The Peerless & Warwick Discussion Forum

Date: Feb 11, 2012

Crankcase Breather

Date: Feb 11, 2012

In my case the lower breather pipe is just blanked off with a core plug. Any crankcase pressure (and associated oil mist) is vented through the rocker cover and into a catch tank.
And yes, I do have the uprated rear crank seal to stop it venting all over the clutch.

See Moss diagram TR3 Engine external, item 40

40

132924

PLUG (in place of breather pipe)

Note:

closed circuit breathing

TR2, TR3/3A, TR4/4A

£1.90
2.26

1

FF

Date: Feb 11, 2012

don't want to sound stupid here but....why do you want to catch it?

surly its your god given right to distribute said breather pipe contents for all the world to enjoy

I have a plastic flexy pipe that just takes it a little further back. it still lubricates the chassis but does'nt drift onto the exhaust disbelief

the rocker cover/top vent I have re-machined/re-directed and now goes into the induction side of the air intake...

mmmm smellless peerless

and the rear seal conversion kit that I had fitted (admittedly back in the 90's) is leaking as bad as the cork ****e!

Date: Feb 12, 2012

Thanks, both In California, letting everything blow out on the road would be asking to be locked up forever.... On these suggestions, I'll figure something out that works Dave

Date: Feb 13, 2012

Hello Dave,

another alternative is to run an outlet hose from the rocker cover into a flame trap and then into the inlet manifold. The Triumph TR6 trap 603330A or TR4A 13H5191 version should be ideal. The TR4A version is a PCV valve, very similar to the Vitesse/GT6 set-up I have on my Spitfire's six-pot. It should be available secondhand for reasonable money, should you not want to sell a kidney buying new.

The relevant Moss catalogues have diagrams/prices.

All the best.

Gary

PS Nigel, was that your oil slick I witnessed in your neck of the woods a while back? Now I understand.

Date: Feb 16, 2012

This should be so straightforward.

The core plug in the lower breather hole is standard TR4 practice, and means that all the pressure and oil mist comes out the top of the engine.

Yes, you can pass this from the rocker cover through a flame trap/PCV valve and into one of the air filters (again standard TR practice)

But....

Make sure that you have the modified crankshaft rear seal or it will blow oil mist onto the clutch as well. The TR3 scroll device doesn't really retain pressure.

The Flame trap/PCV valve will need to be regurlarly cleaned/replaced or it will block with condensed oil/moisture/mayonnaise goo and the lump will then leak oil from every seam.

Passing this noxious mix into one of the air filters to burn it off makes the carbs more difficult to balance and can mean that the associated plugs get oiled more often. At least the mess doesn't end up on the road.

Piping it into a 1-litre catch tank with an exit filter is standard competition practice and mandatory for race scrutineering in the UK. Real tightwads (AKA Peerless owners) will then periodically empty the catch tank back into the sump once the oil and water have separated out.

F

Date: Feb 16, 2012

Thanks Frank,

it's an issue I'll need to tackle with my engine and I will be doing the oil seal conversion. As for my Spit's PCV/flame trap it has never needed regular cleaning in 15 years, nor did it oil my plugs. I check it every year but it's always been fine. If the engine is run up to temperature for long enough (as in on a run, not idling on the driveway) then any mayonnaise/condensation will be burnt off, so it shouldn't be a problem. Good quality oil is also paramount.

All the best, Gary