All you do is match the bore in the mains to those in the bearing. I did it when i built the motor for Davids Del sol. So the support part of it is a mute point.

This is from www.Theoldone.com

Quote:

I catch a lot of flack about the size I open the oil holes in the bearings out to. Those who don't care for the practice, have never apparently experienced oiling problems, or they've never made enough power to be concerned. We open the oil holes in the bearings, after fitting the bearings to the block/crank with micrometers / dial-bore gauges and finally Plasti-Gage.) The holes are in perfect alignment with the feed holes in the main caps...and oddly enough, they're darned near the same diameter as the oil holes in the crankshaft. Who'd have thought? Also of note, we grind the edges of the girdle to remove any radius. That might sound strange, but sharp edges will "shave" oil off the rotating crankshaft and rod assembly with considerable efficiency and that's very desirable for a performance engine. It's also free, if you have a little time to spend.

 

Have you guys seen any difference in oil pressure before / after this process?

 

When i did davids i didnt see a huge change in the PSI, its been a while but i beleive it was only a couple psi.

 

thats cool, i might look into doing this on the next set of bearings.

I need to get this thing all fixed up!

 

fix your car.

 

Reliability varies depending on situation.

If you guys are talking street driving. Yeah of course.
If you're talking drag racing. No. I doubt any make engine lasts 20,000+ miles.
If you're talking road racing, yeah maybe. If you take it to a reputable racing shop to build and tune. That's not cheap by any means. Even then the reliability is a factor depending on your build. When building a 400-500 Civic you aren't thinking about anything other than drag racing. It's the only thing it's good for at that point.

Most 400-500 hp Civic's I've seen are street cars. They see the drag strip a few times a year. If their engine isn't blown, their axle is, if their axles are good, the transmission is acting up. If not the transmission something else. Unless they run their big boy slicks they're basically a burn out machine as well.

I've watched this thread and HatchVX's thread. Both of you know more about these engines then I do. HatchVX almost blew his motor. You did blow your motor. I'm guessing none of these were your first motors either.

All I'm really saying is, just make sure you have some return on your investment in these cars. I really shouldn't talk I've got 15 times the value of the car in my current turd, but my motor is stock.

 

I think wasting money comes with the territory.

 

Mine was a complete rebuild at the time so my pressure went up, but I don't think it had anything to do with the bearings. I didn't feel comfortable opening mine up as much as in the picture so I think I went with 3/16. As I recall this is considered a necessary mod for high revving Y8s due to their crappy oiling system.

 

well in any event, the car will be comming apart this weekend. I'll be droping off my extra crank at the machine shop on monday to get cleaned up & ready for action. I hope to have it back together in about a week or two.

In the mean time. I'll be powder coating (swamped) & keeping my self occupied with the streetbike and off-road toys! At least i won't be bored.

 

mite have a line on a cherry ls crank, call me when you see this.