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MG Midget and Sprite Technical - Oselli A600 Camshaft.

Does anyone know details of this camshaft - was described as 'fast road - high lift'

Have e mailed Oselli but not had response as yet.

Need to get a new dizzy curved up following Aldon R/Road session found mine was not working correctly (recon Moss unit).

R.
richard boobier

Oselli are not really the same company they were 15-20 years ago.

Are you sure the cam is a 600 and not an 800?

The 800 is spider drive 24/54/59/29 268 duratio, 320 thou lift full lift at 110 degress and 15 thou tappet clearances.
Daniel Thirteen-Twelve

Daniel,

The spec sheet says A600.

I've had the engine about 5 years ago - finally started up in my reshell about 18 months ago.

Runs well - think cam is fairly mild.

I had a 'Motorway spec B' engine when they were at the old site - probably 18 years ago and it was a good unit - hence why I got the midget one.

Looking at Aldon Yellow top with vac ?

R.
richard boobier

Richard,

The Oselli A600 spec from their catalogue dated May 1990 is:

'Rally', 37/71/71/37, 288° duration inlet/exhaust, 0.360" valve lift with std 1.25 rockers, 0.016" tappet clearance, 107° inlet valve full open for timing setting

It was fitted to their 1293 'Fast Road' spec engines, and as a slight de-tune on the 1293 'Rally' spec (Kent 286 was standard).

Richard
Richard Wale

Richard,

Thanks very much for that info - great !

Mine is the 1293 fast road spec engine you note.

Does the book list any other interesting facts - output / carbs etc ?

Currently running twin 1.25 with tubular exhaust.

Thanks again.

R.
richard boobier

Hi

If your current dissy is ok aldon can re-curve and that will save you some cash!!

Cheers

Mark
Mark Turner

Richard,

I have scanned the 1293 spec page into a pdf file. If you let me have your email address I will send it to you.

Richard
Richard Wale

Thanks again Richard for your help, much appreciated.

rdboobier/at/btinternet/dot/com


take out / and change the usual bits.

Think that makes my cam similar to 276 ?

By the way my first car ended up as tuned up minor in the '70s - must look for some pics.

R.
richard boobier

Richard,

The 276 has a timing of 270°/280° and the 286 280°/290°, which makes the A600 with 288°/288° appear superficially more 'hairy' than the even the 286, but Oselli said in 1990 that using the options of the A600 for a 'slightly detuned' version of their 1293 Rally engine.

Obviously a lot more to cam design than the basic timing, and would be interested to see the RR plot from Aldon?

Richard
Richard Wale

Richard,
i have a Aldon non vac dizzy going spare from my spare engine which i'm converting to crankfired ignition if your interested.
cheers
Brad
Brad (Sprite IV 1380)

This thread was discussed between 24/11/2009 and 28/11/2009

MG Midget and Sprite Technical index

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