setting up a 1275cc

[hotrodder13]

i am almost at the point of putting my 1275 in, i need to know what the timeing should be and the valve clearance, i dont have a hanyes manual will this show me how to do the 1275, also i finally got a smiths oil gauge what t piece do i need to keep the light and use the gauge
and what bolt thread is used to bolt the air filter onto the carb

thanks tom

[bmcecosse]

Set the valve gaps to 12 thou inlets and 15 thou exhausts - just the same as any A series really. Set the timing 'by eye' until you get it started - then swing it back and forth to get the best idle - followed by road test to check no 'pinking' Once you have it running properly - you should then advance the timing until you get some pinking (when accelerating up a hill in top gear) - and then back it off again until the pinking 'just' stops. It's then set perfectly for your engine - or at least, as perfectly as it can be with a standard dizzy!

[hotrodder13]

thanks for that just finished painting it and polishing everything, and im putting an electronic ignition on it as well.

tom

[bmcecosse]

" im putting an electronic ignition on it "

[hotrodder13]

whats wrong with that

[linearaudio]

Take no notice- he's just a bit of a Luddite!
You'll never do right now you've fitted the demon disc brakes to it!

[bmcecosse]

" he's just a bit of a Luddite! " - I like it! Nicest thing that's been said about me for a long time........

[hotrodder13]

and a servo

[bmcecosse]

" and a servo " - crivvens!!

[hotrodder13]

i didnt feel safe with drums

[linearaudio]

Saturday night and you're looking for a fight?? Keep prodding with that pointy stick!

[hotrodder13]

thats all the mods i got apart from 1275 all i need

[Pyoor_Kate]

I would definitely second an electronic ignition on the 1275, the points I got were repeatedly of atrocious quality, the heel would just disappear off them and after 500 miles I'd be setting and resetting the points just to keep any gap at all....

[silverfox]

The Haynes manual recommends 12 thou for both inlet and exhaust.

[PSL184]

15 thou on the exhausts allows for a small amount of seat recession "just in case". The original settings were for leaded petrol remember

[hotrodder13]

thanks for that, got the enigne in with just a few problems but sorted now, just started making the manifold,

tom

[silverfox]

Can you explain why leaded or unleaded makes a difference to the valve clearances. I thought the valve guides were the problem with unleaded and why should the 15 thou only apply to the exhaust valves, thanks Terry

[Mogwai]

Unleaded fuel tends to burn hotter than leaded did so the larger gap is to compensate for greater expansion of the hotter valve . Only a suitable additive or hardened seats will stop recession long term