Timing advance

[fourwheelininajeep]

I have bumped the timing all the way to the head and like it but I have seriously considered taking off timing cover and jumping a tooth. Would this be a good idea for a dd that I use to pull 10000 pounds mainly in the summer. I see high egts and want to try and get them down with still improving fuel mileage and power. The way I understand it more advanced on timing the more high end power and boost but lower egts and is this a good idea if reliability is improtant?

[Richie O]

Towing and more then an 1/8 inch timing increase is not a great thing. If you lug the motor it could crack the pistions. Keep the revs up and I guess its ok.

[PToombs]

You don't say what other mods are done to the truck. From the sounds of it, an Intercooler should be the next thing you do, then an upgraded turbo.

[dpuckett]

I would say put a dial indicator on it and time it to 1.4-1.6mm, maybe 1.7mm, but no more. If you are having EGT issues, I'd agree with Pete, an intercooler and/or turbo upgrade is the next step. Too much timing will do the same thing as too little timing- poor MPG, poor performance, along with increased cylinder pressures.

For what it's worth, I had a nonIC 91 with a PDR HX35 that I towed with a couple times, and as long as I kept the RPMs up and my foot out of it (no flooring it at 50 up a hill to see how low an RPM I'd peg the boost gauge), EGTs werent bad.