Out of curiousity, what does detonation sound like. I'm just trying to judge how much advance it can go before it does that. Just out of curiousity

 

you will know when you hear it it sounds like ***. like marbles in a can right next to your ear.

 

a piston engine will make a ping noise, a rotary will make something a lot weirder, also keep in mind that you wont be able to hear it at high rpm and high throttle.

stock dizzy with the vacuum hooked up runs about 35 degrees cruising, and 20at wot. its in the fsm, so start there

 

it sounds like a nut working loose in the exhaust manifold on a non turbo, on a turbo its is much much worse sounding.

v/r

Kenn

 

Here in Australia with RHD RX7's it sounds like a bunch of CD cases rattling around in your glove compartment.

In the US with LHD versions I'd suggest it'd sound like some loose CD cases rattling around inside your dash

 

Marbles rattling around in a tin coffee can...

 

Alright thanks guys. I think that I've been experiencing it then. at first I though it was my new muffler rattling around on the body, but upon further investigation, it wasn't really coming from where I wanted.

This is running with a second gen CAS and MS.

Sam

 

another vote for the marbles rolling around in a can

 

Marbles ANGRY marbles that hate your engine.

 

It sounds like 2500 to 5000 Sackajewa dollars falling out of your pocket.

 

My dads ford f-150 v8 sounds like marbles in the cat. He says its prob just a bad cat and i always thought that too. Since we have had this truck it ran fine and still does, but the check engine light will not go off. A dianosics test showed one of 4 o2 sensors bad. This o2 sensor was on the right side and the noise is from the left cat. But can a piston engine sound like this if detonated?

 

Second that!!

 

to me it sounded like someone hammered a mrable against my engine. it was the worst noise I've ever heard...

 

This is what I like about Canada.

The $1 coin (which we've had since '89) is called... (are you ready?) ... the Loonie.

Simple, straightforward, has a loon on the front, hence the name. It's a gold coloured coin and yeah I'd bet that detonation sounds like about three grand worth of loonies falling from your pocket (or $1500 worth of twonies, the $2 coin)

Jon

 

After that threadjack...

Sam don't you have a wideband with a gauge? or Datalogging capability?

Jon

 

mine sounds like an angry meatgrinder, a very angry meatgrinder......

 

imagine taking off in 1st gear with insufficient fuel pressure. same ****. you will hear fluttering or marbles, not pinging