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Old 08-10-2018, 10:05 AM   #21
WUnderwood
 
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Quote:
Originally Posted by Timbeaux38 View Post
So what we have learned here is that we are technically safe up to say, 8259 RPM?
Only the Dinosaurs; if a CR went up that high, it would short circuit.
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Old 08-10-2018, 04:05 PM   #22
Rich dzl
 
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Electronic fuel dump valve , or a fail safe rack design like a Detroit .. possible ? and would anyone buy theses if they was built ?

Last edited by Rich dzl; 08-10-2018 at 04:07 PM.
 
Old 08-10-2018, 05:31 PM   #23
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One lever for both air kill and fuel dump valve. On trucks that are on the edge anyway.
 
Old 08-10-2018, 05:32 PM   #24
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Or two levers side by side and close enough you grab them both easily at the same time.
 
Old 08-12-2018, 12:03 AM   #25
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Originally Posted by jasonc View Post
Or two levers side by side and close enough you grab them both easily at the same time.
This is a great idea and we will definitely incorporate something similar on the build-up this time around. Now to figure out how to make a simple push button or push-lever that is leveraged to reliably pull the fuel dump and the air shutoff at the same time. It sounds like one of those "in your mind 4 hour fab projects" that ends up taking a full week to dial-in perfect... But I'll gladly trade a week of messing around with the safety activation system if it saves the engine... or driver's life!!!
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Last edited by Big Blue24; 08-12-2018 at 12:05 AM.
 
Old 08-12-2018, 10:28 AM   #26
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This is what I came up with...On the left is fuel dump right is air kill, if I swing my arm down they fall right on the knobs. I had to use these when the little bracket that holds the throttle return spring broke on me. Its not a good feeling when you lift on the throttle at the end of the quarter and you gain more speed. cant imagine what went through your mind... my air kill shut it off immediately, next problem is no brakes and power steering is gone and your near the end of the shut down.. hard left hand turn of soft slicks, hope I never experience this again...

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Old 08-13-2018, 10:56 AM   #27
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Quote:
Originally Posted by Big Blue24 View Post
This is a great idea and we will definitely incorporate something similar on the build-up this time around. Now to figure out how to make a simple push button or push-lever that is leveraged to reliably pull the fuel dump and the air shutoff at the same time. It sounds like one of those "in your mind 4 hour fab projects" that ends up taking a full week to dial-in perfect... But I'll gladly trade a week of messing around with the safety activation system if it saves the engine... or driver's life!!!
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Originally Posted by T-MAN View Post
This is what I came up with...On the left is fuel dump right is air kill, if I swing my arm down they fall right on the knobs. I had to use these when the little bracket that holds the throttle return spring broke on me. Its not a good feeling when you lift on the throttle at the end of the quarter and you gain more speed. cant imagine what went through your mind... my air kill shut it off immediately, next problem is no brakes and power steering is gone and your near the end of the shut down.. hard left hand turn of soft slicks, hope I never experience this again...

IMG 4021 - YouTube
For both of you, and any other fast guys... It probably would be a good idea to set it up to deploy the chutes at the same time as well... pulling three levers in the heat of the moment is likely to cause something to be missed while pulling one "oh crap" lever can do it all!!! Would be best with a master and slave setup where they can each be tripped/pulled individually in normal operation then in an emergency the single "oh crap" lever activates the fuel dump, air shutoff and pops the chutes...
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Old 08-13-2018, 12:51 PM   #28
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Holy hell!!!!


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Who remember : rev gain?
Rev Gain is not supposed to be "exponential."
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Old 08-13-2018, 09:13 PM   #29
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Parabolic


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Old 08-14-2018, 09:29 AM   #30
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Engine disassembly 101:
Not like that.

Man that sucks for you guys, sorry to see, but glad you are alright.
 
Old 09-08-2018, 01:16 AM   #31
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Tear-down video update:

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Last edited by Big Blue24; 09-08-2018 at 01:18 AM.
 
Old 09-08-2018, 08:45 AM   #32
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I'm assuming you're running hand throttle. How about when you pull it back to idle, it can go past a detent, and pull further to dump fuel, air, whatever. No searching for a lever, your hand is already on it.
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Old 09-08-2018, 10:02 AM   #33
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Saw a post from Seth that the rack didn't stick . Linkage issue ? Can't wait to see this at ucc again

Last edited by Rich dzl; 09-08-2018 at 10:04 AM.
 
Old 09-10-2018, 11:37 AM   #34
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Saw a post from Seth that the rack didn't stick . Linkage issue ? Can't wait to see this at ucc again
https://www.youtube.com/watch?v=7fS_Vm8MNaM
 
Old 09-10-2018, 06:58 PM   #35
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Nothing for nothing but that rack was moving but it was not at temperature nor under a load? Put that senerio in the mix and see if the rack gets sticky....
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Old 09-10-2018, 07:51 PM   #36
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Can we see what data log was reading before things wound up? I wonder if the injection pump housing was fracturing before the boom......
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Old 09-10-2018, 09:09 PM   #37
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Nothing for nothing but that rack was moving but it was not at temperature nor under a load? Put that senerio in the mix and see if the rack gets sticky....
If a plunger seizes/ hangs that's it- it's stuck and will be stuck until it gets hammered apart at a fuel shop.

Quote:
Originally Posted by RacinDuallie View Post
Can we see what data log was reading before things wound up? I wonder if the injection pump housing was fracturing before the boom......
From my talks with Will and Todd, the data log showed all 6 cylinders at normal exhaust temp through the whole run. Stuck plunger = ice cold cylinder because it's not getting any fuel.

I intentionally hadn't commented or posted until I got the pump back. Pulled the pump out of the box and made the quick video to post what we found. No finger pointing or politics, it is was it is.
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Old 09-11-2018, 12:45 AM   #38
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After the blow-up, we could not locate the throttle return springs so either they were blown off and missed in the track cleanup (unlikely but possible), or the throttle return springs were missed during the rushed slam the engine into the truck and go racing (likely but no one knows for certain). As Seth mentioned, none of the cylinders went cold and the pump internals were in great shape so this is most likely a self-inflicted stuck throttle incident and just so happened to occur when the air shutoff failed. The take-away lesson is make dang sure everything is ready before making a run down the track when you're playing with a 16mm pump and (3) GT55 chargers!!!
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Old 09-11-2018, 05:59 AM   #39
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And hopefully a throttle with a toe catch on it?
 
Old 09-11-2018, 07:05 AM   #40
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I'm still utterly amazed at the fortitude to select neutral in that scenario...
 
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