A question about compression ratios...

If I ever do a rebuild, it will be with higher compression pistons. Works great with a cam thats made for it (overlap) as said before.
Ive done just piston mods on gasser motors without changing anything else and it screws up the power curve. Great for burning up tires thats about it.
 
rightwinger said:
the pistons were stock pistons that were milled down, this is probably where such high CR came from.
Click to expand...

milling down pistons raises the compression? I would think that the more metal you take off the less compression you would have but I am still learning.

I am having valve reliefs cut in my pistons and I am thinking that this is going to lower the compression.
 
You are making the bowl smaller when milling the tops and that would raise compression. Removing material from the existing piston top for valve reliefs and leaving the rest untouched with stock piston protrusion would lower compression.
 
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