GO4BROKE

iTrader: (1)

I plugged in all the stock #'s for a merc 525sc, but I'm not getting the right power #'s. My stock 454 mag came within 1 hp of its rated power when I ran it on desktopDyno. Heres a summary:

Engine: 454 4.251"x4.000"
Heads: Stock Merc rectangular port cast iron
Compression: 7.5:1
Induction: [email protected]"hg, Weiand 177, belt gear ratio 2:1, 55% eff
Exhaust: default to Forced induction exhaust
Camshaft: Crane#132561 530/551 lift, 298,306 advertised duration, using seat to seat

Griff

What results are you getting?????? WOT operating range is 4800-5200rpms.

GO4BROKE

iTrader: (1)

Desktop dyno horsepower estimates, stock 525sc:
4500rpms=444hp
5000rpms=486hp
5500rpms=510hp

Way low #'s. Ive had good results with other motors.

Griff

I'm guessing that #'s at 5200 are probably real close to 500hp. Based on that the desktop #'s are only off by 5%. I don't think 5% is THAT far off. Could it be the blower efficiency # or the exhaust causing the difference????

I know puder had an engine with pretty close to 525SC specs and it dynoed at 550hp+/-. If I remember, he had a little more cam and comp ratio.

Scott

CAM TIMING
@ .050


Try this instead of Seat to Seat

I'm guessing here so bare with me

Try This link

mcollinstn

I've never gotten useful numbers with Dyno2000 using .050" numbers. Seat-to-seat has been much closer to known figures for known setups. Don't know why, but this has been my experience.

GO4BROKE

iTrader: (1)

Seat to seat has worked best for me, but I'll experiment to see what happens with the 525 simulator.