Srigs

My 97 12V 4x4 CC Looong Box gets 18 to 20 in town, 22 (80+MPH) to 25 (70 MPH) on the Highway and 13 to 15 towing my gooseneck horse trailer. 8)

Got Smoke?

[quote author=dieseldel link=board=16;threadid=17382;start=0#163028 date=1058939588]<br><br> <br>According to my engine plate, should be 13.5 degrees advanced timing (215hp engine stock). hmmm. Guess I'll have to find someone to time it, it must have slipped back some.<br>I didn't know that could happen! :<br><br>-Del<br><br>[/quote]<br><br>If your going to get your engine timed first find out how the technician is going to do it. The correct way is using a dial indicator on the #1 delivery valve. Second, have them bump it to 15.5* or 16* BTDC. You can get the chart to help them set it off Piers website. www.piersdiesel.com in the technical section.<br><br>I had mine timed to 16* and picked up a solid 1.5mph at the pump. Of course my truck had like 130K on it at the time and timing had slipped from factory(13.5*) down to around 10 or 11* BTDC.

dieseldel

emjay, <br> Speaking of riceburners...<br>Some guy in a riceburner ran a stopsign and plowed into me broadside. Parts flew all over the road, destroyed his frontend and radiator.<br>All the damage it did to my truck is to scrape a little dirt off the outer dual tire. I almost got out of the way, need more power! what an excuse to bomb some more...heehee<br><br>Ok on timing, I'll ask the tech (if I can find one) how he intends to time it. <br>The only reservations I have on advancing timing:<br>When the diesel fuel detonates it always takes about the same time to build pressure. Its real fast, unlike gas.<br>So, if you advance a lot, you are holding ALL the pressure for some increased amount of time until the piston begins its downward descent. The piston head temp is going to be really a lot higher than with stock timing. Also, that pressure may stress the head gasket unduly.<br>With the big-truck Cummins upgrades they actually retard the timing. I guess this is comparing apples and oranges?<br>Anyway if 15.5-16 deg advance is safe, I note a lot of folks on here use considerable advanced timing, and don't see many problems, so I guess it may be safe.<br>Any comments?<br>-Del<br>

dieseldel

I found my power info on this truck.<br><br>HP = 350-360<br>Torque = 750-780 <br><br>No wonder I can slip my stock clutch if I'm not careful! <br>

Diesel_James

I was considering having the timing advanced on my truck. I would like to see an increase in fuel mileage. I was going to try a taller set of tires, something like a 255/85 16. The mechanic I talked with had told me that the taller tires would help, but if he advanced the timing there would be a decrease in torque which is needed to pull the taller tires. Any thoughts on this? It would seem like to me that there would still be sufficient torque to pull the tires but like I said, I'm shooting for an increase in fuel mileage. Thought you guys might be able to shed a little light on this.

dieseldel

The difference in torque between those tire sizes is not noticable. I run 265/85 16 tires and just can't tell, and I'm VERY sensitive to changes. The speedometer is off of course, but mine was factory calibrated for this tire size even though it came with 215/85 16's.<br>When advancing the timing, going too far decreases low-rpm torque and increases high-end torque from what I understand.<br>Some of the diesel mechanics here most likely can tell you just how much to advance it before it weakens the low-end.<br><br>Del<br>

kingofdodge7131

Yeah couple things to consider, where you drive and how much it is. If you live in a bigger city where you stop and go or anytihng like that the bigger tires might cost ya, even with the great low end we have. might not be noticable but neither will the gains as much, if you do a lot of open road 40 miles to work thing then it would be good. maybe you consider yourself $.02 richer now

Got Smoke?

Just wanted to add my $.02 gentlemen.<br><br>When I had my timing advanced I didn't notice ANY change at all. Just an increase at the pump. ;D

dieseldel

Hmmm. It doesn't seem like advancing to 16* should do that.<br>You should see a little better economy and more power at the high-end, from what I read.<br>Interesting. :<br>I guess if you drive at lower rpm typically (like me) there is not much advantage to far advanced timing. I'm no expert, though.<br>