4.0L HO Jeep Engine Build
Note how far the plug tip is in the chamber! Yes, these are the correct plugs for the application. Although I can imagine that a tip that far out in the chamber would lead to less emmisions and a more complete burn, I wonder if this is why these engines tend to have detonation problems under high loads like towing. Technically, the flame front should be smaller with a centrally located spark but I bet that tip gets hot man. I'm going to check to see if a colder plug is availible.
The next picture shows my set-up right before cc'ng the chambers. They all came out to 59 cc + or - a half a cc.
Note how far the plug tip is in the chamber! Yes, these are the correct plugs for the application. Although I can imagine that a tip that far out in the chamber would lead to less emmisions and a more complete burn, I wonder if this is why these engines tend to have detonation problems under high loads like towing. Technically, the flame front should be smaller with a centrally located spark but I bet that tip gets hot man. I'm going to check to see if a colder plug is availible.
The next picture shows my set-up right before cc'ng the chambers. They all came out to 59 cc + or - a half a cc.