what deck height with AA 96mm pistons

[fasty67]

I'm wondering what deck height other people are getting with AA's 96mm p/c kits. I got about .071 and someone else here got around .075. Is this too much to run. I want to get this engine together. Will this likely cause incomplete burn. Is anyone running with this much deck? What kind of success/horror stories?

[mike373]

No two engines are gunna give the same deck height. Too many vaiables involved...machine work, variance in part tolerances, etc. Get your machine work done to make the deck height what YOU want it to be. What compression ratio are you shooting for?? What is the volume of your heads??? Etc etc??

Mike

[fasty67]

So to answer my own question. I was reading in my Automotive Technology text book... when replacement pistons are made for engines they are automatically destroked .020 (or so depending on application). This is to make up for the difference from the machine work that is associated with rebuilding and engine. This balances the increase in CR caused by the machine work to a block and or head. So in another post someone stated there was a 2mm cylinder length increase in the AA 96 mm cylinders. Well makes sence. If on a block with cast in cylinders and you deck the block and or the head(s) it increases CR. But on the replacable cylinder engine it makes sense to make up for machine work in the heads and the case by lengthening the cylinders vs. destroking the pistons to keep the engine the same width for the rngine sheet metal and exhaust.
I feel so smart now
This website and its members, Tuna's sites, Jakes Sites, Thanks so much for providing great resources and infomation. I could not have got this far with out all of this
I don't know if this will help anyone. I just always have automotive theory on the brain and can't keep it to myself today.

[theKbStockpiler]

The example that you are using for a basis is most likely for a non performance factory replacement piston and has little practical applicational value.Piston catalogs ; if you can access one, will give all the dimensions of a Piston, ask a machine shop. There you can compare the Compression Hight : I believe it is called, yourself.A bigger bore with everything else being the same would result in a higher static CR. With the AA piston example a (stroker piston) has wrist pin location has been moved up towards the oil ring if not into it ,to make the Piston shorter so it won't hit the head with the increased stroke. AA is making the piston shorter anyway so there is no reason to subtract it from the Compresson Hight. A longer piston is almost exactly like having a longer rod. The actual measurement , like 2 inches from the block to 5 inches as measured from the block ;if your engine has a stroke of 3 inches, is the SPECIFIC area that the crankshaft is displacing the (piston through) as coordinates on a map. AA is most likely taking CR into account but not nessarily with how long the piston is from the top ; not including the dome or dish, to the bottom of the skirt. Some how there has to be more dead area at the top of the pistons stroke if the actual stroke is increased to keep the static CR the same as before.