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MG Midget and Sprite Technical - Converting from 1098 to 1275

I may have raised some cash by the sale of another vehicle. Whilst I don't really want to spend this on a new engine for my midget I am still compelled to price it up out of curiosity. Currently have a 10CC engine. What I don't know is what will be needed for the conversion. Has anyone done this before and can point me in the right direction.

What am I likely to need to buy / need to know:

Replacement dizzy?
Re-jet carbs or new carbs?
Different flywheel?
Depending on the manifold connection - a new exhaust
I presume and hope the engine mounts to the same brackets?
Any clutch issues?

What else?

Thanks.



Stuart K

Unbolt - refit.

Mark.
M T Boldry

Most of the above.

Ideally, you can pick up an engine with most of the right bits attached.

There are slight difference in distributor and carbs.

The flywheel is considerably different, as is the clutch - friction plate, pressure plate and thrust bearing.

The clutch slave cylinder and flexible hose are also different.

As it's a 10CC, the exhaust and manifold should be the same.

The engine mounts are the same.

Depending on the age of the 1275 engine, the thermostat housing may be pointing in the wrong direction. You can't use the 1098 one as the orientation is different.
D O'Neill

So there are differences. What does it actually involve? I've changed a flywheel and clutches before but only like for like. Do I just replace the clutch parts for 1275 ones and it all fits nicely?

If the flywheel is different do I need a different starter?

Does the slave cylinder swap out for the new one?

In other words do I just source the parts and drop them in or is it more complicated than that?

Bear with me. On a steep learning curve here. Potential large expense outlay and could end up with a pile of non working parts!
Stuart K

Stuart.

Use the 1275 with its own Flywheel and Clutch, the slave cyl is attached to the gearbox, so at this stage I wouldn't worry about that, distributor and carbs would also ideally be from the 1275.

As Dave says, you MAY need to swap the clutch thrust bearing and possibly the thermostat housing, but it really IS a unbolt your 10cc engine complete with ancillaries and bolt in the 1275 again, complete with ancillaries.

Now, find yourself a 1275 engine......

Mark.
M T Boldry

I agree that as a unit the engine istelf is a direct swap, and use the 1275 flywheel & clutch.

However, the clutch thrust bearing definitely has a different offset of the lugs, so should be changed. Also, the clutch slave cylinder is a different size - the 1100 one will over-stroke. (see my posting towards the bottom of the recent 1275 clutch won't disengage thread). The pushrod is also different and should be swapped.

The distributor has a different advance rate, so don't swap that unless you can help it. (The car will still run, but not as well).

Finally, don't throw out the old engine - it was unique to the Midget so is relatively rare, and sought after by some owners wanting to return car to original. Also the head is sought after, and the crank with it's extra stroke can be fitted to the 1275 for a another 40cc or so. It's not a direct fit but reasonably easy to do for someone who knows their way around.
Paul Walbran

Stuart - don't underestimate the six dots at the end of Mark's message. Judging by the pleas that appear on here from time to time, good 1275s aren't so easy to find.

Do 10CC Midgets have disc brakes?
Nick

Both 10CG and 10CC had disc brakes.
Paul Walbran

perhaps we need to do an international trade


Will ship you 1275's and you ship us serria type 9s

Prop...Then there is that whole mexican drug cartel thing...Prop
Prop

There are 1275 engines about...if you know where to look ;o)
D O'Neill

yes and most of the time the 1275 's you find need rebuilding....
Onno Könemann

I've been collecting and hoarding 1275 engines for years and think I probably have 6 or 8 about the place. Sadly, I'm NOT looking to sell any at the moment.

;-)

Mark.
M T Boldry

I mentioned on your other thread, I have a Marina short motor and modified midget flywheel to fit it.
Tarquin

Prop you suggesting you'll pack the engines with drugs.....or hide the expensive 1275s inside the cheaper drugs ?
Dean Smith ('73 RWA)

This thread was discussed between 13/05/2009 and 15/05/2009

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