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toplitzin posted:Wouldn't leaving it in 5th/6th transmit the least torque back to the engine, in theory holding a car better? You've got it backwards. 1st gear is when the engine has the most advantage over the wheels (which is why we have low gears), top gear has the least. Think about it, if you're in an overdrive gear, looking at the power flow backwards through the transmission makes that a reduction gear, making it easier for the wheels to turn the engine over.
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Oct 7, 2015 20:26
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toplitzin posted:Wouldn't leaving it in 5th/6th transmit the least torque back to the engine, in theory holding a car better? No. Think about it this way: in 1st gear, to go 5 mph, the engine has to be spinning at 500 rpm in 6th gear, to go 5 mph, the engine has to be spinning at 20 rpm It takes more oomph to spin an engine at 500 rpm than it does at 20 rpm Ergo, 1st gear holds the car better than 6th.
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Oct 7, 2015 20:26
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You should always park in a gear that will result in the engine turning the normal direction if it DOES move, speaking of which. For example 1st if facing downhill, R if facing uphill. Why? If the motor is turned backwards it can un-prime the oiling system and also spin the timing set backwards. Some engines (IIRC EJ series subarus) really do not like it if the timing belt is turned the wrong direction.
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Oct 7, 2015 20:36
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They're doing the Engine Masters challenge again. https://www.youtube.com/watch?v=LPmGyn3zjlc Here is a video of someone unlikely to become the engine master.
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Oct 7, 2015 20:38
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Gotta love the train of mystified overweight greyhairs piling into the room.
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Oct 7, 2015 20:40
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xzzy posted:Gotta love the train of mystified overweight greyhairs piling into the room. I love the guy pouring water, isn't that the last thing you want to do when you are dealing with the potential of gas or oil on fire?
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Oct 7, 2015 20:44
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It took them a very long and casual span of time to get around to grabbing an extinguisher.
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Oct 7, 2015 22:23
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Slavvy posted:It took them a very long and casual span of time to get around to grabbing an extinguisher. diagnose the point of failure first, extinguish fire second.
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Oct 7, 2015 22:46
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Powershift posted:diagnose the point of failure first, extinguish fire second. I too like my troubleshooting situations to also be on fire.
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Oct 7, 2015 22:55
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That looked more like an oil line coming off, or an oil filter that wasn't tighten up properly
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Oct 7, 2015 22:59
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Powershift posted:diagnose the point of failure first, extinguish fire second. You are clearly not an
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Oct 7, 2015 23:04
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kastein posted:You should always park in a gear that will result in the engine turning the normal direction if it DOES move, speaking of which. For example 1st if facing downhill, R if facing uphill. Why? If the motor is turned backwards it can un-prime the oiling system and also spin the timing set backwards. Some engines (IIRC EJ series subarus) really do not like it if the timing belt is turned the wrong direction. I was told to do it the other way round, as 'the engine is harder to spin the wrong way'. I never really thought about it because I drive auto but is there any truth behind it? One quarter turn of the engine before it caches isn't going to cause a major oiling gently caress up, and I can't see an issue with running the timing gear backwards. Once you get up to two or three complete turns then you may have these problems but by then your car is probably running away down a hill so...
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Oct 8, 2015 00:17
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Anything with VVT isn't going to go backwards well.
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Oct 8, 2015 00:27
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This is a short clip of a Lambo catching fire in traffic. http://i.imgur.com/rE9KrP1.webm Apparently things did not get better but flames mean faster right? http://i.imgur.com/6OXqiuV.gifv edit: fffth fuckin' repost tobu fucked around with this message at 01:21 on Oct 8, 2015 |
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Oct 8, 2015 00:28
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That's exactly the same one that was posted twice above.
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Oct 8, 2015 01:04
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kastein posted:You should always park in a gear that will result in the engine turning the normal direction if it DOES move, speaking of which. For example 1st if facing downhill, R if facing uphill. Why? If the motor is turned backwards it can un-prime the oiling system and also spin the timing set backwards. Some engines (IIRC EJ series subarus) really do not like it if the timing belt is turned the wrong direction. I had a TJ with a lovely parking brake roll back about 50ft, turning the 4.0 backward who knows how many revolutions. Fired right up.
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Oct 8, 2015 03:56
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Shifty Pony posted:I had a TJ with a lovely parking brake roll back about 50ft, turning the 4.0 backward who knows how many revolutions. I've had engines run on backwards. Both OHV and OHC. They ran afterward too. Genuinely surprised with the OHC. Would have half expected it to do something horrible to the chain or guides at very least.
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Oct 8, 2015 05:39
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Shifty Pony posted:I had a TJ with a lovely parking brake roll back about 50ft, turning the 4.0 backward who knows how many revolutions. You probably could've push started that fucker in reverse.
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Oct 8, 2015 08:08
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25cc of four stroke fury with RACE INSPIRED engine design.
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Oct 8, 2015 08:37
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Splizwarf posted:Guy in front of him is taking pics/video with a selfie stick, guy in the carfire throws the horns in response. Ha gently caress I missed that part. Dude is obviously gassing it in response to the selfie stick and the near boiling heat +  gives us this sweet gif
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Oct 8, 2015 09:08
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Godholio posted:You probably could've push started that fucker in reverse. I know what you mean but I've "push" started my wife's old geo backwards down a a hill in reverse. Did it all the time in her old dorm parking lot. Key on, brake off, clutch out in reverse and pop it 15 feet out of the parking spot and bounce.
