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 Post subject: 1100s or 1275gt ?
PostPosted: Sun Mar 26, 2006 6:33 pm 
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848cc
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Location: Adelaide
Ok all, Question one in the series of a bunch.
Witch motor do i build for Lil?
The other will go into the (as yet unnamed) van
The 1100s 70.95 bore or the 1275 gt 70.6 bore motor?
1100s's rings were lightly rusted to the bore But the 1275 was blowing 500ml of oil out the pipe a week.
Both will be rebuilt (if the 1100 can be) but i need to do Lil's first so opinions please :)
Ps i'm thinking of supercharging Lil or the van so bare that in mind and sugestions on witch to charge would be nice. So i guess that was question two as well.
P.S. Three. Can 70.95 still go more?
P.P.S. Lil is in the pic and the van is in a million pices in the shed

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One rusty assed delux shell
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 Post subject:
PostPosted: Sun Mar 26, 2006 6:58 pm 
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I would pick either, and just bore it to next oversize.
Your 70.95 is an oddball size, probably it's stock with worn bore.

You can get 70.6 (std), +.020", +.040", +.060", +.094" (73.0mm), +.115" (73.5mm).

If you are going to turbo or supercharge it, I'd stick with +.040" (1310cc) ones.

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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:


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 Post subject:
PostPosted: Sun Mar 26, 2006 7:32 pm 
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848cc
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Thanks doc.
The odd size could also be due to dodgy vernier's ;)

Ok all, Question four.
Were do i start?
should i get the short motor done first and then once i've picked a cam do the porting and polishing or should i go the head that's a little cheeper and then with all the motivation of having a good head do the motor?
I guess i'm asking if there are any things in doing the head that are done to match a short motor?

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One Lill-Red 1100
A project morris van
One rusty assed delux shell
and a clubby van


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 Post subject:
PostPosted: Sun Mar 26, 2006 7:36 pm 
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deside on the block first..the 1275 or the 1100..then do the head to match.
if you go the 1100 you will take more off the 940 head..less with the 1275

Get the box done first and then you can have eather motor on top of it!!

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 Post subject:
PostPosted: Sun Mar 26, 2006 7:47 pm 
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848cc
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Hate to seem like a pillok (seem to be good at it though:))
But what am i taking of the head?
Skiming the face or?
I hope to put the same head that came of it back on and that was yes a 12g940
and why more on the 1100's?
Thanks though

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A project morris van
One rusty assed delux shell
and a clubby van


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 Post subject:
PostPosted: Sun Mar 26, 2006 7:49 pm 
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Gafmo thinks you're talking about an 1100....haha

The 1275GT and Morris 1100S are pretty much the same thing.
If one has S rods and the small journal crank I would use that, instead of a big journal one with heavy lumps on the rod caps.
They rev better and are smoother. Ask GR... 8)

I would do the motor first, and cam, the head can come later.
A stock 940 head is pretty good anyhow if the rest is right, for a road motor.
Get a spare head and mod that, then put it on later.

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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:


Last edited by drmini in aust on Sun Mar 26, 2006 8:01 pm, edited 1 time in total.

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 Post subject:
PostPosted: Sun Mar 26, 2006 7:55 pm 
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848cc
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Joined: Thu Dec 22, 2005 10:38 pm
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Ah ok. now it makes sense.

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One Lill-Red 1100
A project morris van
One rusty assed delux shell
and a clubby van


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 Post subject:
PostPosted: Sun Mar 26, 2006 7:58 pm 
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848cc
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Joined: Thu Dec 22, 2005 10:38 pm
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Thanks again doc.

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A project morris van
One rusty assed delux shell
and a clubby van


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