14 replies to this topic

[liirge]

Hi
I was just talking to mate, and he asked me a very good question i could'nt answer and i was wondering if someone else could.
Induction Roar, its just air going into the engine..so why:
Do weber's make such a noise and an SU doesnt??
simple enough question but one i couldnt answer!!
Anyone know why?
Alastair

[mars red mike]

Webers have two barrels per carb, SU's (single) have one. Two barrels equals twice the noise

[Pooky]

Volume of air probably makes a difference too, Weber > SU.

Radii of throat?

[liirge]

What about twin Su's with ram pipes, they dont roar they kinda whistle a bit!

[mars red mike]

I used to have twin SU's with Les Leston ram stacks and Pipercross sock filters and they were deafening inside the car at full chat. I absolutley loved it.

[liirge]

I used to have twin SU's with Les Leston ram stacks and Pipercross sock filters and they were deafening inside the car at full chat. I absolutley loved it.

Was it a proper roar?
or just an intense sucking...i.e did it sound like this:
http://www.youtube.c...8...PL&index=34

[captain kirk]

I had twin 40s on my old capri,no air filters,loads of induction roar, yum yum

[liirge]

Yer but Why mate, thats the question why Dont SU's do it!

[mars red mike]

You cant really compare them to each other, they are two completely different engine specs. If you want induction noise take the bulkhead blanking plate out.

[liirge]

Dont really want it, i just wondered why Webers make such a noise and Su's just dont.

[captain kirk]

Yer but Why mate, thats the question why Dont SU's do it!

I have know idea, maybe the size of the carbs and the amount of air they suck in? i am just guessing.

[HARBER07]

I have previously thought about this as well. I thought maybe it had something to do with the way the fuel is delivered inside the carb, as they have totally different jetting systems.

[Ethel]

Webers are multi choke carbs with more bits sticking in to the airflow to disrupt it. A wide open SU only has a needle 'n the side on throttle disc.

[Pooky]

I don't know a lot about Weber's but don't they have two venturi per barrel? Could this add to the noise?

[liirge]

Really, thats it! suppose it makes more sense.
I thought it might be something to do with the Variable Venturi the SU has,
Cheers