DesktopDyno users find my mistake
#1
Charter Member #1055/Moderator
Charter Member
Thread Starter
DesktopDyno users find my mistake
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
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
__________________
[img][/img]
[img][/img]
#3
Charter Member #1055/Moderator
Charter Member
Thread Starter
Desktop dyno horsepower estimates, stock 525sc:
4500rpms=444hp
5000rpms=486hp
5500rpms=510hp
Way low #'s. Ive had good results with other motors.
4500rpms=444hp
5000rpms=486hp
5500rpms=510hp
Way low #'s. Ive had good results with other motors.
__________________
[img][/img]
[img][/img]
#4
Charter Member # 55
Charter Member
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.
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.
#5
Charter Member #30
Charter Member
__________________
I have Steps & Bubbles!
I have Steps & Bubbles!
Last edited by Scott; 03-02-2003 at 08:49 PM.
#6
Platinum Member
Platinum Member
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.
#7
Charter Member #1055/Moderator
Charter Member
Thread Starter
Seat to seat has worked best for me, but I'll experiment to see what happens with the 525 simulator.
__________________
[img][/img]
[img][/img]