Before and After
#1
Before and After
I had an old 13B sitting around from a Rotary Truck. It's actually a 12A converted to a 13B. At one time, it was a nice motor but then it sat for years after losing a coolant seal. I needed an engine for my MazdaSport Magazine project car, so I tore it down and cleaned it up. It's not ready for assembly yet, but I took another picture of it to compare the before and after refurbishing. Startling how far it has come.
I media blasted the plates and had them surface ground and lapped, ported them and painted them red. The rotor housings were just media blasted and will be ported shortly. It's not an extreme engine but the transformation is pretty cool.
I media blasted the plates and had them surface ground and lapped, ported them and painted them red. The rotor housings were just media blasted and will be ported shortly. It's not an extreme engine but the transformation is pretty cool.
#3
Originally Posted by Kim
Looks nice, what paint do you use?
#5
Here is the side-by-side before and after of the rotor housings. Cleanup only required media blasting with glass bead.
The side housings were surface ground and lapped, then I finished them off by hand with a stone, so there was a bit of crosshatching for oil retention.
For painting the side housings, I mocked up a motor with junk rotor housings and front cover, then blocked off all the openings and capped the threaded holes. Finally, I scraped any excess paint off with a razor blade.
The side housings were surface ground and lapped, then I finished them off by hand with a stone, so there was a bit of crosshatching for oil retention.
For painting the side housings, I mocked up a motor with junk rotor housings and front cover, then blocked off all the openings and capped the threaded holes. Finally, I scraped any excess paint off with a razor blade.
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#8
Lives on the Forum
Super nice work!
But, I'd worry about the paint next to the exhaust ports on the side housings, especially with the center housing?
I would think the paint would "burn" and cause a pretty good stink?
-Ted
But, I'd worry about the paint next to the exhaust ports on the side housings, especially with the center housing?
I would think the paint would "burn" and cause a pretty good stink?
-Ted
#9
Resident Know-it-All
iTrader: (3)
nah, ive painted a few engines with the same stuff, never had any problems. Its supposed to be 500F rated, so i guess the housings never get that hot, even next to the ports. I cant remember looking at the exhaust ports on any that were torn down, but i dont recall seeing any blackened paint or anything, and i painted the rotorhousings too. That paint will flake off if the engine sits for too long tho..I sold a car to a guy with an engine taht i did, which sat in his yard for a year or so, looks like crap now....
looks like you did a nice job.
looks like you did a nice job.
#10
Originally Posted by RETed
Super nice work!
But, I'd worry about the paint next to the exhaust ports on the side housings, especially with the center housing?
I would think the paint would "burn" and cause a pretty good stink?
-Ted
But, I'd worry about the paint next to the exhaust ports on the side housings, especially with the center housing?
I would think the paint would "burn" and cause a pretty good stink?
-Ted