MG-Cars.net

Welcome to our resource for MG Car Information.

Recommendations

Parts

MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo.

MG Midget and Sprite Technical - midget 1500 breather pipes question

Im thinking of removing my rocker cover breather pipes on my midget 1500 which currently vent into the twin hs4's .

The plan is to replace them with a K&N filter on the rocker cover and block up the pipes on the hs4's where the breather pipes connect to .

However im sure that ive seen somewhere that the oil filler cap on a 1500 needs to be non vented . That being the case surely the k&n filter will be venting the rocker cover ?

Am i ok removing the pipes and replacing with a filter or does the rocker cover need to remain non vented ?


D Stratton

I believe, as ever please correct me if I am wrong, that the system is designed to create a partial vacuum in the engine (crankcase, sump and rocker cover) to help discourage oil leaks.
As such the oil filler cap needs to be non vented or a partial vacuum would not be achieved.
I would leave the breather pipes as they are, assuming good condition, unless you are building a one-off engine for sport,say, and will be setting up the carb jetting etc to cope with a different air flow situation.
JB Anderson

JB thanks for your reply , think i'll take your advise and leave it as it is
D Stratton

This thread was discussed on 10/01/2012

MG Midget and Sprite Technical index

This thread is from the archive. The Live MG Midget and Sprite Technical BBS is active now.