Oil catch can?
Discussion
Has anyone got any pics or advice on fitting an oil catch can?
Despite being very fresh and healthy I believe my engine is consuming oil by ingesting it through the flame trap and back into the plenum.
This is obviously made a lot worse when using nitrous oxide and cylinder pressures are greatly increased upping the crancase pressure.
So i am thinking of fitting an oil catchcan and blocking the inlet at the plenum.
Thoughts on plumbing and options please.
Despite being very fresh and healthy I believe my engine is consuming oil by ingesting it through the flame trap and back into the plenum.
This is obviously made a lot worse when using nitrous oxide and cylinder pressures are greatly increased upping the crancase pressure.
So i am thinking of fitting an oil catchcan and blocking the inlet at the plenum.
Thoughts on plumbing and options please.
I have a really hi tech solution in the Taz racer. I used a 2L plastic turps bottle tie wrapped to the inner wing, stuck the breather pipe through a hole in the top and put a couple of vent holes in the top 
It's lighter than an ali one too 
One of the other racers uses a Volvic bottle but he's from down south and a bit posh.
It's lighter than an ali one too One of the other racers uses a Volvic bottle but he's from down south and a bit posh.
dbv8 said:
Thanks Dave 
.
I know you are serious.
I am going to measure up and get one made up at the local engineering shop. A pair of 19mm hoses from each rocker cover to a litre tank with a breather and a bleed tap for regular draining should do the job.
You need a sight glass on the side too Derek. Another reason I used a turps bottle is because its opaque .I know you are serious.
I am going to measure up and get one made up at the local engineering shop. A pair of 19mm hoses from each rocker cover to a litre tank with a breather and a bleed tap for regular draining should do the job.
I cross linked the rocker covers and just ran one pipe to the catch tank for neatness, but your way is good too.
NTEL said:
You need a sight glass on the side too Derek. Another reason I used a turps bottle is because its opaque
I cross linked the rocker covers and just ran one pipe to the catch tank for neatness, but your way is good too.
I was thingink of a clear hose linked top and bottom of the oil aerea IYSWIM.I cross linked the rocker covers and just ran one pipe to the catch tank for neatness, but your way is good too.
Yes to keep an eye on the level and drain off when needed.
I might have to polish it all up too. I wouldnt want it to look out of place in my engine bay.
Alexdaredevilz said:
Cant see anything with big enough fittings and a filter there Alex.they are pretty though
NTEL said:
I have a really hi tech solution in the Taz racer. I used a 2L plastic turps bottle tie wrapped to the inner wing, stuck the breather pipe through a hole in the top and put a couple of vent holes in the top It's lighter than an ali one too
One of the other racers uses a Volvic bottle but he's from down south and a bit posh.
Dave, don't you need 3l capacity for the catch er...bottle? It's lighter than an ali one too One of the other racers uses a Volvic bottle but he's from down south and a bit posh.
Regards
Iain
Derek you need to address the real issue of crankcase pressurisation by the sound of it. Oil catch can will prevent oil reaching plenum if vented to atmosphere but wont solve the base engine problem thats building. I think I'm right in saying that NOS may thin the oil and cause bore wash with combustion escaping past rings to block if the correct oil is not specified. Suggest you check best oil spec for NOS if you havnt already done so.
For forced induction (NOS being an alternative) you must use a suitable oil developed for that purpose to maintain an oil film at the top of the liners at higher combustion pressures and temperatures, although theoretically NOS acts as a fuel coolant.
We recommend Millers 15W/60 for these applications, but you can use oil of your choice as long as its suitable. If using conventional oil this may be causing the problem and its worth changing the oil to see if this resolves the problem.
If already using a suitable oil, you may have a leaking head gasket.
For forced induction (NOS being an alternative) you must use a suitable oil developed for that purpose to maintain an oil film at the top of the liners at higher combustion pressures and temperatures, although theoretically NOS acts as a fuel coolant.
We recommend Millers 15W/60 for these applications, but you can use oil of your choice as long as its suitable. If using conventional oil this may be causing the problem and its worth changing the oil to see if this resolves the problem.
If already using a suitable oil, you may have a leaking head gasket.
I am using a 'normal' 20/50 mineral at the moment.
Pressure is very good hot and cold but i am consuming more oil in this engine with fresh bearings etc, than i ever did on my old high mileage one.
It could be something to do with me using my polished SD1 covers maybe?
Where can i pick up the Millers oil? Somewhere near Portsmouth, Barrow or en-route preferred.
Pressure is very good hot and cold but i am consuming more oil in this engine with fresh bearings etc, than i ever did on my old high mileage one.
It could be something to do with me using my polished SD1 covers maybe?
Where can i pick up the Millers oil? Somewhere near Portsmouth, Barrow or en-route preferred.
NTEL said:
Chassis 33 said:
Dave, don't you need 3l capacity for the catch er...bottle?
Regards
Iain
Something like that according to the blue book, but I've never been pulled on it. In fact I don't ever recall any race car that I've seen having a catch tank anywhere near 3L capacity.Regards
Iain
Regards
Iain
dbv8 said:
It could be something to do with me using my polished SD1 covers maybe?
If they don't have the little 'mushroom' bleed port on the rear of the nearside, and the rest of the system is stock, it will suck fumes/mist like billy-o... If you arrive at a good solution, post up the result as mine breathes heavily at high rpm (6k+)
Pupp said:
If they don't have the little 'mushroom' bleed port on the rear of the nearside, and the rest of the system is stock, it will suck fumes/mist like billy-o...
If you arrive at a good solution, post up the result as mine breathes heavily at high rpm (6k+)
None of those mushroom jobbies but i think the nearside cover has a pipe with a hose attached and this may be left open. I will close this off.If you arrive at a good solution, post up the result as mine breathes heavily at high rpm (6k+)
CHGRIFF said:
Give Millers a go, it is a very good oil for the RV8 being developed for competition engines. Use 15W/60 as mentioned, this is what we specify for Supercharged engines. Suggest you buy 10 Litres from Internet.
Ive seen it about £50 for 5 litres. A small price to pay i guess Gassing Station | General TVR Stuff & Gossip | Top of Page | What's New | My Stuff