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7/9/2014
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Edited Date/Time
3/18/2015 5:36am
I think it's time to reconsider forced induction on bikes to help combat the sound issues surrounding modern 4 strokes. They should lower displacement and allow turbos to be used. To keep it fair they could set a ceiling on how much boost was allowed. Turbos already lower sound level considerably and combined with lower displacement it only makes sense one day to explore it.
The Shop
Have you seen what happens to a turbo when it ingests dirt?
And why would you need for quieter engines for closed circuit comp bikes?
If you live near a sports stadium or race track you are going to h ear regular noise.
Oh well back to Redtube for some real forced induction.
The Man wasn't pumped when I told him since the KTMs don't need any help to pass sound.
-A naturally aspirated 450 already makes more power than most people can use even at the pro level.
-The cost of dirt bikes is already getting out of hand. A turbo will only increase costs and accelerate maintenance schedules.
If we need to conform to these idiots pushing "noise pollution" there are much better ways to do it.
2- As a previous poster mentioned, spooling up is a non- issue for smaller turbos. Especially if you were to go with a variable vane turbo which would also provide a very linear smooth power delivery.
3- Mechanical noise of the engine is not the biggest factor. Put your ear by my exhaust and I'll crack the throttle to help explain my point. The turbo would not be for dampening the intake pulse note, it would be used for dampening the exhaust pulse while also allowing a smaller displacement engine for the same output. Some engines get away with only using a turbo to lower exhaust sound level and don't even require a muffler.
4- Once again this is not for higher output as if the 450's don't have enough already. Cut the displacement down to say 150 or 200 and boost up to maintain same power output as current 450's.
We aren't talking about 80's technology here guys. A supercharger would be pointless as it does nothing to lower the exhaust note.
Pit Row
Its not as simple as slapping a turbo under the seat. It would also require induction piping, larger/longer exhaust system, an intercooler, and a type of over boost pressure release device. Weather it be mechanical or electronic.
A supercharger would be just as bad. Adding inches to the overall dimensions of the engine, no matter how you packaged it.
Since a turbo isn't necessary for power on a modern day dirt bike, the sole reason for this would be to decrease the noise output? There are other ways to do that which are simpler and more cost effective, right?
I will admit that I don't know much about forced induction but I have driven forced induction cars and naturally aspirated cars both on the road and on the track. I greatly prefer the characteristics of a naturally aspirated motor. Again my knowledge isn't much on the matter but I believe the big push to forced induction in cars is for better fuel economy relative to power output which is an advantage in many forms of auto racing along with it being necessary to develop the technology for the consumer market to meet increasingly strict fuel economy requirements.
One of the great appeals of a motorcycle to the average Joe is how simple of a machine it is. I think that is something that should be kept in mind when going forward in development, especially in the realm of dirt bikes.
these damn things have ruined motocross at the grass roots level already do to cost and you want to put forced induction on them... really?????
Exactly how many pots did you smoke today?
731 I completely agree reducing sound levels isn't the real issue because there are ways to do it. The problem is doing it without sacrificing power, or making the average Joe think the bike is slower simply because it's not as noisy. How are you going to sell people on reduced performance for a quieter bike? No one would buy that.
Sound pollution is a big issue for lots of tracks, especially for private riding areas that don't have special zoning.
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