Valve float

[REDNECK GOCARTS]

So I was outside seeing how fast my kart goes and it currently has the governor bypassed, I should go in there and remove it but anyways, I was going along and the engine RPM was really high and then all of the sudden it was starting to make a different noise. I don't know how to explain it cause every thing was happening so fast but could it have been valve float? Thanks.

 

[Whitetrashrocker]

Crunching? Rattling?

Any kind of adjectives work.

Did it lose all power, some power?
Did it still run or did it throw a rod?

What's a different noise? Did it start to bleet like a sheep?

 

[mckutzy]

Hehehahahaha...
Ya sounding like bleeting sheep... Something is defiantly up...

 

[itsid]

I was walking through the woods the other day.. there was this strange bird I never have seen before..
I wonder if you can tell me what it was?

Anyone??

'sid

PS [/sarcasm]

 

[REDNECK GOCARTS]

It didn't loose power at all and no I did not throw a rod. It was working fine after words. All I want to know is their a difference in sound when the valves are floating?

 

[Bbqjoe]

Did it sound like a salt marsh harvest mouse, or more like a wild anaconda?

 

[anickode]

Did it sound like a roll of firecrackers going off in a parking garage?

Probably just the turbo anti-lag system kicking in.

---------- Post added at 10:00 PM ---------- Previous post was at 09:53 PM ----------

Yes, valve float can make it sound different.

So can an overly lean combustion, which could possibly result from spinning an engine at 5000 rpm without jetting the carburetor.

Or it could be trying to stuff too much exhaust through a crappy stock muffler, or suck too much air through a stock air box that doesn't breathe, or both.

Or you could have a loose bit somewhere that resonates at 83hz and adds a funny sound when the engine hits 5000rpm.

Or there could be a squirrel stuck next to the flywheel.

Without hearing it, it's kind of hard to diagnose.

But yes, it could possibly be the result of the valves starting to float.

 

[REDNECK GOCARTS]

It has a header and kind of a better air filter, It never had one to begin with. I think its just valve float. Thanks for telling me that it would make a different sound.

 

[Bbqjoe]

It has a header and kind of a better air filter, It never had one to begin with. I think its just valve float. Thanks for telling me that it would make a different sound.

The determining factor of valve float would be no more throttle or acceleration.

But if it sounds like a big wooden spoon banging on a large stainless steel popcorn bowl, none of this speculation would add up to a mound of dingo's kidneys.

Hey, rotaderps are on sale!!!!

 

[anickode]

It has a header and kind of a better air filter, It never had one to begin with. I think its just valve float. Thanks for telling me that it would make a different sound.

When the valves float, it's because the cam is spinning so fast the valves don't have time to snap shut before the cam is pushing them open again. That's why you need stiffer valve springs to combat it.

The result is that the 4 stroke cycle gets all out of whack. You've got blow backing up into the suck, you've got squeeze leaking out the blow, and everything all goes to **** because you're trying to bang, suck, and blow, all at the same time with no squeeze.

That's bound to make a noise.

Basically when the valves start to float, it's trying to run like a pulsejet engine, which doesn't work out too well. It is completely self regulating though... Valves start to float, engine stops accelerating

 

[bob58o]

because you're trying to bang, suck, and blow, all at the same time with no squeeze.

Gotta love the single life.

 

[Bbqjoe]

Gotta love the single life.

Brilliant!