2056 rebuild part THREE, GOT Data? Log works 3 Options

[Cairo94507]

Good job getting this sorted Robert. (IMG:style_emoticons/default/popcorn[1].gif) (IMG:style_emoticons/default/beerchug.gif)

[technicalninja]

My first log....The last downward slope is the mains coming in at 35- 4500 rpm and look good at 13.2:1 and richening slightly (1.30)

I think I see the lean pop pop pop at 2-5 sec. (55 idle jets)

Here is an odd observation

While warming up the first light throttle up into the transitions feels smooth and no pops. try it again in a few seconds or another gear and is lean

Some times the ratios feel look good some times they are lean
I am going to have a helper watch my fuel pressure gauge on some next recordings

I did read somewhere that the fuel enricher (choke) gave some users problems rich or lean (not sure) that are not hooked up but the valves are in place.. I have seen dummy valves tap took off the ports (X4) with no holes.. 15-17 bucks each

I have richened the mains to overlap over the transition circuit and felt a little sluggish rich but not great numbers on the mains and WOT. But no lean hole or pop pop pop. I feel I’m on track with the correct 130 to 135 mains and richening the ideas to .57.
.60 Idle jet was very rich and 55 too lean
Fun to see how thy work


MORE LOGGING FUN TO COME

FIRST imported graph after a little smoothing
My RPM was off but working so I need to rewire my adapter on the 3.5 mm audio jack

Is the left margin AFR?

If so most of that graph looks dangerously lean IMO. Anything over 16 is "lean burn" In my book and above 20 should be avoided at all costs on everything.

18:1 appears to be the limit on a water-pumper set up for lean burn on gasoline.

During acceleration I want to be as lean as cylinder head temps can take it but below 13.5. Maybe richer on an air-cooled.

Only way to consistently run above 15:1 on gasoline is to have an engine designed for lean burn and a seriously active self-adjusting FI system with knock sensors.
Modern OBD2 systems work fine with lean burn but I'm not aware of a lean burn set up on an air-cooled motor.
Maybe the very last air-cooled 911s had it. They also had twin plugs and a bunch of modern technology that the T4 did not.

I would expect that would run HOT and tend to detonate. It would be very sensitive to timing adjustments.

The number on the right margin for AFR is what I believe the average for the graph and shows 17.83.

IMO, long term those AFR readings are the DEATH of new motor.

If that left margin is not AFR then the above may not apply.

I'd also check and re-calibrate the wideband as your plug does NOT look 17.8/1.
Plug looks great, maybe a tiny bit rich, IMO.
An 18:1 plug would look "glowing" white and have little white deposits on the ground strap.

Edit: Can someone tell me why the image didn't post over with the quote. I wish it had as it makes more sense if the image was with the quote.

[rfinegan]

Rich plug soot is due to idle screw out to give more air fuel to richen the lean hole at top of transition
The tan is the wot and the 13.2:1 as its leaning out a the end with the 130 mains with f11 emulsion tubes

Agreed the 55 idle jets are way too lean
I will post the graph of the new .57 idles some time tomorrow

[rfinegan]

The right margin is the key and the curser value under the mouse

[technicalninja]

The last two posts don't really make sense to me regarding the graph.

The left margin appears to be showing LM1 (sensor) from below 10 afr to above 22 afr on the vertical axis.

The purple line appears to start at 12/1 and rapidly rise to 22/1 never dropping below 17/1 until 8.25 occurs on the horizontal axis.

I'm guessing the horizontal axis is time in seconds.

Am I correct in the way this graph is set up?

I guess I'm slow as I have no idea what "The right margin is the key and the curser value under the mouse" means.

Once again, I didn't get the graph. It showed up on "preview post" just fine.
Guess I am slow...

[rfinegan]

new jets for idle .57 came in today..still too rich so back to the .55 and a data log snapshot recording

40 pdf
32 vents
55 idles
210 air
1.400 mains

29* timing at 3000

next move it to 220 air

single pull to 3600 rpm

Note the dip rich at the end is the main jets 140(rich) coming in.This was to show where the lean hole is and will continue to add air correction till the lean spike is gone...

[emerygt350]

Too rich?
Are these WOT pulls?
Are these pulls? I mean are these under load?

[rfinegan]

all data logs are while driving
Saving WOT for last but I am feeling the main pull hard at 3500 rpm

[rfinegan]

I will add a degree or 2 (+-) now that it is no longer running rich and see how the temps and performance base line again...

[rfinegan]

more fun with Logworks 3



https://www.youtube.com/watch?v=_2f9yGM7hhY


https://youtu.be/_2f9yGM7hhY

[Shivers]

Add a VDO HEAD TEMP thermocouple under the #3 spark plug. Milled a small hole for the wires and crimp.

That is pretty cool sir

[emerygt350]

Is the blue line the old and the dark line the new? I think you might be reversing the terms... It was running lean, if I am reading that correctly. Now it looks really nice, and rich enough not to blow your engine up

[VaccaRabite]

I'm still sitting here trying to figure out what is on the graphs.

On the last graph with the purple and Black lines...
Is Purple AFR and Black RPM?
Or is purple and old run and black a new run?

You need to have a line on the chart that shows RPM somewhere. It will help a LOT with tuning.

Zach

[rfinegan]

Is Purple AFR and Black RPM
0-7000 rpm Black
0-22 afr Purple
all the runs or recording sessions are in its own tab

This shows a gradual pull ”driving” from first gear and 1000 rpm to about 3500 rpm for a pull on the main jets for about 5 sec 1/2 t o 3/4 throttle pedal .

I thinks this is followed by a shift and cruse in second for a time at about 2500 rpm

Followed by a shift in 3rd at 2000 rpm cruise ( 1 min mark) and gently drive away...

( I think, I need take better notes..it may be just a single pull and a gradual cool down and no shifts just a first gear pull?

emerygt350
yeah its looking pretty good

[rfinegan]

I have been playing with a PMO fuel regulator. The gauge says 3 psi and stays steady, but the feel you get is it fine driving and the hand off from transition to main is smooth and the next time time I get into it it seconds later feels like there is not enough fuel. if I can not get this sorted, I will put the CB/Tangerine 3 psi pump back on with no fuel return

[rfinegan]

no work last night for bowling/drinking beer.. High game of 223 and 605 scratch series (WOOHOO)
Thinking, reviewing data logs and clearing my head...rain this week end, I may run a quick errand and get some more test data

[rfinegan]

The dash board and the graph are the same session

[rfinegan]

WOT pull with 12* init and 31* total time

[VaccaRabite]

WOT pull with 12* init and 31* total time

You look way lean in that WOT pull.

Tuning for Stoich is going to give you higher head temps. AFR of 11 or 12 when stomping on it will burn a little more fuel but will cool the heads and maybe net you a tad more power. It seems like you are maybe tuning for lean burn but I don't know if that's a great idea with carbs on an aircooled.
Zach

[emerygt350]

I would be super scared of those values, particularly down low too. Up high it can get wonky but I would be shooting for nothing ever touching even 13 during a WOT pull. Between 3 and 4k is when these engines are really building their power and you are running super lean at that point.

Only time I want to be at 14.7 is cruising under very light load.