core teardown/ugabuga's engine build
#1
kevin@rotaryresurrection
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core teardown/ugabuga's engine build
Forum member ugabuga sent his engine for rebuild. He said it had 55k, but it is a mazda reman. It looks like it was one of the "good" remans, too, with mostly new parts and properly assembled without gobs of sealant everywhere.
Last edited by RotaryResurrection; 03-30-2013 at 02:25 PM.
#3
kevin@rotaryresurrection
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As you can see you chipped a chunk off of one apex seal, which flew around and pinched the next one until it also broke. Luckily the chunk somehow exited the engine with zero damage to either iron, which is unusual. He really dodged a bullet there.
Looks like everything is probably okay except the front rotor housing. The front rotor can PROBABLY be doctored up and reused, but I won't know for sure until I can media blast it clean and then try to file on it and reset the apex slot clearances.
Looks like everything is probably okay except the front rotor housing. The front rotor can PROBABLY be doctored up and reused, but I won't know for sure until I can media blast it clean and then try to file on it and reset the apex slot clearances.
#5
You gonna eat that?
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Hi, that is very interesting. 1st time I see that step by step like that. Not sure exactly how everything should look, but is the carbon build-up everyone talks about just on the rotor, or does it get on the housing too? Please forgive my ignorance. Thanks for posting pics.
#6
rev it up
Bit of scouring on the side plates. Could these be caused by the seals?
I assume when the spring is fully compressed it could protrude out a bit from the corner seal or cause the corner seal to move out causing the scouring mark. It is just a wild theory comming from someone who is still learning about rotaries.
I assume when the spring is fully compressed it could protrude out a bit from the corner seal or cause the corner seal to move out causing the scouring mark. It is just a wild theory comming from someone who is still learning about rotaries.
#7
Listen...you smell that?
I'm just in the middle of my own first rebuild. From what I've learned thus far if I pulled a rotor that looked like that out of my engine I would've thought it absolutely needed to be replaced. I thought gouges like that can create hotspots and ultimately detonation and yet again more seal destruction, no?
#9
kevin@rotaryresurrection
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And then in person I could tell it was a reman.
Side seal clearance seemed to be around 10-15 thou...way higher than I like it.
#10
kevin@rotaryresurrection
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I'm just in the middle of my own first rebuild. From what I've learned thus far if I pulled a rotor that looked like that out of my engine I would've thought it absolutely needed to be replaced. I thought gouges like that can create hotspots and ultimately detonation and yet again more seal destruction, no?
#11
kevin@rotaryresurrection
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Hi, that is very interesting. 1st time I see that step by step like that. Not sure exactly how everything should look, but is the carbon build-up everyone talks about just on the rotor, or does it get on the housing too? Please forgive my ignorance. Thanks for posting pics.
#12
kevin@rotaryresurrection
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Bit of scouring on the side plates. Could these be caused by the seals?
I assume when the spring is fully compressed it could protrude out a bit from the corner seal or cause the corner seal to move out causing the scouring mark. It is just a wild theory comming from someone who is still learning about rotaries.
I assume when the spring is fully compressed it could protrude out a bit from the corner seal or cause the corner seal to move out causing the scouring mark. It is just a wild theory comming from someone who is still learning about rotaries.
That made about as much sense as a "buy 1 for the price of three, get 1 free" sale.
#13
You gonna eat that?
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Thank you very much! "Knowledge is good", Emil Fabir.
#15
FULLY SEMI AUTOMATIC
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as always thanks rr for posting pics
#16
kevin@rotaryresurrection
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Update: engine is built.
Parts cleaned and ready...
Rotors nice and cleaned up.
Owner got lucky because even though he broke apex seals and destroyed a rotor housing, the damage to the rotor was light enough that I could salvage it by filing and restoring the apex slot clearance. This saved the cost of a replacement rotor at roughly $250 used or $700 new.
Obviously he had to have a replacement rotor housing, and I came up with a close match in terms of surface condition/wear to his other surviving original. I also do a little touch up work to the leading spark plug holes on all the rx8s that I build (unless they are new rotor housings) to hopefully mitigate some of the swelling and cracking that happens in that area.
Parts cleaned and ready...
Rotors nice and cleaned up.
Owner got lucky because even though he broke apex seals and destroyed a rotor housing, the damage to the rotor was light enough that I could salvage it by filing and restoring the apex slot clearance. This saved the cost of a replacement rotor at roughly $250 used or $700 new.
Obviously he had to have a replacement rotor housing, and I came up with a close match in terms of surface condition/wear to his other surviving original. I also do a little touch up work to the leading spark plug holes on all the rx8s that I build (unless they are new rotor housings) to hopefully mitigate some of the swelling and cracking that happens in that area.
#20
DSC Off
Great Job RR. Looks like the work of a master rotard haha. I'll definitely be coming to you when I need a rebuild, no telling when that'll be. Compression is in the 7s and has stayed there since I started pre-mixing, so..... fingers crossed!
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