4 7 cam lobe swap
#5
It's more dynamically stable, basically the OEMs (Ford) figured out by switching the firing order and better matching the companion cylinders the engine would last longer (and make a little more power).
#6
Ideas include, it cuts down on reversion, it makes power due to how the crank flexes dynamically (and if you had a billet crank it wouldn't work at all), and it makes the motor run smoother. There's no real 100% concrete evidence in how it works. It just seems to work in most cases for the better. You will need tuning for your computer to accept it though.
Trending Topics
#10
10 Second Club
iTrader: (26)
you wouldn't have to swap injectors, you can customize injector firing depending on the efi you're running. stock computer obviously out, optispark obviously out unless you wanted to run some funky *** ignition wires all over the place lol. i don't know how many step nose cams you can get on a 4/7 core though
#12
It pays dividends on larger cams, and is unnoticeable on cams that are smaller. You almost never see them on cams with less than 250 degrees @ .050". My friend has one in his 383 drag car. It sounds awesome. It has a higher pitch to the motor when he revs it.Not really sure why.
#16
TECH Addict
iTrader: (8)
So far, I have never hurt a stock crank in any way.
No negative effects that I know of, but I haven't seen any real gains in an LT1 Stocker. We dropped the idea after some testing a few years ago. Talk to Bullet. They may have better things to say.
In my research the gains are questionable, but I havent' found any negatives. If there are possible negative effects though I wont bother?
#18
Hot Rod did this sorta thing a few years ago and it got them 5-15 horse, unsure what your thinking you'll get but if you're swappin cams to a bigger one, this firing order swap would help even more. When I get some cash for a cam and the other stuff I'm totally doin that sorta swap.
#19
I'd think by pairing 4 and 2 to draw at the same time instead of 5 and 7 to draw at the same time (paired cylinders at the front closer to the TB instead of at the back of the manifold) theoretically it would put the air source of a factory manifold more in favor of the 4/7 arrangement. Chevy did it for a reason on the LS1, maybe that's it. Just a theory though.
#20
I'd think by pairing 4 and 2 to draw at the same time instead of 5 and 7 to draw at the same time (paired cylinders at the front closer to the TB instead of at the back of the manifold) theoretically it would put the air source of a factory manifold more in favor of the 4/7 arrangement. Chevy did it for a reason on the LS1, maybe that's it. Just a theory though.