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  1. kidturbo

    Twins with Twins, Anyone?

    Thought about it for a minute, then concluded an 0.0005 gap isn't gonna let much of anything in.. Gravity was on our side also. Plugged the rod journals, so will just flush the main line with clean oil before installing pistons. Then prelude system same as before when done. It wasn't really...
  2. kidturbo

    Twins with Twins, Anyone?

    Heck no. Just masked off the decks and wrapped up the rod journals nice and neat. Once we finished couple hone passes, washed everything down with brake clean and hit it with some wd40. Built these to be serviced quick and easy, this was a good test of that design concept. Sent from my...
  3. kidturbo

    Twins with Twins, Anyone?

    Dustin brought his bead hone over today. Most of the scuffs came off with just a few passes. But still a couple with marks that will be there till the next rebuild. Sent from my SAMSUNG-SM-G890A using Tapatalk
  4. kidturbo

    Twins with Twins, Anyone?

    This set only has couple hours running time. While the other set with 8-10 hours showed much more lifting on the top. So I would like to remove it all and then polish the tops as I had good luck with that approach on previous build on std race cast pistons. Sent from my SAMSUNG-SM-G890A using...
  5. kidturbo

    Twins with Twins, Anyone?

    Cool will do. Gave the glass beater a shot. No luck with fine material. Cleans the soot off nicely, but just smoothes out rough edges on the coating. So guess I'll be calling up Swain Tech again tomorrow to explain how I'm not risking 5k worth of pistons to remove their F-up's. They said they...
  6. kidturbo

    Twins with Twins, Anyone?

    No that's only second time I've been out to Raleigh area. It's a good haul out there off of I77 that I normally travel.
  7. kidturbo

    Twins with Twins, Anyone?

    And not being one to take another persons work for granted, I popped a couple top rings down in few random bores. Checked 3 places top to bottom, .026 gap on the money. Now I'm going to go test my luck blasting this TBC off. Then order some new rings to file down again. Which I haven't...
  8. kidturbo

    Twins with Twins, Anyone?

    Yeah I'm gonna say while this set only made a few short pulls, they saw the biggest pulse width [2850us], most heat [1800f], with shortest break in period [has oil pressure, send it] ... :rofl: Which all those points alone fall under several possible causes listed in that PDF. If you read each...
  9. kidturbo

    Twins with Twins, Anyone?

    Here is a PDF I found that examines many types of diesel piston damage, and offers known causes with detailed explanations. Good read, with pictures.. :D https://cdn2.ms-motorservice.com/fileadmin/media/MAM/PDF_Assets/Piston-damage-recognising-and-rectifying_51730.pdf Mine seem to be...
  10. kidturbo

    Twins with Twins, Anyone?

    On a good note, the pressurized wrist pin bushings look to be running happy happy happy on both engines.. Sent from my SAMSUNG-SM-G890A using Tapatalk
  11. kidturbo

    Twins with Twins, Anyone?

    On engine #1, 7 of 8 top rings show significant damage on the face. Mostly isolated to area matching the coating damage on top land. Being the short run time, the rings don't look to have rotated much from installed positions. Only a couple of the second rings showed any marks where material...
  12. kidturbo

    Twins with Twins, Anyone?

    No, from what I can tell the worst of it is related to the side coating. However on the other engine there is some scratches that don't Mach up. And flaking off the top is surely gonna cause hot spots where it's missing. Sent from my SAMSUNG-SM-G890A using Tapatalk
  13. kidturbo

    Twins with Twins, Anyone?

    Yeah coated only about halfway down. This call also on the suggestion of swain to protect the crown. Zoom in on piston pic post 783. NC, I ran down to Raleigh to check out an LT5 engine my buddy at Crawford Racing is doing. Little CANBUS and L5P throttle body hacking side project. Sent from...
  14. kidturbo

    Twins with Twins, Anyone?

    Ok started pulling rings tonight and I can say for certain, they are not butting up or binding. Carbon on the ends, no sign of touching or anything out of the ordinary. See pic below where I scratched a ring end for contrast. With a .026 gap on top ring, and no real run time at load on engine...
  15. kidturbo

    Twins with Twins, Anyone?

    Piston pictures are all upside down sting... LOL I checked a couple of the top ring no sign of them touching. But I haven't pulled them off and pistons yet. From my observation, as the Piston starts up it is rocked in One Direction, coating touch the wall and rubbed off then gets caught between...
  16. kidturbo

    Twins with Twins, Anyone?

    Maybe I was a bit quick to call NO damage from the coating. Looks to have played havoc on the top rings and the crown in a few spots on several pistons. Just noticed it while tearing em down to strip it. Sent from my SAMSUNG-SM-G890A using Tapatalk
  17. kidturbo

    Twins with Twins, Anyone?

    Unfortunately like a lot of this industry, the failures are known only through word of mouth.. As I posted a few pages back, "Failure Is Always An Option!" Own it, learn from it, make it better.. Luckily I designed in some hardware features that makes such hiccups easier to deal with. Like a...
  18. kidturbo

    Twins with Twins, Anyone?

    Ok spoke with Swain again today. Said no idea why it would be lifting besides fact pistons set for almost 2yrs before seeing any heat. No way to guarantee it doesn't repeat it next week. So my warm and fuzzy feeling on coatings has changed to the current outside tempature... Suggested glass...
  19. kidturbo

    Twins with Twins, Anyone?

    Unless someone looking to run forged pistons has a pair of fresh straight up +.020 LML blocks to trade for these, I'm sending it... Jon and spoke briefly about developing a piston stretcher tool for just such ocasions. But I've all ready committed to helping out with Mark's brass magnet idea...
  20. kidturbo

    Twins with Twins, Anyone?

    Our thing is sustained high rpm running. Like minutes at 3500r loaded. I thought we ordered the blocks .001 over, but been so long I'd have to check my notes. Sent from my SAMSUNG-SM-G890A using Tapatalk
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