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MG TD TF 1500 - Anyone with K&N pancake air filters?

If you have them what did you do with the hose from the valve cover?

Tim
TD26711
Tim Burchfield

I had the opposite problem as I have a cast aluminium tappet cover and original air filters on my XPEG engine. There is no fume outlet on the cast cover, but there is an inlet pipe on the rear filter. I removed the little pipe from the rear filter and blanked it off with a black rubber (cable) plug.
N D Wallace

Tim you can delete the hose and either put a soft plug in the outlet tube or a breather cap as supplied by Moss and others

W A Chasser

Here's a simple solution. Jud

J. K. Chapin

Here's another shot. Jud

J. K. Chapin

That is not a great solution as its functionality is entirely wrong. Taking the vent to the air filter is so that crankcase / valve cover fumes can be consumed via induction. A filter on the valve cover won't do this and the filter could be operating in reverse to its designed functionality.
Dave H
Dave Hill

Get filters for a TF that have an inlet in the back of one of the backer plates?? Jud
J. K. Chapin

As in the std Vokes filters and fit cut down K&N filter elements.
Dave H
Dave Hill

I was unable to find a seller for new Volkes air cleaners and the used ones were quite costly. I should have mentioned the air cleaners are for 1 1/4" H2 carbs. I'm thinking of cutting holes in the K&N cleaner backplates and running the valve cover hose to both of them with a Y pipe. Anyone see a downside to that?

Tim
Tim Burchfield

Tim,
That should work OK. I have a similar set-up on my Morris Minor but with a single carb. Just sweat solder in a tight fitting 1/2" copper pipe bend, paint it black and you are done.

Regards
Declan

Declan Burns

Tim

What is the diameter of the K & N air filters?

I bought these cheap ones
http://www.ratsport.com/PBSCProduct.asp?ItmID=9611900
because of its small height and 140mm diameter. My old Vokes seems to be for 1 1/2". The PO had widen the flange wholes of the old carbs. I wanted to avoid this at the new set.

It was difficult to mount the hose adapter

https://www.amazon.de/gp/product/B004CLJCG6/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

in terms of the remaining space between the adapter and the chamber.

A larger diameter is helpful.





W_Mueller

Tim, Depends on how much you want to spend. Moss has the TF Volks repo set for $275.00, no modifications, fit as originals. PJ
PJ Jennings

Jud, Declan and Davae, thanks for the input. W Mueller, I couldn't find the diameter but they are for a 1 1/4" H2 carb. I plan on tapping a fitting into the middle of the intake manifold and running the hose there. I figure the crankcase fumes will be consumed by both carbs equally as in the later MGBs.

Tim
Tim Burchfield

The middle of the manifold has a balancing vent between the two sides that you might not want to mess with. Besides, you are now talking about a closed system and you would need to control the vacuum with a PCV valve.
Dave H
Dave Hill

Dave, how would a PCV valve control the vacuum? Isn't it just a one way check valve? Good point about the middle of the intake manifold. Both side connect to each other but there is a narrowing at the middle Perhaps two inlets on the manifold are a better was to go.

Tim
Tim Burchfield

Dave, with the side cover vent pipe open to the atmosphere how would piping the valve cover hose to the intake manifold create a closed system? Am I missing something?

Tim
Tim Burchfield

The usual set up is to vent all the fumes from the crankcase from the side cover or equivalent via a pcv to the inlet manifold, thus dealing with all the secondary emissions. On the MGB the valve cover had a filter inlet so there was a through flow from the valve cover to the crankcase and on to the vent system. All the various orifices were correctly sized so that with the pcv the effect on carburation was insignificant. Without all this the tickover, etc., would be very uneven, however quite a few people have fitted an MGB type system to their TD or TF successfully. I am going to do the same this winter. One big advantage, aside from dealing with emissions properly, is that the crankcase, etc, runs under a controlled depression / vacuum and oil leakage can be less than it otherwise might be.
Dave H
Dave Hill

This thread was discussed between 09/11/2017 and 10/11/2017

MG TD TF 1500 index

This thread is from the archive. The Live MG TD TF 1500 BBS is active now.