Antracer88
Member
Building a flathead and was wondering about spark plug indexing any info is appreciated a question I have is which way should the plug be in when it’s inside the engine does it matter what the end is pointing to?
Your recommendation is to use a very hot plug with a 3/8 reach for gas and a very cold plug with a 1/2 inch reach for methanol? Interesting. If you set up your cam correctly with the proper valve springs indexing is absolutely needed for all plugs with a wire electrode.Gas or alky? gas autolite 458,alky autolite 411 as Flattop stated shouldn't be a problem with stock lift.
I find it strange that everybody seems to think that alcohol runs cooler than gas. How can that be? Alcohol, if run properly, makes more horsepower than gas. How can it do that if the temperature in the combustion chamber is lower?
Could you give me some references, that I might read up on this thing you're talking about? And thank you.Al,
I believe that the amount of power an engine can produce is based on the *delta* in temperature in the combustion chamber between the fresh charge and the amount of heat/energy produced in combustion, as well as the total BTUs created from combustion. It's not an absolute temperature thing. Methanol can show a lower EGT number than gasoline, yet still produce more power/work.
I only see one oxygen atom in all of these components. I didn't find a picture ofTo add to above posts, the heat required to evaporate methanol is greater, resulting in a colder, denser charge entering the cylinder.
More dense equals more oxygen molecules in the cylinder.
Also, burns slower, so more timing is required.