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Different Deck Heights
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i_luv_my_bus76
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PostPosted: Sat Jan 19, 2019 6:05 pm    Post subject: Different Deck Heights Reply with quote

I just checked the deck height on all 4 cylinders

1& 2 are .035
3&4 are .039

I can live with .039 but I'm a little concerned with the .035

Should I be concerned or has anyone else ran the deck that close
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mcmscott
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PostPosted: Sat Jan 19, 2019 6:12 pm    Post subject: Re: Different Deck Heights Reply with quote

Trim 1-2 then rebalance
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i_luv_my_bus76
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PostPosted: Sat Jan 19, 2019 6:19 pm    Post subject: Re: Different Deck Heights Reply with quote

mcmscott wrote:
Trim 1-2 then rebalance


If I trim 1&2 won't that bring the deck closer?
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Vanillagurilla
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PostPosted: Sat Jan 19, 2019 6:23 pm    Post subject: Re: Different Deck Heights Reply with quote

Lol yeah you can trim the other side or shim up the close side.
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PostPosted: Sat Jan 19, 2019 6:27 pm    Post subject: Re: Different Deck Heights Reply with quote

I think he was taking about the pistons. Bit that seems like a lot of work unless this is a race engine.

Just shim them out where you feel comfortable. Maybe .01?
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PostPosted: Sat Jan 19, 2019 6:27 pm    Post subject: Re: Different Deck Heights Reply with quote

Put an .004 cylinder shim under 1&2.
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i_luv_my_bus76
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PostPosted: Sat Jan 19, 2019 6:34 pm    Post subject: Re: Different Deck Heights Reply with quote

Howard 111 wrote:
Put an .004 cylinder shim under 1&2.


The thinnest shim I can find is .01, is there a place that makes custom shims

If I shim them both at .01 it will throw my compression ratio off
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i_luv_my_bus76
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PostPosted: Sat Jan 19, 2019 6:36 pm    Post subject: Re: Different Deck Heights Reply with quote

Pruneman99 wrote:
I think he was taking about the pistons. Bit that seems like a lot of work unless this is a race engine.

Just shim them out where you feel comfortable. Maybe .01?


It's an engine for my daily driver

I'm building a 1955cc

If I shim both sides I will knock my compression ratio off...I'm shooting for 9:1...with .039 I'm right there
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rugblaster
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PostPosted: Sat Jan 19, 2019 6:52 pm    Post subject: Re: Different Deck Heights Reply with quote

how thick is a paper gasket?
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i_luv_my_bus76
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PostPosted: Sat Jan 19, 2019 6:59 pm    Post subject: Re: Different Deck Heights Reply with quote

rugblaster wrote:
how thick is a paper gasket?


Good question, never thought of that! I'll measure when I get home!

I've always tossed those things aside...i probably have 50 of them sitting around somewhere in a box since i never throw anything away
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PostPosted: Sun Jan 20, 2019 1:05 am    Post subject: Re: Different Deck Heights Reply with quote

i_luv_my_bus76 wrote:
rugblaster wrote:
how thick is a paper gasket?


Good question, never thought of that! I'll measure when I get home!

I've always tossed those things aside...i probably have 50 of them sitting around somewhere in a box since i never throw anything away


Genius!

But if that doesn't work, I would turn down the cylinders quite a bit, so you can use thicker shims. If you get a full set, no two really match, so you mix & match until you get the deck you want.
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PostPosted: Sun Jan 20, 2019 4:55 am    Post subject: Re: Different Deck Heights Reply with quote

FreeBug wrote:
i_luv_my_bus76 wrote:
rugblaster wrote:
how thick is a paper gasket?


Good question, never thought of that! I'll measure when I get home!

I've always tossed those things aside...i probably have 50 of them sitting around somewhere in a box since i never throw anything away


Genius!

But if that doesn't work, I would turn down the cylinders quite a bit, so you can use thicker shims. If you get a full set, no two really match, so you mix & match until you get the deck you want.

Never use papewr gaskets! Even copper gaskets are dubius.
In your case either trim 2 pistons and rebalance, or machine the cylkinders to accomodate a 0,5 mm shim or similar would be the way.

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PostPosted: Sun Jan 20, 2019 6:44 am    Post subject: Re: Different Deck Heights Reply with quote

I had the same problem, cut the pistons and re-balanced. I checked the gaskets I had, they were .005 before I threw them in the trash.
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PostPosted: Sun Jan 20, 2019 7:05 am    Post subject: Re: Different Deck Heights Reply with quote

paper gaskets are just one more thing to go wrong....have you cc'd the heads? cause if they're not new and have been flycut before one side could have larger chambers than the other....then you may be able to put a .010 under all 4....i personally wouldnt run 9 to 1 on the street but its your car....
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PostPosted: Sun Jan 20, 2019 7:39 am    Post subject: Re: Different Deck Heights Reply with quote

volksworld wrote:
paper gaskets are just one more thing to go wrong....have you cc'd the heads? cause if they're not new and have been flycut before one side could have larger chambers than the other....then you may be able to put a .010 under all 4....i personally wouldnt run 9 to 1 on the street but its your car....


The heads are new...dual port big valve, single high rev springs, cc'd to 55.

Why wouldn't you run 9 to 1? What compression is the highest compression you feel comfortable running on the street?
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PostPosted: Sun Jan 20, 2019 8:43 am    Post subject: Re: Different Deck Heights Reply with quote

If it's balanced already, trim the cylinders and get shims to sort it. If it's not balanced, trimming the pistons would be my choice.
No need to make more work if you don't need to
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PostPosted: Sun Jan 20, 2019 9:13 am    Post subject: Re: Different Deck Heights Reply with quote

I don't have a machine shop in my garage, I have to pay to have it done.

The best solution would be trim .004" off 1&2 pistons then rebalance all 4. That would give you .039" deck height across all 4 cylinders.

If it were my engine I would put a .010" shim under the barrels and build it. Worrying about 8.9 or 9.0 compression won't make a bit of difference on a street engine and is just plain being anal.
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PostPosted: Sun Jan 20, 2019 12:22 pm    Post subject: Re: Different Deck Heights Reply with quote

eazy put them all at .035, mine are .034 seems to work just fine.
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PostPosted: Sun Jan 20, 2019 12:37 pm    Post subject: Re: Different Deck Heights Reply with quote

I am old enough to have had the opportunity to have repaired original VW air-cooled engines from the factory. (virgin engines, if you will) They all had paper gaskets on the cylinders. I also remember using a single edge razor blade to physically remove the paper gaskets. They were stuck pretty good. Paper gaskets are still used in some instances, not just VW cylinders. It is just easier to slop some RTV on the cylinder base and slap in on. You actually have to pay attention when using the paper and that is difficult for some people
to grasp. In certain circumstances, paper would be a viable choice.
Also, with larger cylinders, the paper gaskets choice is mute anyway.
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i_luv_my_bus76
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PostPosted: Mon Jan 21, 2019 11:14 am    Post subject: Re: Different Deck Heights Reply with quote

vwracerdave wrote:
I don't have a machine shop in my garage, I have to pay to have it done.

The best solution would be trim .004" off 1&2 pistons then rebalance all 4. That would give you .039" deck height across all 4 cylinders.

If it were my engine I would put a .010" shim under the barrels and build it. Worrying about 8.9 or 9.0 compression won't make a bit of difference on a street engine and is just plain being anal.


Can I get some clarification...if it were your engine would you trim then shim with a .010...or just shim with a .010
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