8thsin Posted June 28, 2007 Share Posted June 28, 2007 In the process of rebuiding my engine and have been asked if I wish to nitrite the crank and cryogen it (exuse the spelling) Does anyone know if nitriteing it will make it to brittle. Cheers Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 28, 2007 Share Posted June 28, 2007 It already has an induction hardened heat treat, leave it alone. Link to comment Share on other sites More sharing options...
8thsin Posted June 28, 2007 Author Share Posted June 28, 2007 Thank you for taking the time to answer this enquiry Its a new crank that has been cryo'd and balanaced and is going into an engine to hopefully produce approx 1100-1200hp. You wouldn't do anythink else to it?? It already has an induction hardened heat treat, leave it alone. Link to comment Share on other sites More sharing options...
suprafan72 Posted June 28, 2007 Share Posted June 28, 2007 1200hp!! why do u need that much? Link to comment Share on other sites More sharing options...
RobSheffield Posted June 28, 2007 Share Posted June 28, 2007 Drag car iirc Link to comment Share on other sites More sharing options...
suprafan72 Posted June 28, 2007 Share Posted June 28, 2007 Drag car iirc Expensive hobby! Link to comment Share on other sites More sharing options...
SUPRASUZUKI Posted June 28, 2007 Share Posted June 28, 2007 Thank you for taking the time to answer this enquiry Its a new crank that has been cryo'd and balanaced and is going into an engine to hopefully produce approx 1100-1200hp. You wouldn't do anythink else to it?? 1200bhp? Is that all? Link to comment Share on other sites More sharing options...
8thsin Posted June 28, 2007 Author Share Posted June 28, 2007 Ive been racing the car for approx 4 years and the best i got was 10.4 @138MPH with a T88 34D Spun a bearing and the engine came out only to realise the crank was bent. So I bought a new one. My T88 34D was damaged so insted of fixing it, i spent an extra $500au in replacing it with a T88 38 GK. Now I am in the process of having it put back together. and yes a very expensive hobby:( though a rewarding one:D 1200hp!! why do u need that much? Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 28, 2007 Share Posted June 28, 2007 So it's a none stock steel crank? Every crank manufacturer over here sells aftermarket race cranks ready heat treated and balanced. You aren't trying to build such an engine on a stock crank, surely??? You should be looking at something in S312 at least, and I'd probably spec oversize rod journals with custom rods, and bigger diameter tool steel piston pins. Link to comment Share on other sites More sharing options...
RobSheffield Posted June 28, 2007 Share Posted June 28, 2007 replacing it with a T88 38 GK lol nice one Link to comment Share on other sites More sharing options...
8thsin Posted June 28, 2007 Author Share Posted June 28, 2007 Ive got JUN rods and Arias pistons. Excuse my ignorence but what is s312. So it's a none stock steel crank? Every crank manufacturer over here sells aftermarket race cranks ready heat treated and balanced. You aren't trying to build such an engine on a stock crank, surely??? You should be looking at something in S312 at least, and I'd probably spec oversize rod journals with custom rods, and bigger diameter tool steel piston pins. Link to comment Share on other sites More sharing options...
Digsy Posted June 28, 2007 Share Posted June 28, 2007 You should be looking at something in S312 at least, and I'd probably spec oversize rod journals with custom rods, and bigger diameter tool steel piston pins. Is that an SAE spec? That's in the numeric range for stainless, although there's no direct BS equivalent in my Macready's book. What standard is that to? Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 28, 2007 Share Posted June 28, 2007 It is, as far as I recall, a none maraging, vacuum melted aerospace grade of EN40B, now popular for long cranks with either poor pin overlap, or being given a very hard time, and things don't get much harder than an in line 6 crank, turning 1200 BHP, in a drag car Link to comment Share on other sites More sharing options...
AndyT Posted June 28, 2007 Share Posted June 28, 2007 It is, as far as I recall, a none maraging, vacuum melted aerospace grade of EN40B Reasonable quality then? Link to comment Share on other sites More sharing options...
8thsin Posted June 28, 2007 Author Share Posted June 28, 2007 Just searched EN40B and it is a chromium-molybdenum nitriding steel usually supplied in the hardened and tempered condition. Would you know the composition of the standard crank (OEM) and if hardening would make it too brittle. It is, as far as I recall, a none maraging, vacuum melted aerospace grade of EN40B, now popular for long cranks with either poor pin overlap, or being given a very hard time, and things don't get much harder than an in line 6 crank, turning 1200 BHP, in a drag car Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 28, 2007 Share Posted June 28, 2007 Just searched EN40B and it is a chromium-molybdenum nitriding steel usually supplied in the hardened and tempered condition. Would you know the composition of the standard crank (OEM) and if hardening would make it too brittle. I don't know, the stock material spec is something that I tried to research and got no conclusive answers. I wouldn't even consider a stock crank for your application though. Link to comment Share on other sites More sharing options...
8thsin Posted June 28, 2007 Author Share Posted June 28, 2007 I know it sounds crazy but Ive seen in excess of 1500 hp out of a stock crank in a local drag supra engined tube car. I won't be going that far..... From what I've seen (which probably isn't that much) the weakest part of the supra internals - if you're chasing power- is the rods and pistons. So I supose my confidence comes from this, not any particular science. I dont mind if you call me crazy coz there is a bit of madness in wanting that kind of power....[/GRIN][/GRIN] I don't know, the stock material spec is something that I tried to research and got no conclusive answers. I wouldn't even consider a stock crank for your application though. Link to comment Share on other sites More sharing options...
Alex Posted June 28, 2007 Share Posted June 28, 2007 Is your car the 8thsin on Mario's site??? Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 28, 2007 Share Posted June 28, 2007 It is, as far as I recall, a none maraging, vacuum melted aerospace grade of EN40B Reasonable quality then? £2200, in S312 you can choose the stroke and big end journal diameters. £1700 in EN40B, again, choose your stroke or keep it stock Both fully machined, heat treated and balanced. 8 to 10 weeks delivery. Pics of my Skyline one at ftp://ftp.chriswilson.tv/Skyline_Stuff/crank Link to comment Share on other sites More sharing options...
RobSheffield Posted June 28, 2007 Share Posted June 28, 2007 Is your car the 8thsin on Mario's site??? Yeah, iirc marios site is Ex Vi Termini isnt it? Link to comment Share on other sites More sharing options...
8thsin Posted June 29, 2007 Author Share Posted June 29, 2007 Yep thats it. Its been down for a while.(mario can be a bit lazy:) ) Yeah, iirc marios site is Ex Vi Termini isnt it? Link to comment Share on other sites More sharing options...
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