Root79Rx7

Went and talked to the local Mazda dealership for tuning. The man i talked to is thier rotary specialist. Question, when reving the car there is a noise coming sounding like a belt slipping. it is a hi pitched niose, he said it is the engine "pinging" or "knocking" the rotor rubbing against the chamber walls, and he then said to put HIGHER octane to stop it. I guess the question is what is this Pinging what can i do and i have always been told NOT to put high octane in it and he says to put it to solve this problem. thanks

bliffle

Describe the sound better, please. Sqealing noise is not ping. Pinging is like rocks rattling in a can. IMO rotaries don't ping if all is OK; only when timing is off. The mechanic should have re-timed the engine.

B

Root79Rx7

well im getting a new eccentric pulley because mine is rusted and cannot see the lines, is there anythign i can do other then getting another one to time it? the sound,i lauph and would say its my turbo, but it sounds differant. um the sud only come when deaccelerating and it can happen at any rpm it almost sounds like ew and du put together and only last for less then a second. hope that describes it better if not i could try to get a sound clip

toxic_d

Double post

toxic_d

Do you have an AFM(air/fuel meter/guage)? If your running turbo its a really good idea to have to help in tuning.

Toxicd_d

bliffle

I can't imagine an engine pinging while decelerating.

B

Root79Rx7

i dont have a turbo, to me it justsorta sounds like one.

Root79Rx7

well, could someone explain to me what pinging and knocking would sound like on a rotary? will it be a chirp or be a constan sound. he also said to get bigger coils, which to me would be upgrading to direct fire because i found no just bigger coils for the 12a, am i wrong or is direct fire the next step

REVHED

It sounds like this "mechanic" has absolutely no idea what he's talking about.

H4Inf

heh ^ im with him on that.
decelerating = no load = nothing to ping

Siraniko

iTrader: (13)

Remove all the belts. install one, then rev it. then do the next one. thats will tell you exactly where the noise is coming from.

Kentetsu

Pinging occurs only under heavy loads, not while decelerating. If a belt is making the noise, usually it will only be when you hit high rpms (again, not while decelerating). Could the noise be described as a "honking" sound? Could be the butterfly valve thingy.

Oh, and don't EVER take your car to that mechanic again. And tell him that people all around the world think he's a stupid ***....

bliffle

Spray a little WD40 on your belts, one at a time, until you find the one that is squeaking. The WD40 won't hurt the belts but will silence them (in fact, a silently slipping belt will last longer than a noisy one).

It's probably the innermost belt which is for the alternator. If you have to replace it (might as well, they're cheap and they DO break eventually), you have to loosen the other belt tensioners, then slip the new alt belt over the fan blades then work it past the other belts one at a time, then re-tension all belts.

That mechanic is weird.

B

Kentetsu

Or you can pick up a spray can of "belt dressing" which might help it grip and stop slipping. Slipping belts is never a good thing.

Siraniko

iTrader: (13)

Good one!

DwArF

When I tach my car out it sounds like I have a turbo too.