StarScreaM2k1

Okie so a little bit of background info. 88 10th Ann T2. Rebuilt motor, approx 2500KMs on it. Hybrid S5 Turbo, Streetported and All new seals and gaskets. No emissions, 550 pri, 720 sec with Walbro 255LPH Pump, Rtek 1.7 Baseline and E-manage for finetuning (not installed yet (one of many projects over the winter)).

So heres the few questions i got

1. I got a Crane Hi-6 Ignition Box. I understand how to set it up and all that but first how do i TEST to make sure its connected properly and working? I dont wanna mess up the motor by pulling off the leading coil plug boot going to the coil and seeing if theres spark while the engine is on (aint that gonna be bad?). any other methods to test, or tell me the proper way to test.

2. If i have the ignition box, does that mean my risk for Detonation goes up with it? I mean i have more fuel, but i want a stronger/better spark so i dont have ignition breakup higher in the RPMs and to have a more complete combustion.
Wont it be more risk since i have a better spark? Anyone shed somelight on this and situations/possibilties/thoughts/experiences?

Sideways7

iTrader: (7)

I wouldn't think an ignition box would raise the chances of detonation. Detonation is from the fuel mixture spontaneously combusting due to heat (or whatever) before the spark is fired, so a stronger spark shouldn't effect detonation.

NZ_87_TURBO

^^ exactly right. your stronger spark will in no way increase detonation ( the wrong type ) and cause engine damage. dont confuse this with leaning out tho.
high air and fuel temps, combined with pressure is what cases detonation. but dont forget that anyone of these ( bar high fuel temps i believe ) can cause detonation.
hot air expands thus creating more pressure, this increase with turbo induced boost pressure = more pressure than the ecu anticipated for and can cause spontainious combustion and detonation. ( basially starts acting like a deisel engine haha )

can you see how your HI-6 can have nothing to do with it?

StarScreaM2k1

i think i understand what you mean, not entirely i kinda get the understanding of it.

ScuttleRX

Detonation is when the fuel mixture ignites too early wihtout the need of a spark (I think!) and as post above said caused by the high air temps, pressure, etc. So having a better spark wont cause it as its meant to be igniting when the spark is sparking, lol, is that about right?

anewconvert

iTrader: (1)

Ummm... no.


Pre-ignition is what you are describing. that is the fuel ignited on its own before a spark was introduced. It has nothing directly to do with the fact that the air is taking up more volume. Fuel has a tempurature at which it auto-ignites. As you compress the intake charge its temp climbs dramtically. If you throw hot air into the engine, then compress it there is less room for it to heat up before it spontaneously ignites. Intercoolers are designed to cool down the intake charge, which has the added benefit of packing more oxygen per unit of volume, keeping the air/fuel mixture below the auto-ignition threshold until the spark lights it off.

Detonation is where a seperate flame front starts after the fuel has been ignited by the spark plug. This can be caused by a glowing piece of carbon in the combustion chamber, uneven burn in the combustion chamber dramatically raising pressures to the point of auto-ignition, or hot spots on the combustion chamber that cause the a/f mixture to ignite. The difference is that the engine had already started to burn the a/f misture and a second flame front occured for whatever reason.


BC

Sideways7

iTrader: (7)

Wow, I can't believe I had it mixed up. Anyway, andrewconvert it right: http://en.wikipedia.org/wiki/Detonat...bustion_engine
So I'm not really sure whether the better ignition will help prevent detonation, but it still shouldn't make it worse.

arghx

iTrader: (3)

if your HI-6 box is anything like my MSD 6A, the car won't run if you don't have it installed right. You won't get any spark.

RotaryEvolution

iTrader: (30)

no it will not hurt nor will it help combat pre-ignition or detonation.


detonation is just a common term used around here when engines blow, i haven't actually seen any scientifical proof as to which the issue is that kills these motors. in my opinion it is pre-ignition though that term is hardly used to describe failures due to knock from the result of high intake temps, high boost levels and less than desirable fuel octane.