Originally Posted by
TomB
Roelof, how, and in what directions do you do these grooves? are the 3 small groves towards the exhaust port?
The advise of Mr. Singh was 3 grooves with one above the exhaust port.
This was my first attempt and was to quick with the dremel so I started with a small groove out of line. To make it good I made the right groove and another small one, This part is indeed above the exhaust port.
This is how it is supposed to be:
Using 2 smaller grooves is done more:
http://somender-singh.com/component/...d,384/catid,2/
Just make a few, to many will effect the working of the squishband and does need to compromise the compression.
Originally Posted by
stefan
Hi Roelof,
I think the info you are giving here is a bit too general and could lead people to mess up their engines.
First of all, you have to find out the timing of a crank, before you can decide how to modify it.
Oh yes, you are right, thats why only some tenths of a mm, that room is always there in a non-modified engine and does make noticeable changes in the performance.
By the way this is another interesting site:
http://www.first-racing.eu/html/steuerzeiten.html