Good for endurance apps?
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I ve only seen them used on engines that constantly get tore down.
Have used them mostly in custom pistons when I have to order them and I remember to check the pin button box. All the off the shelf stuff comes with spiro locks, wich I dont mind either. Even have some pin buttons in street engines. The buttons I use are made of aluminum and have no hole in them. Bore to button clearence is about .020". I was curious about the endurance part, and the reason for not using them in these apps.
IMO it's just being lazy. (no offense meant) I'm pretty sure the idea became popular in drag racing where guys were going through pistons and/or rods between rounds. Made the swap a lot quicker and easier. They really have no other benefit.
If God is your co-pilot, change seats!
Acts 2:38, the perfect answer to the perfect question.
agree with ol guy on this one . have made them out of alum. bronze for putting floating rods on the older style street forgings that didn't have grooves . way easier to make than grooving the pistons for locks most of the new pistons now have a lot narrower pin in them , so the " button " would have to be a lot longer . don't know why they would be a problem
How many cup engines (nextel) do you think use pin buttons? I am sure everyone knows the answer. They are endurance. How many drag engines use them? Less and less every day..except fuel, BA, HIGH MAINTENANCE stuff.
Great in the right application. Our boat stuff is not the right application.
If spirolocks torture one so much, take them to a professional engine builder..not an assembler, magazine reader, etc. They can be installed in about 10 minutes for a set of 32, should be able to remove them in a little more time.
They are a pain in the ass if you don't do them often. If you do them frequently, they are almost as easy as the old true arc stuff (close).
think about this, the end play with spiral/Tru Arcs is about .003-.005 max. To get numbers like that with buttons, they would have to be available in a slew of size's for each bore size+clearance. It would be like ordering rings to the exact size you need so you didn't have to file them. So instead they make them with .020+ clearance and let the pin rattle like hell, FOR A SHORT PERIOD. Think that pin doesn't become a battering ram with clearances like that? Only put one spiral in, on "one" side next time you build a motor and see how long it takes to POUND it out. On top of that they are heavy as hell
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