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Post by captincvmn on Apr 4, 2021 15:10:44 GMT -5
With all the talk lately about exhaust tuning with length, diameter, taper rpm range, now I’m thinking about intake.
Because single cylinders tend to spit out the intake how beneficial would it be to have a tuned intake runner to maximize that one-way direction of air?
I wonder if it would be a waste of time to experiment with lengths and diameters and tapers of pipe on the exterior entrance end of a carburetor to produce an inertia of air going inwards. To combat the minute puff coming out during a normal cycle.
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df41590
Scoot Enthusiast
Posts: 285
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Post by df41590 on Apr 4, 2021 15:20:02 GMT -5
By no means a scoot master, but by my understanding you want the same iD intake as the ID of the intake side of the carb. With these having reeds I would think as soon as the piston starts going down and starts to build pressure in the crankcase the reeds close and prevent anything from going back through the intake.
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micky
Scoot Member
wrenching on something
Posts: 41
Location: Europe
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Post by micky on Apr 5, 2021 5:06:28 GMT -5
correct me if i am wrong, doesn´t a reed valve take care of this already? before the reed valve close you will always have some fuelmix fumes go backwards out the carb, but that ammount is so small that it is negligible.
/ Mike
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Post by captincvmn on Apr 5, 2021 5:26:36 GMT -5
correct me if i am wrong, doesn´t a reed valve take care of this already? before the reed valve close you will always have some fuelmix fumes go backwards out the carb, but that ammount is so small that it is negligible. / Mike It does but if you watch a high speed camera of the carb it mists outwards a surprising amount. I’d like to recapture that amount. |
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micky
Scoot Member
wrenching on something
Posts: 41
Location: Europe
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Post by micky on Apr 5, 2021 5:37:42 GMT -5
it doesn´t make a difference really, a good air filter will keep the fumes from escaping too much. but the difference is not noticable. good thinking tho  |
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Post by captincvmn on Apr 5, 2021 5:47:02 GMT -5
But everything makes a difference even if it is small
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Post by Lucass2T on Apr 8, 2021 15:35:35 GMT -5
A motor with a reed valve: as short as possible, no matter how big, small, powerful, weak, high or low revving of a motor you have.
A piston ported engine wants a long runner for low revving engines and a short one for high revving engines.
Unless you have a piston ported motor, i'd suggest not putting too much effort in it.
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