As G1, G2 and E are designed to hold a car engine, has these sense in a BEC?

Any one changed this configuration to suite a bike engine ?

Those chassis members are important for the triangulation of the engine bay. Their useage to support the engine in a CEC is almost secondary (and not a very good design). Certainly they should be retained for the BEC IMO.

Normaly a BEC will have a subframe/cradle which is supported from the upper chassis rails.

I chopped mine about:

As long as you maintain triangles all is okay, mine then became the engine mounts.

Regards Mark
Rescued attachment Chassis front 2 april 2006 small.JPG

From the top, I also dragged the engine into the passenger footwell to get better weight distribution
Rescued attachment Engine cradle #3 2 Jan 2006 small.JPG

All done:
Rescued attachment OS_engine_bay_7oct2006.JPG

Thanks, I think I'll try to adapt the standard layout to the engine's subframe as shown in the pictures.

And as I can see I'll have to include the R member(s) too.

The R tubes are very important to the overall chassis, and if possible it's best to use one on either side. They can also be altered in a similar way to the bottom tubes, but try hard to maintain the triangles, as this is what gives all the extra strength.