gregrob

iTrader: (8)

I'm getting ready to have a new cam cut. Should I bother with it

93Z2871805

iTrader: (5)

Why not? The "Corvette" firing order works.

hitmanws6

iTrader: (20)

Ive always heard it helps, never heard it hurts, it do it

gregrob

iTrader: (8)

I heard it puts less stress on the crankshaft by means of less deflection

Anyone got a technical explanation

93Z2871805

iTrader: (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).

93Z2871805

iTrader: (5)

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.

gregrob

iTrader: (8)

I dont know why you would have to retune...

Just swap 4/7 injectors and plug wire I would think

93Z2871805

iTrader: (5)

Ignition wires and injector wires both would need to be swapped. I just don't know what other metering events would be affected by a bank to bank swap.

jester1614

iTrader: (13)

I dont see why a tune would be necessary, as long as the new 4 and 7 spark plugs, and injectors fired when commanded. unless the bank to bank swap effected the o2 sensors

Wicked94Z

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

gregrob

iTrader: (8)

Im going to see if Bullet can do it, if not then Im not going to screw with it.

joelster

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.

GIZMO

iTrader: (8)

Bullet can do it, but I really doubt that you will see worthwhile gains.

gregrob

iTrader: (8)

If theres a chance it will be easier on the crankshaft, why not do it?

In my research the gains are questionable, but I havent' found any negatives. If there are possible negative effects though I wont bother.

?

05HD

I think the OEM firing order is marginally better at even cylinder filling from an LT1 type intake manifold.

GIZMO

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.

gregrob

iTrader: (8)

Will do.

Thanks

IAMWAYHIGH

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.

93Z2871805

iTrader: (5)

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.

05HD

I was thinking that 7 and 8 next to each other would be worse than the benefit of the 4 next to 2 swap. Never mind that 4, 2 and1 are all in a row. I think the center cylinders (3,5,4,6) are fed the best by the LT1 intake and that is where the adjacent pairings are with the stock firing order.