Piston ring gap specifications?

[Jon K]

Top Comp Ring:
End clearance: 0.008-0.016" or 0.2-0.4mm
Side clearance: 0.0008-0.0020" or 0.02-0.052mm

Bottom Comp Ring:
End clearance: 0.008-0.016" or 0.2-0.4mm
Side clearance: 0.0008-0.0020" or 0.02-0.052mm

Oil Control Ring:
End clearance: 0.008-0.018" or 0.2-0.45mm
Side clearance: 0.0008-0.0022" or 0.02-0.055mm

Thanks to Dave M via PM. Thats all I wanted. Have a nice day guys.

[ironie]

I gave you the same numbers.
You are welcome

[Jon K]

I gave you the same numbers.
You are welcome

Your stuff said 0.01 - 0.04mm versus Dave 0.1 and 0.4mm big difference

Thank you though

[ironie]

My appologies, I misread you

you had better check up on that big difference, I also listed you all availiable stock ring sets for overbores as well

[Jon K]

My appologies, I misread you

you had better check up on that big difference, I also listed you all availiable stock ring sets for overbores as well

I am very much glad you editted your original post. I won't post your original response (though the name calling was cute), I can read, and you posted 0.01 - 0.04mm which is:

0.0003 - 0.0015", which is very different from 0.008 - 0.015"... and like I said, this is why I don't use google to try and find measurements down to the thousandths of an inch.

Thanks anyway for trying to get the figures

[ironie]

I didn't try. if you look at the availiable piston rings availiable you will see I am right, But you could always prove me wrong by using the wrong number, Not all of what I retracted was unappropriate.
It may have just been mistimed
Have a pleasant day

[Jon K]

I didn't try. if you look at the availiable piston rings availiable you will see I am right, But you could always prove me wrong by using the wrong number, Not all of what I retracted was unappropriate.
It may have just been mistimed
Have a pleasant day

You told me to gap my rings 0.0003 - 0.0015"

Correct as per BMW TIS (what i wanted) is 0.008 - 0.015"

That is a very big error...

Especially when I am doing math from the stock numbers to open up the gap for nitrous/turbo. I would have been 10 times too small of a gap!

[ironie]

fruggit

[Jon K]

Maybe I have forgotten how to count, but 3.98 +.02 equals the size of the bore. Your gap is .02 But then again, I do it every day professionaly

The fact you don't know or seem to understand, shows you shouldn't even be considering changing it

Sigh.

Have a nice day.

This isn't the first time I've built an engine - it's the first time I've built an M50 and I want the RIGHT numbers.

What are you talking about 3.98 + 0.02? I think you mean 83.98 + 0.02 yes that takes up my bore. However, I don't know why you're finding the difference between it and the bore. Applications have different gap. I am actually going to be slightly larger than the standard bore/gap because of nitrous and turbocharging. The diameter of the bore is sort of proportional to the gap, but that doesn't mean you just gap a ring 0.02mm because your total bore size is 84mm. It's going to expand more with the application I am using. Trust me - go to CP pistons webpage and look up their information. You will see the figures you're supplying are 10x off.

[Macv]

I didn't try. if you look at the availiable piston rings availiable you will see I am right, But you could always prove me wrong by using the wrong number, Not all of what I retracted was unappropriate.
It may have just been mistimed
Have a pleasant day

Why are you fighting? Swallow your pride if you have to and just let the thread die.