Bit of advise please...

[Paddy]

Hi folks I've been ducking and diving through the forum since I recently acquired my micra and have read a few threads recommending fitting 1.0 pistons to the 1.3 engine for more power by increasing the compression ratio. I'm assuming that the crank in the 1.3 has a longer stroke and has shorter piston arms than the 1.0. Is this the case? I know most things on the micra is interchangeable so is it just a strait swap and what do I stand to gain? Also I had a few mil skimmed off the head so will this be a problem when fitting the 1.0 pistons. Any input would be much appreciated and thanks in advance.

 

[frank]

yes paddy, a longer stroke and shorter rods, but the gudgeon pins are an interference fit and have to be pressed out tho
you end up with a C/R of about 12:1 (similar to a 2mm headskim)
and going by mine it makes the engine more efficient (i,m getting surprisingly good fuel milage)

 

[baguete]

Yes, a modded Micra engine gives more MPG (with sense driving)...

 

[Paddy]

So will it be fine to fit the pistons along with the skimmed head? Will there be enough clearance? I've got a 1l engine lying doing nothing that I was gonna sell so might as well use it as a donor.

 

[frank]

So will it be fine to fit the pistons along with the skimmed head? Will there be enough clearance? I've got a 1l engine lying doing nothing that I was gonna sell so might as well use it as a donor.

it depends how much was skimmed off paddy, its more a det problem than a contact problem (especially with stock cams)

 

[Paddy]

it depends how much was skimmed off paddy, its more a det problem than a contact problem (especially with stock cams)

I see, well suppose its trial and error at this stage then. Think I'll give it a go anyway, I can always use the head off the 1l with the 1.3 cams if I have any problems. Or do you reckon I won't really gain anything from replacing the pistons that I haven't already from the skim? Thanks Frank

Off topic but how do you thank people's posts?

 

[Guy]

Tick the thanks thing under the user's post .

 

[Paddy]

Never had the thanks option till today for some reason