All the Drag Radial Nova Updates we’ve made over the years…
Line2Line Abradable Piston Coating Followup
I promised a follow up on how well the new Line2Line Abradable Piston Coatings performed in my previous post about Abradable Piston Coatings, and I'm pleased to say it worked quite well. Here's a photo of the coating after the 2015 racing season, we put 43 passes on the pistons.
My initial goal for the coating was to attempt to reduce piston rock by fitting the piston tighter in the bore. Best I can tell, we really didn't totally fix that problem. I was able to confirm it as I put 2 new pistons in on the last rebuild and those still showed signs of piston rock. I think we're just going to have to work on the skirt length and/or shape both to improve on that issue, as the coating wore in (like it's supposed to) but was just not enough to tighten the piston up that much in the bore to prevent it from rocking. For those not familiar with my car, these Diamond pistons were used in a 582 ci Big Block Chevy Nitrous application that we run in Drag Radial/X275 type events.
Line2Line has various hardnesses of their coatings available, I believe the one we used on these pistons was the softer of what they have. I believe on the next set we do I'll request the next step or two harder coating, perhaps that will work a little better. You've gotta start somewhere on new ideas, and I'm very happy with how well the coating held up compared to past piston skirt coatings we've used. You can't really see it in the photo, but when the light is right you can see where the coating has wore down on the high spots, just like it's supposed to do.
Others have asked about the break in process, I didn't do anything special. When I first fit the pistons to the bores as instructed by Line2Line, I was a bit worried as they fit very tight initially and make the engine tough to turn over. When you get the pistons back from them, they may be so tight they won't even fit in the bore. The process to fit them is to sand the skirts with like butcher paper or newspaper. Yes that sounds a bit sketchy, but it actually works just fine. All the pistons fit pretty tight in the bore when I was done. I didn't lube them with anything but a light mist of WD-40 on final assembly.
On startup, the engine might have cranked over a bit slower than before initially, but I think the piston coatings broke in pretty quickly once the engine fired up and got a little oil on the bores. After that it started like normal, in fact I think when spinning it over by hand it might have even turned over a little easier than before. Might be my imagination on that one though!
We did not go through any special break in procedure, I fired the engine up several times in the shop and brought it up to around 120-130 degrees setting timing, etc. but didn't make any attempts to heat cycle things. We sprayed it the first time out and actually ran a new personal best in the car on the 5th pass, and won! It was a great start to the season last year.
On August 8th, we won the MAKO race at Kansas International Dragway against my friend Mike Peters. The track was a bit challenging in the heat, we went a 5.17@146 in the final to take the win. Mike's been still sorting his car out after a bunch of changes last winter and knocked the tires off at the hit.
We raced Tulsa's Throwdown Makup Race on August 15th. We struggled in qualifying but Friday night got a 4.79 during Q2 so we qualified well. In eliminations we ran Tony Phillips and the Nova stood up then went right, had to peddle it. I got lucky on that one, Tony spun at the hit so we made it to the next round. We drew radial bad ass Taylor Lastor in the 2nd round, he edged us out in a 4.770@150.77 to his 4.74 race it looked close from the driver's seat, but not quite enough. A new personal best for the Nova, but not quite enough to hold off Taylor, he went on to win the race.
At MAKO's MoKan Labor Day Race on September 6th, we got to the semifinals and ran a 4.8622@148.8 against Mike White driving Brendon Russel's Malibu. They ran a 5.15, but unfortunately I went red and wasted the pass. Since this was the last MAKO race of the year, it did get us enough points to win the very short points battle, if you can call it that. But hey, I've worked 10+ years to get a MAKO Championship so I'll take it!
We qualified #2 at Ozark Street Machines September 18th, but transmission flare shift problems came back and caused us to quit early. Flip-O-Matic Racing Transmissions has been working with us to help fix this issue which has been plaguing us since last year, it's been a bit difficult to figure out. We got three races out of it last time before it acted up again, this time the drum galled on the pump shaft, we think misalignment was causing this and also making the internal seals in the drum leak. New improved parts are on the way now and we're getting ready for the Throwdown in T-Town.