Which type of induction system?

[CobraSix]

My only real concern about a new head is this:

What about the other parts? I'd try to incorporate some standards parts as much as possible. Not necessarily Ford parts, but things like Valves, stems, etc, should be easily acquired from a general parts vender if need be. I don't mind an exotic head, but exotic head with exotic parts = main PITA if you ever need a rebuild.

Slade

 

[Kstang]

Iagree with cobra six! Custom parts for a rebuild will be a major pita. I also agree with long runners to increase torque to compensate for turbo lag. Make it MPFI for sure. I know i was planning on making my own intake using the schools foundery and machine shop. but if it is made my a pro i would think twice about doing it my self. In the future i was planning on the megasquirt for tuneablity. If you do do efi let it be completly tuneable like the mega squirt so you don't have to some xcalaiber or sct or other tunners to get it done. You can do it your self with a dyno and a laptop! I personaly won't go turbo untill i have EFI it just makes it soo much easier then carb. I know some of you have done it and can do it but you have been doing it for ever. I like computers and that new fangled stuff!

 

[Anonymous]

I personaly won't go turbo untill i have EFI it just makes it soo much easier then carb.

It isn't so hard. Just learn from others.

 

[Kstang]

not really "hardness" just reliblity

 

[CobraSix]

See, while I love EFI on new cars, I like the simplicity of carbs. Simple is generally reliable or can be rigged to operate in a pinch. I like the idea of MPFI but unsure about aftermarket EFI systems.

Slade

 

[Unfalconbelievable]

MPFI with belt driven SOHC to help with the cost. If your going for extreme highend then OHC is definately better to give room for the ports to be larger. I'm definately intetrested in this project as long as it will fit aussie crossflows.

 

[Anonymous]

I'm definately intetrested in this project as long as it will fit aussie crossflows.

Ho well does a stock crossflow head flow?

 

[Unfalconbelievable]

couldnt realy tell you at the moment how much a crossflow flows. Hopefuly will be able to in the near future tho. Utes going to pannel shop as soon as I weld in the floor. Then fork out for the RRS struts and shock tower removal for extra room to mount the turbo then the engine goes for full prep, probly let you know in 3 months or so

 

[addo]

"aussie7mains" would have a pretty good recollection of flow numbers.

 

[boston774]

Chevy LS1/2/6s routinly crank out 500+ hp highly streetable horsepower with pushrods and two valves.

Not a fair comparison. There are way too many basic desgn differences to be placing them in the same boat, just because they both have pushrods.

(A 1940 John Deere has pushrods, sooo.....)

Sorry, I should have worded this better - take a DOHC, 4-valve BMW 5.0, as in the 750. You get 360hp, right on 72 hp/liter. Compare that to a Chevy LS2 with 400 from 6.0L, which is ~67 hp/liter. these motors have pretty similar powerbands, so you aren't getting a lot of power for a huge increase in cost and complexity. I agree with you completely, it's not fair to compare to a non-crossflow inline six.

That's why I am not as big a fan of OHC/DOHC, especially at street-level rpms. Properly set up geometry with light, stiff pushrods and roller rcokers, plus roller cam lifters takes away a lot of the advantage.

Crank the rpms up past 6000, now that's different. That's why most bikes are OHC.

My .02, and again, that is an opinion ONLY!!!!