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Tech Spam thread - because 1/4" BSP gets 5 hand spans to the jiggawatt


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Posted

As I have now bent a couple of runners they have squashed a tiny bit so not nice and smooth on the inside. Im sure this wont make a huge difference either? To bend them I cut some slits and just smashed it over to where I wanted it, then welded it back up so who knows what the inside looks like

 

Either way its going on the car like this

Posted

Saw the old Ja steam trains in Dunners. Tractive force blah blah blah 110kN 110kph. So is the conversion to hp force x distance x speed? Or is the assumption of max force at max speed not legit?

Posted

But that's just converting to distance, and back again via ω?

 

Work = F x d, and P = F x v

but 110kN x 30.5m/s ~3MW, 4000hp, which sounds too high. I was expecting 500-1000hp.

Posted

d = 1.38m, so 

110kN @1.38m/2 = 40kNm

110kph = 30.5m/s, so 30.5 / (3.14 * 1.38) = 7rps, so 60 x 7 = 420 rpm...

 

Power (kW) = Torque (N.m) x Speed (RPM) / 9548.8

P = 40kNm x 420 / 9548 = 1700kW ~= 2300hp

 

 

Still sounds a bit high, the really big Chinese / American steamers topped out at 3000hp 6000hp, I think.

 

Edit: There's the problem, that initial assumption. 7MW curves:

800px-Schematic_tractive_effort_curve.JP

http://en.wikipedia.org/wiki/Tractive_force

  • 2 weeks later...
Posted

Anybody here done any work on cng compressors?

Got some issues with one that's been dumped on me.

Mostly temp related once we are over 160 Bar.

need somebody to chime in about valves and how they should look. Photos tomorrow maybe.

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Posted

can allways bolt more stages on?

 

only if you have laser scanned your engine and engine bay, and you are a total masochist.

 

8v twincam fiat runs the cams in an oil bath so im guessing its probably not a great idea/would just suck all that oil out and cause cam wear.

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  • 2 weeks later...
Posted

this is a better place for this

 

my new car is 'zippy' when cold/warm up enrichment is happening, but slows down to grandma pace once mildy warm. what could cause this?

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