2056 Build Options

[SteveNMaine]

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?

[Jack Standz]

Jack, I am the TECHNICALninja...

I earned that name and did not choose it myself.

That was compression calculations 101!

You know this; you're serious too...

Do you disagree with what I posted?

If you don't take everything into consideration, you're not doing it correctly!

Thank God he's using flat tops.

Imagine the difficulty with an exotic shaped piston crown.

That is where I've used the clay before.

And, yep, during a build, speed is not a factor.

I seldom have to go back "in" however...

I want to do it exactly right ONE SINGLE TIME!


And I use the alcohol BECAUSE of the fast, clean evaporative qualities.

Every AC system I flush is finished with alcohol as to guarantee nothing is in the system when I pull a vacuum.

A single drop of the other AC flushing chemicals will kill a new system.

I call this "medically clean"- not even germs...

Yes, we are both serious about this stuff. And I don't disagree with your post, except maybe the minor criticism you had about using colored alcohol to check combustion chamber volume (this has the added quality of confirming if your valves are sealing well, as I think alcoholwill leak past a valve easier than coolant) (IMG:style_emoticons/default/smile.gif) . So, if you see leaks/drips into the ports, your valves need some more work.

We've used play dough to check piston to valve clearance. It gives a nice visual check on the clearance and when you carefully measure the thickness at the closest point of valve to piston contact, it will confirm/not confirm other calculations or measurements.

On Type IV motors you really don't want to go back in there, especially if it involves splitting the case. It's a messy process and cleaning the case and re-gluing it back together is never part of the plan. And not getting things right the first time can be really expensive. Time (redoing things, sourcing parts), machining, parts, broken parts, etc.

Plan the build well, measure, clean, mock things up multiple times, etc, etc. and execute well. Or something like that.