Turbo headers Swept in or Log type

[AntsBuza]

Would there be any disadvantage to running a log type exhaust manifold compared to the swept in type.

[Legend]

Ant,

Are you putting a turbo on for looks and bragging factor or are you chasing the best hp possible for your combo.?

Leonard.

[Maj]

Log will make less power and be more prone to heat expansion probs.
Worth the time to make the classic v shape,
You using mild steel or stainless ? for what your doing mild steel would be easier, off the shelf 1.6 mm mandrell bends non aluminiumised will oxy weld easily and if coated last a long time .

[AntsBuza]

Bragging and looks NO so I'm guessing the log is not the way to go.

Best HP for a stage 1 type set up.
Need more HP to get the et's down.

Standard swept type it is then.
I'll be using stainless 316 mandrel bends.

[Legend]

Leonard.

[Geri]

I've seen some horrendous-looking designs that worked (dunno how long they lasted) but could not possibly have been efficient. Vee-design is better than log but log is much easier to make and will be easy to get the turbo high for good oil draining. I don't actually think there's so much in it as folk seem to think but if you're looking for the best efficiency you can't really beat the shortest,straightest path. If you end-up making a log then at least make sure the turn-into the turbine has deflectors to stop the exhaust pules from No1 firing up the No4 tube and vice-versa. Certainly I could make a log-type manifold in a day, but not a vee. The last one I made took a couple of days of cutting and measuring.

When you weld it make sure you purge the tubes with argon or it will coke-up on the inside with stainless. You don't want bits of that coming off and destroying your turbine wheel.

[The Ant]

Has someone got photo's to show the difference between a log and other type of manifold?

[Geri]

http://www.dragsource.com/index.php?navs...letoview=4