Dan,

Firstly well done for the progress made... Yes yes keep moving forward.

Either position has pro's & Cons..

Step 1. Looks neater & has the shorter log...

You would be surprised how much my manifold restricts my motor. It does make a difference compared to having the turbo in the usual position.

Second benifit of step 1. Is that you dont have the exhaust running under the motor.
Therefor you dont have to take the exhaust off to drop the motor or g/box...
Plus you should be able to keep the exhaust closer to the body not running it under the motor.. (height Issues.. 100mm rule..)

Step 2... seems to have many benifits also thou...

I can see that you wont have the hassle of getting past the gear shift cables.. But more importantly... the heat from the exhaust will also be kept away from your inlet plenium...

Hope these points make sense...

_________________
Baracade
Relationships! The only time you get to sleep with the enemy!
1972 US Export Moke in Bundaberg QLD

ummm...actually option 2 has the shorter log...by about 100mm as noted by dan the exhaust intake on the turbo is closer to the front of the box so less piping...in the pics the header (log) is the same for both...dan is just mocking it up so he could see which was better and give us a better idea of what he had going on

also with the exhaust going down the front...there is a fairly convenient channel in between the main sump bubble thing and the bellhousing that should be able to accommodate a fairly large exhaust pipe without protruding far at all...certainly not further than the bellhousing...and besides...thats where its meant to go

_________________
Bling me up Scotty!
"wait till it grows into a plant...then bunny rabbit THE PLANT!"

1966 Morris Mini DeLuxe FOR SALE

Well, here is a photo of the completed Log. I will still need to finish it with a final grind but it looks OK. So I hope to bolt it up this weekend inc the turbo and start on the dump pipe.

Dan

Dan,

Have you thought of rounding the driverside 'end' off so that the gases coming out of the cylinder don't 'bunch'. The logs that I have seen use a 90 degree piece on that end. It may be purely for asthetics but there is no doubt it will 'direction' the gases towards the turbo. I would say it (the 90 degree bend) forcing air towards the turbo will also cause the other gases to go in the direction of the turbo also.

Just a thought.

JC

_________________
But he's thriving and striving and hugging the turns.

nice work dan looks so purdy!

_________________
Bling me up Scotty!
"wait till it grows into a plant...then bunny rabbit THE PLANT!"

1966 Morris Mini DeLuxe FOR SALE

i was wondering if you could just have little 90 degree bend sections inside the log...so you direct each exhaust port output in the right direction...probably a silly idea though

_________________
Bling me up Scotty!
"wait till it grows into a plant...then bunny rabbit THE PLANT!"

1966 Morris Mini DeLuxe FOR SALE

Any protrusions inside the log would just disrupt the flow from the ports behind. You could use bends between the ports & the log though.
Not sure that it would make much difference for the work involved

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Too many cars, and too little time.

wouldnt disrupt it much...bends in tubing are pretty aerodynamic...
sure wouldnt disrupt it as much as just being slammed into the wall of the log
but yeah...probably wouldnt be worth all the trouble...personally i am gonna do what JC suggested with just using the standard (or an aftermarket version of the standard) header with an extension on the end going off to where his turbo (and mine will be) mounted

_________________
Bling me up Scotty!
"wait till it grows into a plant...then bunny rabbit THE PLANT!"

1966 Morris Mini DeLuxe FOR SALE

awdmoke... protusions - I was having some thoughts on the log mani. If you were to use a 90 degree bend for each port and continue the bend to nominally protrude into the log would i reckon it wouldn't be so bad.

Lets say cylinder 1 is drivers side and passngers side is 4.

So... cylinder one has a full 90 deg bend that will form the start of the log. The log progresses to cyl 2 to meet the right angle at that port. That bend at cyl 2 will obviously not be at 90, lets say it's turned 45 by the time it reaches the log. Then lets say that you allow the outside wall of the bend to protrude into the inside of the log so that the gas form cyl 2 contiues to turn towards the turbo. As the gas from cyl 1 has been forced to go past the slight intrusion into the mani it needs to accelerate (or be restriced). So.. gas will speed up as it passes cyl 2,3 & 4 right?

Am i on the right track?

_________________
But he's thriving and striving and hugging the turns.

Yes, but that all means higher backpressure.
If you are going to use bends, put them before or as it enters the log & trim it flush. Maximum flow rate = minimal back pressure

_________________
Too many cars, and too little time.

Is this always the case? I was under the impression air that is being forced (pump by the cylinder on the exhaust stroke) will accelerate if you funnel it. Have a look at Barra's intake runners. They 'funnel' to the inlet port.

_________________
But he's thriving and striving and hugging the turns.

The more restrictions placed in the inlet/exhaust makes the engine less efficient:
- more power used to "suck" charge air mix
- more power used to pump out exhaust
- lower mass of air/fuel in combustion chamber

These hold true for NA & charged engines, however there are some points to note:
- tuned intake & exhausts will maximise flow by using the pressure pulses from the engine (not something your average home fabricator can do)
- some intake turbulence is necessary (especially on carbie cars) to ensure the fuel/air is evenly mixed
- the valves & cam must be sized to suit the backpressure
(e.g. a zero backpressure straight dump pipe to atmo will give SFA low/mid torque on an unmodded street engine)

Logs are a great compromise & they tend to smooth out the pulses.

My 2c

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Too many cars, and too little time.

but surely just whacking an extension pipe on the end of the stock header would be better than a log?

_________________
Bling me up Scotty!
"wait till it grows into a plant...then bunny rabbit THE PLANT!"

1966 Morris Mini DeLuxe FOR SALE

I'd have to agree with you there.
The factory headers are probably tuned length too

_________________
Too many cars, and too little time.

The standard starlie mani is restrictive at best.

_________________
But he's thriving and striving and hugging the turns.