Timing from 12,5* to 20*?

Im running an Oringed head and 20 over gasket with new HB torqued down to 145. When i did the gasket and new ported head, i used moly lube on the top shoulder on the bolt and not on the threads. Worked very well for me and didnt having any thread pulling or bolt stretching and everythings been holding great at 27* of timing!
Granted this is on the toy and i dont DD it but i wouldnt go that high for reliabilties sake. Thes things like 16.5-17* for good overall mileage and power. Its a good middle point.
 
Do you guys consider 140 warm? or wait till 170ish? Mine never goes much past 170-180 anyhow.
 
140 is cold, technically, 170 is too, but I've never seen 170 on my truck and it's still running just fine.
 
i wait till i see the T-stat open up once.... then bag away... least i know it's got warm enough by then.
 
Good thread. I am back and forth on increasing my timing on the drag truck. At 21 degrees now. Just need to start playing with it.
 
im running 25* on my fresh engine... i have a different bowl though and we are messing around with it... i have studs only on my engine and i wasnt going to do them until they were given to me... i have a set of marine head bolts that i will be selling here in the future they are stronger than the factory head bolts at 12.9 on the grade which is the strongest bolts you can buy.... i was going to run them with my large singe and i was aiming at 70+ psi... my head and block match perfectly....

if keating machining can make 1600hp with head bolts then game on... i have yet to blow a head gasket and i was running 65psi before doing the engine overhaul
 
Stock untouched head bolts and 73-75psi here. Although I always do something I read a long time ago on DTR. Nothing above 8 psi until it's at operating temperature. However I am on stock or close to stock timing, I've really got to fix that...

-Dustin-
 
I ended up now on 20* timing and torqued down my headbolts to 150ftlbs.
Not one bolt did stretch so i will be good to go once my injectors arrive.
 
Im going to 18* today and gonna go 140 in 10lb increments today. Hope they hold till I can get the bigger bolts :eek:
 
FYI everyone, the harbor freight torque wrench can be off as much as 8lbs. Get a quality wrench that isnt maxing out at 145 LOL
 
YOUNG GUNS15 said:
FYI everyone, the harbor freight torque wrench can be off as much as 8lbs. Get a quality wrench that isnt maxing out at 145 LOL
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I used a Harbor Freight torque wrench on my 95' Junker, you just go till it clicks on the highest setting and then add another 10-15* of torque angle!!!!
 
I found a good one on my work that was calibrated and it was good for 300nm. Guess where that one is right now=)
 
i used my canadian tire "mastercraft" 1/2" last night........ managed to snap 2 bolts in half set @ 35 ft/lbs..... me thinky it's dumpster time
 
I have a 190 t-stat and still never get over 180... No fan either. Speaking of t-stats have you guys ever seen a Cummins T-stat that the flange is 1/4 of an inch smaller than a stock one and does not take up all of the space in the housing? I had to use form a gasket to get it to stay in the middle of the housing... Think I should bump my timing up a bit more from 18*? I have studs and o-rings with 5x16 injectors at 280 bar. I was reading somewhere that for every 10 bar past 240 (stock pop) that it retards timing by 1*? so it's like I'm only running 14...
 
i havent gone as high as some but i bumped mine to 19 on old retorqued head bolts on my daily driver(when i had them) and at 50 psi the head gasket held for a while until i upped the boost too much and popped it. My truck runs mostly on the highway so i can really only speak from that point of view. Getting on the on ramp and rolling into it i can tell theres quite a difference and throttle response was improved. At idle it even sounds different which is pretty cool
 
Kickaha said:
I have a 190 t-stat and still never get over 180... No fan either. Speaking of t-stats have you guys ever seen a Cummins T-stat that the flange is 1/4 of an inch smaller than a stock one and does not take up all of the space in the housing? I had to use form a gasket to get it to stay in the middle of the housing... Think I should bump my timing up a bit more from 18*? I have studs and o-rings with 5x16 injectors at 280 bar. I was reading somewhere that for every 10 bar past 240 (stock pop) that it retards timing by 1*? so it's like I'm only running 14...
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I want to know if thats true too. In essence that would allow you to run more timing right?
 
Pop does affect actual timing but I have never heard it was that much and I doubt it is.

If thats true my timing is around 8* right now. :eek:

With mine at 280bar and wide spray angle I have still been told to keep it under 18 so it stays in the bowl. So since im up 40bar over stock I would have to run 17 to return timing to stock and I would have been told to run 22 to keep it in the bowl. So again, I doubt thats true.
 
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It seems like it just needs more timing with the higher pop's. So if I was still running stock 240 pop's 18* would be great but with the 280s it's only at 14*. I had no problems starting in the cold with it at 18*. Might be I'll give 22 a try and see how I like it. Anyone have a better spot to put the timing at?
 
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