MK3 1300 Economy Engine

[sheffieldcortinacentre 767]

Head gasket makes no difference, in 70s crossflows it was the piston type ( size/shape of bowl in the top) that determined compression ratio from the factory.

It's because it was a based on the high comp eng, again from memory I think the 1300 low comp version was only avl in the escort not capri/cortina.

In practice they where slightly less economical than a normal version as they need more throttle to compensate for the poor performance response. Low mileage survivors exempted most will have had the carb & dizzy replaced due to wear & tear long ago with std parts.

Edited February 16, 2017 by sheffieldcortinacentre

[wolfrace 116]

Sounds similar to the low comp pintos where they changed the pistons in the transit engines. Both my 1300 cortinas were HC the FL one went a bit better than my PFL for some reason, at the time there wasn't much in it between that and my mates tawny xl 1600 xflow.

[Danish 294]

Sounds similar to the low comp pintos where they changed the pistons in the transit engines.

 

Yup. I assembled a LC pinto and it was just the pistons. Con rods and crank were the same as the standard Sierra engine.

[pancakedan 0]

That's the single choke one if memory serves. Then yes.

I've found a Weber with the same venturi diameter as the standard 1300 carb (25mm). Once fitted, will I need to make any changes to the dizzy?

[sheffieldcortinacentre 767]

Doubt you'll need to it won't hurt to check timing,gap etc as doubt you'll notice any change in poker.

[pancakedan 0]

Thanks

[pancakedan 0]

Doubt you'll need to it won't hurt to check timing,gap etc as doubt you'll notice any change in poker.

Can you successfully tune the Weber 34 ICH without a rolling road?

[sheffieldcortinacentre 767]

All you can do is mixture .

[pancakedan 0]

All you can do is mixture .

One last question. The Weber carb has come with a 125 main jet, the standard carb from a 1300 is a 122 main jet. Should I stick with the Weber 125 or fit a 122 main jet?

[sheffieldcortinacentre 767]

Try it as is, it's not a big job to swap over later.

[pancakedan 0]

Thanks

[teletubby 7]

Let me know if you want to sell the original carb after fitting the Weber

[pancakedan 0]

I'll probably end up keeping it just in case I have an issue with the Weber or decide to take it back to factory spec at some point. But if I do, I'll let you know.