Intro from Montana: '73 2.0L rustoration thread Options

[930cabman]

(IMG:style_emoticons/default/shades.gif)

Thanks for the pointer, this guy has been my hero for many years

[Superhawk996]

(For anyone who missed it, getting called a dick is a badge of honor in this thread: http://www.914world.com/bbs2/index.php?s=&...t&p=2801518 ) (IMG:style_emoticons/default/smile.gif)

Dang, I've gotta try harder. (IMG:style_emoticons/default/laugh.gif)

Maybe you need a small herd of Ferrets since you're so opposed to cats (IMG:style_emoticons/default/unsure.gif)

[bbrock]

Quite some time ago on another thread, someone commented they thought I could pull off a DIY PPF install. I took that as a dare, and I can't pass up a dare. So this just happened (IMG:style_emoticons/default/blink.gif)



Going to do a full front install. I could have bought die cut pieces for ~$500 extra. It's a pretty simple pattern I think I can do with a 5 cent razor blade and save significant coin. I should have quite a bit extra material to avoid F-ups. Should be interesting...

[FlacaProductions]

If anyone can figure it out...AND document it....it's you. Looking forward to seeing your results!

[bbrock]

Had to make a 200 round trip for a work dinner last Wednesday so I took the 914 and took a few glamour shots. Locals will be able to pick out The Sphinx in a couple shots. Car ran fantastic except for a high idle that I fixed today. Had to make the same driver yesterday but it was snowing on the way over, so had to take the boring car.

[Dion]

Looking fantastic Brent. Those side markers are really well done. Quiet part of town?
Luv the scenery. I need to get back out there.
Enjoy! (IMG:style_emoticons/default/beerchug.gif)

[Superhawk996]

(IMG:style_emoticons/default/wub.gif) very cool pictures

[bbrock]

Anniversary

Tomorrow is the one-year anniversary of my post-resto maiden voyage.

(IMG:http://www.914world.com/bbs2/uploads/post-20845-1622315957.jpg)

Since it looks like I'm going to be stuck with these carbs for another driving season, I decided to finally hook up the wideband to check the AFR. I've been paranoid I might be running way too rich or lean. I have data now but not sure what I need to do next to dial in the carbs, so any help appreciated.



I spent a lot of time trying to get a reading from the lambda. Turns out I must have wiped out the free-air calibration the first time around. After I pulled the sensor and re-calibrated again, it worked fine.

Initial readings with warm engine at idle were around 11.0 - too rich. I redialed the idle mixture on all barrels but this time aiming for the leanest mix that produced a steady idle rather than backing out until the idle came up and then another half turn for good measure. After several rounds, it was idling very smooth at around 700 rpm @ AFR of 12.3 which seems okay. I would be happier with 13, but will take it.



It's raining here and the gravel road is ridiculous sloppy, but I took the car out to get more readings anyway. In general I think it is running a bit rich and really rich in some areas. Here are my notes:

Idle - ~12.3

Low speed just off idle - ~11.0 Too rich. Do I need to reduce the size of idle jets?

WOT - ~12.5 It dips to low 11s when the throttle opens then climbs as it leans out a bit. Not sure if backing off the accelerator pump would be a good idea

70 mph cruise - Mostly ~12.8 - 13.5 The road I was on is mountainous so not much straight cruising to get steady readings.

Deceleration/downhill - mostly in low 13s but can go as lean as 14.9

Overall I think these numbers look decent for what I've seen recommended for air cooled engines except that low speed (20-30 mph) cruising at 3000 rpm or so. I'd love to tune for a bit more economy but since I'll be swapping the carbs for FI, it's not worth going crazy over, but again, the low speed range looks too fat to me. I also get a bit of surging driving at those speeds which I suspect is related to the rich AFR.

Any suggestions on how to improve are welcome (IMG:style_emoticons/default/beerchug.gif)

Also, the Expel PPF is here but I need to buy some supplies before attempting the install. (IMG:style_emoticons/default/bye1.gif)

[tygaboy]

@bbrock - I can't speak to carbs or air cooled (so why am I even posting...? (IMG:style_emoticons/default/huh.gif) )
Maybe it holds true across engines: With my Holley ECU there's a specific setting that completely cuts fuel on closed throttle. I display AFR as one of the gauges in the digital dash and on closed throttle, it pegs full lean.
Again, maybe it's a different game with an H2O cooled, but I thought I'd mention it.

[bbrock]

@bbrock - I can't speak to carbs or air cooled (so why am I even posting...? (IMG:style_emoticons/default/huh.gif) )
Maybe it holds true across engines: With my Holley ECU there's a specific setting that completely cuts fuel on closed throttle. I display AFR as on of the gauges in the digital dash and on closed throttle, it pegs full lean.
Again, maybe it's a different game with an H2O cooled, but I thought I'd mention it.

