5200 with 486.5 lb/ft of torque before finding out that air was leaking past the valves. It has to be torn back down to see what is going on. This is like dangling candy in front of a baby![/QUOTE]

The increase came from a change to 30 degrees from 32 for timing and a little more carb adjustment. The timing changes are making big changes on the dyno. I received the latest news via phone as I was at the office. I wonder if it is having valve bounce from weak srpings or ? that would cause the air leak through the exhaust valves.
I would like to see what a little hotter cam would do for it. For now I am just going to run with it. As soon as I have the final dyno results I will post them here.
Thanks guys for letting me share my excitement with you. My car has been in restoration since I bought it. I have yet to drive the car.

- Marc