Lads,

 

Please help me out. Currently I'm running a bikecarb, megaJolt setup along with a few other mods. I did about 10K miles and I thought this it ain't bad apart from gearbox going all time.
So I thought i'd park it up and have a stronger gearbox built and also build a new engine based on the same design as it worked.

 

Anyway I bought a AFH engine a year ago, along with some schrick cams, H-beam rods with right fitting bearings, piston, pinion etc. I am having the head ported and basically I am good to go.

 

The carbs were slightly overfueling therefore I thought with all these new mods it's going to balance it out all right.

Anyway over the years I have been reading if you swap JUST the crankshaft with a 1.6 engine it will give me in effect a 1.6 engine with approx 20BHP gain.
Now here is my dilemma. I have ragged plenty of 1.4AFH engines and they seem bullet proof to me. Is this due to the SHORTER Stroke?

Has anyone failed a 1.6 conversion? I wonder what effect the longer stroke has on the :

 

1) cylinder ring wear. 
2) Oil level,
3) oil level splish splash.
4) the rods

 

More of an engineering question .

 

 

 

 

Arrival:

 

 

Clean up:

 

 

Piston/Rod measurements

 

 

Rod change:

 

 

Springs:

 

 

*Stick to originals. I'm sure they have stronger spring in them. Plus what a rip for the aftermarket ones
I'll probably be crying for saying that later down the line. Good thing about them is their wider.

 

 

Valves:

 

 

*Problem: Cannot find original valves anywhere. The orignal Inlets have better airflow than aftermarket ones.
The exhaust ones are all the same. Would VW help me on this one I wonder.

Edited 25 June, 20179 yr by damunk

H-beams - should take any abuse.

 

You could always get the valves back cut to 30 to 32 degrees if their weight matters for high revs.

Thanks. Think the dream of 1.6 is dead. Needed longer rod and different piston I believe.

Oh well. Will stick with 1.4 :) 

love watching a motor being built, keep it 1.4 and make it scream