Weber Dcom Emulsion Tubes - Help

[205Rallee 59]

Hope someone can help.

 

I've had my TU24 on a rolling road most of this week and still can't get rid of a slight hesitation at 3,200 -3,500RPM. The guy tuning it has tried all the emulsion tubes he has and reckons they are the problem. It has F69 emulsion tubes fitted, which are apparently a bit unique.

 

I am clueless when it comes to this technical stuff. Anyone out there with a solution. What emulsion tubes did the works rallyes use?

 

Thanks for any help.

[christopher 5 1 Cars]

Hi am still using the standard main system just with bigger idle jets. This is what my race carb tuner has advised.

 

Mine doesn't hesitate but it kinda explodes with power at about 3000rpm. Its quite severe actually if you are not used to it

 

I'm running a cam, headwork, CSC header and standard compression

Edited August 1, 2008 by christopher

[drmo 5]

Mine have F47 in them. Quite unique like u said.

 

I have a 1.6 TU block TU5JP and there is still some hesitation at around 2,5-3k rpm mark. I have a problem of not revving enough. It all ends at 7k rpm. 5th gear with 1.3 rallye gearbox stops at 190-195km/h (121mph). I have not done any form of headwork( maybe that is the problem), just a 296 degree cam, supersprint manifold.

 

@christopher: how high does your engine rev?

[205Rallee 59]

Mine have F47 in them. Quite unique like u said.

 

I have a 1.6 TU block TU5JP and there is still some hesitation at around 2,5-3k rpm mark. I have a problem of not revving enough. It all ends at 7k rpm. 5th gear with 1.3 rallye gearbox stops at 190-195km/h (121mph). I have not done any form of headwork( maybe that is the problem), just a 296 degree cam, supersprint manifold.

 

@christopher: how high does your engine rev?

 

Thanks both for your responses.

 

Mine has a standard bottom end with billet flywheel, Longman modified head, csc manifold, works pipercross filter,kent PTO 2 or 3 cam double valve springs, vernier pulley, Omex mapped ignition. But it has had that flat spot at 3200ish since 1991 when I got the car and it's now on its second engine and that's had two rebuilds!

 

Mine is rev limited at 7,600 and gives 100bhp or 84bhp at the wheels depending on whose dyno it's on. After a week of re mapping last week it really pulls well and the hesitation is only with a part throttle.

 

It won a sprint on Saturday and beat all the cars up to 2 litre so I might just live with it as it is!

[ashley peddle 3]

i know its slightly less technical but i had the same problem and it turned out to be a spark plug had been dropped - just took a pair of plyers to pull it apart a bit and was problem solved

[205Rallee 59]

i know its slightly less technical but i had the same problem and it turned out to be a spark plug had been dropped - just took a pair of plyers to pull it apart a bit and was problem solved

 

Just put 4 new NGK BCP7EVX plugs in it, all gapped properly!