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.

 

Alignment went just like everything goes, slow and painful but I think I I have the rear in a happy place now with right about 3deg camber and just over 1mm toe-in, both wheels pretty identically pointed along the body centerline. Yay. The plan is start very neutral on toe or 0 to slightly minus in the rear and 0 to slightly out in the front. Camber I need tire temp data to know the the right numbers, but there are right numbers to get tire temps even across the width.....toe is sort of a feel thing so near 0 until I know how it feels.
It took about 4 hours to figure out how I wanted to measure everything without buying anything and then get the measurements I was after. Camber was quick, just add about 1/3 deg on the right but toe started out at about 14mm toe-in and shims had no effect because the toe slots I put in the upper a-arm frame mount were in....I won't say the wrong direction but an unhelpful direction. So upper a-arms off, and grind 3mm in the other direction. Recheck and find toe's nothing like it was...but I got it. Front tomorrow I guess and hopefully it goes a bit quicker.
Oh, rebled the the rear brakes while the wheels were off......I saw near 0 air. I'll do the front tomorrow and it there is no air there I guess raise the pedal a bit, I can't have it go to the floor on a hard stop.

 

That's Scott not me, I prefer to just jump in without really thinking it through and deal with a consequences later

The whole conversation was really just how do you figure out what size (ID) flow meter will work best and how do you compare flows from 2 cylinders that are happening at slightly different times because each cylinder is on its intake stroke at a slightly different time. Then Scott and I go in different different directions with Scott pondering how to get perfect data and me pondering how do I make it good enough to use? That is all this was, nothing too scary really

 

Come on, we've been saying that for at least 10 years, and Mark's still got that Lincoln V12 under the bench - there's still years of fun ahead...
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Anyone get the plate on that bus!