Boost -A- Spark

[interceptor]

Any one heard of this or is using this product?

 

[Defiant]

No. But the ignition is far from being a weak point in the DSM.

 

[Talon ESI-T]

The inition gets weak in a 420a during high boost applications (15PSI +). We usually get away with sizing the gap down to .32 or .28.

Terry

 

[Defiant]

Turbo's stock gap is .028. Surely you're not trying to run NA gap on a blown motor.

 

[Talon ESI-T]

Defiant, i have no idea what your talking about.

This is the 420a section which is n/a motor (I know, you know that). The spark gap spec for this motor is .044. So naturally when people build a low compression motor they still run the 044 gap. you either need to install a more intense coil of spark cd box. The alternative is to mock the 4g63 platform and drop the gap to 028. THIS DOES NOT ALWAYS SOLVE THE ISSUE. the 420a Coil is not as potent as the 4g63 coil.

I am one of the poeple where 028 doent work as well as expected. I have 1 range cooler plugs and gap is set at 028. I have an MSD coil as well. If you look at my dyno graph, the second run blew the spark out around 4k-4.5k.

Now keep in mind this guy has not lead up to believe he has a low compression motor. in fact he is posting in the bolt on section which if he has taken that into account leads us to believe he is running N/A.

Terry

 

[TalonESIT]

Defiant, i have no idea what your talking about.

This is the 420a section which is n/a motor (I know, you know that). The spark gap spec for this motor is .044. So naturally when people build a low compression motor they still run the 044 gap. you either need to install a more intense coil of spark cd box. The alternative is to mock the 4g63 platform and drop the gap to 028. THIS DOES NOT ALWAYS SOLVE THE ISSUE. the 420a Coil is not as potent as the 4g63 coil.

Terry

VERY infomative! Thanks for the info Terry, I didn't know about this...

 

[Defiant]

The combustion chamber doesn't care what block it's in. It does care about having a pressurized intake feeding it, whether it was built to be a turbo or not. The higher cylinder pressures will call for a narrower gap because air's electrical resistance rises as it is compressed.

naturally when people build a low compression motor they still run the 044 gap.

Are you telling me that closing down the spark gap isn't part and parcel of a turbo conversion? I'm very surprised to hear this. The "low compression" goes out the window when forced induction comes in.

 

[VelocitàPaola]

Are you telling me that closing down the spark gap isn't part and parcel of a turbo conversion? I'm very surprised to hear this. The "low compression" goes out the window when forced induction comes in.

Yeah... it makes sense, but it isn't apart of the standard turbo conversion procedure. The only thing we really hear is to get new plugs one range colder than stock.

 

[Talon ESI-T]

The combustion chamber doesn't care what block it's in. It does care about having a pressurized intake feeding it, whether it was built to be a turbo or not. The higher cylinder pressures will call for a narrower gap because air's electrical resistance rises as it is compressed.

Are you telling me that closing down the spark gap isn't part and parcel of a turbo conversion? I'm very surprised to hear this. The "low compression" goes out the window when forced induction comes in.

Exactly. Its the most basic overlooked issue when these motors are turboed. Most people dont run more than 10 psi so its never really noticed. The same goes for the PCV system.

Terry