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1220...
https://ausmini.com/forums/viewtopic.php?f=5&t=12348		 Page 1 of 2
Author:  jbeenz [ Thu Oct 20, 2005 1:28 pm ]
Post subject:  1220...
ok, so ive brought a 1220 motor...in pieces
its an ex race engine, the block is all good looking, no wear ridges, i can still see the hone marks, its been pocketed.
i have a 12g940 head that has been recond.(standard)
lightened, balanced shot peened rods
the imp pistons are all good and look to have been balanced as well.
(can get gudgens and rings from impwerks)
so,
ive got to grind the crank to 10 under
ill use the 1275 cam that came with it, its all good, dont know its specs.
ill be using a spider drive oil pump
i suppose i should lighten and ballance the flywheel.
then put it on top of the rebuilt remote box with centre pickup.

ill use an hs4 and a polished metro inlet with extractors and 2" straight through pipe that i currently run on my (slightly stuffed) 1275

now, is ther anyone who knows much about 1220's out there?
im wondering what sort of pover i can expect to get out of this little lump,i know itl hve bags of torque. i know its really going to depend on the cam.

ill use the car for some city driving but mostly for travelling between auckland and whangarei(m in nz) so she sits at 100k for 2 hours at a time, so ill be running a 2.9diff(im a student so cant afford to rev the **** out of it all the time)
Author:  kazjim [ Thu Oct 20, 2005 3:29 pm ]
Post subject: 
Slightly Offtopic...Could you please post some pics of the Block Pocketing ?

Cheers
J
Author:  drmini in aust [ Thu Oct 20, 2005 9:01 pm ]
Post subject: 
I've built 4 1220 motors altogether.
1st one was in my 850 back in 1968, with twin HS4s and a 544 cam and 940 head it did mid 16s for the 1/4 (but 145x10 tyres were all crap back then).

Power? I dunno- but when I finally blew it and fitted a 1275S short block instead, with same cam head carbs etc, it went slower.

Last 2 motors used late Sprite blocks and went into 2 Morris Minors.

Problem with a 1220 now is getting decent Imp pistons without paying an arm, a leg and your firstborn. :wink:

<edit> BTW, Imp pistons on a longstroke 1100 crank do have a habit of losing their circlips (& the pin then shags the bore).. Last 2 motors I built I used PTFE `buttons' instead.
Author:  jbeenz [ Fri Oct 21, 2005 4:11 pm ]
Post subject: 
i can try get pics of the pocketiin, cant promise though.

thanks drmini.
i hope these imp pistos hold together, they llok fine,and havent done much work, have also been balanced...thanks for the heads up on th clips, i will definatly look into that, ill ask the imp guys if they have problems. new pistons are one of those nasty "P.O.A" prices. rings are similar price to mini ones, which is nice.
i just fonnd a 12g202 head with double springs in this lot, in real good nic...$170nz is going a long way this week. hahaha
Author:  drmini in aust [ Fri Oct 21, 2005 5:44 pm ]
Post subject: 
circlips in IMPS don't give much prob, their stroke is only 61mm or so.
My bro' used to rally them.
But, when you ask them to go up & down 83.7mm, and rev the crap out of them, (like 8K+) they can & do come out. All to do with piston speed. :wink:
Author:  9YaTaH [ Fri Oct 21, 2005 6:01 pm ]
Post subject:  Ask the Brits!!
I think I can safely say that there wouldn't be too many Aussies all that familiar with the ins and outs of A+ donks.....however......

http://www.theminiforum.co.uk/forums/index.php?act=idx
Author:  jbeenz [ Tue Oct 25, 2005 11:11 am ]
Post subject: 
ill definatly go to buttons, i not keen on breaking this one. i think ill still limit it to 7k, i didnt think itd make it to 8k with that stroke :shock:
Author:  drmini in aust [ Tue Oct 25, 2005 8:34 pm ]
Post subject: 
It'll make it past 8K (mine did 8500 often), but the crank won't last at that speed. I put 8 cracks in a new 1100 crank in 20,000 miles.. :cry:
Author:  jbeenz [ Wed Oct 26, 2005 7:03 am ]
Post subject: 
ouch :shock:
NOTE TO SELF: make sure they crack test the crank before grinding....
Author:  Spaceboy [ Thu Oct 27, 2005 11:48 pm ]
Post subject: 
whats a good rev range for an 1100 crank etc?
this is why i like 998's better
Author:  drmini in aust [ Fri Oct 28, 2005 5:54 am ]
Post subject: 
Revving an 1100 to ~7K is OK, no problem. Ask Graham Russell... :wink:
Vizard is wrong here- they are stronger than you think.

I do like 998s too, but you are giving away at least 5-8 ft/lb torque... which is more useful in a road car than sheer rpm (and less HP) is. 8)

read this artice by Keith Calver too- http://www.minimania.com/web/SCatagory/ ... ticleV.cfm
Author:  marcsvenson [ Fri Oct 28, 2005 10:16 am ]
Post subject: 
Has anyone put a 3.1 drive ratio in their 1100
say if it had a slightly worked head, cam exhaust would it pull this ratio ok i find my 1100 which is stock as at the moment seems to run at of legs quicked then my worn 998 almost

oh yeah it does have a late model 998 box under it :?:
Author:  cush [ Fri Oct 28, 2005 11:11 am ]
Post subject: 
drmini in aust wrote:
read this artice by Keith Calver too- http://www.minimania.com/web/SCatagory/ ... ticleV.cfm


Keith Calver wrote:
To this end I employed the services of a couple of my 'foreign friends' over in Australia. They sourced and sent me a couple of sets of the Hypatec pistons available over there - somewhat stronger than the AE ones available here. Thanks Jacob, and especially Kevin - who posted them over.


:?: hmmmm
Author:  jbeenz [ Fri Oct 28, 2005 11:29 am ]
Post subject: 
that is a really good read, i cant wait to get the 1220 going now.....hmmmm who can i steel money from.
Author:  Spaceboy [ Fri Oct 28, 2005 11:35 am ]
Post subject: 
lol
54hp at the wheels is pretty good

how do you make a 1220?

and can you make an a series bore/stroke square and does that result in revs
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