Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Balance shaft delete (better MPG observed)

Ecky · 05-20-2019, 02:27 PM

I'm almost done putting a Honda 2.4L in my Insight. One of my first mods to the engine was to delete the balance shafts. These weight around 11lbs, are part of the oil pump assembly, and spin at twice engine RPM because their purpose is to minimize second order harmonics which would be transferred through the engine mounts. They don't do anything for engine longevity and add both friction and a lot of inertia to the engine.

I'll post a video of it when I'm done, looking like Thursday.

05-20-2019, 02:27 PM	#9 (permalink)
Ecky Master EcoModder Join Date: Dec 2011 Location: New Zealand Posts: 5,016 ND Miata - '15 Mazda MX-5 Special Package 90 day: 40.51 mpg (US) Thanks: 2,870 Thanked 2,515 Times in 1,555 Posts	I'm almost done putting a Honda 2.4L in my Insight. One of my first mods to the engine was to delete the balance shafts. These weight around 11lbs, are part of the oil pump assembly, and spin at twice engine RPM because their purpose is to minimize second order harmonics which would be transferred through the engine mounts. They don't do anything for engine longevity and add both friction and a lot of inertia to the engine. I'll post a video of it when I'm done, looking like Thursday. __________________ Ecomodding 2015 MX-5 Miata Honda Insight w/Acura TSX engine 2000 Insight TLC & Build Thread