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Anonymous (no login) 202.93.98.93
Re: MR-TRX bluebird @ WSID testing today
Score 5.0 (1 person)
September 2 2006, 10:54 AM
The pics pretty much give the game away but internals such as cams/rods/pistons/springs you can't see but are - a known quantity for a drag engine .
For this kind of work the pistons and rods need to be able to withstand high cylinder pressures (~30) and revs (~8500 - 9000) . Springs have to not allow valve bounce at the desired maximum revs and prevent boost pressure on the inlet side forcing the inlet valves off their seats when their supposed to be closed . High lift cams allow rapid cylinder filling/venting and lobes with enough duration to scavange the cylinders help broaden the power (torque range) .
Ignition system has to be able to fire the charge under high cylinder pressure (tightly packed air molecules make a reasonably good insulator) so need very high voltage probably capacitor discharge ie Motec or Autronic . Obviously coil per plug . If budget allowed I'd have modified the cam cover and used Mercury Marine type CDI coils directly on the plugs (direct fire) .
Multi throttle inlet manifold gives lowest restriction throttling short of slide throttles . Also allows longer period (duration) cams to be used without the reversion dramas at lower revs . GTiR Sr20 bits could possibly fit modified manifold .
Exhaust manifold would need to be fabricated from large bore steam pipe , split pulsed and fitted with propper merged collector and split pattern T4 flange . I wouldn't use bush bearing turbos . I would start with a Garrett TO4Z BB turbo + split pulse HKS turbine housing (1.01AR ratio) and if not enough the newer Garrett GT4088R . Some highly rated Honda teams in the US love that GT4088R and with the righ exhaust manifolds and really good tuning are getting great results without the turbine lag you'd expect from a 2L four in this state of tune .
These are the lines I would work along if budget was sufficient and I had the drive and ability to win . I am not flaming whatever the Bluebird owner did - I had read that article when published and don't remember the exact details .
Very often magazine articles contain little more than garbage when it comes to tech specs .
Cheers A .
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