WizardBlack Posted September 22, 2009 Share Posted September 22, 2009 Very interesting. Keep up the good info and updates! Quote Link to comment Share on other sites More sharing options...
MAG58 Posted September 22, 2009 Author Share Posted September 22, 2009 What's the stroke on the 3.2 crank? Is it as heavily built as the diesel? Yes, it's equally overbuilt, also equally forged, induction hardened at the journals and micro polished. I believe it's about an 84mm stroke. So about 8mm less. Edit: With the 320 crank, the 280 rods, and 90mm K24 pistons, I will have a calculated CR of 8.8:1 (give or take .2), a 1.78 Rod/stroke ratio, and 3206cc's of displacement. I could spin the motor 8928rpms without hitting the 25m/s mean piston speed. May just stash the crank away for a heavier car that needs some stroke to motivate it Quote Link to comment Share on other sites More sharing options...
Daeron Posted September 22, 2009 Share Posted September 22, 2009 Yes, it's equally overbuilt, also equally forged, induction hardened at the journals and micro polished. I believe it's about an 84mm stroke. So about 8mm less. Edit: With the 320 crank, the 280 rods, and 90mm K24 pistons, I will have a calculated CR of 8.8:1 (give or take .2), a 1.78 Rod/stroke ratio, and 3206cc's of displacement. I could spin the motor 8928rpms without hitting the 25m/s mean piston speed. May just stash the crank away for a heavier car that needs some stroke to motivate it You say "280 rod.." is that 280Z or MB 280?? Going on a rough swag here.. the stroke difference is about 8 mm, if you mean to say that the short stroke, L28 rod, KA24 piston combo will do you OK for piston height, then maybe the stroker crank, an L24 rod (133mm) and a VG30 piston (pin height about 31.75mm) put you near the same height for the reciprocating assemblies. According to this utility http://www.ozdat.com/ozdatonline/enginedesign/ there is a "JUN VG30DETT" piston that checks in at 89mm diameter. Stro-Ker! Stro-Ker! Stro-Ker! Quote Link to comment Share on other sites More sharing options...
MAG58 Posted September 22, 2009 Author Share Posted September 22, 2009 No. The Mercedes Benz 280 Rods. They're 150mm (5.906in) long and a Honda K24 90mm overbore pistons with a compression height of 1.14in. I may still stroke it, it all depends on the cost of each motor. Quote Link to comment Share on other sites More sharing options...
datsun79z Posted September 22, 2009 Share Posted September 22, 2009 Mag58; I noticed the "hammer in hand". Is that a Mercedes tool of some sort? Quote Link to comment Share on other sites More sharing options...
kramerbuccs24 Posted September 22, 2009 Share Posted September 22, 2009 very interesting build, keep us posted! Quote Link to comment Share on other sites More sharing options...
MAG58 Posted September 23, 2009 Author Share Posted September 23, 2009 Mag58; I noticed the "hammer in hand". Is that a Mercedes tool of some sort? Heh, if it was a Mercedes Special Tool, it wouldn't be carried in hand, it would be placed in a highly guarded padded vault with temperature and humidity control as it MOST LIKELY cost more than the house it calls home. That's my father with his favorite ball-joint extraction tool. Quote Link to comment Share on other sites More sharing options...
Daeron Posted September 23, 2009 Share Posted September 23, 2009 No. The Mercedes Benz 280 Rods. They're 150mm (5.906in) long and a Honda K24 90mm overbore pistons with a compression height of 1.14in. I may still stroke it, it all depends on the cost of each motor. okay, sooo... block height? rod big end bore/wrist pin bore/crank journal thickness? We can only Help Hybridize if you give us specs Quote Link to comment Share on other sites More sharing options...
