[grivera]

Originally Posted by charlie66

I have been reading a lot about how to break in a new hydraulic roller motor just out of curiosity and a lot of them say to do it in ten-minute intervals of 2800 rpms varying the speed by a few hundred rpms letting it cool down in between them for a 30-minute total run time. so, I've heard about this before.

This sounds like a flat tappet break in process. Where did you read this?

[charlie66]

Originally Posted by grivera

This sounds like a flat tappet break in process. Where did you read this?

They said it's a roller cam. I'll try to get the link over to here it's on my phone. I post here on my desktop.

[Formulajones]

Ive never in my lifetime performed a flat tappet break in with a roller cam and I run a bunch of roller cams here.

I do however use break in oil because there are a lot of other high pressure and high wear areas in an engine that have to get happy with each other. Like pushrods, rocker arms, piston rings, piston skirts, etc.... the only difference with a roller is I don't run the engine at 2000+ rpm for 20-30 minutes upon first fire up. Some break in oils also help ring seating which is important

I will however as I explained dump the oil for fresh break in and continue making sure I keep clean oil in it with frequent changes for the first 1000 miles or so. Give the engine it's best chance, after all these things aren't cheap to build so a couple hundred bucks in oil is nothing.

[Formulajones]

One reason your reading that might be because cams rely on splash oil and they think those roller bearings need it.

It's also another reason you'll read some people like to idle their engines higher, like 1000 rpm or more so it gets more splash oil.

But if you buy good rollers with pin oiling it's a moot point also on flat tappets when you get good lifters with EDM oiling directly on the lobes or the lube option hydraulics, again it kinda makes all that pointless.