SOI Advice

[AussieISX]

(01-24-2017 )Unilevers Wrote:  typically most trucks under heavy load run 1-3.5 in the SOI tables. A max (and slightly risky) would be 8 degrees BTDC total which would give you 4.5 on the increment to be there. Personally i would run the increment down to 2-3 to give you more of a safe margin and a total BTDC of 5ish.

if you are unsure of the driver and loads run a 0 increment to be on the safe side. a running engine is better than i blowed up efficient one.

my 0.02c

There is nothing slightly risky about running 8 degrees total in either 3774 or 2965 Cpl cals , As the stock cal peaks at 7.5 degrees @1650-1750 Rpm in the alpha 1 tables . That is why I said 8 degrees total advance . If he added the 2-3 degrees you advised he would have ended up with a total of 10.5 degrees. Just putting an incremental increase on these tables is bad in my opinion and they should be edited correctly . I think before giving advice you need to be familiar with the cal in question. I have trucks running in the north of Australia pulling 167,000 kg ( 368000lbs) on 24hr operations using the same timing I suggested. Those trucks are not owner driven and have been running this tune for nearly 2.5 years without any cracked Pistons or any problems outside of normal issues.