Main spark Table crane 284

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jon
Posts: 71
Joined: Fri Oct 12, 2012 7:01 pm
cars: VN calais 5L
VX SS
Location: Hoppers Crossing (Victoria)

Main spark Table crane 284

Post by jon »

I pasted the spark table from an early 284 cam tune from this site into my $12p tune and noticed a few things that seemed a little odd to me. The table is commanding 40 deg under real light acceleration or deceleration and only a maximum of 25 deg under full throttle at 4800 rpm. I would have thought the 284 cam would have liked closer to 32 deg at WOT and and alot less advance very little pedal down? Am I getting this wrong?
The tune that I pinched the spark table from only went to 4800 rpm, thats why the rest of the table is still 20.04. I will change this later once I get my head around understanding this table.
Jon
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charlay86
Posts: 584
Joined: Thu Sep 17, 2009 2:00 pm
cars: VT S1 SS (L67)
Location: Perth, WA

Re: Main spark Table crane 284

Post by charlay86 »

you can run a lot more advance under light load conditions due to the lower charge density producing a lower peak combustion pressure.
less fuel + air = less bang = lower chance of detonation
jon
Posts: 71
Joined: Fri Oct 12, 2012 7:01 pm
cars: VN calais 5L
VX SS
Location: Hoppers Crossing (Victoria)

Re: Main spark Table crane 284

Post by jon »

That makes sense. :thumbup:
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