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Wooshing sound from carb


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#1 BrokenTractor OFFLINE  

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Posted June 29, 2017 - 07:56 AM

Hello,

 

I currently have the air cleaner off of the carb. So when the flywheel is turned CW by hand you will hear a whoosing sound of air, followed shortly thereafter by another wooshing sound of air. The question I have is where is the piston head when the first woosh occurs?

 

I am aware of the 4 stroke stages of I, C, P, E maybe it is one of these? Or leaving one of these?

 

 

Thanks,

BrokenTractor



#2 jimmy G ONLINE  

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Posted June 29, 2017 - 08:00 AM

Check compression,intake valve I'm thinking

Edited by jimmy G, June 29, 2017 - 08:02 AM.


#3 BrokenTractor OFFLINE  

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Posted June 29, 2017 - 08:22 AM

I see I thought it was air exiting the Carb going "backwards" but it is air being sucked into the carb?



#4 dtsh ONLINE  

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Posted June 29, 2017 - 08:39 AM

I see I thought it was air exiting the Carb going "backwards" but it is air being sucked into the carb?

 

Could be either, if the valve isn't seating fully. Checking compression as suggested will rule that out.

If you're curious, you could pull the plug and mark where TDC is on the flywheel, then deduct if it's sucking or blowing by where in the stroke it is when you hear it.


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#5 BrokenTractor OFFLINE  

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Posted June 29, 2017 - 08:53 AM

Dtsh Thank-you.

 

Will try that. 

 

BrokenTractor



#6 secondtry OFFLINE  

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Posted June 29, 2017 - 09:58 AM

I see no mention of what engine you are working on, what the engine is on, how many cylinders, does it have automatic compression release, Most four cycle single cylinder engines are at top dead center when the fly wheel magnets are next to the mag coil but we don't know if it has a mag. Don



#7 glgrumpy ONLINE  

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Posted June 29, 2017 - 01:26 PM

Just sounds to me like Good suction with good rings. Would think could be either in or out depending on where it happens. Is this thing running or problems?



#8 tater195 ONLINE  

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Posted June 29, 2017 - 02:09 PM

sounds normal to me for being turned by hand. As for the question "where is the piston head when this is happening?"... TDC and going down unless you have a failed intake valve.



#9 JBRamsey ONLINE  

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Posted June 29, 2017 - 10:36 PM

Does the engine run correctly?

#10 JBRamsey ONLINE  

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Posted June 29, 2017 - 10:38 PM

One woosh is sucking air in. The second woosh is pushing it out the exhaust. Put your hand over the carb. You will feel it. Same with the exhaust.

Now back to my first question: does the engine run correctly?




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