Go-karter put thier hand in front of engine - why?
Discussion
If this is such a problem, are there any solutions other than hand over intake?
e.g. some sort of valve and governor arrangement that, on detecting the combination of high rpm and closed throttle, allows extra oil/fuel mix into the intake (i.e. over and above what little the idle jet would provide) until either the engine speed drops or the throttle is reopened.
Such a thing available, or ruled out by cost/complexity/Karting regs?
e.g. some sort of valve and governor arrangement that, on detecting the combination of high rpm and closed throttle, allows extra oil/fuel mix into the intake (i.e. over and above what little the idle jet would provide) until either the engine speed drops or the throttle is reopened.
Such a thing available, or ruled out by cost/complexity/Karting regs?
Jonny_ said:
If this is such a problem, are there any solutions other than hand over intake?
e.g. some sort of valve and governor arrangement that, on detecting the combination of high rpm and closed throttle, allows extra oil/fuel mix into the intake (i.e. over and above what little the idle jet would provide) until either the engine speed drops or the throttle is reopened.
Such a thing available, or ruled out by cost/complexity/Karting regs?
The rotax engine in my RS125 had an oil pump with throttle compensation, but then it had a seperate oil tank. Most karts are premixed I would guess.e.g. some sort of valve and governor arrangement that, on detecting the combination of high rpm and closed throttle, allows extra oil/fuel mix into the intake (i.e. over and above what little the idle jet would provide) until either the engine speed drops or the throttle is reopened.
Such a thing available, or ruled out by cost/complexity/Karting regs?
Jonny_ said:
If this is such a problem, are there any solutions other than hand over intake?
e.g. some sort of valve and governor arrangement that, on detecting the combination of high rpm and closed throttle, allows extra oil/fuel mix into the intake (i.e. over and above what little the idle jet would provide) until either the engine speed drops or the throttle is reopened.
Such a thing available, or ruled out by cost/complexity/Karting regs?
Old two stroke Saabs had a freewheel so that they didn't run dry when you were off the throttle. I guess fitting one of these would cock up the instant driveline response you need in a racing kart though. e.g. some sort of valve and governor arrangement that, on detecting the combination of high rpm and closed throttle, allows extra oil/fuel mix into the intake (i.e. over and above what little the idle jet would provide) until either the engine speed drops or the throttle is reopened.
Such a thing available, or ruled out by cost/complexity/Karting regs?
Dracoro said:
Dracoro said:
Dracoro said:
HowMuchLonger said:
littleredrooster said:
MrBig said:
Been trying to decide whether to register on here or not for some years now, but thought I would bite the bullet to answer this question.
The theory I was taught when I started racing karts is thus:
Its a 2 stroke engine, so relies on the fuel for lubrication. When braking for a corner, you come off the throttle which shuts down the fuel (and therefore oil) supply, so you choke the engine to give it some oil while off the throttle. I don't know if it makes any difference to power coming out of the corner. I certainly don't recall it being any slower when I forgot to to it!
At last we have a winner!!The theory I was taught when I started racing karts is thus:
Its a 2 stroke engine, so relies on the fuel for lubrication. When braking for a corner, you come off the throttle which shuts down the fuel (and therefore oil) supply, so you choke the engine to give it some oil while off the throttle. I don't know if it makes any difference to power coming out of the corner. I certainly don't recall it being any slower when I forgot to to it!
Thank you - saved me typing it.
I got everything 100% though, no typo's - took some proof reading I can tell you!!If only there were quote buttons to save time, or even something newfangled like a "copy/paste" feature within operating systems.
MrBig said:
Been trying to decide whether to register on here or not for some years now, but thought I would bite the bullet to answer this question.
The theory I was taught when I started racing karts is thus:
Its a 2 stroke engine, so relies on the fuel for lubrication. When braking for a corner, you come off the throttle which shuts down the fuel (and therefore oil) supply, so you choke the engine to give it some oil while off the throttle. I don't know if it makes any difference to power coming out of the corner. I certainly don't recall it being any slower when I forgot to to it!
This 100% right^^^^ and welcome to PH.The theory I was taught when I started racing karts is thus:
Its a 2 stroke engine, so relies on the fuel for lubrication. When braking for a corner, you come off the throttle which shuts down the fuel (and therefore oil) supply, so you choke the engine to give it some oil while off the throttle. I don't know if it makes any difference to power coming out of the corner. I certainly don't recall it being any slower when I forgot to to it!
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