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PCV gases and K and N pod filters

  • Thread starter Thread starter surviverguy
  • Start date Start date
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surviverguy

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I'm planning on using two pod filters on my 1980 GS450 mounted directly to the carbs. What to do with the pcv gases? Option 1)Vent to atmousphere. Option 2) route pcv to can mounted above valve cover and connect the can to the pods. Anybody tried to reburn pcv gases using pods for better enviroment and better fuel economy? Any problems with reburning the gases when using pods?
 
I have sent this same question to technicians at K and N. I'm waiting for their responce. I'm sure they would know. Right?:D
 
You're trying to do the right thing by capturing the blowby, but changing to pods make it difficult. I'd tune up my cars and drive less to counter the little extra pollution the 450 is spewing.
 
Sheep farting is more an environmental hazard than your 450 with an opened crank case vent. Design a re-breather for that and you might actually affect the numbers in a positive way. Keep the bike tuned well and replace the rings and worn parts when necessary and you will have done your part, or design a completely clean fuel, but if you do, get a way faster bike.
 
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I found an interesting article on the PCV debate. I'll try to post the link soon. In a nutshell- the blowby does more harm to the engine than good. It can be argued that the environmental impact is insignificant. Returning the gases through the pods also increases fire hazards. The blowzy gases will also add carbon to the carburetors which could affect it's operation in a negative way- think stuck slides and lean burning.
The water condensation and acids will shorten engine life and performance and increase maintenance. This is just something I wanted to think through and understand BEFORE jetting the carbs.
The PCV "expert" created some BUNN crankcase ventilation and makes a convincing sales pitch. The BUNN system is supposed to not just vent the gases to atmosphere, but continuously purges the crankcase moving fresh air through it....
 
I Have a Hayden Krank Vent Plus on my bike. In addition to purging the crankcase, it maintains a three to five lb. vacuum in the crank case. It has positive results in low end power and smoothness, has increased high speed gas mileage, and brings it back to very nice low speed silky performance. This is on a bike with pipes pods and a stage three jet kit. My daily MPG average rolling at commute speeds with traffic has gone from 36.5 to 41.5. The average minivan driver in our area thinks the speed limit is 70+.
 
OldVet66 said:
I Have a Hayden Krank Vent Plus on my bike. In addition to purging the crankcase, it maintains a three to five lb. vacuum in the crank case. It has positive results in low end power and smoothness, has increased high speed gas mileage, and brings it back to very nice low speed silky performance. This is on a bike with pipes pods and a stage three jet kit. My daily MPG average rolling at commute speeds with traffic has gone from 36.5 to 41.5. The average minivan driver in our area thinks the speed limit is 70+.
Click to expand...

Isn't that just a version of the old PCV valve we had on cars at the beginning of pollution control?
 
I have a small K&N filter on my vent tube. it was that way when I bought it. Couldn't tell you if it has any benifits or not. It just works...
 
tom203 said:
You're trying to do the right thing by capturing the blowby, but changing to pods make it difficult. I'd tune up my cars and drive less to counter the little extra pollution the 450 is spewing.
Click to expand...
If I do start getting a guilty feeling- I'll pedal my bicycle, plant a couple trees and sell the car- But the blowby on my GS is heading to atmousphere! (LOL)
 
OldVet66 said:
I Have a Hayden Krank Vent Plus on my bike. In addition to purging the crankcase, it maintains a three to five lb. vacuum in the crank case. It has positive results in low end power and smoothness, has increased high speed gas mileage, and brings it back to very nice low speed silky performance. This is on a bike with pipes pods and a stage three jet kit. My daily MPG average rolling at commute speeds with traffic has gone from 36.5 to 41.5. The average minivan driver in our area thinks the speed limit is 70+.
Click to expand...
That's something I am interested in (Hayden Krank Vent Plus or similar idea/ product. How much did that kit cost? Does it require maintenance or ongoing expense of replacing parts...?
 
Spyder said:
I have a small K&N filter on my vent tube. it was that way when I bought it. Couldn't tell you if it has any benifits or not. It just works...
Click to expand...
Where is the vent tube filter located? Does it drip oil all over your bike?
 
surviverguy said:
If I do start getting a guilty feeling- I'll pedal my bicycle, plant a couple trees and sell the car- But the blowby on my GS is heading to atmousphere! (LOL)
Click to expand...
If Al Gore doesn't worry about all the pollution his plane creates flying around telling everyone about pollution, you should feel no guilt.
 
I just run a piece of fuel line from the vent to the back of the bike so whatever bit of oily smoke there is gets vented away from the bike and the rear tire.
 
surviverguy said:
That's something I am interested in (Hayden Krank Vent Plus or similar idea/ product. How much did that kit cost? Does it require maintenance or ongoing expense of replacing parts...?
Click to expand...

Hayden Krank Vent is $100+ on Amazon. :eek:

I'd like to do something other than vent it, but that would make for an expensive experiment to see if it actually helped performance on my bike.
 
I read on Harley forum about using a cheap ($10) brake booster check valve...users have said it works good and much cheaper than the "kits"...I can't comment on effectiveness as this is all new to me....
 
I've got a couple "junkers" out back...might just pull me a booster check valve and try it!
 
In cars the recirculation function ranges from a simple tube from crankcase to air intake, to more elaborate setups that involve some version of a catch can, where the idea is that those vapors will condense and the nasty stuff doesn't have to go back into the fuel/air mixture. Have you ever seen what collects in a catch can from crankcase vapors? It's milky beige goop, basically oil fumes. I wouldn't want to be trying to make my plugs burns that, and I definitely don't want it in my carbs. I had a VW Golf once and as an experiment I fashioned a catch can out of a salad dressing bottle. I got sick of cleaning oily residue out of the air intake tube. It didn't take very long for quite a bit of beige goop to collect. I wound up leaving it installed. On my 1150 I notice that there's a little bit of oily residue around the carb area where the vent tube hangs down but if I get a longer piece it will be fine.
 
A few Harley tuners have tried the Krank Vent on dynos. Harley is their target market but Harleys already have a valve that serves the same function. The tuners couldn't find any hp in these vents because of that and there probably just isn't any to be found.
 
As built, with an OE air filter housing, didn't the fumes just get sucked back into the engine anyway?

The hose from the vent on my bike was kinda short and just hung down near #3 pod. Guess which plug kept oil-fouling? Hose is longer now, with a small filter on the end.
 
surviverguy said:
If I do start getting a guilty feeling- I'll pedal my bicycle, plant a couple trees and sell the car- But the blowby on my GS is heading to atmousphere! (LOL)
Click to expand...

It's just exhaust that took a slight detour around the exhaust pipe, and with a tiny amount of oil in it. The same mix of CO, hydrocarbons and whatever else comes out the tail pipe. It's the same stuff. The only difference is it leaked past the rings instead of passing down the exhaust pipe.
It all goes to the atmosphere just the same.
Catch the oil somehow and you are running as clean as anyone else.
 
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