UK Karting - Notice Board (2-Stroke Karting) : Re: Formula Blue carb settings

Notice Board (2-Stroke Karting)

Re: Formula Blue carb settings
Posted by 'John' on 01 Apr 2010 @ 19:40

| View Message Thread | Reply to this message |

JohnJoined: August 2001
Total Posts: 1
[ View User Profile ]

All carbs do automatically adjust themselves as the weather changes but this is limited in the case of a diaphragm carb as described below.

When you accelerate, fuel is sucked from under the lower membrane where the pressure decreases. When the pressure difference above and below the membrane becomes great enough, the spring holding the needle valve lifts and the fuel is refilled. Therefore as the weather changes then the pressure on the dry side of the membrane changes and results in a corresponding change to the carburetion as the needle valve determines the fuel entering the pre-chamber above the venturi.

On a general note as far as the carburettor is concerned the engine is just an air pump and it is the carburettors job, by design to react to any changes in air demand, various issues change the air demand through the carb the most common of course being revs, however of your engine is also affected by other issues and these include:

1. engine temperature
2. engine ring seal

In terms of carburetion richer settings can lower engine temperature and improve ring seal, as can using more oil in your fuel, however changes to your fuel/oil ratio can also affect pop-off pressure settings and jet settings – good luck.

Message Thread:

Formula Blue carb settings by 'Booney' (31 Mar 2010 @ 23:16)

Re: Formula Blue carb settings by 'SimonS' (01 Apr 2010 @ 16:38)

Re: Formula Blue carb settings by 'John' << You are here!

Post a Reply:

You may post a direct reply to this message which will appear in this thread.
To post a new or unrelated message use This Form. Top of Page
Notice Board Index

[ UK Karting Main Index ]


News	Karts & Karting	Notice Board	Market Place	Companies Directory	Tracks Directory	Events Calendar	Race Results	Photo Gallery	Links