Dyno'ed My 360..it's a pig..what next?
Whatcha hearing? it doesn't sound right that's for sure
It's not only what I hear, but also what I don't hear, and what I see/don't see.
The missfires are obvious. But I don't hear a rap in the pipe, and I don't hear a power surge.And I don't see the engine straining in the straps or relaxing when he lifts.
I hear several things, the most blatant of which is missfires, quite a few of them, not only at WOT, but also before. Missfires eat power,cuz not only do you lose the power of that cylinder, now the others have to drag it along. And then there's the disruption in the exhaust. The slug of unburned A/F may light up in the pipe, driving the hot expanding gasses in two directions, up and down the pipe.This totally messes up the scavenge cycle for the next event, but worse, can drive exhaust back into the intake during overlap. When the slug gets into the merge it messes up some to several following scavenge cycles for other cylinders.
Next is the rate of engine acceleration. I can not see the graph, but am guessing the hammer fell around mid 3000.
The first thing that happened was the engine stumbled from lack of pumpshot, and it struggled for a bit. Then it sloooowly started building revs.(Which granted could partly be due to hi-way gears) Then it started missing and you can clearly hear it get lean in the pipes.A couple of times it seems like the rate of acceleration actually slows before picking up again. That means the engine had to accelerate the rollers up to speed again.
Finally look at the chassis straining on the straps,not. She's way down on power.
The rate of engine acceleration remains pretty much the same to what sounds like a premature shut-down. So I can't hear the cam in there. Sure it has a bit of lope at lower rpm, but there's no surge at the top.
So, it's not only what I hear, but also what I don't hear.
The first thing I'd look at is the coast-down graph to see how much power is getting sucked up in the rest of the powertrain.I mean maybe the tranny is dragging or the rear is set up too tight, or the brakes are engaged. Or everything is overfilled with fluid, ot the U-joints are seized,lol..
Then next is a cylinder pressure. You need more than 145ish to put some rap in the pipes.You need 160 or more to be "hot". With aluminum heads 200 is doable but a better target IMO is 185.
And the A/F you already know about.
Of course the cylinder pressure and ICA need to be well co-ordinated. And above all, don't change a thing until you know what you got. You can't set a destination until you know your current location.
