I was just sitting here thinking about engines and how my engine still has some vibration; More so than most rotaries anyway. It popped into my head that maybe severe carbon buildup could cause the engine to be thrown out of balance. When I pulled my engine out and replaces gaskets a few weeks ago I could see a good bit of carbon on the rotors. Seeing as its ussualy pretty evenly spread on all 3 faces, unless due to a seal failure, it shouldnt cause much imbalance should it? Plus the ammount of it ussualy on rotors is minimal. Just an idea I had and wanted to throw out and see if anyone had any input on it. I havent seen it mentioned before, so why not. Though I dont think it would for above reasons.

 

well an easy way to test if there was excessive carbon would be to do the water treatment and see if that fixed your problem.

 

Weird thing is I actually tried that the other day but my vacuum wasnt strong enough to pull the water out of the bottle. Not sure why that is exactly. Ive run a bunch of seafoam through the gas though, not sure how much that breaks down carbon. Mainly though Im just asking a general question, not so much for me.

 

Well I don't know about the carbon build up causing vibration. I would think that it would have to be quite a bit to make it out of balance. When I first bought my FC it had a slight vibration also, but I found that the cats were getting plugged causing a little to much back pressure against the engine hense the vibration. Luckly for me there is no emission testing where I live......so out they came and it runs smooth as glass.

 

that might be some of my problem then. i just installed a new flywheel, clutch, stiffened trans mounts, stiffened engine mounts and of course t/o bearing, pilot bearing and seal and some other stuff. so aside from engine imbalance it should be running smooth as glass. so its either something like you said or its an ignition issue perhaps. I can feel the vibration in the pedals, in the shifter and throughout the entire car. Nothing is loose and nothing is broken as far as I can tell, seeing as its all new and I checked it afterwards

 

You have a problem if it isn't pulling enough vacuum. Incase you didnt notice the brake booster line only goes to the rear rotor.

I don't have any idea which port to use on a TII though.

 

Anyone know what vacuum line is best to use? I didnt know there was a certain one suggested so I just used the line that normaly runs to the bypass valve. Dunno if maybe it was too small of a diameter or too far up the intake