|11-08-2012 07:01 PM|
Gearing including the result of tire size and vehicle weight as well as the end use of the machine will also impose restriction or open possibilites. Stiff gears and light weight combine to let you run more compression than what would otherwise be expected. Drag racing will let you may even require you to push the limits harder. Round track especially in the dirt will also let you push harder. Paved round track and road course will force a back off of the upper limit because of the better traction and the possibility of hauling the revs up in the wrong gear which will overload the engine and push the detonation limit sooner. A hot street engine will also have to be more conservative on compression, especially if you mix it with higher gear ratios. Off road tends to use large diameter tires, these unless you really hang some nasty gears in the rear end, will also drive a more conservative compression solution.
So to be of any real help I'd have to know a whole lot more of what's in-store for this high ouput 350.
|11-06-2012 02:10 PM|
|11-05-2012 09:01 PM|
|1Gary||Still there is a case for not going much over a 8.5 DCR.|
|11-05-2012 08:25 PM|
There may be an argument made for an inverted dome piston combined w/the chamber volume needed for the target CR, but generally speaking a FT w/a smaller chamber will give better flame propagation and a cleaner burn w/better quench/squish action than an open chamber and a dome.
The shape of the chamber is also an important part of it all. A heart or kidney shaped chamber having a larger area quench pad and a more central spark plug location biased towards the exhaust valve (like on the Fast Burn and Vortec heads seen on the right, below) will give a better quench/squish action and detonation resistance than even the earlier small chamber SBC heads (like the fuelie heads, left below) w/FT pistons.
|11-05-2012 07:21 PM|
What's best on a 355 domes and open or flatop and closed? Runnin 93 oct
On a High Horsepower 350 pump gas what is better?