Hey All

Just gong over a situation regarding changing fuel Nitro content VS blowing plugs.

here is something i posted to a friend that was asking the question ....

When you up your nitro content you MUST shim to suit or you will blow plugs. You should add 0.1 mm of shimming at least for 30% nitro from standard.

Reason being is the plug gets hammered by the extra nitro content and higher impact explosion in such a small gap ..

Please let your friends know to re shim and re tune when you change fuels .

General rule for turbo and non turbo 21 to 30 size engines

20% nitro 0.3 to 0.4 mm med to hot plug
25% nitro 0.4 to 0.6 mm med plug
30% nitro 0.6 to 0.8 mm Med to cold plug

You also need to use a colder plug with high nitro , hot plugs get fried on high nitro because they have thinner elements .


Hope this info helps

www.massivemods.com.au

Mark DeBerard