Page 2 of 2
Posted: Thu Dec 02, 2004 6:02 am
by evolutionmovement
Too bad we couldn't rework DOHC heads to run rotary valves actuated by stepper motors. Just have to figure out a way to run the water pump. If I had the money ... That and a diesel.
Steve
Posted: Sat Dec 04, 2004 12:34 pm
by -K-
I don't remember morgie with a head bolt problem like that. IIRC he had EJ205 head bolts that were too long. I've seen a bunch of EJ head gaskets next to each other and they all looked like the same pattern. I've read up on several EJ22T block swaps into RS's, both DOHC and SOHC and they all said it's easy, bolt up. Some of the coolant passages are a bit different but I think you could cut out the head gasket for enough flow. Your stock head gasket covers more than half of the coolant passage.
I am going to stick with SOHC just to piss off the DOHC is better people.
Posted: Fri Dec 10, 2004 6:30 pm
by boostjunkie
vrg3 wrote:You can flow as much as you want until the air starts to reach the speed of sound. You just get more and more pressure drop as the restriction becomes more and more significant. When we talk about heads, this restriction manifests itself as a loss in volumetric efficiency.
I'm curious as to why this happens. An educated (LOL!) guess of mine would be that at the speed of sound there is a sound-pressure wave produced that tends to disrupt the flow of air. But what do I know?
Posted: Fri Dec 10, 2004 7:46 pm
by dzx
I think it may have to do with the same reason World War 2 fighters approaching the speed of sound would lose control.