Humidity/ dry air on engine performance

[phreerider]

Hey i lived at sea level and HUMID most of the time but recent cold dry air has moved in . AND WOW the performance enhancement!


i knew most engines are sensitive to moisture and elevation but wow what a difference. one day it was 90% hum. and the next day it was 45%, amazed how much more can come out this 30cc!. i bet you guys in the north/west with cold dry air have incredible power!

 

[andyken]

Just watch out, it can get too lean...might need to richen it a bit.

 

[phreerider]

actually i did, a couple passes i could hear it drying out. with the moisture gone MORE ROOM FOR FUEL! ultra super snappy on the throttle. plug is still brown. a little more smoke just a fraction.

veer a bit here..just got a CY46 from DDM for a scooter...talk about power HOLY CRAP! love the easy pull action on the start!

 

[BertR]

I run at 5200ft ..it runs good but I tell ya 8000 is a different story.

 

[phreerider]

cool guys! glad to know it wasn't my imagination. stark difference was there. summer time tuning is challenging, no wonder i could get the stock carb happy in 100% humidity

 

[Guest]

Cool dense air is a nice plus.

 

[alfred e numan]

Bout the only way to band-aid for up in the high country is to bpump up engine compression. Thinner base gasket- trouble is- it changessort timing. its worth a try though- be shure to check squish with solder and digital calipers. Changes port timing.- I cannot repair spelling mistakes worth a damm.

 

[Kaceno]

Cold air turns these into beasts! Playing around today, the stock motor with a pipe was moving around my XB with the 0.9 ratio belt pully and Baja tires great. It was great seeing the snow fly around. Wish I would have gotten it on video.

 

[phreerider]

yep, mill monsters up with dense vapors