I’ve been experimenting with turbos. I’ve got my economy up - still working on performance. I tried some experiments. I’m going to put them here, but to save time, this is what they are:
Experiments A, C, E, and G all are based on the same architecture; B, D, F, and H are on another shared architecture.
Originally, the goal was to get a 1.5 liter motor, similar to Honda Civic; hence why A, C, E, and F are based on the 1982-1991 dimensions of that engine, and the others are based on the more recent one.
I was having a problem generating horsepower, but I was able to make the engines more efficient, though not as efficient as others have been able. Only A and E feature cast parts, and have higher efficiencies than the rest, which have forged parts. E is the only car with fixtures, all the rest are just setups to test my motors. Enjoy.
Experiment - A.car (11.2 KB) A: 126 hp 156 lb. ft. tq. 36.3 mpg 72.0 avg rel. 33.37 efficient 1695 cc
Experiment - B.car (11.2 KB) B: 138 hp 150 lb. ft. tq. 33.9 mpg 74.6 avg rel. 29.4 efficient 1544 cc
Experiment - C.car (11.2 KB) C: 127 hp 146 lb. ft. tq. 31.2 mpg 75.6 avg rel 1508 cc
Experiment - D.car (11.2 KB) D: 137 hp 147 lb. ft. tq. 30.7 mpg 74.3 avg rel 1499 cc
Experiment - E.car (30.4 KB) E: 150 hp 203 lb. ft. tq. 33.8 mpg 71.6 avg rel 34.0 efficient 2500 cc V-6 (Originally designed as an inline 6, and acheived much better efficiency, but could not fit in this vehicle)
Experiment - F.car (11.2 KB) F: 189 hp 270 lb. ft. tq. 28.2 mpg 74.9 avg rel. 30.3 efficient 3282 cc V-6
Experiment - G.car (11.2 KB) G: 218 hp 295 lb. ft. tq. 27.1 mpg 73.0 avg rel 30.9 efficient 3320 cc V-8
Experiment - H.car (11.2 KB) H: 219 hp 300 lb. ft. tq. 26.8 mpg 74.3 avg rel 30.9 efficient 3472 cc V-8
I spent the better part of my day off working on this. I’m sure I could push it further, but would it suit my needs? These are modern engines (with direct injection and 5 valves/cylinder), I still need to work on ERA correct engines and getting more POWER.
P.S. If your ears can handle it, this is Experiment J: Experiment - J.car (32.6 KB)
157 hp 235 lb ft. tq. 44.0 mpg 72.1 avg rel. 42.36% efficient 2535 cc Inline 6. No mufflers, so it’s 61.4 db; if you put straight through, it’s still 43 db, and each reverse flow lowers efficiency by 0.1%
Experiment K: Experiment - K.car (32.6 KB)
218 hp 314 lb ft tq 42.8 mpg 70.9 avg rel. 41.46% efficient (with no mufflers @ 66.5 db) 3336 cc Inline 6
Silly engineering question from non-engineer
Why couldn’t one do a dual exhaust on an inline 6? I understand that all the cylinders are in a row, but you could just have a manifold for the 1st 3, and then another for the back 3 (for that matter, you could do the same with an inline 4). I get that it would take up a lot of space, but so does a 5 inch pipe.