NZeder Posted July 15, 2009 Posted July 15, 2009 I was doing a bit of reading over on classicz and saw about 20 years ago EKW had an s20 engine for sale which was promtly snapped up by someone from England but I think Alan on this forum now owns it, pity I was only about 15 I would have liked to have bought it myself! Alan has more than one S20 I have been lucky to see some of the special parts he has and his KPGC10 (genuine Skyline GT-R) and his Z432-R replica project. 20 years ago was driving around in a zed lol but it was not mine it was a mates who just left school at 15 and it was the first car he purchased and so it began. So Ben what is the plan with the OSG head? Which car? Quote
BenZed Posted July 15, 2009 Author Posted July 15, 2009 At this stage I am planning to put the OS engine in the Zed and possibly put the L32 into my KHGC110 or maybe sell it to help pay for the OS engine Quote
BenZed Posted October 15, 2009 Author Posted October 15, 2009 OK, Stop Press! I just got back from Singapore Auto Salon and had a long discussion with OS Giken manager Izumori-san about the TC24. Apparently the old castings will not be used. New moulds have been produced (same design) to suit more modern casting methods and create a higher quality end product. At this stage they are planning to make at least 15 heads. Headers will be made to order depending if the car is a Zed or Hakosuka. The complete bottom end with full-counter-balanced crank will be capable 10,000rpm! These will be sold ready-assembled as the L28 block needs a number of modifications to suit the stroker kit, including a brace to prevent torsional flex. They have already taken one order for an extreme race engine using a dry-sump set up. Now for the pricing (sit down first). The complete head (with cams, valvetrain, head gasket, inlet and exhaust manifolds etc) will be around 3.3 million yen in Japan, a complete engine with the bottom end will be around 5.5 million yen. The full-house engine with 50mm six-throttle injection and dry sump system will be over 7.2 million yen. If the TC24 can sell more than 15 units then the pricing will come down, but as there are so many parts to make in a short run they can't make it any cheaper just yet. I have a brochure which I'll scan and post up here soon. Quote
S30Mike Posted October 15, 2009 Posted October 15, 2009 I want a TC24 kit under my bonnet.. for the price of a full kit you could buy a 370z haha. I know what choice i would make Im just looking forward to hearing the sound.. L28 with triples arleady sounds hot, cant imagine what this thing will sound like! Quote
zr240 Posted October 15, 2009 Posted October 15, 2009 Man that is soo much money I rekon you could make and engine for less maybe buy in a 370z twin turbo motor. Sure its a cool its cool but I think an RB is a way better and cheaper and more advanced motor ash Quote
Ben Posted October 15, 2009 Posted October 15, 2009 How many members of my family will I need to sell to fund one of these kits? I'll take one with minimal boring and a set of dished pistons thanks! (How many HP would an OSG stroker make with 20psi boost?) I guess I should start saving so I can buy one in 15 years' time... Quote
BenZed Posted October 15, 2009 Author Posted October 15, 2009 I recall reading on a Japanese site that only 11 TC24-B1 were made (however it might have been lost on the translation) and their might have been 11 of these head casting left after the production ceased. I found this good pic of break down on the OS Giken TC24-B1 head. I checked, yes only 11 were completed Quote
BenZed Posted October 15, 2009 Author Posted October 15, 2009 These are scans from the original twin cam brochure printed in the early eighties. The first scan shows the completed engine and talks about how they used know-how from developing the TC16MAII twin cam head for the L18 to make the six-cylinder version for an L28 based high-power, high-rpm engine. The second scan shows the 500+ parts needed to assemble the head. The third scan is the specifications for the engine built in 1982 for the SCCA Pro Rally in Nevada. Here is a translation of the essentials: Engine Specifications 6-cylinder, water cooled, 2870cc, 87.8mm bore, 79mm stroke, 11:1 compression, 325ps at 7400rpm (239kW), 33kg.m at 6100rpm (323Nm), 9000rpm redline, twin cam, four-valve/cyl, 48-50mm Weber carburettor. Cylinder Head Data Cast aluminium, DOHC, Pentroof combustion chambers, 20° valve inclination, 35° intake port angle, 35.2mm intake valves, 30.5mm exhaust valves, 6.6mm valve stems, double valve springs, 298° cam duration, 10.5mm valve lift, timing chain, special steel (chrome moly?) cams, cast alloy cam holders Quote
dat2kman Posted December 26, 2009 Posted December 26, 2009 Cool, A six cylinder version of my four cylinder! 88mm stroke, 93mm diam pistons, t/c head full counterwieight crank, h beam 140mm rods, drysump oil setup All stock from Nissan UK engine builder Blydenstein! 55mm dcoe webers 290hp at 9600 rpm Waxhead saw it last week! Its going back into the 120Y soon Quote
bluerat Posted December 26, 2009 Posted December 26, 2009 Hey Jase, Billy's the Man!! You've got all the boy's down here in Tassie pumped to see the beast back in action. Sorry about the highjack!! Fantasic engine Ben, but does that add up to $1000 per Hp over a good L31? Quote
