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Old 21-11-2007, 07:47 PM   #11
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Mines quick enough for me sits at 70 (as long as theres no hills) so i'm happy, for now
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Old 22-11-2007, 12:48 AM   #12
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i got a 1200 engine, then i turned it 1496cc

the 1970 crank case takes bigger barrels and pistons but its at that point that you notice pistons/barrels/pushrods/deflector tins/headtins/heads/manifolds are all very different.

but happily I have fitted 1600 conrods/pistons/barrels/heads(SP) to a 1200 bottom end although i have yet to start it up!

what sort of limit RPM was is the crank good for?

im thinking of sticking in one of those 4500rpm governors in so i dont break the 1200 crank.
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Old 22-11-2007, 11:39 AM   #13
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If you have fitted 1600 conrods, then the crank is not a 1200 crank.
13-1600 rods do not fit 1200 cranks...rods are too narrow.
BUT 1200 rods will fit a 13-1600 crank if you machine them, 1200 rods are too wide

1200 cranks are good to 5,000, mine often sees 5,500rpm.....they snap at anything over 6,000.......but flexing starts as low as 4,000rpm......
(if you flex them too much, metal fatique sets in and it may snap at tick over when you least expect it !!)
Bearing life on 1200 cranks often used above 4,500 is very short...expect less than 10,000 miles. The centre main wears on the sides but top to bottom remains untouched.......
If knew how to post pics, I have an excellent example.....

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Old 22-11-2007, 10:38 PM   #14
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im positive its a 1200.

the heads were 1200, the pushrods were somewhere around 1/2-1" shorter! there is definatly several mm less throw. also the air deflector tins were several fins shorter than normal.

its a unit which was remanufactured at some point im wondering if its been ground different.the 1200 conrods were shorter and obviously has smaller gudeon pins.

im going to fit a governed rotor arm which limits it to 4500rpm so i dont break it, but looking at the specs in the haynes i have the power band is lower than a 1300/1600 anyway so i shouldnt need to rev it so hard.
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Old 23-11-2007, 11:43 AM   #15
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One way of telling what crank is fitted, is by looking at what exhaust fits the motor...
If you have a 13-1600 crank (69mm) then only a 13-1600 type exhaust will fit (because the engine is at least 10mm wider)

The lil 1200 crank (64mm stroke) is narrower, which is why all 1200 engines have to use a unique 1200 only exhaust.

My guess is its a 1200 motor with a big bore kit (83mm 1385cc kit??)
This is the only big bore kit currently available for 1200's which have unique pistons machined to accept the smaller 20mm wrist pins.
(all 13-1600 motors use 22mm wrist pins)

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Old 23-11-2007, 07:49 PM   #16
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it `was` a 1200 when I got it, D code block, smaller conrods with smaller gudgeon pins, 1200 heads etc and 77mm pistons

but 1600 rods(from a fastback) fitted to the crank and being a later D code case 1600 pots fitted into the case, so then i fitted 1600 SP heads etc

one thing i did do was with the heads off on build up i used my vernier caliper to measure to stroke, which came out at 64mm

so basically im ending up with a 64mm crank 85.5mm pistons and stock length barrels resulting in slightly lower compression.

this could be a unique combination engine i have built
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Old 27-11-2007, 12:16 PM   #17
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I scratching my head, not sure how you managed to use 85.5 pistons and barrels with a 64mm crank ???

I did some sums......worked out that would give you a deck heigh of at least .250th
Thats a compression ratio of less than 5.25:1

Im surprised it 'starts'..........
Unless you had the barrels shortend / machined down ?

GaV
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Old 27-11-2007, 02:42 PM   #18
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Quote:
Originally Posted by HOT 1200 View Post
I scratching my head, not sure how you managed to use 85.5 pistons and barrels with a 64mm crank ???

I did some sums......worked out that would give you a deck heigh of at least .250th
Thats a compression ratio of less than 5.25:1

Im surprised it 'starts'..........
Unless you had the barrels shortend / machined down ?

GaV
I havent tried starting it yet

hmm nice low compression, just right for a long lifespan or a turbo!
or even TVO fuel

im just doing it for the giggle really, its built for the total sum of a gasket set all the rest are bits i had kicking about.

soon as i get the inlet manifold sorted we`ll see what happens
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Old 28-11-2007, 03:29 PM   #19
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Good Luck, let us know how it goes....
Ive got my vintage HOT 1200 to build this year.......
So far.......
1967 small bore 1200 case and entire bottom end
ERSON V300 cam (vintage early 70's cam!!)
1300 twin port heads
Twin Dellorto FRD 34's (baby dells)
but also have a twin Dellorto DRLA 36 kit (depends how brave I feel)
Not sure about pistons...
cant decide between 1192cc or 1385cc big bore kit.

GaV
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Old 29-11-2007, 12:13 PM   #20
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Quote:
Originally Posted by HOT 1200 View Post
Good Luck, let us know how it goes....
Ive got my vintage HOT 1200 to build this year.......
So far.......
1967 small bore 1200 case and entire bottom end
ERSON V300 cam (vintage early 70's cam!!)
1300 twin port heads
Twin Dellorto FRD 34's (baby dells)
but also have a twin Dellorto DRLA 36 kit (depends how brave I feel)
Not sure about pistons...
cant decide between 1192cc or 1385cc big bore kit.

GaV

Be brave Gav - the force is with you .............
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