Modified Shark Vent
04-07-2013, 04:31 PM
#16
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Gary, thanks, curious to know what setup you wound up using.
Alan, thanks for your thoughts. I had the same concerns but couldn't find a better solution. Not sure I understand your first option as the cleaned air would also enter the crank case again through the first check valve. The second option, like you said the Provent has a blow off valve. It sure would make a mess when oil would come out of the top. After installing this setup I did a series of test runs, each time increasing the rpms. I figured I would find out empirically if the system could handle the pressure. At moderate to mid rpms there wasn't even a trace of oil in the Provent. Finally at 5000+ rpms there was evidence of oil passing through the system, the oil filter was darker from halfway down. No oil standing in the Provent. No traces of oil around the cap anywhere. I do check it regularly after driving but it seems it works until now.
Alan, thanks for your thoughts. I had the same concerns but couldn't find a better solution. Not sure I understand your first option as the cleaned air would also enter the crank case again through the first check valve. The second option, like you said the Provent has a blow off valve. It sure would make a mess when oil would come out of the top. After installing this setup I did a series of test runs, each time increasing the rpms. I figured I would find out empirically if the system could handle the pressure. At moderate to mid rpms there wasn't even a trace of oil in the Provent. Finally at 5000+ rpms there was evidence of oil passing through the system, the oil filter was darker from halfway down. No oil standing in the Provent. No traces of oil around the cap anywhere. I do check it regularly after driving but it seems it works until now.
04-07-2013, 05:17 PM
#17
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Aryan,
Well if you choose the right crack pressure for the extra check valve then it would only flow at all when the current breather size limitation starts creating some back pressure on the provent and at that point there must already be more pressure in the crank so that the in-only valve is already cclosed - so it can only flow into the pre TB port... it is concievable that there are occasional flows of cleaned air back into the crank during transition periods - but who cares anyway?
No steady state flow can exist that way because the only things driving crank evacuation flow are intake vacuum or blowby pressures
I had seriously consider plumbing mine exactly as I mentioned here (and mostly like you did) - but have ultimately decided to go a different route - however I still thinks its a good plan for a mostly stock set-up.
Instead I will now do something rather more complicated which has a major downside (- all the extra complications).
Alan
Well if you choose the right crack pressure for the extra check valve then it would only flow at all when the current breather size limitation starts creating some back pressure on the provent and at that point there must already be more pressure in the crank so that the in-only valve is already cclosed - so it can only flow into the pre TB port... it is concievable that there are occasional flows of cleaned air back into the crank during transition periods - but who cares anyway?
No steady state flow can exist that way because the only things driving crank evacuation flow are intake vacuum or blowby pressures
I had seriously consider plumbing mine exactly as I mentioned here (and mostly like you did) - but have ultimately decided to go a different route - however I still thinks its a good plan for a mostly stock set-up.
Instead I will now do something rather more complicated which has a major downside (- all the extra complications).
Alan
04-07-2013, 05:54 PM
#18
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Aryan,
Well if you choose the right crack pressure for the extra check valve then it would only flow at all when the current breather size limitation starts creating some back pressure on the provent and at that point there must already be more pressure in the crank so that the in-only valve is already cclosed - so it can only flow into the pre TB port... it is concievable that there are occasional flows of cleaned air back into the crank during transition periods - but who cares anyway?
No steady state flow can exist that way because the only things driving crank evacuation flow are intake vacuum or blowby pressures
Well if you choose the right crack pressure for the extra check valve then it would only flow at all when the current breather size limitation starts creating some back pressure on the provent and at that point there must already be more pressure in the crank so that the in-only valve is already cclosed - so it can only flow into the pre TB port... it is concievable that there are occasional flows of cleaned air back into the crank during transition periods - but who cares anyway?
No steady state flow can exist that way because the only things driving crank evacuation flow are intake vacuum or blowby pressures
Do tell!
04-07-2013, 08:37 PM
#19
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Aryan,
A vacuum pump system similar to what Colin (Lizard) has done - so somewhat more predictable evacuation. Some changes from what he has done but same general idea.
Alan
A vacuum pump system similar to what Colin (Lizard) has done - so somewhat more predictable evacuation. Some changes from what he has done but same general idea.
Alan
