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 - exhaust manifold

Hello,
are the standard exhaust manifold the same for all the A serie midget.
I have one from a 948cc. Is it possible to put it on a 1275cc engine?
Laurent
ld derancourt

A 948 manifold will not flow very well on a 1275 and I'm fairly sure it won't fit a 1275 downpipe, either.
Dave O'Neill 2

Thank you Dave.
ld derancourt

That reminds me - I have a nice 948 manifold that came off Cherry's Derrington engine. Not big bore, but rather historic (does anybody recognize it?).
Nick

OOoops - forgot the picture.


Nick

And the other side.

I don't suppose anybody will be interested, because we tend to go for performance, don't we?


Nick

I do recognise it and I think it may have offered me sweets when I was a child.
By the way, that's a very curved radiator.
Gary Lazarus

A nice bit of welding from someone back in the day.

Prop
Prop

lucky Nick , having a radiator in your garage
David Cox

That looks remarkably like a Speedwell manifold.
Dave O'Neill 2

Laurent does that mean you took the big step in misleading French authorities:-)

But I am with you no one can see unless they are an expert.

Bas

Bas Timmermans

Bas,
A friend has a brocken manifold on his 1275cc.
As I have a 948cc manifold on stock, I would give it to him if it was the right part.
But it won't fit, so I'll keep it.

I have a 3 in 1 small bore exhaust manifold for my next 1030cc engine.

Could you confirm the 3 in 1 small bore will increase the torque, and a LCB will increase the top end power?

laurent
ld derancourt

Nick. are the ports on that manifold square or round? and is it surplus to your requirements...?

Mark.
M T Boldry

They're round, Mark. About 31mm. And I can see the marks of the square corners on the flange faces, so not a perfect airflow. Nice thick flanges, though.

Not surplus yet, though might be. Cherry's about to come off the road for an overhaul, and I'll review everything before I chuck anything out.

But I expect I'll stick with the Maniflow.
Nick

Nick

The reason that the ports are round is so that they match the round ports of a Speedwell alloy head.
Dave O'Neill 2

This is what a Speedwell manifold gasket looks like...


Dave O'Neill 2

Also, something I discovered recently is that the Manifolds are shorter for the lower CC engines.

Someone correct me if I'm wrong but I believe this to be the case, which is proving useful in my current rebuild for getting Maniflow to give me a shorter 1275 Manifold to prevent it grounding out quite so much this time around!
Rich Amos

This thread was discussed between 13/10/2009 and 15/10/2009

MG Midget and Sprite Technical index

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