Dellorto turbo problem

[Bulent]

Hello,

I'm from Holland . I'm building à BMW m10 turbo. My engine is fresh build since i start it with The dellorto's i runs really bad and most on 1 cylinder. Compression of all my cylinders is 10.5 so that can't be the problem. Of i pressurize the carbs it runs better. But one carb leaks à lot of fuel from the topcover gasket. Even wen i switch The covers THE Same carb is leaking. The float needels are new and turbo. I have à fuel pressure regulator.
And 5 liters of fuel is dissapearing in 10 minutes ideling
I bought te carbs on eBay. From à Guy who is carb specialist. But hè doesnt know the answer.

I don't know wat to do. Here in Holland there is no information available about THE subject

Thanks for al help

[fredde_vit_pv]

i think the fuelpressure is to high! what kind of regulator are you using? floater level?
is the airpressure to regulator from near the turbo or carbs?
try to set fuelpressure very low

/Fredde

[Bulent]

Fuel pressure is 0.3 bar i use à turbo fuel regulator. Float needles are 200 turbo use and float level 15 mm with 8.5 Gr. Floats

Gr

[fredde_vit_pv]

i think you can run in to problems over 0.15 in some cases! large floatervalves are sensitive.
are the return fuelline large enough?

[Bulent]

I have an malpassi fuel pressure regulator with to outgoing linea . Belive this thing is fixed on 0.35 bar its not ajustable. To loser THE pressure i gues i need an new regulator? Or are there other tricks?

But the strange thing is one carb is leaking really havy Other one just à bit spray. This stays so even when i switch top covers and fuel lines.

My in and outgoing fuel lines are all 8 mm inside.

Thanks

[fredde_vit_pv]

a large pump like holly blue overflows malpassis carb-turboregulator for example and makes it
impossible to set low pressures at idle.thin returnline and many or sharp bends to!
i still think you have to high pressure!
the malpassi i have in mind have a adjustscrew in the center on the other side from return outlet


/F

[Bulent]

I have à fuel pump original BMW with 3 bar outgoing. THE fuel pressure afther te malpassi is 0.35 bar i belive. But it doesnt explaine one carb leaking i think. And after the turbo comes in THE pressure its much higher. There is à screw om top of THE regulator. Can i turn om this screw?

Greetings from Holland

[fredde_vit_pv]

if the carbs cant handle the pressure one is going to be the weekest link and when one is
draining the pressure the other can hold it even better.
you vill need a pressuregauge to see what you ar doing and jes the regulator needs to
be adjusted on that screw!. start at 0.15-0.20

this is what im refering to
http://img366.imageshack.us/img366/1374/malpassigg2.jpg" onclick="window.open(this.href);return false;

[Bulent]

My pressure regulator had 2 outgoing lines. I have à pressure gauge its 0.35 bar at idle and under boost the gauge is not stabil. My regulator is the same as you posted bit with 2 outgoing lines. I wil try to adjust THE regulator today. But THE screw doesnt look like an adjusment screw. Do i need to go clockwise to lower?

Gr.

[fredde_vit_pv]

clockwise is to rise!. the 2 outgoing lines are connected to the same chamber

/F

[Bulent]

Ok , thanks for you help. i wil try it this evening. hope it wil help. wil let you know if i succeed!

greetings

[Jens Gustavsson]

is the referens presshur line in the plenium?

vilken fena du är på svengelska fredde eller fuskar du?

[Bulent]

Sorry i dont speak swedish. Wish i could read more about the great projects here. We dont have them in Holland. I have à hose from the plenum to te pressure regulator.

Greetings

[Baxman]

I have an malpassi fuel pressure regulator with to outgoing linea . Belive this thing is fixed on 0.35 bar its not ajustable. To loser THE pressure i gues i need an new regulator? Or are there other tricks?

But the strange thing is one carb is leaking really havy Other one just à bit spray. This stays so even when i switch top covers and fuel lines.

My in and outgoing fuel lines are all 8 mm inside.

Thanks

The carbs absolutely need to have correct float hight / fuel level, and also one of these adjustable FPR, adjusted to 0,18 BAR.
http://www.misab.se/fkt2beskr.jpg
10 mm fuel line to carry fuel from the fuelregulator and back to the fuel tank is recomended because Dellortos are said to be prone to flooding if fuel pressure is higher than 0,20 BAR.

[Bulent]

Hello im back again. Did everything last days lowered the fuel pressure removed the cilinder head checked the valves etc.

If i start the car without the turbo everything is fine. If i adjust the turbo hose the carbs start to leak.

I also pressurised the small holes beside the carbs in the plenum. Is that right? I start to give it up!

Al the info is welcome