Longest trumpets

[analog_me]

Hi all
I would be interested in starting a new engine upgrade project and would need to know what is the longest trumpets you can fit under the bonnet of an s3.
Can i fit 150s or unequal 150/90 without cutting the bonnet? I wouldn't be interested I anything shorter.
Thanks

[Caddyshack]

Dave Walker at Emerald does adjustable trumpets and knows his onions on this sort of thing

[DVandrews]

That will depend on the length of the throttle bodies you are attaching them to, and of course the engine you have.. neither of which you mention.

Dave

[analog_me]

I see,

Not a simple answer then...
Thanks

[dhutch]

Tape measure is your friend.

I have 15-20mm trumpets and a cut bonnet to fit the air filter. But so longish manifold and carbs.

Oh, and it's a Westfield

Daniel

[DVandrews]

I am assuming the car is a /k series superlight, with Jenvey DTH bodies and Autoteknix airbox kit the longest trumpets would be around 100mm, the TBs themselves are around 110mm long.

Dave

[analog_me]

Hi David

It is a1.6 k series roadsport converted to superlight spec.
I haven't yet made my mind on what i would like to do with the engine. In any case it should be fully compliant to emissions standards which is a nightmare in France, so i guess will have to maintain a very mediocre cam overlap...
??

[DVandrews]

It is perfectly possible to meet emissions requirements with quite a lot of cam overlap if you have a programmable ECU (which you will need if you have TBs).

Dave

[analog_me]

DVandrews said:

It is perfectly possible to meet emissions requirements with quite a lot of cam overlap if you have a programmable ECU (which you will need if you have TBs).

Dave

Good to know 😊
Let me take a decision and sort out my financials for the project then we will talk details.
Thanks Dave

Edited by analog_me on Wednesday 27th December 10:31