Any mechanics out there ??? - Shooting Sports Forum


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Old 10-17-2020, 05:12   #1
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Any mechanics out there ???

https://www.youtube.com/watch?v=UsWW...ature=emb_logo
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Old 10-17-2020, 06:17   #2
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Boy o boy was that a kaboom.

Looked like it came from the bottom end. Probably a crank shaft or rod failure. Diesels are designed as low compression. Even though the failure was massive...much more subtle than the failures you see in the super high compression top fuelers and funny cars.

An expensive run down the track for that gent.

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Old 10-17-2020, 06:55   #3
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I swear that's exactly what my boys have tried to do with my vehicles!
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Old 10-17-2020, 09:30   #4
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Originally Posted by Bepe View Post
Boy o boy was that a kaboom.

Looked like it came from the bottom end. Probably a crank shaft or rod failure. Diesels are designed as low compression. Even though the failure was massive...much more subtle than the failures you see in the super high compression top fuelers and funny cars.

An expensive run down the track for that gent.

Bepe
When I grew like many of you it was up to you to keep your rig and your friends rigs on the road. We also learned when somebody raised the hood on a diesel and asked you to change the plugs, you learned it was compression that caused the explosion in the combustion chamber. Diesels run by high compression values at about double that of the gas engine. Carry on!
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Old 10-17-2020, 11:29   #5
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Kinda brings new meaning to the old term "blew up an engine" now, doesn't it?

"Aye Captain, I'm givin' 'er all she's got, I don't think she'll hold together much longer..."
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Old 10-17-2020, 12:45   #6
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Originally Posted by chill1955 View Post
When I grew like many of you it was up to you to keep your rig and your friends rigs on the road. We also learned when somebody raised the hood on a diesel and asked you to change the plugs, you learned it was compression that caused the explosion in the combustion chamber. Diesels run by high compression values at about double that of the gas engine. Carry on!
Absolutely right Chill. Brain fart before I had my coffee. Ignite the diesel by compression only. What the hell was I typing.

For some reason I was thinking of turbo charged engines. My buddy had a factory turbo Kawasaki back in the day. Docile running bike .....except when it came up on the turbo.....hold the F on.


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Old 10-18-2020, 07:23   #7
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BEPE: Diesels are very high compression engines they run by detonation
no spark required. Glow Plugs are only there to start the detonation cycle.
When they let loose they make a big bang.
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Old 10-18-2020, 08:12   #8
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I was a pro mechanic for some time. In my professional opinion, that ain't gonna buff out.
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Old 10-18-2020, 11:12   #9
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supercharged turbo-diesels do that occasionally
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Old 10-18-2020, 13:34   #10
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My buddies Kawasaki 750 Turbo was running 9.0 : 1 compression from the Factory. Low as compared to many Jap bikes at 10 and 11 to 1. Docile riding at low rpm's around town. Wick that baby up so it got on the turbo and hold on. Would rip your arms out of the sockets. Kind of like the old two stroke beasts when they got up on the pipe..

I was wondering about the turbo diesels compression rate. Diesels being high compression and turbos liking lower compression how they married up.

On a side note....a guy at the local gin mill had a diesel pick up about 10 years ago. Plenty of torque and power but nothing earth shattering. He puts a computer chip in the ignition. Had selection choices like street or racing. He would put the switch on racing and that truck about doubled the output. Black diesel smoke would belch out the exhaust like a locomotive as he smoked the tires for a mile down the road. It was like a complete different engine with the flick of a switch.

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Old 10-18-2020, 16:20   #11
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A glow plug in a diesel assists with cold starting by heating the fuel air mixture. Diesels being compression ignited don’t start good in the cold without them.

A turbo with a diesel increases their efficiency. A higher combustion pressure can be obtained. My wife’s diesel Passat got 50 mpg regularly. Sometimes a little higher. Sometimes a little less in the winter.
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Old 10-19-2020, 05:00   #12
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Originally Posted by Bepe View Post
Absolutely right Chill. Brain fart before I had my coffee. Ignite the diesel by compression only. What the hell was I typing.

