It Ain't Running Right!

[Reverend]

Hmmm. There is problem at cylinder 6. When i was driving, it felt constantly like its not running on all cylinders all the time. This morning i started it, felt and sound strange. Took of cyl nr 6 plug off, and it sounded exactly the same. SO nr 6 is not working. Its getting fuel as the plug is wet, tested plug and it gives spark... Valves? I have to do compression test as soon as possible.

Edited May 9, 2015 by Reverend

[Reverend]

Did compression test. All cylinders were ~150psi.. i cleaned those small filters that are in each carb banjo fitting, there was some crap there but it did not affect. Here is couple videos of testing spark, is it strong enough? It only "activates" when its not touching the car, only from short distance, is that normal? Check out the second video for that

 

https://www.dropbox.com/s/vehu2cfjt228q3q/20150510_122131.mp4?dl=0

 

https://www.dropbox.com/s/f5fcxdzafaa57cj/20150510_121426.mp4?dl=0

 

So its getting fuel (put my hand over the rampipe and fuel cam pouring out), it seems to have spark and its getting air. Pressure is good and valve clearances are set. What in the name of lawd almighty is wrong with nr6?

[Captain Obvious]

The spark in the first video looks a lot healthier than the spark in the second video. The one in the second video looks intermittent like it isn't firing rhythmically.

 

What was different between those two videos? Did you change something on the engine between the two?

[Reverend]

Well the spark is healthier because it does not touch the fuselage, thats the only difference. I bypassed the ballast resistor i had on place and now it gives spark normally, when the plug touches anywhere in the fuselage/engine. BUT it did not solve the problem!!

 

I measured that the new coil i have, has 3 ohm resistance and old one had 1.8 when it worked, maybe i need to get more powerful coil as well even it is not the problem anymore (i think..?)

 

I disassembled the rearmost carburator, everything looked okay, sprayed craploads of carb cleaner to every possible place imaginable. I wonder could the brake booster somehow affect cyl nr6??

[madkaw]

Pic of your dizzy and the "small box" you described. Sure sounds like ignition .

[Patcon]

Give us a picture of your manifold setup showing the vacuum taps

[Captain Obvious]

I know it's a step backwards in technology, but what are the chances you can go back to a good ol' simple points system?

 

Just long enough to make sure everything is working properly? And then you can start modifying again?

[gundee]

Dead head and set fuel pressure to 3.5psi. You can then focus on the carbs and not worry about fuel.

 

Correct.

Set at 3.5 max. You are flooding at anything more.

THEN start working on setting up the carbs correctly.

Did I miss the part where you gave the venturi size and jet sizes?

[Reverend]

32mm choke, 50/100 idle jets (50F9), 115 main jets (too small), F11 emuslion tube and 170 air corrector. My fuel pump should max out at 4 psi, so its not flooding at all, i get only ~2 psi to the fuel regulator. But cylinder nr 6 aint starving either as far as i know, if i put my hand over the throat, it blurbs fuel out.

 

Here is picture of the whole engine bay if that helps figuring out.

 

[Patcon]

If I am looking at this right your manifold does not have the balance tube connecting all the throats. Correct? If that is the case disconnect the booster off of the #6 intake and plug the port. See if that helps. If the booster is badly blown it may be causing the lack of draw on #6

[Reverend]

Shouldnt the bad booster also affect braking? Cause brakes work just fine.

[240260280z]

Try swapping carb #2 with carb #3