|07-17-2012 10:29 AM|
Thank you everyone for the very helpful information. I was shopping for spark plugs on Summit and the website gave the option of projected or non-projected. spark plugs. Having never been asked that before, I thought I'd play it safe and ask first.
|07-17-2012 10:02 AM|
|1971BB427||Older hi performance engines with higher compression ratios ran hotter plugs with exposed or extended tips. They were designed to run those plugs and work well with them. You can't get more hp or better performance by just tossing in a plug with a certain length electrode. You need to stick with the plug that works with your engine stock, or with whatever mods were done to that engine.|
|07-16-2012 08:29 PM|
high compression engines
My dealing with spark plugs revolve around whether or not the piston hits them and mashes them closed. In high compression (racing engines), the piston dome can hit the plug. So two ways of stopping this is indexing the plugs or go to non protruding.
|07-16-2012 07:29 PM|
NGK Spark Plugs (my personal preference, BTW) has a bit of a blurb on spark plug design.
|07-16-2012 07:04 PM|
Spark Plugs: Projected vs Non-Projected Tip
I have a general question regarding spark plugs. What is the difference between projected and non-projected tip spark plugs? The only info I've been able to find is that people use the non-projected in the forced induction applications. So for normal daily drivers, should I just use projected? (a bone-stock 350 in a truck in this case).
Thanks in advance