bill Shurvinton

Errr no. Excess fuel will still cool things down (preventing the occurance) and leaning out towards stoich will make it more likely. Same effect, just more dramatic.

And pre-ignition is NOT detonation. one can lead to the other but they are different.

Pre-ignition: A hot spot causes the mixture to ignite early

Detonation: the burn goes from controlled to uncontrolled (read explosion, rather than flame front)

RETed

Hmmm...I dunno what this was in reference to.


Yes, the definition of detonation is uncontrolled combustion, right?
Using the old square versus rectangle logic, pre-ignition is detonation but not vice versa?



-Ted

bill Shurvinton

You can have pre-ignition without detonation. Its often referred to as pinking in the piston world. In extremis the pre-ignition can cause detonation, but you can also have detonation without pre-ignition.

chairchild

So, for all rednecks out there:

Pre-ignition = pop

detonation = pop

normal = purrrrrrrrrr



Bill, pinking is what we say instead of pinging in the UK. And as you said, it means the same as pre-ignition, it's just shorter to write!

RETed

When I hear the word "pinking" I think of pinking scissors.
How many of you guys know what that is???
Yes, I'm secure with my feminine side.


-Ted

MountainTurbo

That's probably more information than ANY of us wanted...

-=scad=-

i just bought a 90 rx7 GTU and i am running lean how can i fix that?


-=scad=-

DerangedHermit

^^ What he asked.

jeremy

iTrader: (1)

no, all you guys are wrong. when the motor starts running lean, the hamster gets too thin to keep traction on the shaft. at this point power output starts going down and the friction from his feet slipping helps the egt's rise. if this continues, you'll blow the hamster. of course the easy fix to this is a concoction of atf, mmo, and whiskey. also run one tank of E85 with a 3point octane booster.

DerangedHermit

Can I get that in English?

jeremy

iTrader: (1)

sorry, i'm american. only thing i can tell you is not to put it in the boot.

DerangedHermit

I'm American also... Hence the Knoxville, TN (YES, tennesseeans ARE Americans )

However, I am basically a newb. So the whole hamster thing lost me...

Anyone with a better explanation?

jeremy

iTrader: (1)

first, how do you know you are running lean. s5's are known for running rich. i know mine does.

Rotor_rampage

i have a 90 tII and mine i sware runs toorich,cuz when shes cold until warm up it runs perfect.but when it gets hot it starts to bog just a tad bit if im just sitting reving it. but then i look at the end of my turbo at night its a light red like it is running a little hot in the exhaust... new down pipe so thats not it , after the down pipe no cats. so theres nothing holding the heat in??????? i am going crazy trying to get to the bottom of the problem for weeks still drive it too. just cant figure it out , dont want it to hurt my low mile engine eather... i only have origianal 73,000...on it im wondering maybe tuneup or is it my oxygen sensor took a **** from to much heat??? or will to hot melt my turbine finns on the inside of my turbo ?? hope not please someone help soon dont want to hurt anything .....................

Rotor_rampage

i have a 90 tII and mine i sware runs toorich,cuz when shes cold until warm up it runs perfect.but when it gets hot it starts to bog just a tad bit if im just sitting reving it. but then i look at the end of my turbo at night its a light red like it is running a little hot in the exhaust... new down pipe so thats not it , after the down pipe no cats. so ther

jeremy

iTrader: (1)

you ever installed any gauges? a/f gauge, boost gauge, etc, so you know whats going on? i don't have a turbo so i'm not dead sure whats normal and whats not. thats the best i have for you.

JunpoweR

iTrader: (1)

ok
#1 LEAN in conbustion terms more air than fuel..kinda like ur engine took a diet eating more air than fuel.when the fuel mixture is lean it burns faster,before the exhaust cycle is reached..Usually we would want the exhaust to fully combust right after the port opens up..this happens when the fuel mixture is perfect..not rich or not lean..when lean it will burn before the exhaust ports open up and causes excess heat to stay inside the motor..and putting more HEAT and Pressure on the apex seals and other engine components..
Usually it will warp ur apex seals or even crack the housings..depending on how much you lean out and how long you run it that way..usually the results of a lean mixture are deadly to the motor..