Brison 2.4
02-11-2003 | 03:54 AM
#26
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From: Locust Grove,
GA
Brison 2.4
I did this with a G45 and increased my engine speed by 800rpm. It was wild!
Originally posted by Diablo
My Brison 2.4 would turn a Mejzlik 20x10 @ 7100 rpm - that's open exhaust (no muffler). A ZDZ-40 (rotary valve) with a B&B muffler (?) turns the same prop @ 7600 rpm. The point is that there is free power available if you can put a less restrictive muffler on these engines. Check your rpm open exhaust and compare to your muffler - you may be surprised.
My Brison 2.4 would turn a Mejzlik 20x10 @ 7100 rpm - that's open exhaust (no muffler). A ZDZ-40 (rotary valve) with a B&B muffler (?) turns the same prop @ 7600 rpm. The point is that there is free power available if you can put a less restrictive muffler on these engines. Check your rpm open exhaust and compare to your muffler - you may be surprised.
02-11-2003 | 09:45 PM
#29
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Brison 2.4
The chain saws these things are made from routinely rev to over 10,000...There's a small Husky that's advertised to turn 15,000 rpm unloaded...I don't think we need to worry about 8000 rpm being too high.....
Repair manual for the Zenoah 62 cc chainsaw says to check rpm on the saw, don't go over 13,500 unloaded..The chainsaw cranks WILL stand it..Maybe Brison, Fox, Fpe, etc are concerned that their cranks and rods won't take it.....
In 15 years of playing around with gassers I have not heard any detonation...Timing much over 30 degrees results in missing and slowing down..I HAVE seen holes in pistons from too much nitro in glow conversions....Any engine timed far enough advanced for detonation would't run very well anyway, regardless of octane....I ran some 100LL from the airport, not much difference....
Right TKG ????
Repair manual for the Zenoah 62 cc chainsaw says to check rpm on the saw, don't go over 13,500 unloaded..The chainsaw cranks WILL stand it..Maybe Brison, Fox, Fpe, etc are concerned that their cranks and rods won't take it.....
In 15 years of playing around with gassers I have not heard any detonation...Timing much over 30 degrees results in missing and slowing down..I HAVE seen holes in pistons from too much nitro in glow conversions....Any engine timed far enough advanced for detonation would't run very well anyway, regardless of octane....I ran some 100LL from the airport, not much difference....
Right TKG ????
02-12-2003 | 03:14 AM
#30
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From: Altoona,
IA
Coleman fuel in the gassers
ralph , what is your opinion on running coleman white gas in our gassers fpe Brison ect.?? i like it because it doesnt give a head ache like regular unleaded does . thanks Bruce S
02-14-2003 | 04:50 AM
#32
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From: Altoona,
IA
Brison 2.4
Havent had a chance to run Jimmys B 2.4 yet its winter here to cold will let you know when he checks it out did you do the same things to his as mine New plug ect.???
