High Revving Force-Inducted Engines: Educate Me Please - Page 2 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Def · 08-14-2008, 11:43 PM

YouTube - Valve Float

Imagine that with another 6k RPM added ontop of that nasty valve float. Two words - dropped valve.

As for the HP goals, even a low pressure(like 10-12 psi) turbo setup on a VH45DE or the like will probably net you your power goals with the stock redline and cams. Hell, a 3L motor revving to 14k RPM NA will probably make about 600 rwhp if it makes power up that high.

The main thing with stupid high RPM and lots of mass like you get in a V8 is that the clearances are so critical that you MUST warm things up before you even really drive the engine, and if you idle/drive it cold you will kill it in short order. F1 engines need to have their coolant and oil up to OPERATING(like 250+ deg F on the oil) before you can even start the engine up, and they IDLE at 6k RPM and have a powerband from about 7-18k RPM(which takes a stupid amount of work and engineering to do on one cam profile). Doesn't sound like an engine you can really drive on the street, or have it last more than a few hours when driving it like you should be.

My take on it - there's a reason why race motors have the word "race" in them.

Bomber 570 · 08-15-2008, 12:22 AM

Yup, thanks for all the info guys, I was just wondering if it was possible, couldnt find my answer, and you guys answered it for me, appreciate it.

P.S. To all you newbie flamers, get a life and find something better to do than flame people asking legitimate questions who are actually trying to BETTER THEMSELVES by increasing their knowledge

Think I'll stick with my plans for an LS2, gonna do some reading up on twin charging, thanks folks

/thread.

08-14-2008, 11:43 PM	#31
Def Post Whore! Join Date: Apr 2004 Location: Houston, TX Posts: 2,701 Trader Rating: (16) Feedback Score: 16 reviews	YouTube - Valve Float Imagine that with another 6k RPM added ontop of that nasty valve float. Two words - dropped valve. As for the HP goals, even a low pressure(like 10-12 psi) turbo setup on a VH45DE or the like will probably net you your power goals with the stock redline and cams. Hell, a 3L motor revving to 14k RPM NA will probably make about 600 rwhp if it makes power up that high. The main thing with stupid high RPM and lots of mass like you get in a V8 is that the clearances are so critical that you MUST warm things up before you even really drive the engine, and if you idle/drive it cold you will kill it in short order. F1 engines need to have their coolant and oil up to OPERATING(like 250+ deg F on the oil) before you can even start the engine up, and they IDLE at 6k RPM and have a powerband from about 7-18k RPM(which takes a stupid amount of work and engineering to do on one cam profile). Doesn't sound like an engine you can really drive on the street, or have it last more than a few hours when driving it like you should be. My take on it - there's a reason why race motors have the word "race" in them.