The engine for the Quattro S1 E2 replica is finally finished!
The engine has been built for a while but I never liked the intake manifold. The runner lengths on the aftermarket manifolds all seemed to be a lot shorter that my calculations of the optimum length, probably because of the constraints of the standard engine bay and everyone wants a big hp number these days instead of torque. I really wanted to make a replica of the Audi Motorsport unit but with a massive shortage of time so I had no option but to throw a custom manifold together on a Sunday afternoon…
I had previously come across a cast plenum from a six cylinder rice burner, so I machined out the base and quickly drew up a replacement base on CAD that included a raduised inlet and one less hole for the five cylinder donk. A short time later with some 12mm plate loaded into the CNC and the base was machined and ready to tig together… Simple!
It seems like all the stars were in alignment too – I am a big fan of drive-by-wire throttle bodies and it turned out that a 997 GT3 unit bolted straight on! I had some braided hoses left over from a previous project and the just happened to be the right lengths for the dry sump setup too!
I had originally intended on using a Garrett turbo but I have become a big fan of the Borg Warner EFR units lately. The external wastegate is redundant now…
It will be fantastic to hear this engine on the dyno soon – they have to be one of the best sounding engines ever! It isn’t pretty, but is it finished…