M series stroker

Hi another of my odd questions. Reading on the internet it appears that the main difference between the 1.3 and the 1.6 is the crank throw at least for displacement. I know it would be a lot of work but if for instance the motor was already apart is it possible to do a crank swap or is it more complex than it sounds? Yes I know it would be a lot easier to get a 1.6 and replace it whole but what fun is that?

Also, and this is a lot of work, is it possible to get the additional 5mm diameter out of the cylinders of a 1.6 to get up to 1.8 or indeed beyond that?

As a minimum you would have to replace/swap the pistons ( if they are interchangeable) as the extra throw on the crank would drive the pistons into the head.

Lambert wrote: Also, and this is a lot of work, is it possible to get the additional 5mm diameter out of the cylinders of a 1.6 to get up to 1.8 or indeed beyond that?

If getting to 1.8 is possible i think that would be interesting.. You could also get a high compression 1.8 as most european m16a have 11.1 CR and the 1.8 has 9.5 CR.

However the M16 do have a higher cylinder block and i guess more crank throw than the M13 so i guess the M16 is already maxed out except for the bore.
There is also a M15 sport engine and that could possibly be a M13 with more crank throw..

Cost compared to what you get is of course way beyond reason wich makes it kind of fun to do i guess.

I looked into all this before doing a 1.6 swap and it is indeed much easier to just swap the engines. The 1.6 engine is a stroked 1.3 with a taller block. To achieve the same in the 1.3 block you would need custom pistons and if you are going to that much effort why penalise yourself by using the block with least potential? Spend the money on bike throttle bodies for the 1.6 instead...

Hmmm. I think I could have a plan forming here. A 1.6 bored to 1.8, with forged internals and some induction assistance. Like you say Busta 1.6s are quite cheap as a base and put the money into the guts of it. A gearbox eater.