Good for endurance apps?
In agreement or trying to play nice with opinions. I will be the first to agree that on a regular tear down motor be it between rounds or after a race weekend. Personally I have never seen a button fail or score a cyclider wall. On another opinion if a wrist pin fails which would you rather have fail a pin button or a retainer? If either fails you have more problems than a pin button or clip! If there is so many proplems going on in the reciprocating mass to pound out a pin clip or button the day has just begun. IMLAO MGood for endurance apps?
That button rattling around in that piston...not going to be much left of it after long in an endurance applicartion. That is going to lead to metal particles moving through your engine. The plastic buttons too. Nylon, Teflon, Delrin, all are heavier than a single round wire lock, too.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.
Just one qwick question. Why would anybody with a properly built motor worry about "pounding a pin out" The word floating means just that. Yes in properly built motor centrifical force and geometrics will make a pin move but you tell me what will make one want to "pound out" ???????? Mthink 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
Floating means not pressed in the rod, it dosen't mean floating from side to side. Look up "resonant harmonics".Just one qwick question. Why would anybody with a properly built motor worry about "pounding a pin out" The word floating means just that. Yes in properly built motor centrifical force and geometrics will make a pin move but you tell me what will make one want to "pound out" ???????? M