Originally Posted by vipernicus42
(Post 7875198)
... They're S1 rotors?!
How can you tell? I'm not the one who labeled them, so I was going by the auction but I thought the F and the R in the combustion chamber recess meant S3 rotors..? Jon Edit: In either case, the entire rotating assembly is being rebalanced anyway. As good as the balancing is from the factory, I want "the best" so I'm paying for a complete rebalance as part of my "ultimate streetable 12a" build. Don't make me take out the n00b stick... :) :wavey: https://www.rx7club.com/1st-generation-specific-1979-1985-18/identify-these-rotors-708362/ |
the later rorors have a "N" stamped on the rotor face
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Damn.. yup so they're not S3 rotors. Looks like I'll have to get my hands on a fairly accurate scale to doubly confirm exactly what they are.
As I said the entire rotating assembly is going to be rebalanced anyway, so it's no big deal which rotors and counterweights I have since they'll balance the whole shebang. Plus, I'm going to need to get a counterweight since I'm going lightweight steel flywheel, so at least now I know what I'm looking for. Too bad, I was kind of hoping to use the lighter 83-85 rotors in my "Ultimate Streetable 12a" build...paying to have them lightened is just beyond my $4k build budget. Jon |
Originally Posted by 680RWHP12A
(Post 7875709)
the later rorors have a "N" stamped on the rotor face
I will try to find the N in my set... just in case |
oh, just one thing
didnt the chamber on 78/80 rotors had a different shape? like 13b rotors? |
I can almost guarantee you that those have been glass bead blasted.. DO NOT PUT THEM IN A OVEN! I did that with a intake that i blasted to powder coat them.. The glass thats almost certain inside the rotor will turn into a slurry and be almost impossible to get out..
I would put them in a bath with diesel or kerosene and let them sit there for a while. Then scrub them with a household brush (like the one you do the dishes with). If you have a paint gun, fill it with thinner, and spray them down. Then compressed air. Repeat if needed. |
I wouldn't have purchased those rotors. But since you have them, I wish you luck.
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I've used blasted rotors before. There's nothing wrong with it as long as they are cleaned really well afterwards. There are also different types of media that can be used. I'd never use sand to clean a rotor but walnut shells (I'm serious!) would be fine. Some media is meant to clean. Other is meant to do more. I wouldn't have blasted the bearings or stationary gear faces. I always pressed mine out first (bearings) and then used new bearings later. The gears I always just masked off really well.
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Originally Posted by Jeff20B
(Post 7884824)
I wouldn't have purchased those rotors. But since you have them, I wish you luck.
Too bad it costs so much to have RB snap-ring a gear in there, or I'd just have the stat gear part replaced along with the rotor bearing. Then there'd be zero contact between the rotor's blasted surface and anything inside the engine.
Originally Posted by rotarygod
(Post 7884914)
I've used blasted rotors before...
I'm hesitant to use these in my "Ultimate 12a" build... But since the worst I can conceive of happening with them is seal stickage, I think I'm going to run with these anyway and see. If a seal sticks, it's not the end of the world - a soft seal kit and a new set of rotors and I'm back in. Though re-clearancing all the seals would suck... And if it somehow had an effect on the stat gears that could be fatal... Gah, I'm going to have to think about this one really seriously. You never know though, there may be nothing wrong with using them, since we haven't really had someone come out and say "I used rotors like that and forked my engine". I've still got many parts to collect, so I've got plenty of time to think. Right now I've got rotors and an e-shaft. I've got irons that I can get ground down and re-nitrided and passable rotor housings, but I may end up replacing those with new or closer-to-new parts. Jon |
I've never had issues at all with seals sticking. The finish isn't as rough as people make it out to be. I've always used new seals and have clearanced them. It's always worked fine for me. 2 engines built this way. Yes it was 2 cars!
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Jon, you don't need to worry about a seal sticking. Just take the time to clearance them and they will be fine. .002" is your magic number.
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Nice pics...
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Originally Posted by Jeff20B
(Post 7889023)
Jon, you don't need to worry about a seal sticking. Just take the time to clearance them and they will be fine. .002" is your magic number.
Leesha - thanks for the comments. Whereabouts in Canada are you? Jon |
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