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MG MGA - Found a couple of HP

Carbies on my roadster need overhaul as throttle shafts are worn (annoying idle vaiations from 850 to 1500 rpm). Found a couple of other issues when I got them on the bench. The back plate for the K&N tapered air filters had not been installed concentric with carburetor throat (see photo) also mixture control was out of adjustment, while throttle increase was fine, the front carburetor main jet was coming down well in advance of the rear main jet (not a major problem as had no problem starting).
The advantage of removing the carbies, heat shield, inlet manifold and air cleaners as an assembly means you can easily see these problems and correct while on the bench.
Mike






Mike Ellsmore

Nice little find there Mike--So was that a faulty manufacturing issue or just bolted up incorrectly.
Nice engine bay-the torx nuts holding the thermostat housing are a nice addition right in the front making it look a bit special/custom right from first glance
Cheers
willy
William Revit

Assembly error, not sure if mine or previous owners mechanic. I cannot remember having them off before, even though I have had the carbies off as an assembly to replace jet seals. There is enough clearance in carby flange holes to align correctly. I can understand how it happened if air filter housing where fitted to carbies while in the car, gravity would take over!
That is an old photo of the engine bay, now has an alloy 5-port head.
Mike
Mike Ellsmore

Pretty similar design to the stub stacks I designed and built all those years ago. These ones of course fit the standard MGA filter canisters. The design was rolling road tested and gave a 5HP increase on an MGA with a 3-bearing 1800 engine. i.e. 88.02hp to 93.31HP at 4600RPM. They do make a difference.

Mike. Your design does not seem to allow for the air holes to the top of the piston housing? What is the central hole of the three?

Steve


Steve Gyles

Hi Steve,
These have been around in Oz for years, prior to your design. They are called HP Performance after the guy who design and distributed them. The two holes at 9 and 3 o’clock are angled up in the casting to meet the vent holes in the carburetor flange. The central hole is threaded to take the central fixing allen head cap screw to secure the alloy cap that seals the K&N tapered filter element.
Mike
Mike Ellsmore

Mike

Slightly confused still. How does that plate attach to the SU body?

Steve
Steve Gyles

Steve
These filter housings have two blind tapped holes on the back for fixing to the carburetor. These are diecast alloy housing. See photos.
Mike





Mike Ellsmore

Photo of assembled air filter


Mike Ellsmore

This is the supplier of these K&N air filter housing, hard to get these days as manufacturer is like all of us, getting older.
http://www.hi-flow.com/hp007aaf.html
Mike
Mike Ellsmore

Thanks Mike. All clear now!

Steve
Steve Gyles

Mike, are these HP filter bases available now?..can't seem to find any reference to them.
Gary Lock

Gary
The guy who was making these recently retired and sold off a lot of his gear. Email me if you are after a specfic product and I’ll chase up for you.
Mike
Mike Ellsmore

Contact Link Automotive in Mitchum Victoria.
Bryan and Hans will have them
In stock.
D McAdam

This thread was discussed between 23/07/2022 and 25/07/2022

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This thread is from the archive. The Live MG MGA BBS is active now.