Maximum Allowable Variance in Deck Height, Stock 2.0 Liter Four Options

[motorvated]

I'm in the process of re-assembling the top end of my stock 2.0 liter four, and I have measured deck heights as follows:
#1 - 0.036
#2 - 0.029
#3 - 0.037
#4 - 0.035

These measurements are with the cylinder base sealing rings in place and the cylinders torqued down snugly and measured with a dial gauge. To me it seems as if I need to add a shim to the bottom of cylinder #2 approx. 0.050 - 0.080 to increase its deck height to within the range of the others. I have a couple of used 0.080 shims, one of which I could add to cylinder #2 to bring it up to 0.037.

I have a couple of questions about this.

First, how much variance is permissible between the measurements? If the deck heights are all within 0.002 of one another, is that Ok or do they need to be exactly the same.

Second, can I re-use one of my 0.080 shims or should I source a new one.

And third, do I place the shim on top of the cylinder sealing ring, beneath it, or doesn't it matter. I was planning on putting it on top of the sealing ring.

Thanks in advance for your advice.

[914werke]

That's the one I have but it also has a plate that drops in between and is keyed to the half circle cut outs you see on the bars. (IMG:style_emoticons/default/smile.gif)

Hmmm I didnt get that ? Mark can you post a pic I might have to make one.

[Mark Henry]

That's the one I have but it also has a plate that drops in between and is keyed to the half circle cut outs you see on the bars. (IMG:style_emoticons/default/smile.gif)

Hmmm I didnt get that ? Mark can you post a pic I might have to make one.

Yes that's what I have.
I tried to post some pics last night, but win10 was getting stuck downloading from the SD card. I need to get a hardwired wifi router out in my shop.

[stownsen914]

Great information on this thread …

I hope I'm not highjacking to ask a related question. How high can you get the compression ratio on a type 4 with flat top pistons? I understand people cut the heads to bump it up a bit. What if you want high compression, like, say 11:1? Domed pistons I guess?

Scott

[Mark Henry]

Great information on this thread …

I hope I'm not highjacking to ask a related question. How high can you get the compression ratio on a type 4 with flat top pistons? I understand people cut the heads to bump it up a bit. What if you want high compression, like, say 11:1? Domed pistons I guess?

Scott

Why 11:1?

Fly cutting is the easiest, you can surface the head fin for more clearance, some remove a fin, other builders have welded the chambers making them smaller.

I don't know if domed T4 piston are available, maybe custom order from JE. You could make you own "dome" if you have the deck to play with, but I can't see getting more than .5cc doing this.