Sending oil and fumes back into our plenums? Why?
Discussion
Should we really be sending oil and fumes back into our plenums via the breather/flame trap?
Wouldn’t we be better off using something like this?
http://www.rimmerbros.co.uk/Item--i-GRID008915
Recently, I have spent a considerable amount of time working on my 14 CUX map in search of the perfect setup/AFR. I can only assume the breather hose fumes throw AFR results and contaminates the inside of the plenum with oil creating air flow friction and a sticky mess...
Thoughts?
MPO
Wouldn’t we be better off using something like this?
http://www.rimmerbros.co.uk/Item--i-GRID008915
Recently, I have spent a considerable amount of time working on my 14 CUX map in search of the perfect setup/AFR. I can only assume the breather hose fumes throw AFR results and contaminates the inside of the plenum with oil creating air flow friction and a sticky mess...
Thoughts?
MPO
This is nothing new and is the same on almost any engine. So hardly a major crisis or one off issue.
Options are:
- leave as is, and in reality millions of cars run like this no bother at all and have done for decades.
- fit a catch can to extract the oil and retain the feed back to the intake.
- fit a catch can to extract the oil and vent to atmosphere and block hole in the intake for it.
I run the middle option on my Rover V8. Catch cans are pretty cheap and easy to install.
Options are:
- leave as is, and in reality millions of cars run like this no bother at all and have done for decades.
- fit a catch can to extract the oil and retain the feed back to the intake.
- fit a catch can to extract the oil and vent to atmosphere and block hole in the intake for it.
I run the middle option on my Rover V8. Catch cans are pretty cheap and easy to install.
If not just sump oil- you can get exhaust mixture thrown back into the plenum chamber at low speed during the valve overlap period when gas velocity's are low called reversion. This is made worse on engines that have a long cam duration (read TVR) where gas velocities and torque are reduced at low RPM, to make bigger torque gains at higher RPM, and therefore ultimate power.
300bhp/ton said:
This is nothing new and is the same on almost any engine. So hardly a major crisis or one off issue.
Options are:
- leave as is, and in reality millions of cars run like this no bother at all and have done for decades.
- fit a catch can to extract the oil and retain the feed back to the intake.
- fit a catch can to extract the oil and vent to atmosphere and block hole in the intake for it.
I run the middle option on my Rover V8. Catch cans are pretty cheap and easy to install.
Interesting..., i'm gona give option 3 ago and run some back to back tests logging my AFR... Lets hope we have a few more weekends before the Weather puts a stop to everything!Options are:
- leave as is, and in reality millions of cars run like this no bother at all and have done for decades.
- fit a catch can to extract the oil and retain the feed back to the intake.
- fit a catch can to extract the oil and vent to atmosphere and block hole in the intake for it.
I run the middle option on my Rover V8. Catch cans are pretty cheap and easy to install.
blitzracing said:
If not just sump oil- you can get exhaust mixture thrown back into the plenum chamber at low speed during the valve overlap period when gas velocity's are low called reversion. This is made worse on engines that have a long cam duration (read TVR) where gas velocities and torque are reduced at low RPM, to make bigger torque gains at higher RPM, and therefore ultimate power.
Hi BlitzGood point, didn't think of that one but wouldn't this be related to CAMS that have an overlap?
Do all TVR V8 stock cams have overlaps?
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