Questions on 7 port turbo usage.
Turbo Mini Forums

Just thinking about my build long term as I know the engine is going to be a long time until completion and just weighing up my options.
At the moment the plan was to build a carbed 5port 1380 with a T3 on metro manifolds and megajolt running thereabouts 170hp (turned down for daily use) and just make that setup as efficient and bombproof as possible. But all this reading lately has got me thinking about the fuel distribution on inner and outer ports.
would I be able to use my hif44 on a plenum with a 7 port along with my metro exhaust manifold?
I'm just thinking about the price difference between a sorted 5 port and a 7 port. Also what sort of work would be needed on a 7 port for compression ratios? Are 7 ports mostly aluminum and If that's so would the compression ratio change because of that?
I read somewhere there was a 7 port head in the design of a 5 port, splitting the two inlet ports into four, that would be my Ideal situation but I'm not sure if you can get them, what material they are or what they're called.

Sorry for all the questions lads, and thanks in advance!

If you're going to go 7 port, I'd be looking at fuel injection rather than a HIF44. From the tiny amount of knowledge and reading I've done on the subject, having the 4 inlet ports makes it much easier to run and set up the FI.

http://www.turbominis.co.uk/forums/index.p...tid=469104&fr=0

If you are going to the bother of putting an extra two ports on your head then bin the carb. Injection is the only way. The SC head already has the injector bosses and fuel rail, so it's easy.

I've got 24cc chambers in my SC head, I don't think they go much bigger, so you'll need to look at the pistons to get a lower CR, but as you say the alloy head allows you to run higher CR anyway.

Yes, Manx made a 7-port head from a 5 by widening the inlet ports. But the one I have seen was only split in the manifold, not in the head, so not a benefit for port robbing.

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

Yeah I see what you mean Wil, Would i be better off binning the 1380 idea and going down to 1293 to aid with lowering the compression ratio?
Then really if I ever decide to go that far then it would be time to bin the dinosaur t3 and fit something more up to date such as a gt1752 and a decent exhaust manifold.
But looking at the package you can get from SC it pretty much sorts out the complete top end along with management which makes life a whole lot simpler (but very expensive! )

the work envolved/cost has always put me off. for my personal use a well modded 5 port setup is perfect, and is capable of giving more power than I will ever need.

I know what you mean Dan, but this is a car I plan on keeping for a very long time, so I don't mind waiting for the money to do stuff if it's something that I feel I would benefit from in the long term. I might find I put a 1275 back in to get the car on the road when everything else is done, then maybe finish building the 1380 5 port, then later on collect all the neccesary components for the 7 port and do that as a further project. That way I spread my cost around a bit and get to drive my car sooner rather than later :)

I managed to grind 26cc out of my SC 7 port head while still keeping the heart type shape chamber.

Edited by Turbo Phil on 17th Apr, 2013.

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If your going 7 port spend a little extra and get the sc one it will save you time and expense later on

the SC package with the ECU is good value IMO,

Talk to Jon and he can sort out a plenumn as they do one for supercharging them.

There's a whole package on there which includes a plenum if you look under the complete package options :)

even better!

Class C 3rd Place Avon 2011 14.18 @101mph