Increasing Venturi Size

[sam k]

hey everyone

 

I'm looking at laithing both my primary and seacondary venturis.

The engine I have is a 3K-C and I belive that the standered venturis are, 21/24 mm

What would be the largest size you would recomened, the take them out to, it is only a 1200cc!

any help would be appreciated.

 

cheers Sam.

[calaissix]

hey everyone

 

I'm looking at laithing both my primary and seacondary venturis.

The engine I have is a 3K-C and I belive that the standered venturis are, 21/24 mm

What would be the largest size you would recomened, the take them out to, it is only a 1200cc!

any help would be appreciated.

 

cheers Sam.

don't bother,it will upset the flow of the carby,if you want greater flow buy a larger carb.

[philbey]

Sounds like nonsense but bigger venturis will give less performance. Venturis are designed to accelerate the airflow through the carb. The acceleration creates a pressure drop that pulls the fuel from the bowl.

 

Larger venturis = less pressure drop = less fuel pulled out of the bowl. You may be able to improve on it, but it may just as easily got pear shaped without a bit more diggin.

[sam k]

Hey guys a bit of an old topic but i recenlty replaced my seacondary venturi and i have noticed some increase in the power when its working, also gives a deeper induction noise.

[Boost+k]

and you can't machine them... there too poris, i've tryed, theres bigger ones out there my turbo carb has 24/29 (if i remember right) but you can't really go bigger than that, my secondary isnt really much of a venturi, but its only there for boost so it doesnt matter to me lol

[philbey]

Increasing venturi size can definitely improve performance, but too big can decrease performance. All about sizing it correctly.

[coln72]

If I remember correctly, Super Jamie, had a thread on this on the "oldcorollas" forum.....

[towe001]

When he had the '25

Which was a few years back