well shut my mouth!

My foot is officially in my mouth!

equal length runners would be my goal

Thanks for the feedback,
The angle that the carby faces down is the same as on the twin carb manifold (I have twin 45's) this is just one of the carbs i am playing with.
I think it is about 10 deg. angle

The length of the runners is somewhat restricted.
I have found that if you were to have the carby paralell to the head, due to clearance of the strut tower, you would have to have very sharp angles on both runners and the air would be 'still turning the corner' as it enters the individual intakes.

The way around this could be to make a steep downward slope into the intakes, however the carby would need to be at quite an angle and i dont think the bonnet would close.

Even with my twin carb set up with manifolds, the carby's belmouths are very close to the strut tower, and they go relatively straight from each bore of the carb into the intake of the head.
If you then have to add two x 90deg. bends into the runner (so as to position carb centralised and parallel) then you are adding twice the thickness of your runner to the overall protrusion of the carb.

I will try to photo what I am describing or sketch it... as how I am describing it may be unclear.
any ideas tho? has anybody seen any other single sidedraught setups to suit oval port heads?

I sort of get what you are trying to say.

One question, will you be selling these or are you simply experimenting?

I think it's all very good, particularly if you haven't got the finances for a twin setup.

Why wouldn't you locate the carby closer to the head face? you mentioned how close the ram tubes are to the strut tower, is this the reason you have introduced the long runners and the extra bends?

if you have enough height you can hang the carb back over the rocker cover if you want long runners

Have you had the car running with this set up? how did it go?

Good effort Boof. Great to see someone willing to exercise the mind AND have a go and actually make it.
Max recommended angle for DCOEs (and maybe DHLAs?) is 7 deg. so you are probably near enough. These carbs are meant to run with the throttle shaft parallel to the direction of travel. Plenty of people get away with not doing this but sometimes they stall when stopping hard. 45 deg angle may be OK?
Unequal runner lengths may give you a broader torque band but for a tradeoff in maximum torque.
My main concern would be the large relatively cool surface area of the manifold that may need a richer mixture to keep it running cleanly. Not a problem when youre into it and everthing is good and hot though. If it runs OK during warmup then maybe a lean off and connect up the choke mechanism could help?
Where is the throttle connection on the carb?

I will take some more photos, I have welded a throttle cable bracket onto the side of the rear runner.

Yes I have driven it a few times with this set up, performance and response is very good. I havent driven a standard A15 for comparison though.

ddiesel, i think because the manifold is made of steel it seems to absorb the heat from the nearby extractors and warms the runners. It is a bit rough / lumpy at idle whilst cold but once its warmed up it seems to be ok. I dont have a choke hooked up, havent seemed to need it to start although it would help in warming the motor up I guess.

I am unsure wether having the longer runners robs much horsepower, it seems to be very willing to rev, I dont know how hard you can rev these motors yet? i stopped when i got to 160km/h as i only have a 4 speed, it still feels like it has a lot to give at that speed though.

As for making these to sell, I am unsure... if it turns out to be a good thing then I dont see why I cant make up a few if people are interested, although at the moment it is just for a bit of fun and to get my ute on the road and regod.

I had previously had twin dellorto 45's on the motor, and thought that they were massively over fuelling the motor.
Turns out that the distributor I robbed from the 1200 motor (which i removed because it was running rough) had a BENT SHAFT?! the cam lobe thing was wobbling around and only opening the points for 2 cylinders and just skimming the third!

So the twin setup will probably work fine now... But Im having a bit of a crack at this single manifold for fun.

Hey fellas thought I would show yous something I knocked up to help play around with ideas for manifolds / exhausts etc to check clearances etc.
when I get a bit of time ill knock up a few of the setups I am thinking of.

what do yas reckon?