Honda Myth: Tapping oil pan at bottom is bad.
02-17-2009, 01:50 AM
#33
1.5 BAR
Join Date: Oct 2006
Posts: 964
Re: Honda Myth: Tapping oil pan at bottom is bad.
i agree that having a return above the oil level in the pan would be ideal, but stevemode makes a great point. i personally think where everyone has the problem is with (as mentioned above) blowby. i'm willing to bet that with most returns that are above the oil level in the pan, the return never gets completely full. let me say that another way, anywhere along the length of the return line, there will be 'air' in the line and never a full cross section full of oil. therefore, positive crank case pressure would never keep oil from draining into the pan.
however, if the return was lower than the oil level in the pan, any positive pressure on the top side of the oil would potentially be fighting gravity for any oil in the return line. this would be due to the fact that if the return is lower than the oil level, it will always have oil 'blocking' off the line. as long as there is a good PCV setup, i don't see where this would be a big problem.
however, if the return was lower than the oil level in the pan, any positive pressure on the top side of the oil would potentially be fighting gravity for any oil in the return line. this would be due to the fact that if the return is lower than the oil level, it will always have oil 'blocking' off the line. as long as there is a good PCV setup, i don't see where this would be a big problem.
02-17-2009, 02:53 AM
#34
1.5 BAR
Join Date: Oct 2006
Posts: 1,147
Re: Honda Myth: Tapping oil pan at bottom is bad.
some one correct me if im wrong
lets say you have 60 psi oil pressure going to the turbo at WOT
oil goes through the bearing ect and come out to the drain
makes sense to me that some of that pressure (less) transfers in to the drain (to make thins simple say 1/6)
so there is 10 psi pushing the oil down through the return line at a decent speed (60 psi coming in and the volume has to go some where)
so if the return line isn't supper short and you got a decent catch can set up you should be fine
lets say you have 60 psi oil pressure going to the turbo at WOT
oil goes through the bearing ect and come out to the drain
makes sense to me that some of that pressure (less) transfers in to the drain (to make thins simple say 1/6)
so there is 10 psi pushing the oil down through the return line at a decent speed (60 psi coming in and the volume has to go some where)
so if the return line isn't supper short and you got a decent catch can set up you should be fine
02-17-2009, 02:56 AM
#35
1.5 BAR
Join Date: Oct 2006
Posts: 964
Re: Honda Myth: Tapping oil pan at bottom is bad.
Originally Posted by Atticus
some one correct me if im wrong
lets say you have 60 psi oil pressure going to the turbo at WOT
oil goes through the bearing ect and come out to the drain
makes sense to me that some of that pressure (less) transfers in to the drain (to make thins simple say 1/6)
so there is 10 psi pushing the oil down through the return line at a decent speed (60 psi coming in and the volume has to go some where)
lets say you have 60 psi oil pressure going to the turbo at WOT
oil goes through the bearing ect and come out to the drain
makes sense to me that some of that pressure (less) transfers in to the drain (to make thins simple say 1/6)
so there is 10 psi pushing the oil down through the return line at a decent speed (60 psi coming in and the volume has to go some where)
02-17-2009, 05:39 AM
#36
1.5 BAR
Join Date: Mar 2005
Posts: 723
Re: Honda Myth: Tapping oil pan at bottom is bad.
I'd try this with my EG, but the current 16 inches of mostly vertical 5/8" drain line would fudge any problems that may pop up 
I'd just get a ------- scavenge pump and do it that way. At least you'd never have issues, and can always sell the oil pan easily if you blow your ---- up.
My EF kit with the HF-A/C adapter I made put the drain line very low, maybe right at the oil level. There is all of 1" from CHRA flange to top of oil pan, and to make things worse, the 3" DP below. It comes out the driver's side, whitey bends around, then crosses over under the drain line. With 2 different old turbos on it, it never smoked unless I relined it in neutral (once).
I think the reason the Greddy drain works is because you'll almost never find an '06 Honda motor with as much blowby as a 230,000 mile B18A1 in a 1990 Teg, for instance. My beater's D15 has enough blowby at idle to power a small windmill.
I'd just get a ------- scavenge pump and do it that way. At least you'd never have issues, and can always sell the oil pan easily if you blow your ---- up.My EF kit with the HF-A/C adapter I made put the drain line very low, maybe right at the oil level. There is all of 1" from CHRA flange to top of oil pan, and to make things worse, the 3" DP below. It comes out the driver's side, whitey bends around, then crosses over under the drain line. With 2 different old turbos on it, it never smoked unless I relined it in neutral (once).
I think the reason the Greddy drain works is because you'll almost never find an '06 Honda motor with as much blowby as a 230,000 mile B18A1 in a 1990 Teg, for instance. My beater's D15 has enough blowby at idle to power a small windmill.
02-17-2009, 06:48 PM
#39
3.0 BAR
Join Date: Mar 2006
Posts: 5,631
Re: Honda Myth: Tapping oil pan at bottom is bad.
---- nig... Your turbo hangs lower tghan my sack.
Ya it makes total sense... The oils going to find its own level anyways...
Mines at the top of the pan, return ins solid line, with a bung that has a -10 to 5/8 barb... SLight downhill to it. Im not worried.
I concur with stealthnigs findings and approve this message
Ya it makes total sense... The oils going to find its own level anyways...
Mines at the top of the pan, return ins solid line, with a bung that has a -10 to 5/8 barb... SLight downhill to it. Im not worried.
I concur with stealthnigs findings and approve this message
