IDA accelerator dripping

Stuntmanus · Posted: Thu Apr 17, 2014 2:00 am Post subject: IDA accelerator dripping

The 48 IDA (brand new, made in Spain) has a constant dripping through the accelerator pump orifice.
The dripping only occurs when the engine at idle.

The folowing were checked and set:

-fuel pressure 0.2 bar of even less
-fuel level set to factory spec, but with less level also dripping
-no dirt can be seen, the whole assy had been blown throug at leat 3 times
-the cam and lever tight, no phisical damage can be seen
-the engine runs fine, but after a few seconds got rich in fuel
-the ball in the acc nozzle moves free
-the trottle butterflies are not excessively open, the idle speed 900 rpm

If I hold the linkage against the stop screw the dripping stops. Also it stops dripping when I lever off the roller from the accelerator cam.
Also if I keep the rev at 1200 rpm it stops dripping.

This is a new carb and I had took off approx 10 times from the engine and I really got pissed.

I just run out of ideas, may I have yours please? Rolling Eyes

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Stuntmanus

1974 VW 1303 RS 2110
1972 VW 1302

"Look man, I am not Mr. Lebowski, I am the Dude...!"

jfats808 · Posted: Thu Apr 17, 2014 2:59 am Post subject:

Take a look at the pump jet o ring. Secondly, check to see if its all the way seated.
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2276 IDA's 86C 11-1 DD !
2017 48 Trijet DRLA's W125

Stuntmanus · Posted: Thu Apr 17, 2014 4:27 am Post subject:

jfats808 · Posted: Thu Apr 17, 2014 6:48 am Post subject:

The only thing it can be is clogged pump jet. What I do to clean pump jets and you must wear safety glasses, is: use the straw that comes on cans of carb cleaner and use your fingers to hold the pump jet bottom and straw tight. Spray the cleaner and watch the spray pattern. Be careful. If its straight then you have cleared pump jets. The o rings are supposed to create a barrier and double check they seat. It should have an almost audible click when its seated down all the way. I cant think of anything else. sorry.
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2276 IDA's 86C 11-1 DD !
2017 48 Trijet DRLA's W125

VWNut_69 · Posted: Thu Apr 17, 2014 3:33 pm Post subject:

Try pushing on the accelerator cam while the engine is running, does it stop? If so my older IDA's did this and I tightened the spring and cured the problem.
You both mention o-rings, mine have copper washers with a screw through the center. Am I dating myself here? Smile

Mike

jason · Posted: Thu Apr 17, 2014 9:56 pm Post subject:

I had the same problem. Check your heads. Do a leak down and also check for vacuum leaks. It had something to do with the valves. I think it made the butterflies pulsate. Had the heads redone and it is gone.

Bruce · Posted: Fri Apr 18, 2014 11:04 pm Post subject:

Advance your timing.

Here's what's happening. Due to retarded timing, you have adjusted the throttle plates more open to get the idle you want. This causes the accelerator pump cam to be up on the ramp at idle. Due to natural fluctuations in manifold vacuum, the throttle plates flutter slightly, pumping fuel out the nozzles.
Grab hold of the throttles and hold them tight, the dripping will stop.
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Joe Bence · Posted: Sat Apr 19, 2014 12:41 am Post subject:

X2 your up on the ramp

c.ruber · Posted: Sat Apr 19, 2014 1:37 pm Post subject:

I'm having the same problem... What you are saying is to bump up the timing and back off the idle adjustment screws. sorry for butting in....
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...and progress is not intelligently planned...

c.ruber · Posted: Sun Apr 20, 2014 12:58 pm Post subject:

I took Bruce's advise and checked my timing. Exactly as he described. The 1/2 side carb is nice and dry, and the 3/4 side still drips a little. I may need to adjust the carb just a little to stop it completely. Thanks for the input Bruce T.
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...and progress is not intelligently planned...

c.ruber · Posted: Sun Apr 20, 2014 12:58 pm Post subject:

I took Bruce's advise and checked my timing. Exactly as he described. The 1/2 side carb is nice and dry, and the 3/4 side still drips a little. I may need to adjust the carb just a little to stop it completely. Thanks for the input Bruce T.
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...and progress is not intelligently planned...

Eaallred · Posted: Sun Apr 20, 2014 1:31 pm Post subject:

Linkage not adjusted correctly will cause this also.

If you can hold the throttle against the stop and it doesn't drip gas anymore, it would lead me to believe that is the issue. You are firmly against one throttle stop on one side, the other is not quite there. Engine vibration is causing the throttle to vibrate which is slightly pumping the accel pump.

Disconnect the linkage and see if the problem goes away. If it does, that's it. Just spend some time getting them equal at idle so one throttle arm doesn't try to float on the stop.
_________________
Eric Allred

You have to remember something: Everybody pities the weak; Jealousy you have to earn.

c.ruber · Posted: Sun Apr 20, 2014 7:10 pm Post subject:

Thanks for the input. I have held the throttle firmly closed and I'm still getting a little drippage. I'm kinda wondering if the throttle shaft is twisted or something... What to do next?
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...and progress is not intelligently planned...

Eaallred · Posted: Mon Apr 21, 2014 5:23 am Post subject:

If it turns out to be a carburetor issue, Blackline Racing here in SLC can solve it. Dave is stil there doing carbs. He was the man doing the carbs for Art Threan of ACE for many, many years. Same equipment, same building, same Dave.
_________________
Eric Allred

You have to remember something: Everybody pities the weak; Jealousy you have to earn.

c.ruber · Posted: Mon Apr 21, 2014 6:11 am Post subject:

Thanks for the heads up. I've been thinking of contacting them.
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...and progress is not intelligently planned...

Art Thraen · Posted: Mon Apr 21, 2014 6:14 am Post subject: Dripping IDA

Do as Bruce sugeest and as Eric suggest.. also look into these return spring kits.

Image may have been reduced in size. Click image to view fullscreen.

Get them at 801-747-3342 Blackline (old ACE Phone#)

Stuntmanus · Posted: Mon Apr 21, 2014 1:08 pm Post subject:

Eaallred · Posted: Mon Apr 21, 2014 1:53 pm Post subject:

Art Thraen · Posted: Mon Apr 21, 2014 2:17 pm Post subject:

c.ruber · Posted: Fri Apr 25, 2014 6:44 am Post subject:

I'm curious to know if a worn accelerator pump push rod bushing may be a contributor to my dripping...? Could the slop allow the rod to actuate the piston to cause the dripping on the one carb that is still dripping? Just a theory I'm thinking about since when I hold the throttle firmly closed I still get some droplets from the squirters on that one carb..... These are cranky old Italian IDAs.
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...and progress is not intelligently planned...


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