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Posted by: simonjb Aug 11 2020, 09:23 PM

Forgiven me if a stupid q....

I am re-building my 1974 2.0 and following the manuals and Raby video. As I measure the deck height, I am too close - about .15”

I have some spacers, but it appears they only fit correctly on the head side and not on the case side of the barrel. They are too small if I try to install between the barrel and the case. I am using AA pistons and 96 size

Is it ok to add the spacers on top of the barrel instead of below to add the necessary height?

Posted by: iankarr Aug 11 2020, 09:31 PM

The general consensus is no. Whether or not head "gaskets" shold be used at all is a topic of debate. Google it and you'll see. They definitely make cylinder barrel "shims" in a variety of sizes. Doesn't matter if the jugs are 94mm or 96mm...if they fit properly in the case, the shims will work. And that's about as much engine advice as I'm qualified to give .

How are you measuring the deck height? Are you using a specific tool? dial gauge? I'm sure if you post a pic of your setup, the engine gurus can offer more insight.

Posted by: iankarr Aug 11 2020, 09:36 PM

Here's a link to EMW's site for shims...

http://www.europeanmotorworks.com/vw/type-4-shims.html

Posted by: Superhawk996 Aug 12 2020, 07:28 AM

@http://www.914world.com/bbs2/index.php?showuser=20505
Need clarification. 0.15" is not too close. That is a lot of deck height.

0.15mm on the other hand is way to little.

Deck hight sould be in neighborhood of 0.040" Forty thousands of an inch or about 1mm.

0.15" of deck hight is beyond TRIPLE that minimum deck height of 0.040"

Posted by: Superhawk996 Aug 12 2020, 08:42 AM

Need clarification. 0.15" is not too close. That is a lot of deck height.

0.15mm on the other hand is way to little.

Deck hight sould be in neighborhood of 0.040" Minimum. Forty thousands of an inch or about 1mm. Maximum is more like 0.060" unless you've got something unusual going on to manage compression ratio.

0.15" of deck hight is beyond TRIPLE that minimum deck height of 0.040"

Posted by: simonjb Aug 12 2020, 11:10 AM

sorry...I meant .015 !!!!! Thanks....

Posted by: iankarr Aug 12 2020, 11:19 AM

Easier to have less than more, for sure.

Since I've now been through two 2056 builds with AA pistons and jugs where the deck height out of the box is over .070, I'm wondering if maybe you got a new (better) set of castings...or if the rig you're using to measure is giving different readings. How exactly are you measuring DH?

Posted by: jsaum Aug 12 2020, 03:20 PM

How did you adjust the deck height for .070?

Posted by: iankarr Aug 12 2020, 03:52 PM

That’s just the way it came up with the AA pistons. When I switched to KB pistons the deck height (with no shims) measured a much more normal .030

Posted by: simonjb Aug 12 2020, 06:46 PM

So I tried again tonight and also installed the stock sealing ring between the barrel and the case. I tightened down the barrel and then turned the crank to get TDC. First one was .033. I did it again on another and got .034. The method I used was a straight edge solid metal bar across the barrel top and then used detached feeler gauges to slide under the bar until there was no resistance.

Posted by: type2man Aug 12 2020, 06:55 PM

European motor works has what you need. Or you could try calling Raby since he made the video. He should have tech support. Call him.

Posted by: wndsrfr Aug 12 2020, 07:02 PM

When you do order the shims, my advice from experience is to get two sets. Measure them after removing the burr on the inner edge from the stamping process. I found a significant variation within one pack so had to take one from the other pack to get four of the same thickness.

Posted by: porschetub Aug 12 2020, 07:36 PM

Wise words,however the OP hasn't mentioned a target compression ratio ?,didn't someone mention the AA barrels are too long to get correct deck height and require machining @ the case register ??.
You can do head gasket delete if you so desire but heads need to be flycut for that so the seal is 100% and only if the barrel heights are equal and no erosion of the case registers.
Good luck.