Quote:
Originally posted by NBs996
Well ok ruth, so as not to dissappoint you further, i've put my career on the line and scived off work for 15 mins to complete my answer. What was the question again?? Oh, I remember...
"Why do 996 bips seem to develop a stumble/missfire,when getting back on the gas after they have been cruising on low revs /high gears for a while?"
The scientific answer:
Since I work in the petrochemical engineering design and consultancy business, this isn't too difficult a question, but let's try to explain it in layman's terms...
This problem(?) is such a finely balanced chemical reaction that it only tends to affect the more highly tuned engines which demand nothing short of perfection. So and if your bike is doing it then you've good reason to be proud of your stead!
It's actually not "missing a beat" initially, it's to do with the phenomenon of the suns rays drawing streams of heavy-metal gasses as they pass through the atmosphere of the planet Mercury (have you noticed it doesn't happen at night?).
This metallic rich air, if drawn into the cylinders in large enough quantities (like when opening the throttle quickly), causes a heavier air content in a single combustion which changes the atomic structure of the metalic atoms and acts like a magnet to oxygen drawing most, if not all, of the oxygen from the airbox in one go. When the airbox "recharges" with fresh air then all is fine again and the combustion cylces can return to their rythm of the steady cruise.
Now here's the twist...
It's probably more likely to happen with mav's bike because of the lack of salt in the air where he lives in the midlands; since the salty sea air on the coast, when mixing with the metallic gasses, actually forms a chemical imbalance at several different temperature ranges of the inlet tracts preventing too much oxygen being affected by this magnetic pull - it works in a similar sort of way to reversing the poles on a magnet.
Geographic location obviously depends on the wind direction, but living on the south coast means it happens with my bike very rarely due to the common south-westerly winds bringing in the sea air.
nb
[Edited on 1-2-2005 by NBs996] |
You left out the bit about standing on one leg!
Actually, my 996 bip had the stutter as well and it is down to the twin injectors. Neil Spalding, as part of his 996 bip racer "Grunter" spec does the single injector mod with the FIM chip. I had Neil's full monty done and the grunter spec at the same time and my bike is fine now.
In fact, it's more than fine. I would suggest it goes harder than most 996's without headwork etc. Check out what Neil does in the Grunter
here
01-Feb-2005, 11:27 
Hybrid Mode
