I’m sure someone else has said it, but you also have a concern regarding volumetric efficiency. That is, how much of the cylinder you can exhaust and refill before compression. Because, it makes no difference how well you compress the charge if there is a significant percentage of exhaust or vacuum in the cylinder.…

This is good Jalopnik.

A little off topic, but I’ve always wondered why 4 valves per cylinder was considered the better way to go. I understand that it equates to better flow, but why not just go with bigger valves? Wouldn’t that result in the same flow with less points of failure?

This is some great content and one of the things that I think Jalopnik should do more often.

A number of years ago I worked in a shop rebuilding various PTOs and things. One of my buddies ran the engine dyno, and if I had free time when he was running an engine I would go in a watch. This one day it was a large turbodiesel. It started to run away, I don’t know exactly what why. We had a procedure to cut the…

I know, I know - having the turbo intake poking out of the front of the car is “cool.” Everybody wants to be “cool,” “sick,” “dope.”

You get ALL the credit for practicing incredible restraint in your reply to eolith. Mad respect.

Show me one of these pictures, please? And keep in mind, we’re not talking about the location of reverse here. You may want to look at that picture again.