Rev Limiter

chrisellis · Post by **chrisellis** » Fri Jul 17, 2009 7:32 pm

I am running a Mallory 6AL and have a progressive limiter available but everyone and Mallory say you cannot use an aftermarket limiter with a CD system.

If the limiter clamps the coil neg what harm would this do to the control unit ?

I need to use the limiter for safety not driving to it so it should be rarely used.

Any ideas gratefuly recieved

Post by **katanaman** » Sat Jul 18, 2009 6:37 pm

The 6AL has its own built in limiter which you program via plug in chips. http://www.msdignition.com/Products/Ign ... ntrol.aspx or is it actually the 6 you have?

Post by **katanaman** » Sat Jul 18, 2009 6:39 pm

Meant to say yes CD ignitions can get damaged if you use a limiter after it. The limiter itself is unlikely to survive either since the MSD ignitions put out something like 50v as well.

chrisellis · Post by **chrisellis** » Sat Jul 18, 2009 8:36 pm

Sorry, it is a 6A not AL

So the unit must supply a pulsed + not grounding the - like normal systems, so I could lift the negative side of the coil with the limiter plus some electronics not creating any load on the Mallory unit.

Post by **katanaman** » Sun Jul 19, 2009 1:08 pm

You have kinda lost me here am afraid. CDI doesn't use the - of the car it has its own power supply so whether you mess with the + or the - you are interupting its power supply and this will damage the capacitors. It also doesn't matter if your on the + or the - 50V is 50V and your limiter will get damaged. CDI ignitions give a big fat spark but they are unfortunately pretty fragile. Lots of things damage them including simply pulling a plug lead off.

chrisellis · Post by **chrisellis** » Tue Jul 21, 2009 8:21 pm

katanaman wrote:You have kinda lost me here am afraid. CDI doesn't use the - of the car it has its own power supply so whether you mess with the + or the - you are interupting its power supply and this will damage the capacitors. It also doesn't matter if your on the + or the - 50V is 50V and your limiter will get damaged. CDI ignitions give a big fat spark but they are unfortunately pretty fragile. Lots of things damage them including simply pulling a plug lead off.

Understood, Thanks