I haven't done anything more to my Expy in quite some time but my boat is another story! Talk about a place where big HP is, well BIG. Get hooked on power in the marine world and see how far you can go and how much you can spend, quick!!

This isn't specific to Chip's but it's about the best reading I've found on some basic's that will help so many people understand some of the impacts of "tuning" as well as how octane ratings play a part and maybe explain why leaving tuning to the pro's is sometimes best with our highly advanced cars and trucks these days.


Read this on "Detonation" and "Pre-ignition" (Lesson #1, YES, they are different) and prepare to be enlightened!

I hope you find this helpful!

 

Thanks for sharing. Good information and it does shed some light on an interesting topic.

 

Excellent article. Many confuse detonation and pre-ignition, and I don't know how many times I've heard the term pre-detonation.



There is one point I question, which is the statement that peak pressure should always happens at 14 degrees after TDC. Though this is still debated to some extent, rod ratios and other factors will influence this.

 

I didn't read the entire article, the link didn't work directly (for me, for some reason), so I went to the site and just looked it up & took a quick glance. Some of it was indeed useful information, there are several forms of detonation/improperly controlled combustion to be sure, of which pre-ignition is only 1.

Also, not all detonation is audible, something many people do not realize.

Like Signmaster, I also do not agree with 14 degrees ATDC always being the absolute optimal "time" of peak cylinder pressure in all situations, as various rod/stroke ratios & wrist pin placements in the piston can indeed affect this.

All in all, a helpful article, thanks to Family Ride for posting!