bygge tubo på 2L blæsekølet

er der nogen der ved om man skal bruge en spec. weber karb. hvis man skal sætte turbo på sin motor, jeg vil ha den siddene før turboen.
mvh.

Til et draw through turbo system kan du vel bruge hvilken som helst carb, bare den kan levere nok. Den behøver ikke være "tæt" som i et blow through system.

En af mine venner kører Morris Mini med Draw through SU Carb og en kompressor. Virker perfekt!! Helt std SU carburator.

Læs:

Draw-Through: Generally speaking, there's 2 ways to use a carburetor with a turbo engine...draw-through or blow-through. The draw-through arrangement is where the carb is arranged first and the turbo then sucks air through the carb. This has the benefit that it doesn't require any special carb changes because the carb is just seeing more air flow through it. The main drawbacks are that the fuel-air mix must pass through the turbo. Since fuel is denser than air it will tend to separate in the turbo and puddle up. Don't expect instant off-idle throttle response. The turbo also becomes less efficient because it has to pump this heavier fuel mixture, and it is trying to do it's job after the carb has already caused a pressure drop. You basically have the carb causing a pressure drop and the turbo trying to increase the pressure. The efficiency losses translates into a hotter fuel-air mix in the engine which limits the boost you can run and your power.

Blow-Through: In a blow-through arrangement the turbo is going to blow pressurized air through the carb and then into the intake. This presents two problems: First, a carburetor does not understand pressure. Remember, a carburetor supplies fuel by creating a pressure drop across the venturi. If the carb sees a 2 PSI pressure drop across the venturi, it will supply that much fuel whether you are at 0 boost or 15 pounds of boost. This would cause the engine to run very lean at max boost, but it can be fixed with some form of fuel enrichment. The second problem you will encounter is that when you put pressurized air into the carb, it will make the fuel flow in ways that it is not suppose to flow. The pressure will try to crush the fuel float, it's going to want to blow fuel mix out the throttle shaft, or back into the fuel line. Don't be discouraged though these problems have all been overcome with varying degrees of success. The book Turbocharging by Hugh MacInnes covers a lot of the carburetor mods you can implement to have a successful blow-through turbo setup.

Carb Sealing: The entire carb must be sealed so it does not leak the pressurized air-fuel mix. I've heard that Dellorto carbs have ball bearings and mechanical seals so they may not need further sealing. On other carbs the throttle shaft rides inside a brass bushing, the leaking can be "fixed" by running a hose from the top of the carb where there is more pressure to a fitting that will pressurize the area around the shafts with "clean" air. Note: This method will leak clean air, but not leak the much more dangerous air-fuel mix. In a closed engine compartment, leaking fuel vapor is even more dangerous so please be careful. The metal plugs on the carb could blow out under the increased pressure. Use a punch and put several "dings" around the outside of the plugs to hold them in better. Others have used epoxy on the plugs.


FWM.

Du skal huske at finde en turbo med kulfiberpakninger, alternativt eftermontere et sæt.

Mvh
R

At en diesel ofte kører med en mindre turbolader end en benzin med samme størrelse, har ikke noget med motorens størrelse at gøre som sådan.
Det er fordi en dieselmotor ikke er så varm i udstødningen, som en benzinmotor.
Det er nemlig varmen der driver turboen og ikke motoren "puster" i udstødningen.
Det er også derfor at man oplever en turbomotor bliver stærk når den møder modstand. F.eks. op ad bakke. Med den næsten samme stilling på gasspjældet oplever man at den ligesom selv giver gas. Det er varmen, der kommer med den øgede brændstofmængde, der udvikler mere varme, der giver mere ladetryk, der tilsættes mere brændstof -- osv. Ja-ja, træerne vokser ikke ind i himlen, men det føles sådan.

Det er også derfor en turbomotor tit kan lide at få et stort udstødningsrør på lige efter turboen. Så får udstødningsgassen plads til at udvide sig og derved afkøles. Det giver mere trykfald over turbinen, som det hedder.