Nope, not a different game. One of the may reasons I want to go FI is to be able to do exactly that, shut off the fuel completely when it isn't needed. I believe on carbs, you just have to take what you get when the throttle closes and whatever you get is a waste of fuel. I'd also like to know a little more about how lean is safe for an air cooled engine at highway cruise with little load.

[bkrantz]

You could move closer to sea level. (IMG:style_emoticons/default/biggrin.gif)

Seriously, I am sure you have thought about jetting appropriate for your home elevation.

[bbrock]

You could move closer to sea level. (IMG:style_emoticons/default/biggrin.gif)

(IMG:style_emoticons/default/lol-2.gif) A reason I want to Megasquirt is so I can drive from here to Seattle without burning a hole in a piston. I guess moving to Seattle could fix that (IMG:style_emoticons/default/biggrin.gif)

Seriously, I am sure you have thought about jetting appropriate for your home elevation.

Yep, I started another thread to figure out how best to do exactly that. Then the question is how far to go given I hope to be ditching the carbs over next winter (yeah, that's what I said last here (IMG:style_emoticons/default/smile.gif) ). Right now my leaning is to swap to smaller idle jets, and maybe increase the air correction jets. The first to lean out the idle and progression circuits, the latter to lean the upper end a bit.

This from someone who doesn't really understand all of this stuff. Objectives here are to increase fuel economy at low speeds and be able to motor over some 10,000 ft. passes this summer without having the engine choke on fuel.

[raynekat]

After you get the snakes in house to handle the mices....just let me know if you need the "flocking kit" back. (IMG:style_emoticons/default/wink.gif) (IMG:style_emoticons/default/tongue.gif) Oh man....

[bbrock]

After you get the snakes in house to handle the mices....just let me know if you need the "flocking kit" back. (IMG:style_emoticons/default/wink.gif) (IMG:style_emoticons/default/tongue.gif) Oh man....

(IMG:style_emoticons/default/av-943.gif) Luckily, the mouse didn't flock up the flocking. I actually wound up buying my own materials so can flock myself now (IMG:style_emoticons/default/rolleyes.gif)

I think we're overdue for some critter shots.

One of a flock that has been showing up in the yard for some months now.


From the "frog room" in our house last week.




And the obligatory knucklehead shot.

[76-914]

@bbrock - I can't speak to carbs or air cooled (so why am I even posting...? (IMG:style_emoticons/default/huh.gif) )
Maybe it holds true across engines: With my Holley ECU there's a specific setting that completely cuts fuel on closed throttle. I display AFR as on of the gauges in the digital dash and on closed throttle, it pegs full lean.
Again, maybe it's a different game with an H2O cooled, but I thought I'd mention it.

Nope, not a different game. One of the may reasons I want to go FI is to be able to do exactly that, shut off the fuel completely when it isn't needed. I believe on carbs, you just have to take what you get when the throttle closes and whatever you get is a waste of fuel. I'd also like to know a little more about how lean is safe for an air cooled engine at highway cruise with little load.

Using Jakes guide I'm sure you could use your head temp sensor to extrapolate the A/F ratio required. (IMG:style_emoticons/default/confused24.gif)
http://www.914world.com/specs/JakeRabyHeadTemps.php

[rfinegan]

this will get you close for a set of webers and a wide band O2
https://www.aircooled.net/how-to-use-a-wide...-flat-4-engine/

[bbrock]

this will get you close for a set of webers and a wide band O2
https://www.aircooled.net/how-to-use-a-wide...-flat-4-engine/

Just responded on the other thread, but I will thank you here as well! (IMG:style_emoticons/default/beer.gif)

[bbrock]

Using Jakes guide I'm sure you could use your head temp sensor to extrapolate the A/F ratio required. (IMG:style_emoticons/default/confused24.gif)
http://www.914world.com/specs/JakeRabyHeadTemps.php

I haven't installed a head temp sensor yet (just oil temp). When I do, it will be part of the Megasquirt project so this crazy carburetor stuff will be moot by then. (IMG:style_emoticons/default/smile.gif)

[bbrock]

Hi all,

I know a couple folks have wondered what the heck happened to me so I thought I'd drop a quick note here. I'm still kicking and have been lurking off and on but haven't participated much due to being thrown one of life's curve balls. In early January I was diagnosed with metastatic melanoma which has pretty much consumed all of my time since. I began immunotherapy treatment which is not only very effective against melanoma but usually much gentler on the body than traditional chemo. I wasn't so lucky and have had serious side effects which have landed me in and out of the ER and hospital several times. I'm told I came within a coin toss of buying the farm once. There is obviously a much longer story, but last week I had surgery at the Huntsman Cancer Center in Utah to remove the tumor and have been recovering here since. I am headed home tomorrow and hope to be driving the 914 within a couple of weeks albeit without the megasquirt I had hoped to install over the winter. (IMG:style_emoticons/default/driving.gif)

[krazykonrad]

All the best for a speedy recovery! We're all pulling for you.