35 replies to this topic

[mini93]

personaly i dont know, but iv seen few cars with it. Its also not a sharp object so you would be fine there i can only assume

[satvinder]

fair play. and would it just be personal choice for manifold size and ram pipe size aswell??

[mini93]

depends how far you want to look into it, the distance between the mouth of the trumpet and the centre of the valve shifts the torque slightly because of air oscilations but i cant remember how to work out the length you require

[satvinder]

kool so ill just take a wild stab lol
ive seen some with all sizes but never realy asked about there lengths lol

[pikey7]

have fun with this lot for all that stuff.

[AndrewJ530]

I looked into this before and if you are going with carbs, there's pretty much no way you'll get it under a standard bonnet and not have filter shrouding. The only way to keep the bonnet is like dave said, injection.

The specialist components kit looks excellent for the money (it might look expensive now but price up a head from med, webcon, minisport or HRE and you'll soon see why).

There's another problem with the 7 port heads aswell (the typical shaped ones anyway from minisport, med, webcon and HRE) is the fact that the inlet ports are massive. This loses air velocity so you'll get fuel drop out at low revs. Hence why injection is so critical to get the best out of these heads.

Now the SC kit has smaller ports for each inlet valve hence less fuel drop out. I just wonder how long the head will last though if it gets overheated a couple of times, aluminium will warp easier than iron. I'm sure Specialist compoenents will have some sort of answer to this though (maybe better coolant distribtion in the head so you don't overheat in the first place).

[satvinder]

any one got any pictures of the head or it under the bonnet

[Adcuz]

I was at Slarks (mentioned earlier in this thread) a few weeks back and there was a 7 port on the rollers being tuned. A large portion of the bonnet was cut away at the front and the two ITG filters were sticking out a bit.

Edited by Adcuz, 21 August 2010 - 10:51 PM.

[satvinder]

I nada chat with a guy a while back and decided not do try the 7port but now thinking about it as it's going to take me ages to build the car anyway I've now come around to the idea. I may start my inversergation again. Would be nicety do it just can't afford anything at the moment. Any one got any pictures or any info they can pass on to me?

[liirge]

I nada chat with a guy a while back and decided not do try the 7port but now thinking about it as it's going to take me ages to build the car anyway I've now come around to the idea. I may start my inversergation again. Would be nicety do it just can't afford anything at the moment. Any one got any pictures or any info they can pass on to me?

Don't take this the wrong way, this is how you spell investigation

[bmcecosse]

No problem having it 'sticking out' a few inches as long as there are no sharp edges etc.

[liirge]

No problem having it 'sticking out' a few inches as long as there are no sharp edges etc.

That's actually a really good point, it is an MOT fail if there are sharp edges protruding.

[MJWarren]

i think its completly daft if you go through paying out for a 7 port head which arent cheap to then just put carbs on them, split webbers n like arent cheap 1st off so why not spend a touch more money on injection, its like throwing away power if you dont! you dont have to go for expensive jenvys either, make your own plenum and use a single throttle body can work much cheaper!

Split webbers on a 7 port head? the whole idea of a 7 port head is for the X flow arrangement so you can fit twin webbers on or fuel injection, Not splits.

Youd prefer to make up a plenum and have one single throttle body instead of twin webbers? Madness in my opinion, then yes youd be throwing away power.

Expensive jenvys are the way to go if your not doing webbers, but then you have the extra cost of the ECU.

45's will be too big unless your producing near 150bhp and i doubt you will unless its full race

[mini93]

theres no getting around it, injection is more supperior than an old webber... a well designed plenium will optimise the flow and a single TB will work fine as your still delivering fuel into the steam, not just at the entry point of the plenumThe plenum doesnt have to be a simple log shape, there never going to flow well and of course will drop power. single TB would hardly be throwing away power as you can still fine tune for what ever your engine required unlike a carb which just throws somewhere near the correct amount of fuel into the flow at no where near as fine atomisasion as an injection arangment can give, giving more power, As for the split/twin... terminology mix up there, refering to the twin chokes not twin arrangment

[MJWarren]

I do admit throttle bodies are a lot better and there's no denying that. But making up a plenum with a single throttle body instead of webers is not going to see you have as much power.

For instance, a vauxhall c20xe has a single throttle body on a plenum, but people take them
Off and go from 150bhp to near 200bhp. Same with zetec lumps in kitcars.

Making up a plenum and having a throttle body kills the idea of 7 port x flow head unless your going turbo in my opinion.