engine problem
#1
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engine problem
i have a rossi 40 on my Q500, its have a venturi 9mm on it and nelson pipe. i can't turn the engine scharp, y can't set it on point? whats the probleme please?
#3
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RE: engine problem
hi, i use APC 8,75X7 0% nitro , rossi 4 en tettra bubbless tank
when i use yhe nelson pipe it wont turn scharp,its te fast lean.
i make the exhause on the sleeve 1mm bigger higher
the orginal pipe from rossi it turn better
sorry for my bad englisch i am from belgium
when i use yhe nelson pipe it wont turn scharp,its te fast lean.
i make the exhause on the sleeve 1mm bigger higher
the orginal pipe from rossi it turn better
sorry for my bad englisch i am from belgium
ORIGINAL: jaka
Hi!
Do you use:
9x6, 9x7 , 9x6,5 APC prop or a 8" - 8,75" APC pylonracing prop?
0-5% nitro?
Rossi 6 glow plug?
5-6oz Trettra "Bubbleless" tank?
...You should!
Hi!
Do you use:
9x6, 9x7 , 9x6,5 APC prop or a 8" - 8,75" APC pylonracing prop?
0-5% nitro?
Rossi 6 glow plug?
5-6oz Trettra "Bubbleless" tank?
...You should!
#7
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RE: engine problem
yes, had the same problem in my nelson powered Polecat- slight leak at the mouth of the bladder- replaced the bladder and no further troubles. regards trevor h[:-]
#12
Senior Member
RE: engine problem
Quote - "i think that i make the exhause on the sleeve to big"
Yes, I would agree, 1 mm would be just shy of .040" and that is a lot on an engine that already has pretty high port timings. You can put a degree wheel on it but I bet the exhaust timing is going to be greater than 185 deg. and that is high. May be time for a new sleeve/piston if it has been cut too far. [8D]
Good luck getting it figured out.
Yes, I would agree, 1 mm would be just shy of .040" and that is a lot on an engine that already has pretty high port timings. You can put a degree wheel on it but I bet the exhaust timing is going to be greater than 185 deg. and that is high. May be time for a new sleeve/piston if it has been cut too far. [8D]
Good luck getting it figured out.
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RE: engine problem
ORIGINAL: derosa1
i think that i make the exhause on the sleeve to big
i think that i make the exhause on the sleeve to big
And if you're trying to make a Nelson out of a Rossi that way, you're in for a disappointment. There's a lot more to performance than exhaust timing.
Have you actually measured what rpm you are turning? Exactly what Nelson muffler are you using? If your engine has a hard time reaching the muffler's tuned rpm range, you will get tuning problems like you have now. You will be turning in that needle to get it staged on the pipe, but since the engine can't get there, you're starving it to death. This may well be the case if you are using the Q500 muffler. If you are, you may get better result from the Nelson" "sport" muffler.
Bring your engine along to the field next weekend, so we can have a look at it. (unless you don't want us looking ) I'll bring my degree wheel along, so we can at least have a look at that exhaust timing.
I know, I know... a little late. The race was last week, but there's always next time.