post a pic - it helps tons

We are visiting family for the holidays. I will check as soon as I get home. Thanks 

"....... My heater takeoff is at an angle. ...."

Then its probably a 1275... You can put a 1275 head on a small bore engine but it's not usual.

Are there bolt on plates on the back of the block? Does it have cast ribs like the one in the video?

Going by the head, I'd just settle on "1275" unless there's some reason you really want to know the actual capacity??

Chewers, Ian

I finally found a K&N air filter that fits my Dellorto DHLA 40 carburetor. 

Ian. My heater takeoff is at an angle. I cannot find any casting numbers on the block. It was my hope to not have to take the engine apart. 

I will look at the video. You are probably correct in that work was most likely done to the engine. Thanks. 

Thanks for the suggestions. I will try them. 

I'm here! I think PilotClem is legit. No visible or hidden dubious links. Just a reasonable "newby" question.

PilotClem:

Welcome!

Ian's comments are a good starting point. Your engine number might be missing for a couple of reeasons. The block surface may have been machined to make it level and smooth again, which would have shaved off the number plate and its rivets. Or it may have been chemically dipped, which would have dissolved the aluminum number plate. Either scenario suggests the engine was properly rebuilt at some point.

Here's a link to a Barum Engines video, where (about 5 minutes in) he is drilling a Mini block to put an extra head stud in. Later on (about 13 minutes) in the video, there's  V8 block on the same milling machine having its deck resurfaced. You can see the size of the milling head in comparison the the cylinder bores of both the V8 and the Mini block. Near the end, he shows the Mini crankshaft, flywheel and clutch on the balancing machine.

The Mini engine in the video is a 1275 A+ engine, a later one, where the engine number is stamped into the cast iron rather that the early ones where the number was riveted on in the same place. You can also see the angle of the holes for the heater valve in the 1275 head.

Where's Dan? I'll say it - Spammer.

Hi Clem(?)

Not an easy problem to solve .... noting the number of different options built and the number of years Mini engines were available...

Maybe look to see if you can find a casting number (front lower right corner of block)?

Big bores (1275/S based) can be differentiated from small bores (850/998/1098) by the angle of the heater take off fitting (on the head). Perpendicular to crank = small bore, angled = big bore. This is not foolproof as either type of head can be fitted to either block (but probably not very likely).

Other than that I can't think of an alternative to removing the head to measure bore and stroke....

Cheers, Ian

I just purchased a Mini 850. I cannot tell what size engine is in it. Everything that I read on how to identify the engine directs me to look for the data plates but my engine is missing all of the data plates. The car has some upgrades and I am uncertain if the engine was upgraded why the data plates have been removed.

Also, the Mini has a DHLA 40 carburetor. The carburetor did not come with a filter and I cannot find anywhere that filters are sold for this carburetor. Can someone shed light on this for me?