Piston ring end gap F engine (1 Viewer)

[flee]

I'm on my first F engine rebuild and have a question about ring gaps.
The book spec seems to be on the small side so I'm asking what people have found to be the optimum.
TIA.

 

[B y r o n]

If you don't like what Toyota has to say then maybe this will help.

 

[flee]

If you don't like what Toyota has to say then maybe this will help.

Thanks, good info. I was questioning the low side of the book values. I'm going to set the gaps to the higher end of Toyota's range.

 

[B y r o n]

You might what to start at lower end as the gap will increase as the cylinders wear and performance will suffer.

 

[flee]

You might what to start at lower end as the gap will increase as the cylinders wear and performance will suffer.

Hmm, a typical rule (if there is such a thing) is .004 -.0045" per inch of bore, so a 3.54" bore would want a .0141 -.0159 gap.
That is at the upper end of the gap range I see for the top ring (.008-.016) and greater than the range for the #2 ring (.006-.014).
I am certainly not an expert. I'm curious what actual dimensions have worked for people currently doing this with current new parts.