Power jets... EGT's... and scooter racing...

[J1MS]

I watched the racing at mallory, and as usual took more notice of the scooters than the racers, but for a change I spoke to one or two of the racers.....while I was talking I overheard two of the racers talking about the EGT and the Solenoid triggered power jet on their Dellorto carbs, the Idea I take it wass to switch on the power jet when they saw a high temperature indicated by the EGT......that way preventing the engine overheating and not over richening the engine prior to this point, allowing maximum power to be gained by being able to run leaner than they probably would without the switchable power jet....which I thought was pretty cleaver....

But the question I asked myself was.... if the EGT is operating a gauge that gives a readout in degrees, this would obviously be controled by a varying resistance, which is directly dependant on the EGT sensor's temperature, then why manually switch it... I thought it might be easier and more self reliant to use the varying resistance itself as the swithing system to trigger the power jet. This way you wouldnt need to watch the gauge whilst trying to ride flat out.... Im quite sure its possible that you could miss the vital moment by thirty seconds or more maybe even a lap or two before you realise your close to melt down....or has this thought process already been looked at, and Ive missed the boat again...

[soulsurfer]

I seem to remember hearing or reading somewhere about Charlie Edmonds somehow using water to cool an engine/exhaust operated my a manual switch

[J1MS]

I seem to remember hearing or reading somewhere about Charlie Edmonds somehow using water to cool an engine/exhaust operated my a manual switch

Saw that liked the Idea and there is alot more theory behind the Idea of the water injection than simply cooling the cylinder.....
Charlie Edmonds runs an electronic Power jets and uses an EGT.... but both appear to run independantly, the power jet is I think manually switched via a solenoid....maybe hes had the Idea of activating the solenoid from the EGT's resistance and thought better of it.... ..But I think it might allow more attention to be focused on the race rather than the EGT gauge...just maybe wire an LED in paralell to indicate that the Power jet has triggered....

[Avantone]

I watched the racing at mallory, and as usual took more notice of the scooters than the racers, but for a change I spoke to one or two of the racers.....while I was talking I overheard two of the racers talking about the EGT and the Solenoid triggered power jet on their Dellorto carbs, the Idea I take it wass to switch on the power jet when they saw a high temperature indicated by the EGT......that way preventing the engine overheating and not over richening the engine prior to this point, allowing maximum power to be gained by being able to run leaner than they probably would without the switchable power jet....which I thought was pretty cleaver....

But the question I asked myself was.... if the EGT is operating a gauge that gives a readout in degrees, this would obviously be controled by a varying resistance, which is directly dependant on the EGT sensor's temperature, then why manually switch it... I thought it might be easier and more self reliant to use the varying resistance itself as the swithing system to trigger the power jet. This way you wouldnt need to watch the gauge whilst trying to ride flat out.... Im quite sure its possible that you could miss the vital moment by thirty seconds or more maybe even a lap or two before you realise your close to melt down....or has this thought process already been looked at, and Ive missed the boat again...

I'm guessing that his intuition is better at working out when he needs to operate it and for how long in relation to track position, than a simple switch is capable of given the very limited practice time available on the day.