I'm showing the fs65...of course i know everyone seen a school bus but i'm showing a specific model #SuchHate
Yes, but you can fix a 5.9L ISB Cummins with swear words. Who cares if it produces less horsepower than Belgium? Torque is off the scale at 460 lb-ft. I'd pretty sure that buses are just built for reliability sake.
Exact same goes for the series 71 though. Quite low horsepower figures on paper but huge amounts of torque. Plus its a 2 stroke, and I don't mean a crappy little crankcase scavenged, carburetted, ported 2 stroke like in a weed whacker, its a big boy. Fuel injected. Actually mechanically controlled from the camshaft which is kinda neat, but its a 1938 design originally so no electronic systems there. By injection occurring after the exhaust valve closes, you completely eliminate the "simple" 2 stroke disadvantage of unburnt fuel being ejected in the exhaust during the scavenge cycle. True exhaust valves, either 2 or 4 depending on exact model. Still retains inlet ports rather than valving those, there is little benefit to valved inlet on a 2 stroke so instead the mechanical reliability of ports in the cylinder lining reigns king, however having a valved exhaust allows for higher compression without requiring specially tuned pipes and also allows inlet air entering the bottom of the cylinder to fully scavenge the exhaust through the top (on the simple designs, having both intake and exhaust at bottom of the cylinder tends to cause the effect of the intake air not fully pushing all the exhaust gas out, some stays in the top of the cylinder and some of the intake air/fuel mixture goes straight out the exhaust). True pressurised oil system like on a 4 stroke car engine. None of that bullshit with mixing lubricant in with the fuel for your weedwhacker. It has a normal wet sump oiling system in the crank case. The wet sump oiling and larger cylinder count makes the old crankcase scavenging inconvenient/impossible (or basically a cheap 2 stroke uses the piston moving down into the crankcase as a crude supercharger, think about it, its like a bike pump), the massive roots blowers that the hot rodders all used to use, stolen from a detroit diesel as standard equipment. All 2 strokes require forced induction. The cheap ones as I mentioned cheat and use the crankcase as a supercharger. These proper ones are typically turbocharged (which really complicates starting as you need to spool the turbo before starting the engine somehow, that tends to be reserved for ships and industrial applications where they never shut the engine down or vary the throttle) or supercharged. The detroit diesels had a roots supercharger, I think the V16 and V24 models had 2 or 3 and some models also had turbocharges feeding into the superchargers. Basically you could treat them as a bog standard diesel engine. They took bog standard automotive diesel. Turn the key, it starts the same as any other engine. It has a normal dipstick for checking the oil and a lovely filler cap for refilling it. It was watercooled so you have a coolant tank and a radiator. Came in various inline and V configurations. It was all rather normal (and was indeed in use on old yellow schoolbuses from some manufacturers). But, it was a 2 stroke and it was a monster. A fuel guzzling high emissions monster. 2 strokes using a very similar design have actually been built more recently and do tend to rival our standard 4 strokes for power, fuel economy and even emissions these days so its not off the table for a car manufacturer to release a 2 stroke car with its operation and maintenance indistinguishable from a 4 stroke to the end user, but, they won't. The detroit is inefficient mostly due to it being a 1938 design, its old. I think the only major disadvantages to a 2 stroke car being released these days are a) so many people probably won't understand how the 2 stroke really works and will probably immediately come up with the association of having to mix oil into the fuel etc so won't buy it and b) during the extra 2 cycles on a 4 stroke the engine has a little time to cool, I think a 2 stroke does tend to run a bit hotter so would need better provision for cooling. As of 1995. The detroit 2 strokes do not pass emissions standards in the US. Instead they now manufacture boring old 4 stroke diesels and of course nobody does the 4 stroke diesel as well as cummins does. And that went way way off topic. Sorry.
watch any youtube video on how 2 stroke engines work (trust me, they all assume the cheap/simple style of 2 stroke engine, fair enough as that is encountered most often but means they arent technically 100% true, especially when they start listing pros and cons - particularly cons). Then replace the part where they mention the fuel/air mix being carburetted into the crankcase with the underside of the piston compressing it through an inlet port, swap for direct injector for fuel in the cylinder and air being compressed by a supercharger through the inlet port. Then swap the exhaust port being uncovered by the piston for an exhaust valve ontop of the cylinder like in a 4 stroke. And of course as its a diesel, get rid of the spark plug (however its possible to have a spark ignited engine operating in this very same way, Lotus built one running on ethanol based fuels)
Caterpillar C7 You're showing one of the most widely-used buses ever. So yeah, we've probably all seen one or even ridden in one
Haha that's the same pic I was using I'll try to add mor details, but most of it should be done with textures. I'll try to do some textures but I'm not very good at it I've gotta go to bed, I'll work on it in the morning
Well all of the tubing would need to be modeled in, as well as some other minor details. Then it should be perfect - - - Updated - - - Working on the bonnet some more. It looks even more wrong now but that's the first step to making it look right haha. (imported from here) - - - Updated - - - Starting to look better - - - Updated - - - Also looking for modelers for bus mirrors. http://upload.wikimedia.org/wikipedia/commons/e/e9/2005_Thomas_Built_Freightliner.jpg About the mirrors on the hood. I will provide a file soon with the mount positions if you are interested in doing these.
