Engine Design
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So the priorities are performance, then durability, with fuel economy being a secondary concern? I would go with a cast-iron sleeved aluminum block in either an inline-6 or V8 (maybe inline 8 if it could fit). For a car engine, a DOHC 4V/ cylinder setup would be nice, with variable valve timing a plus. Make it continously variable for bonus points. If you really wanted to get crazy, you could design an electrically operated head. If you actually wanted to build it, I would just use a late model Cobra head or a ported 2JZ (I don't know a whole lot of other options for an inline-6). Either way, get as much displacement as you can in your engine bay. (The DOHC V8 will be limited here.) I would keep it over-square (more bore than stroke), but that's just me. Try to keep the piston as short as you can, but remember that shorter pistons require tighter tolerances. For actual use, forged 4340 rods would be nice. Otherwise, or if you're infinitely rich, titanium. Incorporating a girdle into the design would be a big plus with the V8. Keep compression in about the 9-9.5 range. Multi-port fuel injection and a good tune would be good. Then, depending on your preference, use either a twin-screw blower or turbo with moderate boost, intercooled. Bam! All the power you could ever really use, in a fairly street-friendly package and still probably emissions legal and decent on the gas, depending on the cam and exhaust.
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Just copy the designs of the Toyota 2JZ GTE. I may be a Nissan guy, but I won't hesitate to admit that the 2JZ is arguably the best motor designed in the 90s.
I don't know of any other engine that can make over 1000hp on a stock block.
-Peter
1991 240SX
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out there wrote:
4g63 makes massive hp, probably at least 1000, shep runs sub 9sec at 2650????
Is 2650 supposed to be a hp number?
And I know the 4G is a good motor, but 1000hp isn't as reliable on that motor like it would be on others Granted, I've seen stock block Evos belt out over 500, but anything over 550 is pushing it.
I think the best way to say it, is that a stock cast iron block will take a LOOOOT more power, boost and abuse than a stock aluminum block ever will.
-Peter
1991 240SX
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sorry, 2650lb is shep's race weight.
why can't some good sleeving solve the problem? hasn't a b-series block been pushed to 700+hp? good aluminum block with some hefty sleeves and perhaps some reinforcing should have no problem with the kind of abuse that cast iron takes -
Wow theres a ton of options. I might just stick with a pretty simple inline 4. Maybe 4 valve dohc. The rotary would be awesome but I don't think I have the time or smarts to design it. Where could I find some blueprints or somethin so I could get some design help?
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