V-12 Engine into 308 Build, over on Grassroots

Idle is 1000ish. I'm not concerned about measuring any 1 cylinder, I want to measure 2 at the same time and compare, ideally using the differential setting so adjust to 0 and move on. The cylders pulsing at differential times is the concern so I'm going to try and damp the pulses either with hose length or maybe by standing the meters off using a section of pvc pipe.....or maybe it will be fine

 

Ooo that is tricky... Phasing. Pick a cyl for reference, then it's the phasing between it and the others... Resonance and harmonic oscillations between them.. Yeah that's getting a touch beyond back of the envelope.
1k rpm
16.67hz for each cyl
12, cyl.. 60° events.. so 100hz between them.

 

Ugh, this just bugs..
Ok so a 100hz pulse is going to have a wavelength of 3.43m.. 1/4 wave resonator would be 85-86cm... But that's just for events at 60° Delta

So hopscotch from cyl to cyl in the firing order to keep the 60° phase. Seems simple enough...I think..

 

On the cylinder MAP readings I just run a rolling average in the code. I'm sure the meter has some damping i just don't know how much. The hose adds more damping. I could add a chamber to the hose, or pipe in top of the stack. Damping is the path I'm going to try 1st I think

 

• Image Unavailable, Please Login Record average is a setting, problem solved I'd guess.

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It averages over a 25 sec period?

 

It averages until you tell it to stop it think. There's min, max, average options.

 

Gotcha

 

I am with you I thought the build had strayed into string theory. . But then agin @mk e has been over my head the whole time. Makes a fun thread.