Hello i have a weber DGV on my 4k-U engine and i want to ask you if it's worth putting the twin AISAN carbs from sprinter! It will go better from Weber or i will not see any gain in performance... thanks a lot!!!!

personally, I'd go with the sprinter carbs for that old school period look. Also it is so cool telling the cops that "no sir, its all factory" :P

good thought!!! xaxa!!!

but what about performance? of course i pass the emmission test with weber dgv....

but what about performance? of course i pass the emmission test with weber dgv....

And why wouldn't you pass the emissions test with the twin aisans?

 

Performance wise you probably won't see much of a difference unless you have a fairly worked 4K-U. You will probably

use a bit more fuel, it will be harder to tune and to keep it tuned and will most likely be a pain in the ass to initially set up.

the two sets of factory twins I have had were set up with nothing more than a screw driver and a piece of hose. Both were on modded 5k's and the first set I had made the engine (stock cammed, big comp 5k) idle smoother.

Edited September 24, 200917 yr by coln72

i already use a weber DGV on my 4k and a friend of mine cells me a pair of Aisan twin carbs... the price is about 200 dollars..but the question remains... is it worth buying the twincarbs or spend that money on doing other things on my corolla(msd coil,brakes etc)!!! thanks again!!!

depends what you want to use the car for i guess? as said above if you want that original look get the carbs

i already use a weber DGV on my 4k and a friend of mine cells me a pair of Aisan twin carbs... the price is about 200 dollars..but the question remains... is it worth buying the twincarbs or spend that money on doing other things on my corolla(msd coil,brakes etc)!!! thanks again!!!

 

 

Both options will give you better performance than a stock single carb, but I hopnestly don't think there would be a whole lot between them. Its not like we're comparing 3kb carbs with say twin sidies (DCOE's).

 

So my vote would be to spend the $200 on something else, like and MSD 6A (not just an MSD coil) which will give you a much more noticable improvement than what 3kb carbs ever would over a single.

ok here is my 2c...

 

twin carburettors, even twin downdraughts will be better than a single carburettor, especially a weber on an adaptor plate on a standard manifold. think about it, the sprinter manifold has twice as much room for air to enter, and the air that enters does not have to split in four directions. This will give you better breathing.

 

If you do some reading up on modifying mini a series engines, they keep going on about how they go better with multiple carburettors largely due to the manifold design being vastly improved...

 

to make your engine go better you really need to change some other bits though to make more of a difference. what sort of camshaft are you running? have you increased your compression ratio? are you running electronic ignition? these all make a huge difference, and I would really reccomend tweaking your camshaft profile before getting too carried away about carburettors or exhausts...

 

Robert.

Having run both the twin aisans and downdraft webers myself, I've found a single (appropriately sized) weber to be superior.

 

Twin aisans will outperform a 32/36 DGV in the low/midrange purely because the venturis in the DGV are to big for a 4k (designed for 1800-2000cc motor). The big primary venturi of the DGV doesn't promote highspeed air flow at low revs and sacrifices throttle response, drivability, torque, and economy. Airspeed aids atomization, which gives finer fuel particles which gives a better burn.

 

A single downdraft 28/36 DCD weber (much much better sized than a 32/36DGV) on a manifold that has been blended into the carb adapter, will outperform twin aisans. Much better simplicity, reliability, tunability, throttle response, economy and power. The DCD's have changable venturis like DCOE's so can be optimised for pretty much any sized motor from 900-2000cc's.

 

I sold my twin aisans. A single DCD is by far the best induction setup for a primarily street driven K series motor.

 

Read here about some guys experiences with a DCD weber. Note that the one used on his escort is a 36/36 DCD where both throttle plates open synchronously. ie together. The 28/36 DCD has asynchronous opening. ie primary/secondary.

i moveing it

Edited September 27, 200917 yr by KE55PIG

Don't steal the thread. Make your own please, this has no real relevance to the original post.

i have increased the compression on my 4k-u. i have electronic ignition, 1.75 exhaust and the weber DGV 32-32 with manifold with Removed casting between the throats!

i have a stock cam