Float Chamber Extension?
Turbo Mini Forums

most of the vauhalls run bosch pumps. just be careful. some of them are coded to the cars!!!!!!!

balls to the blower!!!



1330,stage3 head, gt1549, canems ecu, S/C box and drops

the cavalier, golf gti, metro turbo etc all use the same pump. I did replace my pump at one stage with a new one, after some solder got into it.
I then got a 12mm pickup from a cav sri complete with gauze and had this brazed into my tank ( I soldered the previous pipe which had no gauze lol )

I would be amazed if there is a carburetted mini out there, that cant be satisfied by one of these efi pumps. All high pressure efi pumps flow a lot of fuel.

If you think the pump is the problem....I would suggest you are restricting it somehow.


As I said about the float bowl extension....In my opinion, fitting one of those kits to a carb, and doing nothing else, will NOT make any difference whatsoever to the fuel available at the jet.
All it will mean, is that when the bowl runs done, there will be more fuel in the bottom of the carb. You would have to extend the jet to the bottom of the bowl for it to be of any use.

As for fuelling.....I didnt have a restrictor at the mouth of my carb, which will effect things a bit. But I had to drill/ream out the jet to 0.125" and use a matching needle from a 2" SU, soldered into a 0.100" top hat, and fitted into the 1.75" piston
This was then filed accordingly.....and filed lots lol
It was probably running incredibly rich though.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Edited by RogerM on 2nd Jan, 2007.

Every day is a school day ...........

How fast and how expensive ...... the same question...

If you want the standard pump to pump more fuel, link out the fuel pump ballast resistor.

I know of a Maestro Turbo running 250BHP on the single SU. It just has a modified needle to sort the fuelling requirement.

Edited by metroturbo on 27th Jan, 2007.

I know what i'm pushing out and i don't have one of these, so i can't see the point, it makes me laugh how some companys make these super duper products that just aren't needed. Where do they get the ideas from!

Edited by Miniwilliams on 27th Jan, 2007.

Best 1/4 mile 13.2 seconds @116 mph
First 5 port miniturbo to make over 200 bhp on a carb?
First 5 port miniturbo to make over 200 bhp on Injection?

http://www.mattwoodsphotography.com

I ran a simple bosch injection pump on my granada when I was blowing through a Holley with the Rover TT engine.

Id say I was making around 450bhp back then.

As I say, if a carburettored Mini can exceed the flow of a normal Bosch efi pump, I'll be bloody impressed !!!!

Though I wasnt aware the Metro ran the pump at anything less than the usual 12-14volts ???

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

i used to have the running out of fuel sensation too, i changed the needle to a bah and fitted a big bosch pump but not sure of the number it can push 45psi and i have the fuel pressure set to 6 psi at idle and its now all good.
but i also wonder if i could get more hp with a bigger valve ??

179hp on 12psi 1293cc of pure A series
14.0et @101 mph

also look into the fuel line suppliing the pump this is a none prob area.

always looking for them bigger bunches of bannanas

Have you checked your fuel pressure regulator, to see if its set right?

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www.fusionfabs.co.uk



1/4mile in 13.2sec @ 111 terminal on 15psi

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

stevieturbo - I know you previosuly mentioned that after your fuelling mods, you were able to hold the car in 4th without any probs, and that the larger needle valve you ended up with would probably be sufficient.

Was this larger needle valve the equivalent to the modified needle valve that Avonbar sell?

Cheers.

89' Metro Turbo
157 BHP , 170 lb ft @ 15psi .... So far....
Mikeanics Rolling Road
WINNER OF RETRO CARS SHOW BEST 80's MODIFIED CAR

I havent a clue what avonbar sell.

I know my needle valve was bits of a Weber needlevalve bodged together to fit into the SU
I did try drilling several SU needle valves, but could never get them to seal satisfactorily again afterwards.

The weber valve allowed a slightly larger diamater, and had a teflon coated taper, which made sealing much better

I cant honestly remember what size I ended up at though, but I think it was around 3.0 or 3.1mm.

A regular SU valve would have fallen into the hole. The weber valve had a much wider taper, as well as a wider body once inside the carb.
I also drilled the crap out of the sides of this, to allow easier access for the fuel into the bowl itself, rather than having to pass right down the sides of the valve then out.

I still dont think I was ever able to run much more than 4.5psi or so though.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

89' Metro Turbo
157 BHP , 170 lb ft @ 15psi .... So far....
Mikeanics Rolling Road
WINNER OF RETRO CARS SHOW BEST 80's MODIFIED CAR

In Grahams Bells 4-stroke book it lists weber needle valves for different no. of carbs/power outputs.
Would have a look for you, but not sure where ive put it.

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

You can drill the needle valve orifice out to 2.9mm, then lap the valve in to make a good seat.
This is what Avonbar said they did on some of the challenge cars.

WWW.TURBO-MINI.COM

89' Metro Turbo
157 BHP , 170 lb ft @ 15psi .... So far....
Mikeanics Rolling Road
WINNER OF RETRO CARS SHOW BEST 80's MODIFIED CAR

Well mines been fine for the past 2/3 years with the valve drilled.

WWW.TURBO-MINI.COM

with a bigger orifice you may need to tweek the fuel pressure reg?

fuel pressure may require adjustment. The larger the hole, the more force acting against the needle valve.

Saying to drill it to 2.9mm is harder than it sounds.

The SU needle valve has a brass taper. SO if the taper and seat arent a perfect match, it will leak.
I had no end of trouble with this. I tried valve lapping paste etc, and I think once or twice I got it right. ( went through several needle valve assemblies )

Maybe I wasnt patient enough with the lapping paste...not sure.

But its why I opted for a Weber style valve. It has a teflon ( or some ofther softish material ) tipped valve, so naturally seals better.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Which weber valve was it that you used?

Tim

89' Metro Turbo
157 BHP , 170 lb ft @ 15psi .... So far....
Mikeanics Rolling Road
WINNER OF RETRO CARS SHOW BEST 80's MODIFIED CAR

WWW.TURBO-MINI.COM

havent a notion !!! it was years ago. It could have been from a sidedraught, or a twin choke of some description.
Around that time, I would have had some Pinto stuff lying about, so most likely came from that pile of bits.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Standard Weber and Dellorto valves are just brass on brass.
Some aftermarket types are "Viton" tipped which are supposed to seal better.
Weber valve are sized 1.5, 2.0, 2.5 etc and I am pretty sure this is the diameter (mm) of the inlet orifice
I suspect they all use the same needle.
These valves dont seal taper to taper it's just a tapered needle into a hole in a flat face.
I assume you are drilling out the SU valve body and using a Weber or Dellorto needle in there. If so I may have a few spare needles kicking around, If you want one PM me with your address and I will stick one in the post (FOC).
Regards
Dave

89' Metro Turbo
157 BHP , 170 lb ft @ 15psi .... So far....
Mikeanics Rolling Road
WINNER OF RETRO CARS SHOW BEST 80's MODIFIED CAR

My pleasure, let me have a postal address and it's on it's way.
Regards
Dave