12a PP dyno
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04-08-11, 05:49 AM
#8
Senior Member
The id of headers is 48 mm and 800 mm long with 15 deg collector and one 3" straight thru muffler- RB dizzy with 2 MSD 6AL2 (the new version)Blaster 2 coils. 48 mm IDA carb with 42 mm chokes. ID in rotor housing is 43 mm venturi. Problem was that the carb leaned out over 8000 rpm to 14.8-15.2 AFR. We rejet it from185 main to 290 with lots of fuel curves, even bored out the needle valve to 3.3 mm, but same problem occured. The exhaust temp was 1420-1440F, almost identical which i've never seen before with a dizzy. Timing was 24L16T. Not satisfied with these numbers i will go back to the dyno in about a month. Hopefully the fuel curve is sorted out and 280 hp is achived...
04-08-11, 03:03 PM
#9
The id of headers is 48 mm and 800 mm long with 15 deg collector and one 3" straight thru muffler- RB dizzy with 2 MSD 6AL2 (the new version)Blaster 2 coils. 48 mm IDA carb with 42 mm chokes. ID in rotor housing is 43 mm venturi. Problem was that the carb leaned out over 8000 rpm to 14.8-15.2 AFR. We rejet it from185 main to 290 with lots of fuel curves, even bored out the needle valve to 3.3 mm, but same problem occured. The exhaust temp was 1420-1440F, almost identical which i've never seen before with a dizzy. Timing was 24L16T. Not satisfied with these numbers i will go back to the dyno in about a month. Hopefully the fuel curve is sorted out and 280 hp is achived...
Your EGT temps are too low and that choke is really small unless you want alot of bottom/midrange power. I notice you fall off at 8000rpm. That is pretty low for a pport. I would try a larger choke. AT least a 45- 46mm.
04-09-11, 12:10 PM
#12
E85 Addict
Thread Starter
made a new header that will be on a 12a BP motor that will be dynoed this tuesday.. its a little shorter (600mm) but will be adjustable up to whatever length it likes.
04-17-11, 01:26 PM
#13
Senior Member
Did some dyno testing with a 12A standard bridge engine.235 stp corrected@9000 rpm and 210 Nm@7200 rpm. Same 48 IDA as on the 12a PP ,motor but with 44 mm chokes and 250 main and 140 air jets. ignition made best power at L25 T18 with the MSD 6AL2. The primaries was the same as on the PP motor.
/Lasse
/Lasse
09-09-22, 08:37 AM
#16
New to the Club!
Did some dyno testing with a 12A standard bridge engine.235 stp corrected@9000 rpm and 210 Nm@7200 rpm. Same 48 IDA as on the 12a PP ,motor but with 44 mm chokes and 250 main and 140 air jets. ignition made best power at L25 T18 with the MSD 6AL2. The primaries was the same as on the PP motor.
/Lasse
/Lasse
Hello! Could you send me information about the structure of the complete ignition? Have a 12A PP built after the pattern of Mazda Race, he runs well....but with the original ignition is from 6000 RPM end and there the power should only begin ... Carburetor is a 48er Weber ... Thanks in advance - Charly
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