Jump to content

Crankcase breather - advice needed


Recommended Posts

Hi All

I'm a new member to the CT club having purchased my first classic, a 1972 Spitfire mk4.

The spit has had K&N pancake air filters fitted to the twin SU's in place of the original air filter box and I assume the inlet manifold has been changed from stock as the crankcase vent pipe now runs down the side of the engine with a small filter on the end.

I assume this has been done as there is no where to connect the pipe on the manifold.

Problem is that my better half is complaining about the faint smell of oil vapour in the car.

I would appreciate any advice regarding other options,  ideally I would like to vent back into the manifold but understand that the positioning is important with the pipes originally connecting very close to the carbs.

Also interested to know what the benefit is of not venting to the manifold as this appears to have been changed intentionally I assume for some sort of performance benefit.

Link to comment
Share on other sites

6797 wrote:
You sure it's oil vapour and not fuel? Not sure about the MK IV,but my '78 1500 has a connection on the top of the fuel tank that needs blanking off... replacing the blanking got rid of 90% of the petrol fumes smell on my motor.

Definitely oily smell rather than petrol

Link to comment
Share on other sites

10041 wrote:
Thanks for the advice fellas.

I have gone down the route of buying the pcv valve and removing the blanking plug on the manifold to install it that will basically give me a mk3 set up.

I'm not sure there is a blanking plug, it's a while since I've looked at one of these but I'm pretty sure that hole has not bean drilled out whilst in production, so that would be a machine shop job after the manifold has been removed


Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...