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Archives of Posts to the NZ MX5 List back in 2000
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Fletcher Blades

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Post by Fletcher Blades » Tue Feb 01, 2000 6:41 pm

Hmmm... I just tried and the page was un-available... ?

The pistons will be a bigger bore (ie, diameter), sou you'd need to remove
th engine and get the cylenders enlarged. You'd also need piston rings
(which would probably come with the pistons?).

That is all you would NEED to replace, but there is a whole lot more that it
would be adviseable to change while you were in there... bearings, and
other wear items...

Increasing the capacity also raises the compression ratio (in this case,
from 9 to 9.7), so thats good for power too. You wouldnt actually get enough
power to make it worth doing, unless you upgraded other items at the same
time, like cams, computer, etc. But these are not strictly necessary.

2 liters is only 9% bigger than 1839, so with that, and the compression
ratio, you might be looking at 12-15% increase? And by the time you've got
the pistons in, you could be looking at $2000 or more.

The good thing about both increasing the capacity and the CR is that they
apply over the whole rev-range, so you get better city-driving torque, not
just top-end power that most easy mods give...

Fletch.

zorruno
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things

Post by zorruno » Wed Feb 02, 2000 9:40 am

sorry - try http://www.justmx5.com

thanks for the info - seems a lot of work. I didn't realise that a bore was
necessary - I thought the pistons just increased the stroke to give the
desired displacement.

[...]
(z)

Fletcher Blades

things

Post by Fletcher Blades » Wed Feb 02, 2000 6:55 pm

Howard,

Thanks for the new URL...

Pistons can only have a different bore, and/or compression ratio...

To increase stroke, you need a "stroker" crank. Then, if you get a stroker
crank, you need new pistons to lower the compression ratio, as, with the
pistons now going up and down further, you need lower profile pistons so
they dont bang into the head. ...

Fletch.

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