18* timing...lost power!

brushpuller

brushpuller

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Nov 30, 2008
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I have a 96 12v 5 speed with a 215 pump. It is stock except for the stock fuel plate slid forword, AFC adj., open air cleaner and strait pipe. I advanced the timing to 18*( factory it was at 9* but the tag said 12.5) After a test drive, then hooked up the trailer with a load...she lost a BUNCH of power!!! What gives with that? Im thinkn, set the timing back down to around 10* or so to get my power back because it towed GREAT when the timing was a 9*... Any thoughts?
 
you lost low end power... and you have no top end power because you still have the stock governor springs... I'd set it around 14* if you're not going to do a GSK
 
check it again and make shure it didnt slip. get a new lockwasher from cummins. my timing slipped all the time untill i got a new lockwasher.

after you retime your truck 3-4 different times the lockwasher pays for itself
 
if you go from 9* to 18*, the truck is going to feel like a slug at lower RPM compared to how it did before.

optimal injection timing depends on the powerband you're trying to utilize

if you had a 4K GSK in there, you would be singing praises at how much better the truck runs above 2000rpm
 
kinda off topic but will the cummins motor run at 4*? when i had my truck taken to cummins to be retimed the guy said it was at 4*, it was running but very very poorly
 
I see...So you think around 14* timing would be good for a low end truck, or maybe lower then that...say 10*... I am planning on a #10 plate...would that make any difference in where to put the timing?

I did put a new lock washer on when i did the timing. Also rechecked the timing for slip...it didn't!
 
Timing was the only change? Sure the governor arm isn't hanging?
 
Smokem said:
Timing was the only change? Sure the governor arm isn't hanging?
Click to expand...

Yes timing was the only changed/touched. It does feel just like forest said, i lost ALL my bottom end! The truck is a tow rig only and it run great(for towing) before the timing change.
 
I'd leave it at 18* and put in some 4k springs... takes about the same amount of time but runs way better.
 
YOUNG GUNS15 said:
kinda off topic but will the cummins motor run at 4*? when i had my truck taken to cummins to be retimed the guy said it was at 4*, it was running but very very poorly
Click to expand...

I slipped timing (once) and it was 1/2 round on the crank off, luckly it was a short drive home cause it wouldn't get over 1100 RPM's.

Jim
 
I run a lot of trucks @ 15°, good balance if high RPM is not desired.
 
Ok guys...thanks for the help!!! How hard is it to pul GS in with the pump on/still in the truck...i looked it over and it don't look good????
 
Last edited:
It's easy, needle nose pliers and some patience


(beer might help with the nerves)
 
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