twin weber gains

[Jamienova]

how much more bhp and torque have people gained?

And whats your car?

[Adam]

Its entirely dependent on who sets them up, and what mods the engine has.
On a standard engine i wouldn't expect more than a 8-10bhp gain....

[Royston]

Std 1.3 is 70 hp
Sport with carbs 82hp
Sport with cam 92hp

Std specs frpm press release

My Sport with std SR cam fitted, polished ported head, etc did 92 hp at the flywheel. (got a graph somewhere) at Well Lane last year

Recently fitted a Piper 285 Cam and had her RR'd and got @92hp at the wheels @ 6000rpm

Back to Well Lane next month, so will be able to compare!

[just vaux trev]

standard 20seh is 130bhp twin 40's fitted on otherwise standard 147bhp

[Nick]

Depends on the setup, but the gains over the EFI wont be much, as Ad said - probably around 8ish hp.

They do provide a one-stop solution to fueling if you're thinking of tunning the engine ! But overall, more power can be had from tuning the EFI setup... but at more cost !

[krobinson]

My old 1.3 SR engine (bored to 1400cc) running:

AST17 Cam
Solid Lifters
Group A Big valve head
Twin Carbs

Made 124bhp.

Keith

[Nick]

oh and..

E16SE standard bore.
Dellorto 40's
Kent AST2
Highly worked head, std valves.

Made 141hp

[areofall]

Anyone try a single weber? When I tunned my mini no one put on even a single weber on unless going over 120bhp, the old skool tuners said they cost you power?

[krobinson]

Anyone try a single weber? When I tunned my mini no one put on even a single weber on unless going over 120bhp, the old skool tuners said they cost you power?

On small CC engines this can be true. I've a Single weber 32/34 twin choke on my other 1.4 Nova and it really flys for a standard engine.

Keith

[CP]

A useful rule of thumb is that an extensively modded & well tuned N/A engine should be able to achieve around 100hp per litre.

Twin webers are perfectly able to be used in these situations and will deliver the goods. However they are only as good as the weakest link in the engine development process.

TBH apart from bragging rights and the noise they make there is little point in adding them to a std engine. You may find some small gains but almost certainly at the expense of fuel economy, cold running efficency and emissions