Morris Minor Owners Club

I have just finished fitting twin carbs to a 1098 Morris Minor and have had to remove the carbon filter / breather canister from the side of the engine.

Do I need to replace it.
If so how.
What does a Sprite / Midget use as a filter / breather.

From the test run that I have just been on the improvement in power is quite impresive.

Without the breather, the only way that the pressure in the crank case can escape is through the breather tube on top of the rocker cover. This is OK for low RPM, but if you are turning high RPM (which I assume you are after fitting twin carbs ) then the pressure generated needs to be relieved.

If you leave it as it is, you may find that your oil seals / gaskets start to leak. If I was you, I would chop the canister off the tappet cover, leaving a bit of tube poking out which I would then attach a rubber breather tube to and route it to the canister which I would mount in a convenient place out of the way (by welding a bracket on to it).

Not sure how the Midget is set up, as mine was a 1500 (Triumph engine), but I'm sure you can find out by searching on the internet for some midget parts catalogues.

Glad to hear that you have an appreciable power increase!! always nice!

Cam,

I was thinking of doing something similar to what you suggested. Cutting or modifying a spare cover from the other side to take a K & N crank case breather.

The 1098 enginge does not have a rocker cover with a breather on it. Would just a modifyed / replacment rocker cover work or will I still need a crank case breather.


Having searched the web. I have found - The Birmingham MG/AH Centre

If you look at the link - http://www.pbw-mg-ah.co.uk/Parts_engine.html

The drawing on the left looks to have the right cover on it. I will phone them to find out and let you know what I have found out.


I should have also said that my power increase was also cheap. Total cost was only £60.00.

Twin carbs with manifold bought from ebay.
spare manifold cut up for exhaust mainifold.
Existing exhaust system keeped.

All I still need to buy is air filters for the carbs.

I still have have scope for modiying the setup to gain extra power if I want ( free flow exhaust, manifold ect ).


James.

James could this be another option, although I am no expert it gives you another option possibly
http://www.demon-tweeks.co.uk/catalogue ... =P/CC9024B

The 1098 enginge does not have a rocker cover with a breather on it.

From what I have seen, some do and some don't (mine did) and I have seen plenty of other 1098s with them on.

Those engine pictures are pictures of an MGB engine (B series) so that is not the same setup as the A-series, although they do look similar.

If I was you, I would either get a breather type rocker cover, or modify yours, and also make a tappet cover breather.

Kevin, the filter that you show is the right type, although the K&N type breathe and filter better than the pipercross ones. These filters will be needed in addition to the mods mentioned above.

Kevin,

Thanks for the suggestion. But what I need to know is where / how to add a crank case breather as I have had to remove the existing one.

Cam suggestion of cutting the charcoal canister of the tappet cover and adding new pipe to move the charcoal canister to a new location is one idea I have had. The other was cutting the charcoal canister off adding pipe to fit a Piper / K & N crank case breather.

If you look at the two links

http://www.pbw-mg-ah.co.uk/Parts_engine.html


The picture of engine on the left has a breather that does not go though a charcoal canister it vents straight to air. I would have thought that this would be the set up that you would add a crank case filter to on to the end of the pipe.


http://www.mgocaccessories.co.uk/acatal ... ng_37.html


If you look at the above links there is a picture ( K&N Engine Breather Filter ) showing the type of setup you would end up with if used the plate with out a charcoal canister or modifed one with a charcoal canister.


James.

James, I was suggesting that you cut the charcoal canister off and reposition it with a K&N breather on top of it.

The picture 'on the left' does not vent directly to air, but it comes up to a 'Y' piece that joins two breather pipes together which are connected to the carbs. The pipe on top of the rocker cover is a water pipe.

Although the engine is slightly different, this is what I have done:

Cam,

Yes I did understand what you meant. My main problem is the fuel bowl on the carb sits where the carbon canister normally is. It would not require that much work to cut and move the canister out of the way with a length of tubing to move the canister out of the way and fit a filter on top the same as you have done. I looking for alternative methods that other A series engine cars used before doing that.

I said look at the picture on the left. I meant the drawing bottom left. The breather pipe look like it vents to air.

Thanks for the pic's, they do confirm what I was thinking.

James.

James,

The pipe that goes downwards does seem to vent to atmosphere and must be an early MGB engine, as now I am home, I have looked at mine and it is different. It comes upwards and connects to the carbs via a few pipes.

I have also been able to look at my Haynes manual for the Midget, and the right hand tappet cover has a pipe similar to the one shown in your diagram (only MUCH shorter). This then has a rubber pipe connected to it which hangs down and appears to vent to atmosphere.

If I was you, I would get a Midget tappet cover and connect a rubber tube to it with a K&N filter at the end of the tube. This way you will not run the risk of grit finding it's way up the tube and into your engine!! Oh and attach it to your engine via a clip or cable tie to stop it flaying about!

I would not worry about the carbon canister as they are flame traps, and being as you are venting to atmosphere and not into the carb, I don't think there should be a problem.

Oddly enough, your two top pictures are the later type (like mine) and the bottom left one is the early type!! - confusing eh?? well, it confused me anyway!!

Cam,

Thanks. As always you seem to be able provide an answer. As you suggest going the Midget tappet cover route with a filter seems like the best idea.

I don't think have a flame trap will give any problems. There are lots of Rover V8 Engine's that don't have flame traps.


Thanks for you help.

James.

James,

Have a look at this:

http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... gory=27381

It seems to have a possible solution. Although I don't think it is for a Minor.