Big Valve 1.6 Head

[truckinwagen]

good lord!

anyone know at what point the valves start getting shrouded by the cylinder wall?
and also, do the runners on the 1.6 head have enough flow to support such big valves? I have always thought that the sharp turn at the valve bowl was the big flow restriction, not the factory valve size.

not to say that bigger valves would not help, but I wonder what the point of diminishing returns is...

-Owen

[Smokey Eddy]

Same with the AAZ's Owen. when i ported my head i noticed it choked up incredibly at the 90 degree turn. Very worth noting.

[Aki-76]

http://s434.photobucket.com/albums/qq68/Aki-76/moottorin%20osia/?action=view&current=03042010812.jpg

41mm in / 35mm ex

ceramic coated,off course  

My new engine is 80.5mm bore,next engine is 81.5 or more.(mayby more = )

Thats true,big valve isnt all ways better than orginal.Orginal bore (aaz/1Y) best size is somethink 38-39mm in and 33 ex.

This head i run dyno 0.6 bar boost 218hp in wheel.

[UnderPSI]

What head did you use for that?

[MJF]

Itīs 1,9 head.

[UnderPSI]

A 1.9 head must have wider valve spacing than a 1.6.

[UnderPSI]

Almost done, don't think you can go any bigger in a 1.6 head.

[Smokey Eddy]

MJF's godly cylinder head...
I wish i could see UnderPSI's photos but i can't at work!