Starting on my 16vT/ABA

[slorydgti]

the 16v intake valves open well below the botom of the head they will hit the aba pistons if they are not modified.ive already checked it out on my engine.i decided on 9a pistons instead.

[chilledOUTmk1]

So when using the 9A pistons in the ABA bottom end, there is no clearance issues with the valves?

[Moshua]

the 16v intake valves open well below the botom of the head they will hit the aba pistons if they are not modified.ive already checked it out on my engine.i decided on 9a pistons instead.

Do you have a suggestion on what valves to use or perhaps point me in the direction of a thread that gives more info

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[slorydgti]

i would search this site and find out what people did and then find a machine shop that will do it.im no expert but if the intake valves open when the piston hits tdc there done.heads done.the 16v pistons are recessed for a reason.it shouldnt cost much to get done.you just need to figure out what to do.

[Moshua]

i would search this site and find out what people did and then find a machine shop that will do it.im no expert but if the intake valves open when the piston hits tdc there done.heads done.the 16v pistons are recessed for a reason.it shouldnt cost much to get done.you just need to figure out what to do.

Yeah I know what you are saying though I'll try a dry fit and see if and how much I'll have to take off of them. I thought I had researched enough but I'll look into it more to see what options I have on valves too

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[chilledOUTmk1]

From what I have gathered, when timed properly, there is no contact between valves and pistons when using stock 9A head and stock ABA bottom end. Guess Ill just have to bolt **** up and see.

[Moshua]

From what I have gathered, when timed properly, there is no contact between valves and pistons when using stock 9A head and stock ABA bottom end. Guess Ill just have to bolt **** up and see.

That's what I thought too.

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[SwiftMKIII]

I ran OBD2 ABA pistons in mine for a while, and decided I wanted a higher CR, so I swapped them for stock 9a pistons.

I had contact marks on the pistons from the valves. Didn't bend any, but definitly hit. I think the head had been shaved prior to my getting it, so that may have played into it. I bolted it together with some clay on the pistons, then spun the crank. It looked like it was going to work, but must have gotten closer as it heated up.

Long story short, it may be well worth the time to cut valve reliefs in the ABA pistons (~8.5:1 CR) or use 9a pistons (~9.2:1 CR).

[Moshua]

I ran OBD2 ABA pistons in mine for a while, and decided I wanted a higher CR, so I swapped them for stock 9a pistons.

I had contact marks on the pistons from the valves. Didn't bend any, but definitly hit. I think the head had been shaved prior to my getting it, so that may have played into it. I bolted it together with some clay on the pistons, then spun the crank. It looked like it was going to work, but must have gotten closer as it heated up.

Long story short, it may be well worth the time to cut valve reliefs in the ABA pistons (~8.5:1 CR) or use 9a pistons (~9.2:1 CR).

is there a way to make the valves not come open as much. is that even possible?