AydinZ71 Posted April 8, 2021 Share Posted April 8, 2021 Hi all! Restoring a rusted 240z series 1, SCCA vintage race car. Car last raced in 02'. Currently rebuilding to group EP spec's. I figured id start a new thread summarize my plans and progress. Il just add progress photo's to this thread. Thanks for reading! Engine: L24 Block – OEM bore, stroke. OEM materials. Not modified Head – N42 core Modifications: polished bowls. Valve seat de-shrouded. Minor reliefs cut around seats, but within ID spec of gasket. Chambers polished and de-burred. Deck machined to reduce chamber volume to 38.5cc's. Piston-deck clearance is -0.35mm, so with a fel-pro gasket (1-1.25mm), it should net a static CR of 10:1 Intake ports matched and polished within 1” of mounting surface. Same on intake manifold. Valves – OEM intake. Exhaust and seat are custom turned down to 33mm (L24 spec) Valve springs: Custom single bee-hive, with custom machined narrow steel retainer Cam: Exhaust and Intake are symmetric. 320 duration, 234 @ 0.05. 0.500 lift. 109 overlap Carbs: Stock SU's. Will purchase SM needles Exhaust: MSA 6-1 header w/ O2 weld bung, Eastwood header paint, and fiber wrapped. Anticipate using Borla XS straight-through muffler. Will consider adding resonator if I have room. Materials acquired for full 2.75” 304SS exhaust Ignition: Distributor with electronic pick-ups. This came with the car, so not familiar with it. Looking into crank triggered ignitions system for better resolution and tuning. Standard coil, NGK spark plugs and wires. Racing dampener/pulley Stock flywheel. Remote oil filter w/ copper/AL oil cooler mounted in front of radiator 3-row radiator No radiator fan at this time Notes: since class rules allow 12:1, intent is to install domed pistons during the next block rebuild. 10:1 with existing flat-top pistons should currently work for 91 octane. Will use wide-band O2 to log A/F with SM needles to gather data points for needle modification. Transmission – series 2 240z OEM Nissan 4-speed Clutch/Flywheel: Have not pulled transmission since purchase, but presume OEM. OEM driveshaft Differential: 17' Subaru STI helical LSD, 3.545 Half-shafts: Datsun restomod custom CV shafts with integral diff input shafts for STI R180 Have a spare 4.11 R180 but have not ponied up the money to transfer the helical center section. Fuel 12 gallon poly/aluminum fuel cell with steel support bracket. Came with two fuel output ports and one vent. I recently installed a level sending unit so I no longer need to use a dip stick. Dual (redundant) low pressure fuel pumps with outboard check valves, leading to single Y header. 3/8” galv/steel fuel hard-line being installed in tunnel. -6 AN fittings and new nylon/SS braided lines throughout for connection from hard-line to fuel cell and carbs. Generic FPR set to 5psi, feeding SU floats. Currently dead-heading but im looking into the need to install a return line. Brakes Proportioning valve installed in tunnel, protruding into center console for access while driving. OEM rear drums OEM front calipers. Cross-drilled rotors Suspension OEM hubs Struts sectioned with Ground Control coilovers. Eibach springs 350lb/in front, 300 rear Koni 8610 RACE adjustable shocks Ground Control custom bolt-in camber plates Urethane bushings throughout Rear has Apex Engineering control arms (got a good deal on offer-up) Rear sway bar Front is OEM at this time Wheels – Diamond steel racing wheels, 16lbs, 15X7” No tires mounted on racing wheels at this time Chassis Race prepared, lightened, and all trim/accessories removed 8-point “NASCAR” style cage. Door sectioned with only outer surface remaining. Chassis reinforcing Custom rocker reinforcing, utilizing 14 gauge axially and 20- gauge for stiffening ribs rocker to over-fender frame reinforcing (tube) Tube steel reinforcing between roll cage termination on fire wall, through to strut tower. New passenger seat mounting supports. Mounting point 1.5” above floor panel. Custom extension of floor panel stiffening support, through to unibody subframe directly behind floor panels. 2X corbeau 1-piece racing seats Fire suppression E-pull installed, with fire bottle mounted behind passenger seat on floor panel. expired 5-point harness solid/welded rear strut bar. Custom made, removable front strut bar 11lb Braile AGM battery with custom SS battery box, mounted behind passenger seat. Fiberglass rear hatch 1 Quote Link to comment Share on other sites More sharing options...
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