'90 Brumby Weber tuning help

[Gumby]

Hi All,

New here to the Forum and seeking some help in tuning a weber 32/36 dgav for my '90 model subaru brumby and it has the EA81 engine, I've just put the carby on, I'm assuming it came off a escort or cortina have several all being the same exept for the size of the main jets and air bleed jets. Anyway its seems better at certain throttle positions and idles ok but now the car seems to desiel on when turning it off it has a flat spot between idle and 1/4-1/2 throttle. the carby has 127 primary main jet

130 secondary main jet.

175 primary air correction jet.

135 secondary air correction jet.

venturi thingy 4.5 primary

venturi thingy 3.5 secondary

ide jet primary 55

ide jet secondary 50

the carby also has the anti stall attached not sure if it is suppose to be removed or not. its a diafram located opposite the acelerator pump.

 

Any help would be great anyone out there that may have already done the carby swap, jets sizes emulsion tube sizes. Any information on how the polution gear is set up properly with this carby.

should I still use the anti backfire valve and the reed valve.

 

Sorry this got so long

Any help is appriciated

Thanks

Gumby

[GeneralDisorder]

140 primary

140 secondary

170 primary air corrector

160 secondary air corrector

 

Both venturi's should be 3.5

 

Your idle jets are fine.

 

I've never seen any difference in the emulsion tubes - I'm sure they make different ones, but all the weber's I've messed with were 50?? I think.

 

Remove that anit-stall thing - don't need it.

 

Remove your anti-afterburn valve, and your air injection reed valves - not needed unless you need them for air quality.

 

Getting the deiseling to stop is all about timing, and idle mixture/speed. If you have the idle speed too high, or the timing off, this will happen. Easy way to stop it is to get the anti-deisel solenoid that Weber makes for the main idle jet. But you really don't need it if you tune it right.

 

Acceleration flat spot is either the jets (probably) or could also be a bad accelerator pump.

 

GD

[Gumby]

Thanks heaps mate I'll try setting it up the same and see how it runs,on more question do you run the standard 6 deg timing?

Thanks HEAPS!!!

[GeneralDisorder]

I generally run the stock 8 degrees myself, or maybe a little less as my heads are milled a bit on one engine.

 

GD

[Gumby]

Thanks to everyone that helped me with this, I have finally got the weber running quite well I have ordered a few more jets but I end up with this with what I had around:-

 

Primary main-132

Secondary main-140

Primary air correction-170

Scondary air correction-165

Primary Idle-55

Secondary Idle-50

 

NOTE:- This carby has no choke or choke plates they were removed a while ago (for a gain of about 3cfm)

 

Seems to run very well even when cold, its a prick to start but once running, it will Idle slowly after a few minutes of reving at 1500rpm.

I set the timing at standard 6deg (1990 Brumby ute).

anti back fire valve and reed valve are disconnected.

The carby changes the sound completely, The enginge revs quicker and smoother, Still a few flatspots though mainly at quater throttle and i thnk it could use a larger secondary main for the top end isnt much different to the old carby. When jets arrive will play and post results.