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MG TD TF 1500 - Did I miss a tech service bulletin?

How to butcher your intake at the expense of your filter?

First the one that came with my TD

MG LaVerne

And this I discovered on Bill's TC...WTF?

MG LaVerne

Stage 6 performance tuning!

Kind of defeats the whole point of an air filter, huh?
Jack Long

LaVerne, at least yours has good water drainage! Grin. PJ
Paul S Jennings

Maybe it was too heavy??
George Butz

Can you imagine someone deliberately taking off the airfilter assembly, drilling 24 holes in a perfectly good part? Why didn't he just leave it off?

I bet this guy was so confused he didn't even remove the metal shavings left after the copious drilling and killed the engine when it inhaled the crud!
Willem van der Veer

....I would also be worried about running the upper rad hose into the valve cover..... :)
gblawson(gordon- TD27667)

Before anyone gets too carried away in condemning the driller of the holes let me point out that the driller of the holes in the TC manifold was in fact the MG factory.
Cheers, Hugh Pite
H.D. Pite

Yep, Hugh nailed it....factory modification.
Gene Gillam

The "snorkel" on the factory TD intake was very restrictive. You could pick up 10 mph by just removing it all together and running without.
The TC intake was drilled at the factory, that picture is correct. The "filter" was literally metal gauze, much like Brillo pads coated with oil. This system was good at baring rocks and small birds from being sucked in to the carbs, but that's about it.
D. Sander

OK good to know....why bother with the air filter assembly then?
MG LaVerne

Indeed. Good question. I'd love to know. Bud
Bud Krueger

Reminds me of a story I was reading recently about a guy who drilled his conrods to save weight.

M Magilton

This from a discussion years ago on the TABC site: Holes are original MG, probably a hold-over from the VA. See Service
Information sheet #66, October 1938. Holes drilled to improve engine
performance between 1000 and 3500 RPM.

Info was provided by Bob Grunau
Gene Gillam

Anybody care to answer LaVerne's question? Bud
Bud Krueger

Clod stopper
Dan Craig

So I did miss a tech bulletin Gene :-) I forgive came our 16 years before I was born.
MG LaVerne


Since the early MG's didn't even have air filters I don't think the factory considered where these holes were placed (bottom of air intake just above the intake manifold) to be a source of particularly dirty air.

Gene Gillam

To my knowledge, the air (filter?) canister also served as an intake silencer. If you for instance, examine a TC can you'll see how the factory routed the air around the inside of the can supposedly to that end. Don't know how effective it is.

Brian Warmuth

Just a note re air filters on the TF. I fitted a couple of K&N circular elements (sorry, lost the number) into the TF casings. Needed spacers, as the K&N's were thicker. Fitted stub stacks and left off the original TF outer, drilled, mesh. The K&N's are actually smaller diameter, so I cheated by pushing them up from the bottom to fit the visible area.

Point is that I did this while doing a series of dyno runs, and gained 5 HP at the wheels just with the filter change.
D A Provan

This thread was discussed between 26/01/2014 and 24/02/2014

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