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09-27-2018, 04:57 PM
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#1
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Name: TruckYou
Title: Diesel Enthusiast
Status: Not Here
Join Date: Dec 2016
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Posts: 132
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12v Max degree of injection timing
Finally finishing up the engine for my race truck... Once my runner intake shows up. Curious if someone can help me out with an estimate Max degrees if injection timing to keep the pattern in the bowl
Stock stroke
Large bowl 12v mahle pistons
Machine shop took .006 off the deck, and head
155* 5x25
With a .020 FR HG
13mm pump w/.093 lines
Looking for a starting point on where to time the pump, and a rough idea of Max timing before wiping out the rings
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09-27-2018, 05:32 PM
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#2
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Name: 95cummins5.9
Title: Old man ***** gossiper
Status: Not Here
Join Date: Jun 2012
Location: U.S.A
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Posts: 4,720
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Why worry about keeping the spray pattern in the bowl when you can use the whole damn cylinder?
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Quote:
Originally Posted by jfaulkner
puzzy, tune it.
I don't own anything stock, from engines to boobies I've modded them all. Life is too short to live with mediocre chit.
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09-27-2018, 08:29 PM
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#3
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Name: YoungDiesel27
Title: Never Enough Time
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Join Date: Jul 2010
Location: West Virginia
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Posts: 825
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Low to mid 30’s should work good.
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EFI Live, HP Tuners, Smarty custom tuning
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09-29-2018, 08:12 PM
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#4
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Name: 1995-12valve
Title: Rookie
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Join Date: Jul 2014
Location: East Tennessee
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What turbo setup?
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09-29-2018, 08:13 PM
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#5
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Name: 1995-12valve
Title: Rookie
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Join Date: Jul 2014
Location: East Tennessee
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Posts: 24
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Depending on how the injectors are setup I would say 30-32 degrees to stay in the bowl
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10-01-2018, 07:42 AM
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#6
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Name: YOUNG GUNS15
Title: Im AWESOME!!!!
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Join Date: Sep 2009
Location: Utah
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Posts: 7,346
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Max timing before having issues with the rings? Honestly just don’t touch the throttle when you’re starting it up for the first time. I would start at a MINIMUM of 25* max timing I’d say 38 ish for an all out power mode.
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__________________
Spence
-1994 4x4 12 valve 13mm, single 475 748/1292 Fuel 872/1470 N2O
-2005 4x4 12 valve CCSB 3rd gen '12-rail' 280hp
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10-03-2018, 01:19 PM
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#7
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Name: TruckYou
Title: Diesel Enthusiast
Status: Not Here
Join Date: Dec 2016
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Posts: 132
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Sorry for the delayed response. Thanks guys. The injectors are 5x25 155* 260 bar I believe, would have to check.
Current turbo setup is a S467.7 over S488
When "Max timing" is exceeded, meaning outside of the bowl, what is the indication you've exceeded. Incomplete combustion, and excessive smoke?
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10-03-2018, 02:20 PM
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#8
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Name: TruckYou
Title: Diesel Enthusiast
Status: Not Here
Join Date: Dec 2016
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Posts: 132
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290bar
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10-05-2018, 12:43 PM
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#9
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Name: gman99
Title: Diesel Enthusiast
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Join Date: Sep 2012
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Quote:
Originally Posted by TruckYou
Sorry for the delayed response. Thanks guys. The injectors are 5x25 155* 260 bar I believe, would have to check.
Current turbo setup is a S467.7 over S488
When "Max timing" is exceeded, meaning outside of the bowl, what is the indication you've exceeded. Incomplete combustion, and excessive smoke?
Sent from my Moto Z (2) using Tapatalk
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Melted bowl edges, lol. JK Excessive smoke and egt's is really the main indicator.
Just think of the old 370 injectors that guys used to run, smokey as hell and high egt for the power made. You should not have an issue with the marine pistons if you start in the mid twenties and work your way up based on how it's responding. If you street drive it once you get up around 30 your definitely giving up streetability and low end response for power up top. 26 to 28 should make more than enough power up top for the street.
__________________
98 QCLB 4x4 12V, ARP625+ Studs, 14mm mains NonIC pistons, Ported head, Marine Cam, Hamilton Pushrods and Tappets, BeeHive springs HE351cw over Billet S475, 4KGSK, 5X.018's, 7mm DV's, 24 Degrees Timing, 5" Exhaust, TCS Input, DPC Converter, Firepunk Competition Rebuild Kit
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10-06-2018, 07:20 AM
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#10
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Name: TruckYou
Title: Diesel Enthusiast
Status: Not Here
Join Date: Dec 2016
Member`s Gallery
Posts: 132
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Quote:
Originally Posted by gman99
Melted bowl edges, lol. JK Excessive smoke and egt's is really the main indicator.
Just think of the old 370 injectors that guys used to run, smokey as hell and high egt for the power made. You should not have an issue with the marine pistons if you start in the mid twenties and work your way up based on how it's responding. If you street drive it once you get up around 30 your definitely giving up streetability and low end response for power up top. 26 to 28 should make more than enough power up top for the street.
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Thanks Gman. This truck won't be on the street at all. Lol knock on wood, no melted bowl edges, I used Cerakotes "piston coat" on these mahle large bowl pistons for some insurance.
I appreciate the input guys. I'll start mid twenties, and work up. Just waiting on my Runner intake and lines from Joker, and can drill the head, torque it down, and break it in. Hopefully shows up soon, truck hasn't moved all season
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