11:5:1 comp ls.vtec
just under 1000 miles on it.. i notice that im getting quite a bit of oil in the catch can..
last night i filled the oil to full and this morning it was about 1/4 qt low

its not smoking out of the exhaust or anything just going into the catch can

i have the oem honda fittings on the back of the block and no return on it

 

You would probably be better off venting from the valve cover and vent/return from the back.But I don't think you should be making that much vapor NA.Either you have a lot of blowby or your running high oil temps.

 

ive read that oem fittings may create a vacuum and pull oil out of the motor?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Timmay &raquo;</TD></TR><TR><TD CLASS="quote">ive read that oem fittings may create a vacuum and pull oil out of the motor?</TD></TR></TABLE>

Some thing is wrong.

Two years ago i had the same problem. We were having a lot of blow by to the catch can. We had to top up min 0.5Liter oil every one hour non-stop race else we will get oil starvation and vtec won't open. Car was not smoking too.

We check everything and came to 2 conclusion.

1. Bad valve seal causing air leak and pressure to valve cover.

2. Too loose a cylinder bore causing higher pressure blow by through the valve seal.

I don't know if it made sense but this what we think.

The next engine build we run a tighter piston to wall clearance and 100% OEM Honda Valve seal and solve the problem.

 

well my ring gap is very tight and to oem spec

also i just had a valve job done.. car runs good and drives good


im thinking im gonna try some different block fittings like endyns see if that does anything

 

i have the endyne kit and i too am havin the sam prob with the same motor as the op wit about 1200 miles on the motor

 

I had the same problem, I gave up and ran the return... no problems since

 

I have used the fittings on the back of the block several times and I wound up giving up on it and just running valve cover vents.

 

are the valve cover vents enough to vent on a NA motor???

is the block vents really necessary???

 

If you weld on some -8 or -10 fittings on the cover its plenty enough for NA. There is a good spot on the front of the cover behind a baffle to use.

 

Currently I have my OEM valve cover hole open to atmosphere seems fine, never any oily residue around it so I would guess i do not have a blow-by problem. I am not sure why so many guys have problems with the cans filling and others do not.

 

well im not gonna put VC fittings on this cover i just bought it brand new

i may just end up doing a return on it or trying some different block fittings