Tom Notch wrote:
Yup, old, old, old trick told to me by my dad.
Tom Simon wrote:
...So this begs the question, "anyone ever heard of the Bonaime (scouring powder) ring seating method?"
From everything I have heard, this is one of the folk lore stories that won't die. I heard that it was Catapiller diesel that started it and shortly thereafter, tried to stop it as it ruins all bearing and friction surfaces in the motor. From what I understand, the story was way easier to start than to stop (evidenced by people still spreading the story). It sounds so logical and you want it to work so you believe it. I heard it from my father who then tried it in a 64 beetle. The motor was totally destroyed within 5000 miles. In those days, there were no cam bearings so the crank, block, valve guides, cam and followers were all shot. In this case it didn't fix the ring seal problem either but when we tore the motor down, it turned out to have the standard size rings in an oversized barrel. From painful experience I have learned that very few "cure in a can" approaches work and there is no substitute to doing a careful quality job in the first place. If it doesn't work, go back and find out what you did wrong. Given how much time we spend adding oil filters and changing the oil regularly, dumping an abrasive into your motor sounds a bit like sabotage.
A quick google search turned up a fair number of "I heard that it works" and a couple of "Don't listen to them" sites.
I know I learned my lesson and will not try it again.
Just my $.02....