11 replies to this topic

[pistin broke]

brought a enghine a few mounths ago and at the moment it is having some work done on it. The bloke i got it of did'int know much about it other than
it was a 1293 with a stage 3 head and 1;5;1 rockers.So i am trying to find out what ive got the head is an a 11 stud its had comp valves put in and as got s rods
4th gear as 18 theeth so its close rati o thanks to guess works
but now i want to know about the crank. it says en 16 b and as 12G on it as well
on the conrod journals it as 2 oil feeds both on a angle and seem to have brass inserts
.Carnt find any listing for 16 b anyone know anything CHEERS.

[Jammy]

Wasn't the EN16B crankshaft that in the Cooper S? The 12G means its from a 1275. The EN16B is hardened as standard I think as well.

[dklawson]

If EN16B was used on Cooper-S, it was LATE and probably included the 1275-GT. The early -S engine cranks were EN40B.

[Jammy]

Ah yes, sorry, was getting mixed up with the 40B

[Guess-Works.com]

If he has S rods, then it must be a 12G1287 or 12G1288 crank or a reground ( to 1.625 big ends ) crank, used in Non-S 1275 engines

[Dan]

The 12G does not mean 1275, it's a casting number for a blank crankshaft core. It could have been machined into loads of different sizes as Guessworks list suggests.
12G's were also made to 1100 sizes among other things.

You won't find a listing for 16B as it's not a part number, it's a material specification. Meaning it's the name for a type of cast iron. EN16B however I am almost sure wasn't used for Mini cranks. EN16T was (and that was the grade for certain Cooper engines), as was EN40B for the majority of cranks as DK pointed out.



****


Ok, so I got that the wrong way around above. EN16T is the more common grade and was used for basic 1275 cranks (and the very last Mk111 Cooper S which was very much de-tuned compared to earlier ones, but in this engine it was also Tuftrided) and EN40B was used for Cooper S cranks as it's a better grade of iron.

Edited by Dan, 24 August 2005 - 08:53 AM.

[pistin broke]

12g1392 is the number on it AEG521 is on the rods which i am told are cooper
i have had it bored to 1330 with a center strap added. is the stroke 81mm
or were they different in any way.cheers :cheese:

[Dan]

Well, as I thought EN16B wasn't used for Mini cranks, and that part number isn't a Mini crank. If it was it would be on the list that Guessworks posted which was fairly exhaustive. Possibly a crank from a 1300 or an Allegro or something. I'll see if I can dig up the part number somewhere and track it down.

[pistin broke]

Hey thanks for that.Like i say would like to know what i,ve got
every one i ask hav`int got a clue.Is there a chance the stroke could change
any help is great. :grin: :cheese:

[Guess-Works.com]

You can change the stroke, but not with the crank you have, you will need to purchase a stroked crank...

*cough* one of which I have sitting on my kitchen table *cough*

but to be honest I would not bother.. nothing wrong with 1330's

[Dan]

I've been and had a really good look around. I can't find it anywhere. The only way to find out about it is to get it measured.

At a guess I'd say it could be from some kind of BMC 1300 based car, but not an MG1300. I just don't think the material is right for that. In fact the material makes me think it's quite an old unit. Since the standard Mini crank is made from EN40B and EN16B is nowhere near as strong as that I can't think it would be more modern than the Mini. EN16T was used for the Cooper S as said above but that's because it's a tempered steel and I don't think EN40 can be brought up to the same T grade hardness by tempering so they used the EN16 (and then Toughtrided it as well). So you'll want to get it nitrided at least to give it some more hardness. Could be just about anything really, but assuming it has got a transverse sump transmission type crank tail and the Cooper S size big ends as you describe then it kind of limits you to the 1300 range of cars. Possibly something like a Riley or Wolsley 1300. Or it could have already been stroked, giving it the smaller con rod journals in the process. In which case it really could be from anything.

Anyhow it's late and I'm just rambling really and I must go back to work soon so I'm off.

Get it measured properly by an engineer.

[pistin broke]

nice one going to pick my block up tomorrow
so see if i can get it mesured.Thanks for the advice.
:grin: