2.0+l 20v stroker build thread (GT2871)
finally pulled my finger out and started putting bits together!
thought I would run a build thread for those interested.
plan was to build a torquey but high revving engine that was bullet proof that would give around 200bhp/200+ftlbs at 4000rpm and max out somewhere above 350bhp.
will be in a A4 tqs (5 spd box, my biggest issue is the lack of torque available between 2500-4000 rpm when in 2nd gear, hate going in to first when pulling away from really slow corners!). car will be running KW v3 coilovers and B7 rs4 brakes on hybrid struts and driveshafts.
never done a full engine build before and have spent about two years collecting parts and researching. sourced most stuff from the US for both cost and product choice.
Spec as follows:
AJL code engine block bored to 83mm (will be just over 2l 83mmx92.9mm borexstroke)
92.8mm forged crank from a 2l VW (dowelled to strengthen timing sprocket)
Raceware Main studs
Eurospec main bearings
144mm Forged Scat rods
Calico Rod bearings
83mm Forged Supertech pistons
New water pump with metal impeller
New Oil pump
New IM shaft bearings
New seals/gaskets throughout
Ported and port matched big port head
supertech inconel/nitrided valves
Supertech titanium springs and seats
new valve guides
GT2871 with vband stainless turbine housing, custom integral 44mm Tial external wastegate vband mounting on turbine housing
custom tubular equal length runner 316 Stainless exhaust manifold with "Burns Stainless" merge collector
3" stainless downpipe
2.75" Milltek exhaust
90mm Ford Lightning MAF
Bosch motorsport inline high flow fuel pump
Tapp Auto software on new ECU
GT2871 with vband turbine housing
Block was prepped and painted and all bolt holes were cleaned up with an appropriate tap, you would be amazed how much crud came out of the holes!
bearing clearances have all bean checked with plastigage and micrometer measurements.
bearing surfaces were cleaned , top bearings fitted, lubed, crank fitted, studs fitted finger tight till they bottomed out, bottom shells/c bearings fitted to caps, lubed, tapped into place with wooden mallet and all torqued up.
crank is in place ready for run out check with dial guage (forgot my small crowbar so had to stop there!)
you can just see behind the dial guage one of the dowel pins fitted to the end of the crank for the timing pully to fit onto. the pulley has two holes right through it and fits into the dowels and keyway on the crank. It is a design fault that has failed numerous times on BT engined cars I am not having that come off when I have spent so long building up this list!
more pics to follow