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Oct 8, 2015 16:45
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ShittyPostmakerPro posted:I was told to do it the other way round, as 'the engine is harder to spin the wrong way'. I never really thought about it because I drive auto but is there any truth behind it? With an auto it's not going to matter anyways because the clutches aren't going to engage without hydraulic pressure, which is produced by a pump run by the neck of the torque converter off of the engine, so until the engine is turning a few hundred rpm nothing is going to make it back through the trans from the wheels regardless. I don't believe engines are any harder to turn the wrong way, the valves are all closed during both the power and compression strokes so it doesn't matter if you're compressing air in the cylinders on compression (turning forward) or power (turning backward). The only difference is you drew that air in through an unfiltered (bad!) unrestricted exhaust system if you're turning the engine backward, or through a closed throttle plate and air filter if you're turning the engine forward. So it's probably actually better for the engine and more effective to do this with the engine turning forward anyways, which implies parking in first gear facing downhill or reverse facing uphill. You just risk more engine damage (timing set on some engines, oiling system, unfiltered air in the cylinders) if you spin the engine backward. Shifty Pony posted:I had a TJ with a lovely parking brake roll back about 50ft, turning the 4.0 backward who knows how many revolutions.  Mr-Spain posted:I know what you mean but I've "push" started my wife's old geo backwards down a a hill in reverse. Did it all the time in her old dorm parking lot. Key on, brake off, clutch out in reverse and pop it 15 feet out of the parking spot and bounce. That's still turning the engine forward, so no issue. I've done the same when I had a failed starter and stalled out facing uphill. In fact I did exactly that in a restaurant parking lot a few weeks ago when my battery died.
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Oct 8, 2015 16:57
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Oct 9, 2015 03:36
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kastein posted:That's still turning the engine forward, so no issue. Good point. I meant backwards. 
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Oct 9, 2015 03:52
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kastein posted:some Subarus have a special sheetmetal thing that wraps around the top of the crank timing sprocket to prevent it skipping teeth for exactly this reason. Most post-70s manual Subarus should have this. It was introduced in either the late 60s or very early 70s as they began to ship cars bigger than the Subaru 360 to the USA and discovered that some cars would jump timing on their way over. It didn't leave the best impression with customers when your brand new weird niche Japanesemobile didn't start when you got it and required it to be re-timed. Chapter 392, "Subaru Engineering Division Hacks, April 2015 Compendium Volume 6"
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Oct 9, 2015 04:57
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FWIW on big slow speed diesels on ships for reverse you just stop the engine, then start it in the other direction. No reduction gear or anything silly like that.
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Oct 10, 2015 01:33
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Seat Safety Switch posted:Chapter 392, "Subaru Engineering Division Hacks, April 2015 Compendium Volume 6" I'd buy this. It would make a hell of a coffee-table book... or mechanic's waiting-room book.
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Oct 10, 2015 01:43
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Mercury Ballistic posted:FWIW on big slow speed diesels on ships for reverse you just stop the engine, then start it in the other direction. No reduction gear or anything silly like that. Yes but aren't they generally two strokes and therefore don't rely on any kind of valve timing relative to the crankshaft?
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Oct 10, 2015 02:33
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ShittyPostmakerPro posted:Yes but aren't they generally two strokes and therefore don't rely on any kind of valve timing relative to the crankshaft? They do, the camshaft actually shifts to a different set of lobes. Fuel timing is different in either direction. These huge engines don't drive their own oil pumps or coolant pumps, though. There are auxiliary generators that take care of such things.
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Oct 10, 2015 03:19
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Well that's pretty freaking awesome.
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Oct 10, 2015 08:48
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They also have an overhead crane so the can lift out an entire piston + conrod and just run the engine without it, if need be.
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Oct 10, 2015 08:56
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bolind posted:They also have an overhead crane so the can lift out an entire piston + conrod and just run the engine without it, if need be. It was rough but it still worked.
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Oct 11, 2015 18:12
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Friar Zucchini posted:That reminds me of the road trip I took with my dad when he'd just changed the spark plugs and one wire wasn't hooked up tight enough, so we were running on 7 cylinders. When I bought my El Camino many years ago, 5 of the 8 spark plug wires had burned through after presumably falling against the engine block or exhaust when the retainer clip they were in broke. It drove 60 miles back home on the remaining 3. V8s dont give a single gently caress.
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Oct 11, 2015 18:16
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Did the extra fuel being dumped through the exhaust eat away at the cat? Had a guy come into the store with an exploded muffler a couple weeks back. Timing was off, causing fuel to end up there through cause it to kaboom. He wanted us to warranty it out. Not really. Guy's a regular and brought it in because he knew we'd get a kick out of it
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Oct 12, 2015 03:29
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QuarkMartial posted:Did the extra fuel being dumped through the exhaust eat away at the cat? Yeah, the cat was destroyed. No idea how long it had been like that but I was 17 and didnt know any better.
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Oct 12, 2015 05:57
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Helped my buddy change out the giubo on his BMW 318ci this weekend and it was a nightmare hellscape of destroyed rubber and fibers and weird polymers:
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Oct 12, 2015 18:05
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Dannywilson posted:guibo I thought you made up that word or misspelled something badly. Of course it's a BMW only thing.
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Oct 13, 2015 03:25
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what the gently caress is a guibo?
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Oct 13, 2015 04:28
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DiggityDoink posted:I thought you made up that word or misspelled something badly. Of course it's a BMW only thing. And 50 year old Alfas. VVV A giubo is like a universal joint designed by joat mon fucked around with this message at 04:34 on Oct 13, 2015 |
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Oct 13, 2015 04:30
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And Fiats. And Mercedeses. A guibo is like a universal joint designed by idiots.
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Oct 13, 2015 04:31
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