7 port head
Turbo Mini Forums

Stu just a thought on the differing intake lengths, I belive that can-am cars used to deliberatly run diffferent intake trumpet lengths (at the same time) to get a wider torque spread.

SRE have also played with fuel injection and split ports... and again not much sucess!

Alex

AlexF

You guys should see the inlet ports of some new SAABs. Four of the eight inlet ports have a raised "floor" to give a longer intake. This is to increase the torque spread and promot swirl which is lacking on four valvers.

BMW diesels bring 1 of the inlet port pair down through the top of the head for similar reasons.

Alex

AlexF

The fluid flow calcs had allsorts in them, including reynolds numbers. Can't remember them off the top of my head. I reckon on the "eye it" approach being pretty much as accurate, if it looks right, it probably is!

Regarding the Can Am cars, I had a look at some at the Goodwood festival of speed, (What a sound?). Not sure about the trumpets, IIRC Vizard said that exponential flares (the can am ones) damp any vibrations which arise, so it's not about tuned lengths, it's about different ramming effects. I reckon it was so they could fit all those big trumpets together and it looked rude (which is no1 priority for yanks!).

I don't really reckon that the port lengths would be that significant unless you were running a totally full race cam and high CR. No real point in worrying about it. It's got to be better than a 5 port.

Bugger off, I'm getting there.

just saw this!

http://cgi.ebay.co.uk/MANX-RACING-7-PORT-H...1QQcmdZViewItem

ive just cum

I cannot really appreciate that.

It's still inferior to a decent crossflow...

if it was a cross flow id consider it for my van, but just so i didnt have to do any body mods

The Manx head was designed/made to get around regulations for a particular race series which didn't allow 8-port heads etc.

It's difficult to say how successful it was (I have no data on performance or results). But considering how few there are about you could conclude that it was either too expensive or didn't give a big enough advantage (or any).

For my engine, or a nat asp 1275 I still think it may work. especially considering the ease of fitting injection.

Wil

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

while on the topic of funny heads, i saw the price of SRE downdraughted heads the other day..... 1600 quid!!!!!
for a 5 port!!!

Thats the same as the full race AKM 7port!

WWW.TURBO-MINI.COM

there was no need for deep throat phil..............

I considered editing my post as i expected such a foul reply from you Nicholas ........

WWW.TURBO-MINI.COM

http://www.telusplanet.net/~chichm/
If you check the above-listed web site/ technical page / cylinder head flow tests, the Elder x flow Head Inlet and exhaust ports compare favourably against a variety of cylinder heads.

"Now, I realize that I am not an expert and a lot of stuff is possible with time and effort, but i refuse to belive that someone that looks and sounds like the have mental problems has got a 230 bhp mini with a princess gearbox.... "

Well, Viku has 250 hp V8 with Princess box but he looks and sounds normal, his rides may tend to be a bit mental though... Have to agree though, there is a load of high output cars over here as well, one that comes to mind had 1596 cc engine that ran up to 9000 rpms, all this breathing through a Dellorto 40. It´s a good thing there are people who can build better engines than the others.

Seriously, the space is a limiting factor, 5 port does not have that big an intake and if you split it in half the ports are bound to be small. Fabrication is an issue, trying to seal the divider properly. As for 7 porters and 8 porters, having owned one Mowog 8-porter I have to say that for a price tag that comes with them one builds a pretty slick 5 porter and usually ends up having same power. There may be a loss of tractability and torque compared to 7/8-porter but for most of us money is the issue...

The centre exhaust port on the Elder x flow head flow's 80% of the inlet Port.

Thats a quick response