quote:Originally posted by GT4Peter:
Yes thats right George! In fact , we did a lot of engines in the past and always use mahle rings. When the oil preassure is ok, it was always ok , when audi or bmw or toyota engines were running longer times on idle. Sometimes , I let them run a few secounds at high rpm , but most of the time they run idle . Thats what I did in the past and I had never a problem like this.
Normaly, when I repair a engine, I buy the parts from Rothmund and the sales agend give me the "good stuff". Never had piston rings, wich do no compression , when they are new , or running for a few hours!? For only 20 bucks more they sell moly rings, so why they sell "cast" -rings ?
All the work 4 nothing - ok this time I use moly rings , and will drive with the car for brakein. Maybe a carburated engine is diffrent to modern engine.
What rings would you suggest ? Does somebody drive cast rings ? Thanks
Some recommend a combination. Molly on top, cast iron on #2.
I generally use molly on both. I'm not seeing where there should be any kind of issue unless the cross hatch on the honing is wrong?
I don't disagree with the break in recommendations but the reality is that they are seated within 5 minutes of start up and to do that you need to keep the engine running which means probably something around 1800 to 2000 rpm.
It's like something you would see with a cold start and fast idle until warmed up. That's enough right there and once you can get it to idle down without stalling the rings are done seating themselves.