1995 Classic Timing
#1
1995 Classic Timing
Quick question regarding base timing and advance on 3.9 in a 95 Range Rover Classic.
Why are the timing and advance so conservative? In my experience base idle timing can be anywhere from 5-10 degrees and increases with engine speed to 20 or more. The Service Manual specs call out a base idle timing of 5 degrees with a max advance of 8.5 at 2200.
Very curious to learn why this is? Thanks.
Why are the timing and advance so conservative? In my experience base idle timing can be anywhere from 5-10 degrees and increases with engine speed to 20 or more. The Service Manual specs call out a base idle timing of 5 degrees with a max advance of 8.5 at 2200.
Very curious to learn why this is? Thanks.
#2
I suppose when all the engine parts are new the 5 degree mark may be fine...but as things wear some the base timing may need to be closer to the 10 degree mark.....thats a common old V8 trait. I use the old trial and error method of timing the older engines..keep advancing the timing a little bit at a time untill you get spark knock when you are under accelleration...then back it off some to the sweet spot.....a lot of these will be around 9 degrees if you feel the need to measure it.
one note of minor concern >>>you will notice that as you advance the timing the engine idle speed will pick up, and at first the IACV will be able to compensate.....after a while it wont and you may be idling slightly faster than the the factory specs....which actually is no big deal, unless you are a 14CUX ecu.....then you throw a 48 code .....personal experience
one note of minor concern >>>you will notice that as you advance the timing the engine idle speed will pick up, and at first the IACV will be able to compensate.....after a while it wont and you may be idling slightly faster than the the factory specs....which actually is no big deal, unless you are a 14CUX ecu.....then you throw a 48 code .....personal experience
#3
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