Dyno Results: 502 w/ AFRs
05-15-2014, 05:44 PM
#51
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The air/fuel numbers were calculated. Good catch sb. A close eye was kept on egt's and we kept jetting up until we did not gain any power. On this dyno mid to high 13's seems to be the sweet spot for power on bbc's and equates to low 13, high 12's when measured with a wideband. I have the wideband and bungs ready for the tails to fine tune it in the boat. I'm pretty confident the actual air fuel in the boat will be very close to mid 12's.
05-15-2014, 10:01 PM
#52
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Jammie avg. egt,s @ 1468 seems a bit tall, yes ? __ did you guys try 32* on the clock?
Last edited by I'CE; 05-15-2014 at 10:04 PM.
05-15-2014, 10:22 PM
#53
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No, by the time it richens up into the 12.4-12.8 range egt's are going to drop 100* or more. Lowering timing will increase egt by starting the burn later and causing the burn to still be on going while the exhaust valve is opening. Could go to a -8 plug but I prefer 7's and running 93 octane
05-15-2014, 11:00 PM
#54
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so the 1468 avg. is not the temps on the best run, what was the avg. you ended up with thanks. 7 lbs fuel on the posts correct ? the 8 plug could help. make sure Mr. dyno runs 93 don't let him cheat. lol
05-15-2014, 11:02 PM
#55
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dyno water temps 140+ he's fresh water cooled @ 155 +- so will he pick up a few hp
05-16-2014, 07:32 AM
#56
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7lbs of fuel pressure, egt's just broke 1400 at the top end of the pull. I don't have the sheet in front of me but I think it was 1370? At peak power.
05-16-2014, 10:13 AM
#58
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J, would have liked to see your carb. on top just for the #'s thanks cu in a bit. have fun in Fl..
Last edited by I'CE; 05-17-2014 at 08:52 AM.
05-16-2014, 10:13 AM
#59
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I did on a 548 last week with the same heads and quench, same style piston. Power didn't go up, actually lost some at 36* and egt's only dropped a few degrees. Most of these guys fill up on the road with 93 octane which I prefer, more additives etc. less chance of getting a bad tank of fuel. So I don't mind running a little hotter plug, a little lower air fuel and the temps fall in line. Without fouling plugs or poor idling.
05-17-2014, 08:59 AM
#60
Registered
did the 548 near 665hp? thanks so much on 242's engine builds your good to go, now he must be careful on the sticks. any prop talk yet ? or just spin em.
