68 with carb issues

[wickedinhere]

I bought a 68 suppose to be a 100 horse motor but who knows. It has a dual carb setup and has a rough idle and a off idle bogg but runs great once it gets going. It has black smoke coming out of the exhaust at idle i am thinking the idle jets are too big not sure the make or MM of the carbs but the air cleaner tops say dellorta. Pic enclosed of the idle jet looks like it say 70 or 78 not sure.

[wickedinhere]

OK i got an id on the carb. Its a dellorto DRLA 40 and from what i read the idle jets should be between 54-58 at sea level which is where i am so the idle jets are way off. I am just wondering which jet 54-58 i should start with?

[Starbucket]

The black smoke might be from the Cam overlap. A bog off idle usually means you are not getting e`nuff accelerator pump when the peddle is pressed. Look down both carb throats and start moving the linkage, you should see gas shooting down carb when you 1st move the linkage, adjust until you do to get rid of the bog. Make sure you are timing it to 30 deg +/- 1deg at 3000 rmp's.

[wickedinhere]

I just checked and i have fuel on both carbs when the linkage is moved.

[Starbucket]

[wickedinhere]

Put the timing light on it this morning 30 deg on the money.

[Starbucket]

Let it idle a few min.s and pull a plug, if it's wet and smells of gas you could have weak spark, if it's black and sooty it's too rich. I would start with the largest recommend jet as you have a cam.

[wickedinhere]

Yeah i was thinking of pulling a plug and seeing whats going on. I will do that tomorrow but gonna order some 58 idle jets.

[Starbucket]

When you have a cam sometimes they are ground a few deg.s +/- so you may need to time your motor to the point where you get pinging at WOT then back it off 2 deg.s. Been there done that. You don't say what dizzy you have, but make sure the advance isn't froze, a drop or two of oil on pad under rotor and make sure you can twist it and it springs back.

[wickedinhere]

Ok i got the idle jets changed seemed to help some. I went ahead and changed to pertronix points eliminator new coil, cap and rotor. Still off idle bog so i checked the firing order and that's correct. While i was checking that i was grabbing plug wires while the engine was running. I kept getting shocked so i pulled off plug wire number 1 and 2 at the dist and the motor didnt seem to sputter or really change the way it ran at all. Now if i just pull # 4 off the dist the engine almost dies. Could it be that the plug wires are bad and causing a weak spark at idle? I tried pulling a plug but for some reason i couldnt get it out i think my socket is to big to get in there,

[jinx758]

21mm or 13/16" deep well is your friend ... better if they have the rubber thingy up inside
( snicker snicker ).

I bit the bullet & got a 21 with a built in universal joint on top @ my local FLAPS for $14. Best $ I've spent in a long time.

Hope this helps ... jinx
_________________
" It's not valuable unless you learn something from an experience. " Henry Ford

It's not unlike the same difference

You can't push a rope


VALVES (cold)
POINTS
TIMING
CARB (fully warmed engine)

SCRAPE ALL GROUNDS

My Craigslist rescued 100 footer :
1971 Standard Bug
1776cc dual port
034 distributor
38mm EGAS Carburetor

[wickedinhere]

Yeah i went and got plugs and had to order the wires will be in today. I found a 13/16 plug socket that is magnetic should help with.

[ashman40]

[wickedinhere]

OK guys tanks for the comments.
The dist is a 009 mech advance.
I checked the carbs and they squirt fuel as soon as i touch the throttle.
I pulled plugs on 4 and 2, 4 was dry and you can tell it is running rich. 2 was kinda wet and also black. the gaps were .035 and to big from what i have read. I gaped the plugs and replaced 2and 4 so far with new wires. I will tackle 1 and 3 tomorrow i have added a pic of the plugs the are ngk. 4 is on the left 2 on the right.

[wickedinhere]

I was thinking that since the problem seems to be on 1 and 2 cylinders that its got to be a carb issue on that side. I didnt build the car so not sure what was done to the motor. It has an electric fuel pump not sure if it has a regulator i havent found one. I was thinking that maybe to much pressure to the carb? I will check the pressure. What about valve adjustment could them being to tight or loose cause this? I dont hear any valve noise, I am just snowballing.LOL I am leaning to pulling carbs and getting them rebuilt but will check fuel pressure and valves first.

[wickedinhere]

I pulled the carbs and sent them off for a rebuild since there are off i pulled the intake off so it would be easy to change number one plug. I did a compression check and had 175 on number one and 180 on number two this is suppose to be a 100 horse motor so i figured that was the reason for the high numbers. I will do a compression check on 3 and 4 when i get to that side. I am pretty sure the carbs are the issue so we shall see.

[VW_Jimbo]

[wickedinhere]

3 and 4 are 180 also this is suppose to be a built motor 100 HP and runs good in higher rpm's just has that bog down low and runs rough at idle.

[wickedinhere]

Ok i finally got a fuel pressure gauge and the fuel pressure is at 5psi and should be 3.5 psi max so gotta fuel pressure regulator coming.