# Volumetric Effieciency. **URL:** \ **Category:** Shift518 Automotive\ **Created:** [November 8, 2009, 9:52pm UTC](https://forums.speedlife.net/t/volumetric-effieciency/248226 "2009-11-08T21:52:08Z")\ **Posts on this page:** 1\ **Showing post:** 10
**Author:** ![Boxersix](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/boxersix/32/6327_2.png) [@Boxersix](https://forums.speedlife.net/u/Boxersix)\ **Post date:** [November 11, 2009, 6:31am UTC](https://forums.speedlife.net/t/volumetric-effieciency/248226/10 "2009-11-11T06:31:57Z")
Formulas suck Vlad. I like to pretend they don’t exist and we as humans just randomly throw numbers and shit together to make all this up, yet still make cool things that work :lol 1320(John???) nailed it on the head on all accounts though, no need to go into depth any further than he did. > [@OMG Onyx Z32 is on fox 29 right now...](https://forums.speedlife.net/t/omg-onyx-z32-is-on-fox-29-right-now/25627/17): > > Overlap is essentially the best solution to this complex problem by the way. With overlap you can let the air in the cylinder without fuel, while you let the intake velocity get up to speed. This plain air sweeps the remainder of the combustion gasses out of the cylinder. Combusted gasses are hot, and take up space in the chamber. They can also lead to spontaneous combustion or knock. > > Also the overlap cools the walls of the intake chamber which allows for slightly higher compression ratios without knock as well. Some companies(like VAG) also released their data showing how the newer DI motors have a bit higher VE as well. It’s pretty cool shit looking at CFD comparisons of some dino four banger to a 2.0FSI Fluid dynamics is fun :lol Ug brain hurts just mentioning that… --- _[View the full topic](https://forums.speedlife.net/t/volumetric-effieciency/248226)._