Placing the turbo and manifolds - Drawings
Turbo Mini Forums

Hi,

Right, i have made som drawings about my comming 998 T engine.

But, would you see my "drawings" and plans, are they ok, or is it at bad solution for me. The turbomanifold is?nt any problem, i?m quite good working in metal and tubes. And the blue tubes are going to be in stainless steel, polished. Hubba hubba...




The Crazy Dane...

Edited by Thomas Bjoern on 10th Aug, 2005.

looks like a plan... go for it!
alex

AlexF

Maybe one allready have done it? I havnt seen anyone yet, but i think its nice, and you can see all the parts more clear then

This is a clubby front right?


I don't care for the curve sweeping into the carb - then again, you'll have a plenum here so that's irrelevany I guess...

No, Mini 1000, no clubman here.
Plenum, is the 180* box before the carb, right?

Oh yes - i´we found this on the site ? http://forums.turbominis.co.uk/_photos/mem...motors/68/1.jpg

http://img.photobucket.com/albums/v292/TurboPhil/JSPD_16.jpg

Metro turbo weekend driver,Mini turbo in the making again!

Dave, you mentioned not liking the curve on another thread I posted. Would you mind explaining that? The stock setup looks to be even worse than this curve idea, and short of plumbing everything through the cabin, I don't see what other options there are...

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1967 Cooper 's' Turbo build @ www.drjing.com

http://img.photobucket.com/albums/v292/Tur...tchmounting.jpg

Metro turbo weekend driver,Mini turbo in the making again!

So if that curve goes into the plenum it should be okay? just not straight into the carb...? did i understand that right?

http://mini.twisted-design.net/blog/

There was a guy on here who built a similar thing (turboestate, he was).

Beautiful installation, sadly all the pictures that were posted (by Minimark) have now dissapeared.

Pointless post really, but it might inspire someone to post the pics again.

Wil

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Edited by mikemph on 11th Aug, 2005.

So, Dave, in this case the plenum is just acting as a large collector for the air to jumble around in, and then the carb draws in from the plenum to get air that is closer to the same speed all around. I think I get it, now. The plenum will slow the velocity of the air on the outside because of the large box it pipes into, prior to the carb. OK, you've made a good case to keep the stock plenum. I'll go that route, myself. New thread...!

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1967 Cooper 's' Turbo build @ www.drjing.com

I may be asking a bit stupid, but why cant i use the std karburettor to the turbosystem, with a bigger mainjet. Someone here in Denmark have made a old Opel(Vauxhall) 1,2 with std carburettor, and turbo with IC.

Thomas,

You could use a standard carb, just as long as you can somehow make it sense boost pressure and increase fuelling to keep the fuel-air ratio correct.

The other problem is that std carburettors are designed to work always under a vacuum, so you might encounter problems when pressurising them.

That assumes you use the "blow-through" method of turbocharging.

The other option is to place the carb BEFORE the turbocharger, so you are then compressing the fuel and air mixture. This has various downfalls, and although it can work, is considered an inferior method. However it allows the carb to still work purely in vacuum.

If i placed the carb before the turbocharger, i would not be able to start the engine, if the fuel has to get past the turbine and intercooler, and down in the champers. Or that? Maybe it could start, but it would still give at very slow response on the gas.

Maybe its better to get at Metty carb or something else boostsuitable. Or an injection system?

Placing the carb before the turbocharger can work, people out there have done this and made it work. However like you say, response is poor.

Metro carb is the best starting point as it is already suitable for the blow-through setup. In fact the entire Metro fuelling setup of manifolds/plenum/carb/fuel system is quite hard to beat.
Injection is very difficult to make work well on the 5 port head with its 2 siamesed inlet ports. The Metro SU with some work can be made to perform within maybe 99% of "optimal". Injecting a 5 port head will really struggle to do any better.
All the fastest UK cars still use the SU.

Right.
Is it easy to get a used metro carb, from England? Maybe shipped to denmark, with plenum ect? And to a reasonable price?

Pistons, can i take 2-3mm of them(dont know the measuments in inch, i think 1/10") to get at lower compr. or can i modify the cylinderhead? Or some new pistons?

Edited by Thomas Bjoern on 13th Aug, 2005.

Yes, second hand carbs are available, or if you want you can still buy a brand new one.

Try the UK eBay site, www.ebay.co.uk.

Removing material from the top of the pistons is not a good idea, you loose the "squish" band, and in doing that promote detonation. Not what you want.
A far superior method is to enlarge the cylinder head chambers.
Or if you can afford it, new pistons like you say with a bigger dish.

hi im back with some pics
[img http://i18.photobucket.com/albums/b122/tur...stegatePipe.jpg[/img][img]
[img
http://i18.photobucket.com/albums/b122/tur...teInstalled.jpg[/img][img]
[img
http://i18.photobucket.com/albums/b122/tur...heenginebay.jpg[/img][img]
[img
http://i18.photobucket.com/albums/b122/tur...14-1446_IMG.jpg[/img]

Edited by turboestate on 14th Aug, 2005.

love that straight cut scream!!!
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