Weber jetting om a 2,7 RS engine

[MaRu]

Hello,

I have a 2,7 engine that now has 2,7RS mahle pistons and RS cams. It has SSi´s with stock muffler. The heads are from the small 150hp engine. I am planning to use 40 ida Webers. Does anyone know what jets and emulsion tubes I should use?

many thanks, Malte

[Flat6pac]

I d call PMO, he has all the answers and parts...
Bruce

[Steve@Rennsport]

Originally Posted by MaRu

Hello,

I have a 2,7 engine that now has 2,7RS mahle pistons and RS cams. It has SSi´s with stock muffler. The heads are from the small 150hp engine. I am planning to use 40 ida Webers. Does anyone know what jets and emulsion tubes I should use?

many thanks, Malte

What size venturies do you have as that frames the jetting?

FWIW, you are severely over-cammed with those 32mm ports and giving up a lot of low & mid-range end torque. I'd be using Solex or E cams with those heads for FAR better drivability.

RS cams, aka "S" cams work much better with 35mm or 36mm ports.

[MaRu]

Thank you! Which Venturie would you recommend? At the momemnt I have 32,34 . But I think 36 would be correct. I will buy the parts I need to have it run nice. I had the P/C and the S-cams. That´s why I used them... Maybe not the best idea.

[Steve@Rennsport]

MaRu,

36mm venturies are an excellent choice on engines with S heads, however your T heads (32mm) will not come close to utilizing their airflow capacity and in fact, will again, reduce throttle response below 4000 RPM.

I'd suggest 32 or 34mm venturies along with a cam change as previously recommended unless you either install S heads or have your current ones CNC'ed to S specification (this is something we do).

Remember,...... ALL of the engine components must match and work together to get the performance you expect.

[Lapkritis]

x2 on the heads... they're a huge part of the RS recipe.

[MaRu]

Thank you very much you guys, I guess I will install E cams...

Regards Malte