As some of you know I'm currently wasting all my hard earned....

I need to know your thoughts on ideal sizes of pipework for transfer of compressed air to the intercooler (front mount) and from the intercooler to the throttle body ?

My current thoughts are 50mm O/D aluminum pipe for compressor > intercooler.
the outlet on the turbo is roughly 46-47mm I/D and 52 O/D.
I think keeping hot gas speed up at this end and best to keep things relatively small ???

Not so sure on what to do with the intercooler > throttle body though !!
First impressions and ease of purchase tells me 76mm stainless ( they call it "dairy pipe" it's quite thin walled and I have lots of it already.) stainless for it's non transfer of heat properties and 76mm or 3" due to expanded cold air ??
Do I need to allow a "plenum" (sp?) area ?? (thus the idea of 3")
not sure what the next size down is on the dairy sized pipes ???

Cheers
Andy

 

engaged brain and rang pipe manufacturer

next size down is 63mm O/D.

so it's a chioce between 76mm and 63mm

Andy


Edit to also add : I have no idea on flow capabilities of that BRD spec Garrett V/F hybrid....
If some one could pipe up (lol no pun intended, Honest) what that is, it might help

[Edited by Fuzz - 4/16/2003 5:17:07 PM]

 

Very interested in your choice on this..

whats maximum boost say??

David

 

max of 1.5 while standard internals are still in.....

Cheers

Andy

 

76mm will be a swine to pipe down past radiator and under crossmember to intercooler.

perhaps a mix of the two ???


63mm out of the intercooler and up past rad, then increase gently to the 76mm and bend round to throttle body ???
but you then have to reduce it again to get it back down to throttle size. [img]images/smilies/mad.gif[/img]
perhaps I should have bored that throttle body out after all. lol

fancy making me one David

Andy

edit: typing errors :roll:


[Edited by Fuzz - 4/16/2003 5:27:22 PM]

 

you mean corky bell don't you

Andy

 

I did.. lol..

Andy.. wait and see how my tb goes.. and your in a better position than I am to make one.. You can use a lathe.. I just sort of guess.. and then ask dad to help...

Im going to redo it, but mount it on a faceplate this time..

David

 

yes please do let me know how you get on making the throttle plate....
Boring out the body is the easy bit

Andy

< thumbing through Corky's now >

 

Extract from Corky's,

(Page 78 if you have it )

An intake Plenum should be several times larger than one cylinders displacement !

Now it doesn't make it clear whether this "space" includes the inlet manifold or not !!
This alone ( I would have thought) makes up enough free air for one cylinders displacement needs ??



Andy

 

As i understand it it is before the intake runners. This is to provide the cyclinders with a bulk air source to draw from to ensure proper filling of the intake track during hard acceleration conditions. It is similar to a surge tank in a fuel line.

 

Can someone explain to me why the hot air from the compressor wants a smaller bore pipe ? I understand it is less dense...but if that is the case, for the same mass flow in/out of the intercooler there would need to be a greater volume. This greater volume would need to travel faster (even in the same dia pipe) and hence create more friction. Friction in a pipe means pressure loss.
In order to have the same pressure loss, hot/cold side pipes should be the same size ?? yes ? no ?

FWIW I use 63mm throughout and a 400bhp turbo will need to flow around 580cfm of air.

Andy

 

Ahh! here come the teckies at last.

I know very little, may be I'm spouting bollox, please tell me more.

P.s Thanks Andy
that buggers my plans to use the 50mm ally pipe I have in stock then
It is best then, to allow the air from the turbo to expand more than the 50mm outlet, YES ??

Andy

 

I consider a gradual expansion (cone reducer) up to 63mm would decrease the system pressure losses. Only downside is that the extra volume may increase lag slightly.

Andy

 

Dam ! distinct lack of further intrest here

OK..... due to the above . Just ordered a length of 63 mm tube.
1.5mm wall thickness.
£10 pr metre there goes another £60 then

Next question would be who to get to roll and edge on the ends of the pipe so that the samco's don't slip off ??

worst case scenario would be a bead of weld round the ends

Andy

 

pace sell the bits.. I dont have anything on mine and they havent blown off with 22psi..

mine is about 3mm wall though..

Looking at changing pipework now anyway

David

 

bttt

 

sleepy


Now I know the size of pipe I can order the Samco.


5 No. E90-63............ (BOOST PIPE ELBOWS)
2 No. SCH-63........... (BOOST PIPE COUPLERS)
1 No. E45-63.............(BOOST PIPE ELBOW)
1 No. SR-63-51......... (BOOST PIPE REDUCER)
1 No. SR-70-60......... (BOOST PIPE REDUCER
1 No. SHL-32............ (FORGE DUMP VALVE RETURN)
1 No. E90-32 ........... (FORGE DUMP VALVE RETURN)
1 No. VT6.3B-2.5W... (VACUUM TUBING, FORGE DUMP VALVE)
1 No. SHL-9.5........... (POWER STEERING FLUID, RESERVOIR TO PUMP)
1 No. SHL-13 ........... (POWER STEERING FLUID, RESERVOIR RETURN)
1 No. SFD-76............ (AIR DUCTING, TO COLD AIR BOX)

Christ on a bike!!! © scoobynet. I make that £243.63.

Andy



[Edited by Fuzz - 17/04/2003 18:13:09]

 

Fuzz,

RS do stainless mendrel bends in 2 2.5 and 3" both 45 and 90 degrees, £18 something vat each

They also do 3m lengths of tube for about £50 +vat

Might be cheaper to weld in pre-formed bends in some places, although having large sections of pipe that come out easily definitely helps on Davids and Tweenierobs cars.

Paul

 

Now he tells me..

I'm rushed for time, what with going on Holiday tonight for a week.
I think it will have to be "slung together" so I can get it mapped on the 3rd May (as booked with Bob) and do jap fest with it like that, then come home and "fettle" some of the bends properly.

Still waiting on Pat for the whole exhaust system and injectors...
Still waiting on Forge for the intercooler....

So it may still all go **** up anyway

Andy