What is the best way to size a synthetic HW piston seal? What do you use to determine weather it is sized correctly? Uj
Tuning Sizing Piston Seal
- Thread starter Uglyjohn
- Start date
I chuck the piston up in a lathe and use 320 grit emory cloth backed with a file to apply pressure. A drill press will also work.
Problem you may run into is the seal will spin on the piston. Tape at the rear will prevent this, or a drop of super glue before the piston seal is installed.
I usually install them on the piston with some two part rubber epoxy, and put it in the lathe held concentric with the tailstock overnight. It's overkill, but I like them solid mounted and concentric from the start.
As for fit, remove some material, lube and test fit. I like them to slide in the compression chamber with one finger pressure. Nowhere near a free fall, and not a firm thumbs worth of drag. Just a smooth one finger push. Obviously not very scientific
Too tight is better than too loose if you have any doubt. Worst case is it costs a tiny bit of power, and increases temp sensitivity.
Problem you may run into is the seal will spin on the piston. Tape at the rear will prevent this, or a drop of super glue before the piston seal is installed.
I usually install them on the piston with some two part rubber epoxy, and put it in the lathe held concentric with the tailstock overnight. It's overkill, but I like them solid mounted and concentric from the start.
As for fit, remove some material, lube and test fit. I like them to slide in the compression chamber with one finger pressure. Nowhere near a free fall, and not a firm thumbs worth of drag. Just a smooth one finger push. Obviously not very scientific
Too tight is better than too loose if you have any doubt. Worst case is it costs a tiny bit of power, and increases temp sensitivity.
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Different opinions are around on seal fit, and most all of them will certainly work fine. This is just how I've come to do it, and it's been good for me so far.
Have fun. Holler if you need help.
Have fun. Holler if you need help.
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