Jump to content


Photo
- - - - -

1275 "12H" Engine - Ado16 Or Not?

engine

  • Please log in to reply
5 replies to this topic

#1 Dunk1302

Dunk1302

    Just On Tickover

  • Noobies
  • Pip
  • 9 posts
  • Location: nr Peterborough

Posted 08 October 2020 - 09:41 AM

Morning all...... I'm currently rebuilding a 1275 engine to transplant into my 998 mini. I've been trying to narrow down it's age, to help with the timing settings, etc but so far the best I can manage is "maybe early 70's".

 

The engine prefix is 12H159C, and all the online resources say this is from an ADO16, which makes sense - it came with a remote gearbox, which I've swapped for a rod-change to match my car.

 

However..... here's the confusing bit - from what I've read, the early ADO16 engines were "12G", a de-tuned Cooper engine, and the later ones were "12H"..... BUT these 12H engines were (I believe) 11-stud, while mine's only got 9

 

Could this be from some other related vehicle? Maybe an Allegro or Marina (post-ADO16)???

 

Any help narrowing down it's birthday is greatly appreciated!

 

Cheers

 

Dunk

 

 



#2 GraemeC

GraemeC

    Crazy About Mini's

  • TMF+ Member
  • PipPipPipPipPipPipPipPipPipPip
  • 7,300 posts
  • Location: Carnforth

Posted 08 October 2020 - 09:49 AM

Your belief about ADO16 12H engines being 11 stud is incorrect - some may have been, but they weren't all



#3 Dunk1302

Dunk1302

    Just On Tickover

  • Noobies
  • Pip
  • 9 posts
  • Location: nr Peterborough

Posted 08 October 2020 - 09:57 AM

Ahhh... thanks Graeme - that threw me, when I read it.

 

Are there any other tell-tale signs that might indicate it's age? It's a pre-Valeo clutch and there's no timing-mark pointer on the timing cover (just the flywheel marks)

 

Cheers

 

Dunk



#4 nicklouse

nicklouse

    Moved Into The Garage

  • TMF+ Member
  • PipPipPipPipPipPipPipPipPipPipPip
  • 17,898 posts
  • Location: Not Yorkshire
  • Local Club: Anonyme Miniholiker

Posted 08 October 2020 - 10:05 AM

159 is just an ADO16 

 

the G versions had S rods and were there till about 71.



#5 Spider

Spider

    Moved Into The Garage

  • Admin
  • PipPipPipPipPipPipPipPipPipPipPip
  • 13,843 posts
  • Location: NSW
  • Local Club: South Australian Moke Club

Posted 08 October 2020 - 06:13 PM

I would actually say that the majority of the 12H engines were 9 stud with a few 11 stud types made for the likes of the 1300GT.



#6 imack

imack

    Camshaft & Stage Two Head

  • TMF+ Member
  • PipPipPipPipPipPipPipPip
  • 1,859 posts
  • Location: Orpington, Kent

Posted 08 October 2020 - 06:33 PM

Your engine code and remote box indicates a pre 73 ADO16.
Only the very very early ADO16 engines (1967) had any S parts but they still had the small valve 9 stud heads.
Only the 1300gt, mg 1300, and probably the wolseley and riley 1300 versions had the 11 stud big valve head with innocenti rods and crank and higher cr and twin carbs.





Also tagged with one or more of these keywords: engine

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users