StephTell

Question:

I'm busy building a custom bike with a 4-pot engine.

Now ideally I want to pair up two cyllinders into a two-into-one exhaust on either side for looks, but I also don't like the 4-pot sound through open pipes so I'm wondering if it would be good to pair the cyllinders up the way you would if you'd be making a twin-scroll manifold, i.e. 1 and 4 and 2 and 3?

Would it still run right (I don't know why not to be honest) but more importantly; would it alter the sounds a lot and make it less recognisable as a 4-pot?

botters

iTrader: (2)

i may be wrong but im sure a twin scroll runs 1+3 4+2 as per firing orders ?

StephTell

That's what I ment lol

botters

iTrader: (2)

lol thought so, would be worth looking into what scoobys run as its the manifolds on them that give the notorious off beat scooby sound

the_frozen_one

iTrader: (1)

It's the unequal length of the manifolds on the 2 banks on scoobie manifolds that create the sound. They sound totally different on equal length systems

botters

iTrader: (2)

thats what im getting at mate, might be worth trying something similar on the bike if he wants something that does not sound like your average 4 banger

StephTell

Food for thought!

Unequal lenght wouldn't be such a problem to create but what sort of lenghtdifference is needed, percentagewise?

Also, it's fuelinjected engine but I have no control over each cyllinder seperatly so would it cause problems? Iguess not as a standard scooby doesn't either?

stevieturbo

Of course the subaru has full sequential fuel injection.

Really, just build it whatever way looks best. Unless you're trying to extract every ounce of power/torque for winning races....it will hardly matter.