Well then my stupid idea is: Is it possible with some playing around with the camshaft and grinding out the exhaust ports, to use the exhaust ports as the inlet ports and use the inlet ports for the exhaust ports ?

I know this sounds extreme but the siamesed inlet ports would seem to me to provide a greater restriction than the exhaust ports particularly when the firing order is taken into account.
ie If the current exhaust ports were used as the inlet ports then there would be no suck, suck, wait wait pattern on the shared inlet port but rather the better suck, wait, suck, wait.
And you also have two cylinders with an inlet port all to themselves!!!

Agreed you would have to get a new cam made and it may not be possible to grind the exhaust ports and valves to be large enough but... I imagine getting a new camshaft made and some rather different head work is going to be cheaper than an 8 port head
OK so you still have some pretty serious exhaust restriction but that is the lesser of the two evils right

_________________
---
Roads need more corners
A Deluxe(CG13DE), 2 Clubbies(998 and 1275) and 2 Morris 1100Ss

Steve O'Malley (aka Brickworx) has an 8 port head (from memory) on his race car
it looks good

_________________
Nigel Morton/ Team Brickworx
never late in a 998

There was a trick in the 1950's with Ford 4 cylinder side valve motors that had siamesed inlet ports. The trick was to fit a steel plate up the middle of the port to split it into two and then make a manifold to suit. Presto four inlet ports!

Read Vizard's writings at the link in my original post.

_________________
Chris

Everything I like is either
illegal, immoral or fattening.

We did the same with Healeys. Not really successful though as the plate and the head sort of had different expansion rates. I think the same idea was used on Holden Red Motors more successfully.

_________________
Chris

Everything I like is either
illegal, immoral or fattening.

There was another trick used post ww2 with the SV Ford Prefects used for racing, same as Fuzzy suggests. They did indeed use the intakes for exhausts, and vice versa. And it worked. But, they had 4 exhaust ports. I doubt it would be as effective with 3 inlets on an A series.
Anyhow the magic 150HP barrier has been passed now by a 5 port 1300. Greg Malaure is running it.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Here's a rare beast, Weslake 8 port. Real rocking horse doo-doo.
<edit> Looks like it's running stock Cooper S forged rockers?

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Hey now that IS nice!!!

All set up for port injection, too. "Would you like petrol or NOS with that, Sir?"

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Whose is it? I bet it would be exxy

Pretty sure it was mechanical injection, I dunno whose. But you could fit anything current on there.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Well cross flow heads arent REALLY that proven.
Because Justin on here (paddy93) drives the Cooper S out at Mallala in Nb class and he's still got his A series head which puts out about 100 horses, while another person's crossflow (arden maybe?) head puts out the same power; but i dunno what other work Justin has had done to his motor.

Main benefit of an 8 port is better torque. You can get big power (over 150 at crank from an Nb motor) from a 5 port but you won't drive it on the street. With an 8 port, you could.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

How possible is it to cast your own one of these things?
Say you allready got access to a milling machine etc.
It it a impossible dream?
Anybody done anything like that before?

Personally I wouldnt mind getting my hands on one for a few hours and make some drawings of it.

Fez

_________________
1965 850 Mini Van
1972 Clubman Van
Member of SDMC

An Arden 8 port X-Flow, when set up well,,,will out do any 5 port , simple as that,,,why???,,,because the punch you get , right the way through the power curve , is just far far greater than a 5port,,,especially in the mid range,,,wicked pull factor

if you havn`t driven one then don`t say didly about em, especially anything bad about em, cause it`s "ALL GOOD",,,you really have to drive one to understand what i`m saying,,,a 5 port still keeps it`s "Hole" in the rev range, na matter what cam, what head shape, exh system, whatever,,,there`s allways a droop somewhere & funny enough,,, if the 5 port is set up for full house revs like 8-9000rpms. then a well set up Arden to suit 7000rpms will most likely sh!t all over it.

if someone`s Arden isn`t as good as another fellas 5 port, then there`s something wrong with the engine build or the driver is not driving it right.

just my 2 cents worth,,, i`ve had the pleasure of driving them on a number of occassions,,,anyone remember the Swinton bros,,,Phil`s car was an awsome thing, & yeah, Arden 8 port very fast mini indeed.

_________________
No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.