MG
The Classic Marque

Graham. I had previously used the octagon bezel on the gear stick surround with my Type 9 gearbox and home made gearstick cover.

Breathing and reducing pressure are related but distinct as I see it.

You need to breath/vent the crankcase to remove the impurities from blowby, but that also relieves the pressure at the same time.

As Guy said, the pcv system creates a mild 'vacuum' by drawing air down through the restriction in the oil filler cap. This reduces pressure and collects the unwanted harmful blowby ...

Leaving aside the in or out of the EU for a moment, I fail to understand why anyone thinks this egate thing is even worth considering. If you go to a non EU country you have to go through normal passport control and wait your turn so why should going to an EU country be any different? Admittedly it might be a help if you regularly travel abroad for work but for the vast majority what difference do...

Graham. I got the inspiration from BBC's Bargain Hunt a few days ago. One of the items put up for auction was a Jaguar piston with the leaping jaguar bonnet mascot mounted on top. It went for about £80.

I also have a replica MG Midge mounted on an octagon screw-on radiator cap. Originals go for several hundreds of pounds. I picked up a rough bronze casting at Beaulieu many years ago. I...

Bill, I think that is broadly correct, though piston blow-by is a function of both engine condition and of revs. A good condition engine will still produce blow-by but at a higher rev or higher power output. As it wears that threshold comes down the rev range until a really knackered engine will blow at tick over speeds.

I demonstrated this on my engine by putting a neoprene glove over th...

Have I misunderstood crankcase breathing? I've always assumed that any pressure in the crankcase was due to blow-by past the piston rings meaning a top condition engine would have very little so would only need minimal breathing. I'm aware of the general test you do by removing the oil filler cap and a worn engine would be blowing smoke out but a good engine hardly anything. Is this right?

Willy,
I wasn't suggesting a pcv system, or indeed which suction or pumped system should be used. I was just pointing out that the original 1275 arrangement works at a low suction and low volume basis by limiting where air can be drawn into the crankcase void. If contriving a pumped or venturie extraction then as long as Colin also manages and restricts inflows then quite low capacities of extr...

If you want to come up the I5 for a busman's vacation I need the doors on my YT fettling in to fit. Accommodation and food etc. free and I'll even pay you gas money and overnight accommodation en-route up and down :)

All these engines need to run is correct fuel mixture, a compression stroke and spark delivered at the proper time.

Are you working through a methodical troubleshooting scheme?

Do you have fuel of the proper mix ( corroded points on the fuel pump would give intermittent to no fuel pressure as would a plugged fuel filter or no fuel / bad fuel)
Do you have compression? (Good rin...

Thanks Paul. This car will need a good owner. I am to the point in my life where I don't want any more cars, but am happy to work on them.