is there inlet silencer and PCV valve in bikes???

[oilsand]

I don't know whether there is any inlet silencer in any bike...

And if there is, could you show me the drawing of that, please... and the working principle...

and one more question...

Do you have pcv(pressure control valve) in your bike??


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[stinkwheel]

On the air inlet there is an airbox with a filter in it. This does supress the induction roar a good bit. The airbox is just a plastic box though, the filter is usually a re-useable oiled-foam type but sometimes a paper element. You can get ceramic element high-flow ones too as aftermarket tuning parts. Carb connects directly to the airbox with a rubber collar. The airbox is pressurised on some bikes by means of airscoops mounted in the front fairing.

I'm afraid I don't know what you mean by a pressure control valve. Do you mean the emergency valve that bypasses the filter circuit if oil pressure gets too low? Some bikes have an exhaust valve (solenoid controlled, either a butterfly in the header or a rotating collar in the exhaust manifold such as EXUP, YPVS or KIPS systems) to vary the diameter of the exhaust outflow.
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[oilsand]

thank you for your kind reply...


and

there is the PCV valve in some cars in the crankcase.

It's used to reuse the unpressed air fuel mixture.

when a piston goes up to the TDC, some air/fuel mixture leak from the gap between piston ring and cylinder because of the high pressure.

So, engineers use the PCV valve to reuse the air/fuel mixture.

The PCV valve connects crankcast to intake manifold...



And I wonder whether normally bikes use PCV or not....



Thank you for your kind reply... and sorry for my humble English...
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thank you for reading and your kind reply

[Kickstart]

Hi

Think the meaning of PCV I have heard is "positive crankcase ventilation". Not really to reuse gases from the crankcases, more just to vent them into the inlets to burn them off.

Most bikes just vent the crankcases to the airbox with a pipe.

All the best

Keith
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[mchaggis]

In the Clymer manual I have, it talks about the PCV as a 'purge control valve'. Fuel vapour from the tank is captured in a charcoal canister and then the PCV regulates its flow back to the carburettors for it to get burnt. That is only on the California models that I can tell, I haven't noticed it on mine, though I haven't really checked.

Burning crankcase blowby as a pollution control measure it's a fairly simple and effective one, just so long as you don't overfill with oil and end up filling your airbox with it (which admittedly might also take a blocked crankcase breather). I should think that in some instances the flow of whatever vapour there is in the crankcase would be controlled by a valve. I haven't heard it called a pressure control valve before, but it is basically just semantics.
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