my engine went though a bit a development over a few years and most work including most machining and assembling I did my self
the first engine I built for my hillclimb/circuit car was a 4g52 and that was in 1999 and the car was CAMS log booked that year - the 2 lt made 84 Kw atw
I'll try to list it as its last and most up to date configuration
astron 1 4G54 block up 0.060" flat top piston zero decked with the pistons releaved on the inlet side for valve clearance
std rods polished and shot peaned and balanced fitted with ARP bolts ( resized of cause )
crank reduced in weight and polished - balanced of cause
custom made crank scraper - balance shaft removed
custom made sump with trap door baffles , larger volume and modifide so the engine could be moved back in the engine bay
the engine sits 65 mm back in the engine bay
it also runs a very light custom made billet flywheel
the head is astron 2 and started its life on a magna it had 3.5 mm machined off the face to lift the comp - there has been some port work ,the guides were bulleted ( tapered where they go into the port ) the valve seats were opened up to the outer edge of the valve - the seats were 3 angle cut and the valve were back cut
double valve springs and the cam run about 300 degs on the inlet and 310 degs on exhuast
to dail the cam in I fitted a redrilled cam gear
the custom header is a 4 into 1 system using 1 3/4 tube with mandel bends and straight sections tig welded up and all pipes are with in 3 mm in lenth of each other and run into a 2.5" system
induction twin DCOE 13 webers with custom made 41 mm chokes and no air cleaners
the ignition curve was modifide for less advance in the curve and runs 30 deg total timing
this configuration got 119.5 Kw atw @ 6100 rpm with a very wide spead of power on the track it pulls out of slpw corners from around 2000 rpm with the cam coming on at 3000 to max at 6100 but I run the engine to 7200 at times to save a gear change
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the engine needs a rebuild now and the future mods will be a lighter knife edged crank with a new crank scaper
a light billet flywheel and a much lighter clutch
a M9 magna head with OS SS valves and more compression
50 mm quad TBs
maybe a larger set of headers with 1 7/8 "tube
and a larger cam grind
