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Hayden Krank Vent

posplayr said:
More reading on Krank Vent

http://www.et-performance.com/faq.html

http://www.jpcycles.com/instructions/pdf/432-271.pdf

http://www.google.com/patents/US5967178

See the description in the patent, it is a type of one way check valve that works best for 1 and 2 cylinder motors. Where the rise and fall of the pistons would create a pressure imbalance in the crankcase.

There should be minimal effect on an GS Inline 4
Click to expand...
Your second link says a lot of the same things I wrote earlier. It also says it can show 4 to 7 psi vacuum, which is believable. One thing that bothered me in that dragpost.com link I posted is that the guy was claiming 15 psi, which is a problem given that atmospheric pressure is only 14.7 psi at sea level and that's the highest differential pressure you could achieve on planet earth. Perhaps this thing works better on Jupiter...
 
Crankcase vent.

Crankcase vent.

I've used the Spike crankvent on a 93 Sportster and on that engine, there was a noticeable difference.
 
AJ said:
Your second link says a lot of the same things I wrote earlier. It also says it can show 4 to 7 psi vacuum, which is believable. One thing that bothered me in that dragpost.com link I posted is that the guy was claiming 15 psi, which is a problem given that atmospheric pressure is only 14.7 psi at sea level and that's the highest differential pressure you could achieve on planet earth. Perhaps this thing works better on Jupiter...
Click to expand...

Yes sorry, I quoted the part about 1/2 cylinders in reference to your comments. I still don't understand where this is going to help a GS? Will it at least create enough vacuum on a inline 4 to suck in oil leaks?
 
posplayr said:
Yes sorry, I quoted the part about 1/2 cylinders in reference to your comments. I still don't understand where this is going to help a GS? Will it at least create enough vacuum on a inline 4 to suck in oil leaks?
Click to expand...

are we then talking the potential to starve certain places of oil? if it can "suck in" oil leaks, it could suck oil from delicate places, such as cam journals, or outer gearbox bearings? :eek:
 
Agemax said:
are we then talking the potential to starve certain places of oil? if it can "suck in" oil leaks, it could suck oil from delicate places, such as cam journals, or outer gearbox bearings? :eek:
Click to expand...

I'm just referring to what I thought I read about the benefits. If there was a small vacuum in the crank case it stands to reason that any standing oil that tried to weep out a gasket would be pushed back into the crankcase by atmospheric pressure. Any high pressure oil would easily over come the vacuum and squirt where it wanted to go
 
the more i read about this the more i am believing it. although, from what i have read so far it is only effective and worthwhile in very large CI engines with short running periods. IE drag cars.

the use on small CI engines for street use, cars or bikes, the cons seem to outweigh the pro's.
 
Agemax said:
the more i read about this the more i am believing it. although, from what i have read so far it is only effective and worthwhile in very large CI engines with short running periods. IE drag cars.

the use on small CI engines for street use, cars or bikes, the cons seem to outweigh the pro's.
Click to expand...
It only works when there is a variable crack case volume. An inline 4 does not (appreciably) vary the crank case volume during reciprocation of the pistons. 1-4 cancels out 2-3

The only crank case pressure is from blow by.
 
Agemax said:
well the big V8 boys have obviously improved his patent and got it to work well on V8's.....................;)
Click to expand...
These things are popular with the Harley crowd. Would probably help a Triumph twin as well.
 
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If vacuum pumps DIDN'T work, we would not use them on dragbike engines. On a good 1500+cc GS they are good for 5-10 hp. The gains are even bigger than JUST using the pump because you can use lower tension rings for less drag & more power & still have ring seal due to the vacuum drawn in the engine. I know they work on drag engines but have no idea about other applications. Ray.
 
rapidray said:
If vacuum pumps DIDN'T work, we would not use them on dragbike engines. On a good 1500+cc GS they are good for 5-10 hp. The gains are even bigger than JUST using the pump because you can use lower tension rings for less drag & more power & still have ring seal due to the vacuum drawn in the engine. I know they work on drag engines but have no idea about other applications. Ray.
Click to expand...
I believe it!

Agemax said:
are we then talking the potential to starve certain places of oil? if it can "suck in" oil leaks, it could suck oil from delicate places, such as cam journals, or outer gearbox bearings? :eek:
Click to expand...
The good news is that a simple check valve, no matter how expensive, doesn't seem to work well enough to cause a problem!

Of course you could just save your money and buy some stout.
 
i am thinking now about finding a suitable non return valve to incorporate into my crankcase breather tanks. instead of a vent on top the tank, fit a one way valve.
would this have a similar effect as the vacuum valve with the added catch tank to collect any fluids that get sucked out?
 
The problem is finding one that will work reliably at the RPM's your bike will be running. My Briggs and Stratton V-Twin on my 0-Turn lawnmower has a one way reed valve to vent the crank case (this theory is certainly not new). It appears that reliability at higher RPM's is the issue. Maybe ET has solved this with their KrankVent. The one for most motorcycles is about $75.00. I just put a new umbrella valve in my Hayden and I could instantly tell the bike was running nicer. I'm guessing the Hayden valve would would work really well on the lawnmower.:)
 
rapidray said:
If vacuum pumps DIDN'T work, we would not use them on dragbike engines. On a good 1500+cc GS they are good for 5-10 hp. The gains are even bigger than JUST using the pump because you can use lower tension rings for less drag & more power & still have ring seal due to the vacuum drawn in the engine. I know they work on drag engines but have no idea about other applications. Ray.
Click to expand...

do you run a vacuum pump Ray on any of your bikes? if so do you run one of these kits or make your own set up?
 
rapidray said:
If vacuum pumps DIDN'T work, we would not use them on dragbike engines. On a good 1500+cc GS they are good for 5-10 hp. The gains are even bigger than JUST using the pump because you can use lower tension rings for less drag & more power & still have ring seal due to the vacuum drawn in the engine. I know they work on drag engines but have no idea about other applications. Ray.
Click to expand...

I can believe the power gains. But a simple reed valve or PCV valve doesn't make any real difference on an inline four. As someone said here this simple system only works well on something with widely varying crankcase volume - a single, 360deg twin,Flat twin, V twin etc...To see gains on an inline four something like a vacuum pump is needed.
I've been using Yamaha 4 petal reed valves for years on singles and twins with very good results - even solved the Brittens crankcase breathing probs with one...
 
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