hey guys ive read that when u use nitrous that u have to get colder plugs,is this true?if so were do u get them at? and how will i know which ones to get?

 

Depending on the hit colder plugs may be needed. Colder is the temp that the plug retains during the time it is not firing. Numbers are specific to the plug manufacturer but Delco plugs get hotter as the numbers increase. More important than the heat range is if it is projected tip or standard tip. Projected tip plugs have no place in a sprayed motor. Also I am sure you know that platnum plugs should not be considered in your choice as well. So when you are choosing your plugs take all of this into account. But keep in mind that changing heat range or style of plug will affect the way the car runs on spray but it might also adversly affect the driveability of the vehicle while off the bottle.
Josh,
J.S. Performance
215-783-4645

 

i will be running a 75 shot sometimes like at the track a 100 shot. so what plug should i get as part number wise?

 

I would run the stock heat range plugs with a timing retard, but make sure they are non projected and are copper like mentioned above.

 

i use ac delco plugs the $1.19 dont know if they are copper never paid attention to that

 

Why not projected tips? Are they more detonation-prone?

 

yeap. The longer tip has a tendancy to hold in heat and can actually glow or in some cases melt when using nitrous.

 

The projected tip thing is mostly a rumor… it might be an issue if you’re running 400hp worth of spray, but almost no one is.

Real world, the heat range determines how much heat the tip holds in… a projected tip of the same heat range will not get hotter then a standard tip with the same heat range under most conditions. Projected vs non projected is determined mostly by the chamber design… and in some cases could actually result in less propensity to detonation.

If you want some interesting info (and surprisingly competent answers and interesting recommendations) try calling NGK’s tech support number, they seem to have some of the more knowledgeable bunch of gearheads answering their phones. Another telling thing is that at least NGK and Autolite now offer projected tip race plugs right down to their coolest heat range…