4A-GE engine mix - question

[Uzelac]

3to5 valve job for a 16V head from a friendly machine shop is ~150€.
How much is it in B/NL ?

If you need anything, i have friends coming from germany/france pretty often, just let me know

[Uzelac]

Bean Bandit Wrote:You could order them from abroad. Maybe someone with a TRD kit can measure his, then you would know if they are the same or not
Better to measure exactly though as ~ doesn't exist in engineering

Thicknes is different from shim to shim.
~in diamater means cant-remember-right-now-but-have-it-written-somewhere-or-i-can-eaisly-measure-again

[Project D]

13mm shims are easier to find than mine (8mm / supertech)

for exemple:
http://www.phatperformanceparts.com/K_L_...9-2600.htm

[Uzelac]

This is great .
Best info in your post is that some Kawasaki's use them.
If that's correct, then the problem with shims is as good as solved .

[NoHachi]

http://www.precisionshims.com.au

[Project D]

Yes Kawasaki use 13mm shim, that why I says they are more common

(if only supertech have used 7.5 shim like many many Honda / Yamaha bikes rather than 8mm )

NoHachi, http://www.precisionshims.com.au make 8mm shim ok, but no price on their website...

[oldeskewltoy]

Wow... lots going on in here........


You can machine the keeper end of the valve some to gain back what is lost. Personally I wouldn't sink the valves... too much overall cost.

FACT: ALL 16V 4AGES, large port and small port begin life (stock unshaved) between 36, and 36.25 cc To get an unported head down to 32cc that head would have to been cut very deep




I have opened up a head once before. From 36cc to nearly 39cc - note the 2 chambers on the left, compare those to the 2 on the right. The 2 on the right now measure nearly 39cc each




here is a shot showing before and after on one chamber




Finally, the changes by the numbers - note the squish areas have only changed minimally at most



Another area to "tune" your compression.... Are your Wiseco pistons pointed? You can usually have some of that pointed amount removed - have you machinist check, by as much as 2mm of the crown center can be machined away, this is another option in lowering static CR

[NoHachi]

Quote:Personally I wouldn't sink the valves... too much overall cost.

How do you reckon?

[oldeskewltoy]

NoHachi Wrote:

Quote:Personally I wouldn't sink the valves... too much overall cost.

How do you reckon?

1) re machining all the seats,

2) tipping the tops of all the valves to keep a protrusion around 37.5mm - http://i79.photobucket.com/albums/j143/o...rusion.jpg

3) blending the lowered seat and the combustion chamber to provide proper flow over the drawn in seat

I just think it is easier to open the chambers, then it is to sink the valves further.

[Uzelac]

Wisecos are very pointed, maybe i could gain another 1ccm only on them . I'm kind of affraid to widen the chamber, area between them looks thin enough already.
Deshrouding valve seats, removing casting marks and cutting down the pistons sounds promising enough, maybe even 3ccm .

btw. what do you reckon, how much skimming head can sustain before it becomes junk? 1.5mm, 2mm, more?
Of course, any head can have valves sinked more and chamber enlarged, but if all that is needed, it sounds too me other head is much better option.
How much is too much to have descent squish with average 1-1.2 mm headgasket?