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The stroke is not necessarily shorter, but the rods and their crank mechanism will be adding a lot of reciprocating weight that has to change direction with each stroke.
I remember a sprint car with 4 Kawasaki 750 triple cranks, 2 rows of 6 cylinders, 12 pistons. I think it made 1,600 hp.
Wait a minute. That's 3 liter/ 180 CI. ??? 1600Hp ??? In the lab maybe, at 20K rpm. In a sprint car 850+ hp at 9K kicks butt. I am not even sure you can get 1600 hp to hook-up in a sprinter. Maybe I am a bit out of date. If it's real, let me know. Make me eat my words!!
!"Life is not about waiting for the storms to pass...it's about learning how to dance in the rain."
The 2 stroke Detroits were only rated at 2350 rpm @ roughly 300 hp with turbo,about 230 hp without the turbo. When the 6-71 was last produced for the marine industry they were turbocharged and intercooled and were rated at 485 hp. Thats more than 1hp per cubic inch! (426ci)
Last edited by PROPDOC; 03-14-2009, 07:24 PM.
Reason: spelling
Gardner Miller
Lone Star Outboard Racing Association
"Water is for racing. Asphalt is for the parking lot."
Rember....Freedom isn't...."Free".......
Wait a minute. That's 3 liter/ 180 CI. ??? 1600Hp ??? In the lab maybe, at 20K rpm. In a sprint car 850+ hp at 9K kicks butt. I am not even sure you can get 1600 hp to hook-up in a sprinter. Maybe I am a bit out of date. If it's real, let me know. Make me eat my words!!
I think you are right, I must have accidentally doubled the power on that motor in my head. It must have been 800 hp, not 1600.
You are right about the Detroit Diesels too .... but I don't know where they come into this discussion, they are not multiple piston per bore motors like the others.
The three remarkable aspects of this motor is the high power per pound of engine weight, the high power per cubic foot of engine space, and the near perfect balance.
Downside is it requires a electric assist turbocharger, the pistons and barrel run at very high temps [because there is no head area to flow the heat out of the combustion chamber(s)], and oiling/cooling of the wrist pins is an issue, again due to the high operating temps.
But, an interesting design, and may just have an application.
Brian Hendrick, #66 F "the harder we try, the worser it gets"
I, m sorry if i'm off track , i guess i just noticed the 2 stroke and auto part , a fellow i knew was a navy diesel man an let me tell ya' 2350 aint nothing ' 1 i had 1 was marked 2150 needless to say gone , gone.
Thing is they weighed a lot more than a 1/2 ton chevy liked. 'Nother thing, mpg. was pretty crappy. I bet that multiple cyl. was too.!!!
I, m sorry if i'm off track , i guess i just noticed the 2 stroke and auto part , a fellow i knew was a navy diesel man an let me tell ya' 2350 aint nothing ' 1 i had 1 was marked 2150
I worked on some Gray 6-71's (forerunner of Detroits) that were governed at 1,800. They were from around 1930 ... and where ever they are, I bet they are still running.
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