Hi All

I am fitting Weber DCOE carburettors to my B20 engine and was wondering what i should do with the the rocker cover to air filter hose and the crankcase breather hose

I have a early model oil filler cap as well

can anyone advise if fitting an oil catch tank would work and how the routing of the hoses would be

Thanks in advance for any advise

Cheers David

What intake have you got?
On mild to medium motors, go to B20 PVC system & keep the oil clean.
On strong motors I use to just take a couple of long lengths of garden hose and zip tie them in to a foam sock under the baterry box, but this is a big space behind the LH headlight on my 140's.

Today, if you have a strong motor, I would make/get a puke can.

I run webers on my B20 (now out to 2.5litres) on my 144 rally car.I run a hose from each of the rocker cover and the breather into a y piece and then on to a catch an mounted where ever you can. In my case, it's next to the radiator. Local race rules means it has to be 3 litres because the engine is over 2 litres. A challenge to fit something so big in the engine bay.

We've done several long distance rallies without any problems. It's certainly not legal from a vapour control point of view.

Regards
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JohnH, Sydney, Australia

Just one thing which I think is important (and which you may know anyway) - whatever you do you should ensure you have adequate breathing, which may differ from car to car. I set up a catch tank on a Triumph for competition and it clearly was not allowing adequate breathing - I got lots of emulsion under the valve cover after leaving it in place too long, obviously water was being retained rather than vented.
Ian F

That sounds like a weeping headgasket.

What Triumph?

A long door TR2 (1954). It wasn't a head gasket, just a worn engine allowing blow-by. It was OK after I rebuilt the engine, but I did always by pass the catch tank when not competing. The breather was simply a largish pipe from the crankcase down into the airstream under the engine. It liked to breathe!
Ian F

Good advice. My catch can has a little round filter - maybe 2” x 1.5” - on top. This seems adequate. The bit of oil in the can after a long event is a little emulsified but the valve cover has been clean.
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JohnH, Sydney, Australia

How's that 2459cc beast going? I remember it's low compression, but why?

Do you know what's in it?

Dyno'ed?

Was your donkey builder the VolPro guy from Brisbane?

Can you send me an email to B20Paul AT yahoo DOT com DOT au please? I'd like to know how hard it is to get stuff from EU to AU.

It’s going well. We did COT 2018 to try it out and then Peking Paris 2019 as a serious outing. No engine problems other than I didn’t take enough jets for the Weber’s to cope at 2500metres.

The innards came from Ben Flierman at Tinus Tuning in Holland. Billet crank, forged pistons and rods. His TT4 cam. Not good for big power (abt 115hp at the wheels with rally tyres, IIRC) but a flat strong torque curve. It pulls very well, which is what I wanted.

Big bore 4:2:1 header from KG Trimning feeding a 2.5” system.

Built with low compression (9:1) to cope with expected low octane fuels in Mongolia. I also ran a 123 dizzy so I could switch to a retarded curve on the fly if I heard pinging. We came 6th out of about 105, so the engine was a major part of that. A lot of the success was the car was strong and I didn’t loose time repairing it. A couple of repairs but spanner checks each night was pretty much all that it needed - apart from rear shocks.

Gary Comerford (Volpro) did build the engine. He did well, I think.

Will email separately.
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JohnH, Sydney, Australia

Ben Flierman at Tinus Tuning is a great guy, you send money, you get parts! Not like the bandit from New York State at all.

Ben posted here in the past, but he's way too busy sending people bits they paid for.

Glad you're happy, when you catch the BHP bug, that bottom end will take WAY more power.