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> 2056 Build
SteveNMaine
post Dec 2 2024, 08:17 AM
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I am trying to work out compression ratio of my 2056 build. In calculating head volume my understanding from the forum is that stock 2.0 heads have 57mm and the valve pockets on the pistons I am going to use is 3mm. Do I add these together to use 60mm in my calculations for head volume?
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technicalninja
post Dec 3 2024, 05:42 PM
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@porschetub The .028 on the top of the piston is negative deck height, correct?

Did you use a fire ring?

If so, how thick?

If not, .028 is 4 thousands CLOSER than anything I've ever run across or built.
I have built a tight bore, cast piston water pumper at .033-.034.
It worked fine but I was nervous about lack of clearance.

.028 sets a new "low" for me...

@emerygt350 OMG are you right! You take off too much on a water pumper there are only two ways to save it.
Thicker head gasket (if someone makes it!!!)
Replace block (and do ALL of the block machine work again!!!).

I do my WP builds WITHOUT decking the block.
Get everything perfect before pulling it back down for the decking.

I also let the machine shop know that if they take more than I ask for they will get to purchase and machine another block for me!

I'll also pay DOUBLE for the extra precision!
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SteveNMaine   2056 Build   Dec 2 2024, 08:17 AM
Geezer914   Yes, anything that adds volume.   Dec 2 2024, 09:25 AM
technicalninja   You should measure the valve depressions, head CCs...   Dec 2 2024, 09:50 AM
rfinegan   IM doing this too.. This may help https://www.yout...   Dec 2 2024, 12:31 PM
technicalninja   Another tip is to reduce the surface tension of th...   Dec 2 2024, 12:56 PM
barefoot   My understanding is that 2L heads are 60 cc and 1,...   Dec 2 2024, 06:40 PM
Jack Standz   I am trying to work out compression ratio of my 2...   Dec 2 2024, 10:41 PM
emerygt350   I used my kids crayon clay and compared it to oil,...   Dec 3 2024, 06:25 AM
930cabman   I am trying to work out compression ratio of my 2...   Dec 3 2024, 10:59 AM
technicalninja   [quote name='SteveNMaine' post='3179889' date='De...   Dec 3 2024, 12:16 PM
porschetub   Did all that when I did my last build for a custom...   Dec 3 2024, 04:15 PM
emerygt350   Well spent time. And on a type 4 it's some pre...   Dec 3 2024, 04:55 PM
technicalninja   @porschetub The .028 on the top of the piston is...   Dec 3 2024, 05:42 PM
porschetub   @[url=http://www.914world.com/bbs2/index.php?show...   Dec 7 2024, 01:28 PM
Jack Standz   [quote name='SteveNMaine' post='3179889' date='D...   Dec 4 2024, 02:17 PM
technicalninja   Jack, I am the TECHNICALninja... I earned that na...   Dec 4 2024, 04:27 PM
Geezer914   Deck height should be around 0.040, if less, check...   Dec 5 2024, 09:30 AM
Jack Standz   Jack, I am the TECHNICALninja... I earned that n...   Dec 5 2024, 10:06 AM


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