I'm not 100% sure the air flow is a representative parameter. Of course the more air the more heat gets pushed out. But you need to give the air some time to travel across the fins and exchange heat effectively. more complicated but I'd put a thermostat resistance in the barrel and then measure both the flow and the temperature on the head with different setups. Nice work. Buen trabajo hombre.
@@TheSteelweasel yeah. But also blowing slowly for one min could have better results than blowing like an hurricane for one second. But, on lambrettas it's all about experimenting. Thanks for sharing your work 👍
High power output and air cooling are at the best hit and miss do some sums and its staggering... Assuming a moderately tuned engine of say 20hp at the wheel, with thermal efficiency of 35%, that is 57 hp of wasted heat. This is 47kw. If the max cylinder head temp is 240C, then the thermal performance of the cooling must be (for amb of 25) is 47,000/215 degrees per watt. This is 22deg/watt for the overall engine. I congratulate you on centring on this aspect of the lambretta engine, its most important. Some way or regulating the temperature with a diverter flap etc, coupled with a more efficient fan would do it..
Long winded for a non comparative test. It should have been done with plug, inlet manifold and exhaust pipe in place. Also slight variation in position of the airflow meter would give wildly varying results.
Weird science. I heard sand blasted aluminium increases surface area. Nice ! . Yamaha RD heads have similar holes. They're not stupid; Yamaha took the Two stroke engine to high levels. Why not weld on fin extensions to the barell. Cut some steel "C" shapes; and weld them to the fins one by one. Beat them damn Vespas at their own game. What about water cooling jacket too. Has been done for Yamaha Land speed. "Speed of Cheese" did it. Check his site.
What about running a separate cowl round the cylinder and leaving the head to heat exchange to ambient air, maybe with scoop do direct air to the head at speed?
The head fins are facing the wrong way for a scoop ? And it's to road scooters I'm working on .... but keep thinking it's good and keep posting . Thanks
how can you make hot spots ? it increases air over the fins and a more uniformed cooling . at the moment with the present system i would say the barrel is almost getting no cooling and the right side is a massive hot spot .........you already have 4 very nice hot spot each barrel stud is prone to seizures , the hole for the stud is a void and voids do not conduct very well . thanks for the feed back 💖
Hi, could you tell me why the spark plug hole wasn’t simply taped over on the Mammoth head to make it a fairer test? Seeing as the difference was only 0.2. 👍🏻
I'm not 100% sure the air flow is a representative parameter. Of course the more air the more heat gets pushed out. But you need to give the air some time to travel across the fins and exchange heat effectively. more complicated but I'd put a thermostat resistance in the barrel and then measure both the flow and the temperature on the head with different setups. Nice work. Buen trabajo hombre.
blow slowly on hot puchero and see if it cools faster 😂😂😂
@@TheSteelweasel yeah. But also blowing slowly for one min could have better results than blowing like an hurricane for one second. But, on lambrettas it's all about experimenting. Thanks for sharing your work 👍
@@enricoceccarello3531 Depends on cake size and the amount of candles 😜
Very interesting Mr Bond 😉 informative work Steve
High power output and air cooling are at the best hit and miss do some sums and its staggering...
Assuming a moderately tuned engine of say 20hp at the wheel, with thermal efficiency of 35%, that is 57 hp of wasted heat. This is 47kw.
If the max cylinder head temp is 240C, then the thermal performance of the cooling must be (for amb of 25) is 47,000/215 degrees per watt. This is 22deg/watt for the overall engine. I congratulate you on centring on this aspect of the lambretta engine, its most important. Some way or regulating the temperature with a diverter flap etc, coupled with a more efficient fan would do it..
I'm running at 70c on my road bike but it's only around 12 bhp . More power more energy and so the story goes on .
Your turning into a Mad Scientist Steve😂😂 but seriously thats a great indeapth test mate & very interesting.
yes always been a little Strangelove
Long winded for a non comparative test. It should have been done with plug, inlet manifold and exhaust pipe in place. Also slight variation in position of the airflow meter would give wildly varying results.
Thanks hope you enjoyed it , and dont worry cos I'm only making these for my own bike 😊
Weird science. I heard sand blasted aluminium increases surface area. Nice ! . Yamaha RD heads have similar holes. They're not stupid; Yamaha took the Two stroke engine to high levels. Why not weld on fin extensions to the barell. Cut some steel "C" shapes; and weld them to the fins one by one. Beat them damn Vespas at their own game. What about water cooling jacket too. Has been done for Yamaha Land speed. "Speed of Cheese" did it. Check his site.
What about running a separate cowl round the cylinder and leaving the head to heat exchange to ambient air, maybe with scoop do direct air to the head at speed?
The head fins are facing the wrong way for a scoop ? And it's to road scooters I'm working on .... but keep thinking it's good and keep posting . Thanks
What you thinking of making the stuffers out of. Also couldn’t they cause hot spots leading to piston seizures. Just a thought. Great work tho pal
how can you make hot spots ? it increases air over the fins and a more uniformed cooling . at the moment with the present system i would say the barrel is almost getting no cooling and the right side is a massive hot spot .........you already have 4 very nice hot spot each barrel stud is prone to seizures , the hole for the stud is a void and voids do not conduct very well . thanks for the feed back 💖
Did your cowling have a spark plug hole cut into prior to testing, as I couldn't see clearly on my phone screen.
No hole on one cover should have taped it up to be fare .
Hi, could you tell me why the spark plug hole wasn’t simply taped over on the Mammoth head to make it a fairer test? Seeing as the difference was only 0.2. 👍🏻
Dont worry chris next test I'll tape over but I don't think it will get 15 % more .
@@TheSteelweasel you never know, don’t forget that the mammoth head was also cut out for the reed block but yours wasn’t.
How much are these please Steve?
not finished sorry
@@TheSteelweasel ok mate will be interested when available cheers, oh and keep up the great content
How do I contact you boss
abchoppersgib@yahoo.com