For some reason I was thinking of turbo charged engines. My buddy had a factory turbo Kawasaki back in the day. Docile running bike .....except when it came up on the turbo.....hold the F on.


Bepe
hey bepe i own a 94 kawi 900 with a atp turbo kit worked there for 5 years its pretty much a 9 .40 street bike with only 7 pounds of boost it is a blast.and yes i still tide it every now and then.
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Old 10-19-2020, 06:48   #13
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It looks like the block separated down near the crank area. You can only stuff so much fuel/air mix into the cylinder and light it off, before the block itself becomes the weak link.
That's why top fuel blocks are solid aluminum. They take a block of aluminum, and machine off anything that doesn't look like a chrysler hemi. No water jackets, etc. The engine is cooled by the fuel and the oil itself.
And they burn a metric crap load of fuel. Before shortening the track to 1000', a typical top fuel dragster would burn on the order of 20-30 gallons of nitro to make a pass. The fuel line from the crank driven fuel pump to the injector hat and head injectors starts off as 3" in diameter. Those engines make somewhere between 9-13 thousand horsepower, usually stay together for about 30-45 seconds, and the block and crank are the longest lived parts, aside from the cylinder heads. As long as the engine doesn't grenade, or hydraulic, the crank will last about 20 runs, the block 30-40, and the heads are usually toast around the 50 run mark.
The physics involved in a top fuel style engine are simply mind-boggling. I got to tag around the Budweiser top fuel team the summer between my junior and senior high year.
A typical pass down the quarter mile(then), cost about $200,000, barring any catastrophic parts breakage.
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Old 10-20-2020, 14:09   #14
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We all chipped in and rented the Pueblo track for a day when I was road racing. The guy that started our group renting was a formula ford racer. no wheel to wheel so we had to stay separated (lol) social track distancing. Anyway I brought my new V45 interceptor I had the second on delivered in Colorado Springs. Another guy our lead guy knew was a bike mechanic and he brought his new Kawa 750 turbo. We swapped bikes for a bit after we had a discussion about clutch shifting and max rpm, initiated by me. I said stay 10k rmp or less and use the clutch for up and down. The V45 would eat that thing alive on the track. The binary power on/off was remarkable and a rider would really have to work on rpm management to be track fast. I had a hard time getting that guy off my V45. But it was a fast bike. I could not close on that dam formula ford though 4 big fat sticky tires just have more traction than my two tires, and that was our longest track which I really liked. Ahh the good old days.
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Old 10-20-2020, 14:49   #15
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The good old days they were.

1977 I bought a KZ1000 new. Rode it a couple years and downsized to a 1978 Yamaha RD400. Tore the top end off and put the RD350 pistons in to up the compression. The RD350 and 400 were the same bore and stroke. The 350 pistons were higher dome than the 400 pistons. That's where Yamaha picked up the extra 50cc's. The 400 was lower compression than the 350. Put a set of K&N airfilters...expansion chambers and jetted the carbs.
Dam bike was insane. It would come up on the pipe and carry the front wheel for three gears.

Couple years later, I was at a red light when a doofus on a V65 pulls up next to me. The V65 had just been introduced and I could tell this idiot was a silver spoon brat who was clueless. He was riding his buddy...bitch... wearing shorts and sandals. The hot shot looks over at me and asks me "wanna run it". When the light changes I said.

Smoked that idiot for about a quarter mile. I shut down and then he passes me at about 130 mph. Next light he looks over to me and says "that thing is fast". Boy those two strokes were fun.

Bepe
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Old 10-20-2020, 16:47   #16
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Well two up slows em down a lot, and you said compression again. The RD's have a pedigree from the track. My first street bike before I had a license to drive was a dam ugly slozuki 250 x6 hustler. The guy thought it was shot but it just needed the dual points set up properly as I recall. Once dialed in there I was a 14 year old flying down I-25 at 110 with weather rotted tires! But I was hooked.
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Old 10-23-2020, 07:56   #17
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Originally Posted by RIBob View Post
I was a pro mechanic for some time. In my professional opinion, that ain't gonna buff out.
Sorry but a pro mechanic knows not to reuse headbolts..
This was just to ruffle you feathers. Ha Ha!
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