Making my own exh manifold - dia of pipe to use?
Turbo Mini Forums

Hey guys ill be making my own t2 manifold and im wondering what size pipe I should use, also does someone still sell the flanges that fit to the engine?

Cheers

Craig

about 1 inch bore will be fine, have a look in the forsale section Paul_S may have some flanges left

Edited by Brett on 16th Apr, 2012.

Yes i moved to the darkside

Instagram @jdm_brett

I used 32mm OD mandrel bends, with a 1.5mm wall thickness. Remember if your going to use SS back purging of the welds is necessary to prevent oxidation of the weld on the iside of the tube.
Check out Paul S's thread on the remote mani they built for there Miglia.

"So wat we gonna do tonight Brain?"
"Same thing we do evernight Pinky!"
"Try to take over the world!"

My thinking about this has changed recently. I used 28mm bore on all my manifolds, nominal 1" stainless steel stuff.

The 998Ti compact manifold for the T2 down the back works OK but has an odd torque curve. Computer simulation has shown that pulses in the short centre branch are killing VE on the centre cylinders in the 4-5k rpm range.

Hence if you are doing a Mirage type manifold then the larger 38mm OD mandrell bends would be better as the larger bore tends to kill of the pulses.

An LCB style manifold with a remote turbo using 28mm bore stuff is good for around an extra 5% bhp.

I have one set of head flanges in stainless left. I have both head and turbo inlet flanges in mild steel.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Ill take the mild steel ones please mate just need the flanges which attach an x manifold to the head paypal? Can you pm me your address and ill pay you tonight

So i need to use 38mm od pipe yeah?? Cheers any idea where to get it from?? Need it withing 3 days tbh

If something is worth doing, it's worth doing half of.

Simulated.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

I don't doubt that 5% or so is realistic.

I believe Mike made 150nana's at 10psi. I would have expected more like 135nana's from his engine spec at this boost. (actually thats 10%)

If something is worth doing, it's worth doing half of.

Yes, 5% is conservative.

It would be considerably more if used with long inlet runners.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Craigie-B,

You have multiple PMs. For a moment there I mislaid one of the flanges. I did not realise that I only had one set of mild steel left.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Got your messages and send you the money mate :)

P.s. Is this a tight enough bend?

http://www.ebay.co.uk/itm/90-degree-Stainl...=item3cbb571b93

Does anyone know where I can get a steel version with a good wall thickness as my dad can only weld steel

Stainless is steel and easier to weld, and yes you can weld it to mild if you want to.

mmmm

is that a tight enough bend though?

It doesn't have to be a particularly tight bend. The ones I used are a larger radius than that. It isn't a question that can be answered by anyone but you really. It depends on the design you have in mind.

I wanted to make a manifold that would hold a t2 and not require me to cut the bulkhead (like a mirage basically)

I have a set of mild steel head flanges if they're any good Craig?

its alright buddy Paul S sorted me out - thanks for the offer though :)

how much you after?