Carb issues

[Big-D]

There I am at AP Saturday 04h45.

I take Precious (WGT) out of the hanger and get ready for my morning flight, weather is perfect.

I started her up and noticed petrol dripping from the carbs (Bing). I looked closer and it appeared that it was dripping from the one little air vent pipe on the carb. I switched off, removed the air vent pipe and noticed it had a whole, which I promptly sealed (Note 1).

I started airy up again and she was not sounding right and I gave throttle and it felt like she wanted to die everytime I gave more juice.

Long story short, I replaced plugs, same problem and then could only conclude that it was a needle and seat problem in carbs. I removed carbs with every intent on having Aviation Engines fix the problem.

I spoke to a fellow pilot this morning much more technical knowledge than me and he recons the carbs were flooding and the needle might just have been stuck or some dirt might have come into the carb and that it was unneccesary to remove the carbs.

Anyhow, too late I have ordered new jets, needle jet and jet needle from Aviation engines and have a technical guy coming to fit it on Saturday - Hopefully this is not in vain and wil sort out the problem - The new jets and needles would of course be a huge waste of money if it was just a little dirt or stuck needle - Especially seeing as though the needle jet etc was replaced 100 hours ago. (This I also only found out after ordering the new parts - Have I mentioned that I fly the best maintained airy in the history of trikes?..)

Does anyone have any thoughts on this? Oom eend?

The problem at Aviators Paradise (where I fly from) is that there is nobody to really help with this sort of problem - If I was at Petit I recon Kasparson would have sorted me out in about 10 minutes.

So, if there are any good technically minded okes out there who want to hanger and fly from the most scenic airfield in Gauteng - Contact me, we need you as a flying buddy and to help us out from time to time with technical advice and to stop us from buying unnecessary parts

D

Note 1: The air vent pipe should have a whole.... I found that out this morning too after I had ordered new ones

[Arnulf]

So, if there are any good technically minded okes out there

Don't despair. You are busy acquiring the knowledge and soon will be exactly that, a good technically minded oke. In a few years you might become THE guru at Aviators paradise.

Regards,
Arnulf

[RudiGreyling]

Ditto & Ditto,

1) Yes, Airvent pipes need a hole, acutally make 2 in case the one get's full of oil and dirt

2) Check your needle and seat, I once had a piece of aliminium or steel shaving that bypassed my filters somehow, or broke loose downstream, lodge in the little needle and seat hole, causing it not to seal and flooding the carbs, pi$$ing fuel out that little pipe...

Regards
Rudi

[Dreamer]

Also noticed those holes in the pipes, and thought " aaaaa potential problem found".Luckily we have Leprachaun at Rhino who knows an engine front to back and inside out to put us straight and teach us these things.makes a world of difference and life alot easier to have guru around that is willing to help and teach.

[Morph]

First unblock the holes you blocked, they are supposed to be there.

I have had this problem before. One way to easily check it is switch on your electric fuel pump(if you have one dont tell me you don't have one ). The bowl will fill up and start overflowing though the breather tubes. The solution in my case was simple. Your float in the bowl is not closing off the float needle. What is supposed to happen is the bowl fills up and then the floats presses the float needle up against it's seat stopping the flow of fuel. It is very easy to adjust or clean

[Jambo]

I had a similar problem : see post spitting carbs.

I received new jets and float needle from Simonini free of charge and fitted the jets only at first. Motor is still new in terms of hours and thought the float needle would be still new.

Wit new compensated jets I still had the spitting problem and decided I had nothing to loose by fitting new float needle. And voila it seems the float needle was indeed the culprit.

Interesting fact might be the older float needle had a red rubber the new one was is black. Don't know if there was a bad batch.

Hope you get the problem sorted.

[Duck Rogers]

So now everyone's told you......yadayadayada..hanahanahana. The holes are supposed to be there
99.99% sure that the needle and seat jet is not shutting off, be it through grit in the jet or the float itself that may be damaged or whatever..... :D
So, do I get a flip for giving you info that you have already

[Big-D]

So, do I get a flip for giving you info that you have already

But of course :D

[Tailspin]

Duckie

Trust you for BLACKMAILING the poor dude

[DieselFan]

You know you got a nice plane when instead of flying himself a duck wants to sit in the back!

[Duck Rogers]

Trust you for BLACKMAILING the poor dude

It's called "duckmailing" :D

You know you got a nice plane when instead of flying himself a duck wants to sit in the back!

Took your CLEVER PILLS again this morning, I see