9 replies to this topic

[nrwilliams]

Hello,

Hope this is in the right section.

Quick question, someone in the dim and distant past told me that there were visual differences between a 1000 and 1275 engine.

So if I am looking at a car how can I tell if the engine is a 1000 or 1275?

Any help appreciated.

Thanks

[liam-ds]

on the 998 there is no gap between the rocker cover and the thermostat housing but on the 1275 there is a gap that is the main difference that you can see with the engine in the car hope this helped

Liam

[nrwilliams]

Excellent thanks!

on the 998 there is no gap between the rocker cover and the thermostat housing but on the 1275 there is a gap that is the main difference that you can see with the engine in the car hope this helped

Liam

[Cooperman]

It is a bit more complicated than that.
The 850, 998 and 1100 engines use the same basic block. It has two rectangular cam chest covers on the back behind the manifolds.
The production 1275 engines don't have this.
However, the Cooper 'S' engines of 970, 1071 and 1275 cc do have these same cam chest covers, but also have 11 stud heads (well, 10 studs and one bolt). Some non-'S' large blocks will have been modified to take 11-stud heads, but as the cam-chest covers won't be there it won't matter as it'll be a 1275.

[lorry]

The engine number stamp will tell you also. The thermostat housing is at a different angle too.

[jameswhiles]

A 998 has tappet chest covers down the back and a 1275 doesn't

[Cooperman]

Unless it's a 1275 Cooper 'S' engine which does have cam chest covers (see my post above).
I've assumed there is no engine number plate or this question would not have been asked. The thermostat position refers to the head, not the basic block, crank & pistons which are the items which define the engine. A 998 could have had a 12G940 head fitted.

[Sir Cheat]

1275s have 5 core plugs. 998s have 4.

3 along the front of the engine and 1 at the right hand side.

1275 's' engines are like 998s they have 4 (i think)

Edited by Sir Cheat, 13 November 2010 - 03:19 PM.

[Southy]

As Sir Cheat has said 1275's have 5 core plug's these are usually around the 33mm size, where as the 998's and 1275 'S' engines had 4 core plugs.The 'S' engine's core plugs are around the 45mm size.

[Cooperman]

The easiest thing to do nis simply to look down the back of the engine. Cam chest covers = 850 or 998 (or 1098), solid rear of block = 1275. Except for Cooper 'S' (see above)
Simples.