I have a newly arrived jspec and I am proud to say that I get strong smooth "puffs" form a ghetto-compression test. I have the engine on a stand now and am prepping it to be installed. on inspection of the internals that I can see from the spark plug and exhaust holes, the apex seals look intact and pretty, but there is quite a bit of carbon buildup on the rotors.

Does anybody have a suggestion for breaking that stuff up and getting as much of it cleaned out of the engine without dismantling it and BEFORE I get it installed and fired? I was gonna soak it in MMO or ATF I just don't wanna risk a chunk of carbon getting stuck and helping destroy a seal.

searched and read up but no specific answers were found.

Thanks fellers.

 

There are many anecdotal “old wives tales” procedures written up, but I have seen none vouched by really experienced mechanics.
The rotary engine will put up with much, so most don’t hurt, but they don’t help either.
The ATF trick is useful for un-flooding & maybe freeing up a stuck seal, but not for cleaning.
The best advice is get it running & tuned, then just redline it periodically.

As you can tell, I'm from the "if it aint broke, dont fix it" school.

 

I've unflooded many 7's with the ATF before and have been suprised. I'm kinda from the "sounds like there's nothing wrong, just wanna make sure it stays that way" school but I'm a little cautious when it comes starting it after seeing the blackness inside there ya know?

 

Actually a thin layer of carbon is good.
It insulates the rotor face to allow high combustion temps with cooler rotor temps.
A thick, loose, flaky coating can be a problem.

 

yeah, I saw some actual built up kinda chunky layers is why I was worried, its wasn't just a smooth layer of it.

thanks

 

If you were thinking about porting, now would be a good time.

 

I would just by a gasket set and take the engine apart and clean and put it back together.