TheSamba.com :: View topic - Type 4 stroker build , connecting rod length etcetera.

Tue Jul 10, 2012 2:27 pm

I would like to build a 2.3 liter type 4 engine using a 78 mm crank and 96mm pistons. I want to build it as big as possible without greatly effecting it's longevity or not being able to let it idle in the hottest weather.

First question is about finding a good source for parts. I can only find a few links myself.

Second questions is I don't see any kits that take the piston, cylinders, rods in consideration with a stroker crankshaft. With the stock rod length I would most likely hit the head with the piston or hit the crank with the piston at the other end.

Third question is how does camshaft and rod length work together. Basically I want to start making power at 1500 rpms like a V8 would with a 266-268 advertised duration cam.

Forth question is how hard is it to convert to a hydraulic camshaft?

I prefer short stroke engines but if I have to stroke it to get more power over all I'm fine with it and here are a couple of observations.

1- This 1.7 engine supposedly has connecting rods that are 127 mm long with a stroke of 66 which gives a rod ratio of 1.97 which is pretty high.

2-The stock valve sizes for the 1.7 is rather small and from looking at the amount of material around the ports I'm not surprised that stock VW heads have cracking issues.So If rod ratio has any credence keeping it high theoretically wound be better with the limitations to the heads poor breathing to move/keep the rpm band up.

So what do you think? :shock: