Hey fellas, i've got a quick question....can rotarys become out of balance? cause my engine rocks and shakes and makes a kinda knocking sound.....could this be?

 

Yes they can, first of all have you checked all your mounts? After that you'd have to suspect the counterweights.



Santiago

 

your engine can bounce all around if you are low on compression on one rotor... Check the compression

 

yea, the mounts are fine......i had a friend come over and he tuned the carb while it was running and he got it to idle perfect, but then we turned it off in order to see if it'll start fone, and we couldn't get it fired back up.....what is the problem????Could this be an ignition problem? It doesn't start up hardly at all.....and when it does fire up it's just me getting lucky....so it idles fine but doesn't start back up....what's this?

 

mine rocked, clanged and banged for 4 miles.. ate a bearing... i'd say drain your oil and see if any bearing leftovers come out with it...

 

Okay, thanx

 

if a counterweight is fubar, would it completely run like crap? i have a severe, shake the change out of the ashtray, vibration. it only vibrates from 5500 to 6300, any other time it is smooth as can be. and it does it whether its in gear or in nuetral with the clutch disengaged. i cant think of what is causing it...

 

dirty injectors?

 

Yes...a counterbalance out of sync will make the sever shaking. I rode around for 4 weeks with the counterbalance in teh WRONG position...thereby offbalancing everythign and nearly makign me deaf fromthe noise and vibes. But it got fixed and its smooth like silk again.,

 

mine does that due to a missfire. we think i may have a bad spark plug, so you may want to check those. my car is currently out of commission so i havn't checked mine. but my misfire does cause the car to knock and shake a little bit.

 

was this to me? spark plug could not cause a 10th of the vibration i am getting. its something realy out of balance

 

1) compression check. www.rotaryresurrection.com ---> tech ---> compression check

loss of compression soulds like an old lawnmower starting up, or a piston engine running on half it's cylinders.

2) could have spun a bearing if you were low on oil. usually sounds like a thrown rod in a piston engine.

 

so there is a certian postion when you rebuild the engine the counter weight shouod be in?

 

Theyre both keyed to the shaft, and can only go on one way.

 

How about bad timing/tuning?

 

My car sound like #2, like a rod thrown in a piston engine......sucks (TURBO 2!!!!)

 

the only way to make a rotary knock is to spin a bearing or so some other major internal gear/shaft/bearing damage. This often chews up all the irons, the eshaft, stationary gears and bearings, and rotor bearings...and often tears up the rotors themselves. I have seen this damage result in no reuseable parts except a front cover and 2 rotorhousings. I have also seen it be isolated to the rotor bearing and eshaft only. , requiring <$100 in core parts to repair plus seals.

If it is doing what you say it is, I would go on and start tearing it out/apart now. No use in damaging it further.

 

detonation can cause similar noises but i don't think it's possible to even advance the timing enough for the engine to still idle and detonate, usually detonation only occurs under a load in rotary engines.

if there is metal in the oil then do not drive the car until it is fixed or it will cost you more money as kevin said, bearing and lubrication issues are the most costly to fix. i have a rebuild in now that had a lack of lubrication which resulted in very few usable parts.

 

so, if this is what happened i should more than likely just change the motor out? I really want a turbo 2 but i don't know how/ where about getting a harness for it....

 

The only way I have ever gotten a rotary to detonate at or near idle is with a lot of starter fluid