13 replies to this topic

[Philminim]

Hi, I tried this site https://www.minimani.../Cylinder_Heads

 

Can't see anything that relates to mine - unless I am reading it wrong? 

 

Is anyone able to help? Thanks a lot.

 

 

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Edited by Philminim, 17 January 2024 - 04:16 PM.

[Spider]

The Casting Numbers that are normally used for cylinder head ID is under the rocker cover area of the head, commonly but not always, in the middle of that zone.

I don't think that number you've posted up is it.

[nicklouse]

Won’t it just be an A+ mould number?

[Lplus]

Age of engine? size of engine?

[Philminim]

850cc magic wand. Believed to be old van engine.

22g68 gearbox.

I will take a closer look for casting number on head as I pull it apart. Cheers

[Spider]

Originally, it would have been fitted with a 2A628.

[Philminim]

I have some other details now. I was told it was an 850cx van engine...just looking to prove it. It doesn't have the Inlet manifold or distributor with it. Hopefully the above will help . thanks

12a497 engine case
65mm bore
Dished pistons
Blanked off fuel pump
Magic wand box 22g68
12g202 head
Round inlet ports
Inspection hatches block sides including steel pipe off one of them

[Spider]

That's a 998 / 1098 block - they used the same one in both engines, though, from the gearbox you have, I'd say yours is a 998. The difference in these engine capacities was achieved by using the same bore size between them with the 1098 having a longer stroke crank.

The head though, being a 12G202, was used on the 1098. These do breath better than the heads originally fitted to the 998, though unless it's been modified and / or flat top pistons have been fitted, it might be down on compression ratio.

I'd suggest establishing if the head and / or the cam have been modified, that will guide your choice on Inlet manifold and also the curve of the distributor you need.

[Philminim]

Ok thanks. I know enough about head mods to say it's not modified..I doubt the cam is, so standard then and now it's just a case of checking the crank for stroke. So it's an early 998 or 1098 (pre 62 or something?) Because of the fuel pump blank it seems

[Philminim]

Although your previous message on the other post I had re the fuel pump blank implies it's an 850cc?

17 Jan 2024
The early 850 blocks, along with the (997 ?), 998 Cooper and all Cooper S blocks had that cast in and never machined as an open hole.

The stud is fitted there as a steady point for the open pipe crank case breather some of these engines were fitted with

[Philminim]

I think I have a Frankenstein engine here..

[timmy850]

Does it have a large/thick crank damper or just a pressed steel one?

 

I guess another option is that the top end of the engine is a Cooper 997 - some used the 12A497 casting and a 12G202 head.

 

Does it have a magic wand style diff cover? Or are you guessing it's magic wand based on the 22G68 number? Some early remote change boxes used a 22G68

[Philminim]

Thanks for the help here all. I will take a look and post again maybe next week. because I am busy next few days. I will include some better pics now I have it on stand and I can take a closer look at the bits yous asked above.

Cheers

[Spider]

Although your previous message on the other post I had re the fuel pump blank implies it's an 850cc?

17 Jan 2024
The early 850 blocks, along with the (997 ?), 998 Cooper and all Cooper S blocks had that cast in and never machined as an open hole.

The stud is fitted there as a steady point for the open pipe crank case breather some of these engines were fitted with

 

Generally, if the car that the engine was originally fitted to, regardless of capacity, was factory fitted with an electric pump, then the mechanical fuel pump mounting point wasn't usually machined on the engine block.