Hello,

I'm french. I want to modify the elbow inlet manifold 4x4.

I have an problem. I will want to remove the tab cast in the elbow.
Can you help me ?
What do you think of this method in order to increase the gaz flower ?

Thanks for your reply,

Regards,

Serge

 

Dont think theres any need to remove it... ?

 

welcome to pf
but i cant answer your question

 

what do you mean exactly?
some pictures would help

i have seen some norwegian modified 4x4 inlets where the taper from elbow to plenum cover was enlarged by welding some plates in to make a wider triangle....

 

Excuse me for my approximative English. Tomorrow, I will take pictures to show the "concave" gill at the begining of the elbow. I just want to eliminate it.

Thanks for your feedback

 

Hi Serge

Have you fitted the Coilovers yet???????

Regards Matt

 

I know what you mean, its the blade in the seperate part of a 4x4 elbow - between the cover and the TB. I wouldn't remove it as it there to help getg even flow. Won't hurt to smooth and taper the edges tho - knife edge it.

 

Hi Matt,

Not at all .
It is cold and I work on my road car engine.

 

Yes, Its the blade which separate the part of the elbow. The blade help to have an better flow for all the Cylinders. I want to install an plate between the elbow and inlet to increase the volum of manifold and perhaps i can supress it ... The other solution consist to supress it, to optimize the elbow and to make and weld another one in the elbow.

Please, have you pictures of some modifications ?

Thanks

 

Hello,

Thanks for your contribution.

Can you show with pictures, please ?

 

If you want to increase plenum volume, you'd be better off getting a sweedish one, or getting a spacer to move the plenum cover away from the backing plate on the trumpets

 

IIRC he already got one

Here are some photos of a modified elbow (not my photos though!)

 

The above plenum was cut out with an air operated hack saw then cleaned and ported with a rotary burr in a die grinder. Then a plate was welded into gap with a tube round the centre plenum bolt and then some baffle plates welded inside to reduce the effect of the turbo forcing air straight down the inlet trumpets on cylinders 2 and 3.

The throttle elbow with cast in baffle plate was not touched. The only way to remove it would be the errode it away with a die grinder and rotary burr.

 

i figured that cosworth had the centre rib cast in there for a reason, as it would obviously increase the cost, so i just knife edged the 2 ends of it.

 

Have you pictures of the interior manifold, please ?

I understand that the one and fourth cylinders is poor in air. Perhaps to reduce the charge in Elbow and to reduce the cost, two aluminum tabs could be welded in the oblong part of the end of the duct in order to encourage the replenishment of the cylinders 1 and 4. With an dremel, the tab on the elbow will be supressed.

 

sorry, didn't take any pictures

are you sure that 1 and 4 get less airflow than 2 and 3? how do you know this?

even if they do, is that a big problem? obviously with the weber management you can't trim the individual fuel injectors to give ideal air/fuel ratio, but you could careful select a set of injectors that all balance. but i can't see the need on a road car, why not just run a little richer on those that less airflow, to make sure that those that get more are safe?