dat2kman Posted December 28, 2009 Posted December 28, 2009 Unfortunately Bill Blydenstein passed away during 2009, RIP Thanks to Kameari (Japan), Reg Cook ( FJ Guru in NZ) and some USA suppliers, and the assitance of Ben Diggles ( Fastest S12 Gazelle in the world) and his uncle Jeff Watson ( Healey Sprite FJTurbo beats Victor Brays Chev doorslammer) the FJ 24 is back together The Y will be coming out to play sometime in 2010 with a possible trip to Victoria later in the year. Getting back to the Giken jobbie, there are so many similarities to the original Nissan factory LZ twincams it is uncanny. There is one here in Qld, ( given to it's current owner by Howard Marsden in a works Stanza rally car, as a "factory backdoor special") and one also in Vic ( Feral) (The FJ t/c's are wider in the upper end) Quote
BenZed Posted December 28, 2009 Author Posted December 28, 2009 Hey Jase, Billy's the Man!! You've got all the boy's down here in Tassie pumped to see the beast back in action. Sorry about the highjack!! Fantasic engine Ben, but does that add up to $1000 per Hp over a good L31? In terms of $ per hp I admit the OS motor does not make sense at all. It would actually be cheaper to build a high-compression version of the OS Giken RB315 (see Otomoto website) which would have the same rpm capacity and your choice of RB valvetrain upgrades. It's really just a question of how much you want to keep an L-series. If you want big atmo power you need big rpm and only a twin cam head will deliver the airflow to keep up with 10000rpm. Plus, as many people have noted, the OS engine looks and sounds fantastic. Quote
BenZed Posted April 5, 2010 Author Posted April 5, 2010 For those who are interested in just the bottom half of the OS Giken L-series, they now have a 3.2-litre kit available, using a fully counter-weighted crank with 86mm stroke, which gives 3208.4cc capacity with 89mm pistons. The kit includes forged chrome-moly conrods and forged aluminium pistons. For more details check out the info from OS Giken below. The local price in Australia Japan for the crank, conrod and piston kit (without bearings) is $14,500 OS Giken Engine Parts for Nissan L Type Engines Crankshaft Material---Chrome-molybdenum Full Counter Stroke OS 86mm (Nissan OEM 79mm) Pin Width OS 21.7mm (Nissan OEM 27mm) Pin Diameter OS 48mm (Nissan OEM 50mm) Please use connecting rod bearings of Nissan OEM RB26DETT (Please purchase them at Nissan parts.). Please use a key enclosed in the kit which is modified to 1 piece. Description OS Giken stroke is 7mm longer than Nissan OEM L Type engine. If it is used with diameter 89mm pistons, engine displacement becomes 3208.4cc. Pin Width is 5.3mm narrower than Nissan OEM L Type engine by using Nissan RB26DETT connecting rod bearing. Piston Material---Forged Aluminum Pin Height OS 29.4mm (Nissan OEM 38.1mm) Pin Diameter OS 20mm (Nissan OEM 21mm) Pin Length 61mm Diameter---Please choose one from followings (87mm, 87.5mm, 88mm, 88.5mm, 89mm, 89.3mm, and 89.5mm). Description Semi-order system---Please designate piston diameter, valve recess shape, pin height and etc upon orders. Please contact us for details. Conrod Chrome-molybdenum and Forged (Main body parts and caps are forged separately.) PCD OS 135.5mm (Nissan OEM 130.4mm) Big End Width OS 21.5mm (Nissan OEM 26.8mm) Big End Diameter OS 48mm (Nissan OEM 50mm) Please use connecting rod bearings of Nissan OEM RB26DETT (Please purchase them at Nissan parts.). Small End Diameter OS 20mm (Nissan OEM 21mm) Description Connecting rod bolts are redesigned for higher RPM and horse power applications. General Warning ※ Please be aware of potential risks and hazards when installing our products. We do not take any responsibility for any loss and/or injury occurred when our products are modified, re-used and/or ill-fitted. ※ All OEM information on this sheet is based on Japanese Domestic Model vehicles and may not be applicable in your country. ※ Specifications may be changed without notice. Quote
NZeder Posted April 5, 2010 Posted April 5, 2010 Interesting to see with this kit they have moved to a more modern bearing sizing (as in the RB26DETT) I know that finding good race bearing for the L6 these days is limited to just a few suppliers but there are currently many for the RB engines so I assume this is one of the reasons for this move - make sense really. Quote
BenZed Posted April 6, 2010 Author Posted April 6, 2010 Narrower conrod pin width on the crank probably helps rigidity too. This bottom end is designed to suit 10,000rpm+ though you would probably want to brace the block to stop it twisting too. Quote
BenZed Posted July 28, 2010 Author Posted July 28, 2010 Speedhunters just did a story on OS Giken, which has some shots of the new TC24B1 bits http://speedhunters.com/archive/2010/07/27/gallery-gt-gt-a-quick-stop-os-giken.aspx Quote
Administrators gav240z Posted February 28, 2013 Administrators Posted February 28, 2013 Bump... http://www.speedhunters.com/2013/02/engine-porn-os-giken-tc24-b1z/ Quote
Moderators Zedman240® Posted February 28, 2013 Moderators Posted February 28, 2013 Buying a lotto ticket later today.... It must be the same OS company that make the small nitro engines for planes and cars? Quote
Zedric Posted May 28, 2013 Posted May 28, 2013 Bump... http://www.speedhunters.com/2013/02/engine-porn-os-giken-tc24-b1z/ Have you heard of that weird psychological disease where people are sexually attracted to inanimate objects? I think I have that now!!! Quote
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