Ausmini
It is currently Mon Jul 21, 2025 3:16 am

All times are UTC + 10 hours




Post new topic Reply to topic  [ 6 posts ] 
Author Message
PostPosted: Wed Jun 30, 2010 3:37 pm 
Offline
998cc
998cc
User avatar

Joined: Tue Jun 14, 2005 2:17 pm
Posts: 650
Location: Brisvegas
Howdy,
Just starting an engine rebuild and not sure what direction to head with it. I have a tonne of small bore stuff so I am going to stick with that, I am after a Fast Road Donk that can sit on the highway.

Engine canidate number one.
Image
Image
This engine has been build from Ausmini user parts by previous owner.
It has an Aaron cylinder head, doogie gearbox and lillie's old short motor. As per second pick, the gurgon pin c-clip has gone walkies and left a nice score in the bore. It is a 1100 block and crank and at 60 thou at the moment. Hopefully a re-bore will clean it up with GR 100 thou pistons

Engine Canidate Number two.
Image
Image

It's a 1100 block that has been pocketed and at 60 thou. Bore appears to be in exellent condition. It has had a 12G940 head fitted in the past. I don't have a 12G940 Head so will have to source one if I go with this option. Cam bearings appear to be brand new, looks like it allso has new oil gallery plugs. Good chance this motor has had a re-bore and left to sit on the garage floor for a little while

So do I go with Engine one, hopefully 100 thou pistons, Re13 cam grind and maybe a 12G202 cylinder head with some work done on it.

Or do I go with engine number 2, maybe 60 thou pistons, Re13 cam grind, 12G940 Cylinder head.

Not sure what carby to run with or dizzy, any advise would be great.

_________________
Mini, its in my blood........


Last edited by justincase42 on Wed Jun 30, 2010 4:24 pm, edited 1 time in total.

Top
 Profile  
 
 Post subject:
PostPosted: Wed Jun 30, 2010 4:12 pm 
Offline
1275cc
1275cc
User avatar

Joined: Thu Jun 08, 2006 9:34 pm
Posts: 2372
Location: Adelaide
I have an 60. over 1100, cam, pipes, etc etc

I have a 1 3/4 su with all the Vizard stuff (pointless) done to it on a Minispares manifold.

It screams and pulls nice basically right from the bottom all the way to 6.5grand.

It idles with around 500rpm slop either way but its consistently inconsistent. .

I will rebush the su one day//

_________________
blokeinamoke wrote:
Yep Mokes are ugly - but Moke owners know that. Its like ugly women - she may be a dog but you know your going to get some :wink:


Top
 Profile  
 
 Post subject:
PostPosted: Wed Jun 30, 2010 4:55 pm 
Offline
998cc
998cc
User avatar

Joined: Sat Mar 13, 2010 4:19 pm
Posts: 840
Location: Ridin' the rails somewhere
Measure everything. While bores, crank, etc might look fine to the eye, when you measure them you really find what condition they're in.

As for the engine build itself, I start with what I want it to be (eg, road or race or something else?) then choose a cam & head combination, and then on from there.

Once you have use, cam & head worked out, the rest is just is what is needed to make that combo work out.

cheers

Jacob

_________________
'72 Clubman Van - 1022cc, 295 head, 731 cam - Daily Driver :D
'69 Morris 1100 S - Dinged by a bus, in shed under repair
'64 Morris 1100 - Early 1100, long term project



Image


Top
 Profile  
 
 Post subject:
PostPosted: Wed Jun 30, 2010 7:35 pm 
Offline
1275cc
1275cc

Joined: Mon Mar 22, 2004 7:41 pm
Posts: 4319
Location: Plumpton, NSW
Given you would want to re-bore and put new pistons in, I would take both blocks down to graham russell's and see which one he feels would clean up best.

I'd like to see engine 1 back on the road as a small bore screamer personally :D

That may well be the most economical rebuild if you don't have a head to suit engine 2.

Do you have the articles from Mini Experience on small bore engines?

KB

_________________
Image


Top
 Profile  
 
 Post subject:
PostPosted: Wed Jun 30, 2010 7:36 pm 
Offline
religious status
religious status
User avatar

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39754
Location: near Baulkham Hills, NSW
S/H bores are never as good as they look. If it's pre-loved, I would rebore and fit oversize pistons as a matter of course. And of doing that you may as well give it some cubes- I'd bore it +.080" or +.100".
As for the head, I had a 940 on my 1220 motor way back when, it went bloody hard. But you will get better torque with a ported smallbore head.
As for rockers- I'd not go bigger than 1.3:1.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


Top
 Profile  
 
 Post subject:
PostPosted: Wed Jun 30, 2010 7:50 pm 
Offline
998cc
998cc
User avatar

Joined: Tue Jun 14, 2005 2:17 pm
Posts: 650
Location: Brisvegas
Quote:
Do you have the articles from Mini Experience on small bore engines


Sure do and the power tune 998 Donk book.

Looks like a trip to GR tomorrow ;-)

_________________
Mini, its in my blood........


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 posts ] 

All times are UTC + 10 hours


Who is online

Users browsing this forum: No registered users and 87 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  

© 2016 Ausmini. All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.