Go-karter put thier hand in front of engine - why?
Discussion
Go-karter in this video clip putting thier hand in front of engine at end of straights. why they do it?
http://www.youtube.com/watch?v=bGIGyZ7jPks
http://www.youtube.com/watch?v=bGIGyZ7jPks
They are covering the airbox so that it acts like a choke. That helps to cool the engine at the end of the straight (bear in mind these engines would be around 20000 rpm at the end of the straight and running as lean as possible), and helps give more power when the throttle is opened again. But it's mainly about helping to avoid seizing.
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!
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!
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.
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.
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.
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.
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.
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.
On the higher rpm engines you get max power when the engine is quite lean.
There is a danger that the engine might seize when lean, so some people will choke the engine at the end of the straight when off the throttle to give the motor a little "extra" lube while not slowing the Kart down.
That is the reason for it.
Ex77
There is a danger that the engine might seize when lean, so some people will choke the engine at the end of the straight when off the throttle to give the motor a little "extra" lube while not slowing the Kart down.
That is the reason for it.
Ex77
Exige77 said:
On the higher rpm engines you get max power when the engine is quite lean.
There is a danger that the engine might seize when lean, so some people will choke the engine at the end of the straight when off the throttle to give the motor a little "extra" lube while not slowing the Kart down.
That is the reason for it.
Ex77
Hmmm...not really. The threat of seizure comes mainly from shutting the oil supply off at max revs, not so much from a lean mixture. If it was going to seize because of an overly-lean mixture, it would more likely do it when flat out on WOT.There is a danger that the engine might seize when lean, so some people will choke the engine at the end of the straight when off the throttle to give the motor a little "extra" lube while not slowing the Kart down.
That is the reason for it.
Ex77
As another side effect to this, however, is the cooling effect that a slug of rich mixture brings which will cool the piston and make it less likely to pop a hole in the crown.
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