Euro R vs Jun Stg III
Slight ware on the Euro’s but to be fair they were worn when I got them about 50k kms ago.
Torque wrench won that round.
Never felt worthy of a red cover but now I’ll make the exception. Not entirely black top any more lol.
Exhaust port cleanup. Burning oil means…
Had more soot on the ports with leaking stems, about twice as much soot!
New unit:
Ran the engine in and started up fine but then on first run after reaching operating temp it started with a loud internal metal on metal slapping sound… Feared the worst… Valve lash was set to Jun specs and checked like 8 times, including a 0.01mm larger feeler gauge to confirm the lash.
Cover off, all looked ok, keepers were still there…
Block teardown maybe…
Decided to work backwards. Stethoscope indicated the noise was coming from the head junction, so likely valves slapping. Could be work guides on the previously leaking stem valves. Removed all auxiliary units and just left the timing belt and balancer belt. Started her up and the noise was gone!!!
Refitted one by one and the noise has not come back. I presume that means there was maybe some rope or something that messed with valve seat. Or who knows… Run in complete. ~500kms. Saw Vtec a few times. Tune is ok, bumped fuel pressure and removed adjustments on Safc II. Retune soon, but also keen for some intake manifold porting before that.
Jun first impression. Beefy primary/secondary. Noticeable increase over Euro Rs. Vtec not that impressive so far but its running super rich and I haven’t gone over 5600rpm.
I guess the Jun Lemon Prelude would be the best point of comparison. The Lemon Prelude had 12.3:1 compression (I am still on 10.6:1), a big tube header (45mm primary, 50.8mm secondary, 60.5mm outlet), Euro R intake manifold, likely 2.5 inch exhaust, stock valves and uprated Jun head gear. If they had 269ps / 7650rpm and 27kgm / 5500rpm, I would hope to get to 249ps and 25kgm on the current setup. Likely only revving to 8k max given the well-aged bottom end.