MAG58 Posted September 23, 2009 Author Share Posted September 23, 2009 Deck Height: 219.675mm Origional CR (280CE) 33.275mm Wrist Pin Dia: 22mm Crank Journal Diameter: 48mm (same as 4G63, a bunch of hawn-ders, etc.) Crank Journal Width (320&280): 24mm Crank Journal Width (350SDL): 28mm * Rod Width at wrist pin same as crank journal width Connecting Rod Length: 280 M104: 149mm 320 M104: 144mm Strokes: 280: 73.4mm 320: 84mm 350SDL: 92.4mm I think that's all right... Quote Link to comment Share on other sites More sharing options...
Phlebmaster Posted September 23, 2009 Share Posted September 23, 2009 This is looking good! Quote Link to comment Share on other sites More sharing options...
Daeron Posted September 24, 2009 Share Posted September 24, 2009 SR20, VG30 and VQ series apparently share the 22mm wrist pin, but nissan motors apparently seem to use crank diameters of 51 or 53 mm. I'm basing these conclusions TOTALLY on the info provided at the ozdat calculator I linked to earlier in this thread. Incidentally, I missed the 22mm wrist pin on the VG earlier when I had suggested it be paired with an L24 rod; L-series use 21mm wrist pins. There seems to be a VG30DETT piston at 31.75mm pin height and 89mm bore. If you can find a rod that is just a hair under 141mm long you get to zero deck height with the 94mm stroke crank. (assuming this head has a ~42cc combustion chamber and flat-top piston, this produces 3.5 liters at THIRTEEN TO ONE COMPRESSION!!!! HOOOOHOOOOO!!!) Quote Link to comment Share on other sites More sharing options...
letitsnow Posted September 24, 2009 Share Posted September 24, 2009 If custom pistons are in the budget, I'm pretty sure JE will make you just about anything. Quote Link to comment Share on other sites More sharing options...
Evan Purple240zt Posted September 24, 2009 Share Posted September 24, 2009 ^ So will ross. Quote Link to comment Share on other sites More sharing options...
Guest lulu Posted November 2, 2009 Share Posted November 2, 2009 Wouldnt an acura k20a connecting rod work with slight big end work, it measures 139mm , on a 48 crank journal Quote Link to comment Share on other sites More sharing options...
MAG58 Posted November 2, 2009 Author Share Posted November 2, 2009 That would make for a R/S ratio substantially less than 1.5 which is already too short. Would make piston selection easy though piston accelerations would be through the roof and dwell at TDC and BDC would be nonexistent. Quote Link to comment Share on other sites More sharing options...
JSM Posted November 2, 2009 Share Posted November 2, 2009 Tranny options figured out yet? Quote Link to comment Share on other sites More sharing options...
MAG58 Posted November 2, 2009 Author Share Posted November 2, 2009 Yep. Mercedes CLK series 6 speed manual, 16v flywheel and spec clutch. The 6 speed is a nice, tight Getrag unit that, iirc, is used in many a bimmer as well. Though I'm quite sure I'm going back to the 3.2 displacement. Stock motor at 18psi netted 499rwhp @6500. That's without major computer tuning, basically a 'rough' tune which is plenty of go to hospitalize me sufficiently quickly. Quote Link to comment Share on other sites More sharing options...
KillerBjt Posted November 16, 2009 Share Posted November 16, 2009 NEED UPDATES! haha this thread is like crack, you just keep coming back! Love the swap and now i am thinking about maybe going down this route in the future. Quote Link to comment Share on other sites More sharing options...
82boxima Posted November 16, 2009 Share Posted November 16, 2009 haha, I was just asked if my car was mercedes today, and it made me think of this thread.... how appropriate would it would it be to have one of these in a 1st gen max? :burnout:ROFL very unique swap, I love it!! Quote Link to comment Share on other sites More sharing options...
PanzerAce Posted November 16, 2009 Share Posted November 16, 2009 NEED UPDATES! haha this thread is like crack, you just keep coming back! Love the swap and now i am thinking about maybe going down this route in the future. I don't think he has any updates. Last word I got was he's (and I, for that matter) were looking for someone that'll do wild enough cams. Quote Link to comment Share on other sites More sharing options...
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