Blown Motor!!??
04-09-2019, 08:45 PM
#151
Like I said, I fully agree that if the engine gained momentum before hitting the lock it's very likely to bend the rod. However Bill said his engine didn't gain momentum.
04-09-2019, 08:45 PM
#152
Just a car guy
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Sometimes a little humor goes a long way. Especially during these trying times....
So Bill. Get a few rolls of duct tape. And keep your....never mind...
04-09-2019, 10:18 PM
#155
Burning Brakes
04-09-2019, 10:22 PM
#156
Rennlist Member
[QUOTE=Flat6 Innovations;
Raby-Out.
Good decision.
Raby-Out.
Good decision.
04-09-2019, 10:40 PM
#157
BTW - I'm pulling for you Bill!
04-10-2019, 02:56 AM
#158
Race Director
Good job, Boxman!! I enjoyed following the math logic throughout.
No guarantees, but from your calculations, I agree... a good chance his motor is not toast.
Ever read my blown motor thread here?
No guarantees, but from your calculations, I agree... a good chance his motor is not toast.
Ever read my blown motor thread here?
04-10-2019, 11:40 AM
#159
You mean the longest topic on the forum? Well I have now.. :P Great read.
I slightly edited the calculation in the meantime, I found a few minor errors and I sourced more accurate numbers on cylinder pressure. The results don't differ that much, the 'dangerzone' window grew by 2 degrees crank.
I slightly edited the calculation in the meantime, I found a few minor errors and I sourced more accurate numbers on cylinder pressure. The results don't differ that much, the 'dangerzone' window grew by 2 degrees crank.
04-10-2019, 12:41 PM
#160
You mean the longest topic on the forum? Well I have now.. :P Great read.
I slightly edited the calculation in the meantime, I found a few minor errors and I sourced more accurate numbers on cylinder pressure. The results don't differ that much, the 'dangerzone' window grew by 2 degrees crank.
I slightly edited the calculation in the meantime, I found a few minor errors and I sourced more accurate numbers on cylinder pressure. The results don't differ that much, the 'dangerzone' window grew by 2 degrees crank.
04-10-2019, 01:05 PM
#161
With all due respect, what has taken you two days to formulate, basically Raby summed up in a few sentences. I have a love for science, but I can't see how something with so many unknown/unseen variables can be quantified. Now if the engine goes through a disassembled post-failure anaylsis, that would be a game changer. It will be interesting to see once the motor can be started if any internal damage has occurred from the AOS failure.
What exactly are the unknowns in your opinion? The forces are calculated in an exact manner based on this particular engine's specific dimensions, down to 0.1mm precise. With rigid bodies like these the analysis is really straightforward. The only true 'unknown' is the actual safety margin on the conrod, but the analysis provided gives a clear and definite lower boundary based on the forces your conrod experiences every day.
Also "two days", I mean, you know this forum has timestamps, right?
04-10-2019, 01:17 PM
#163
Rennlist Member
What he didn't want to back up with anything other than "because I say so" (unverifiable, unfalsifiable), I indeed formulated in a definite manner that is verifiable by anyone who has basic physics and maths skills. If you don't see the value in that, I doubt you actually have a love for science.
What exactly are the unknowns in your opinion? The forces are calculated in an exact manner based on this particular engine's specific dimensions, down to 0.1mm precise. With rigid bodies like these the analysis is really straightforward. The only true 'unknown' is the actual safety margin on the conrod, but the analysis provided gives a clear and definite lower boundary based on the forces your conrod experiences every day.
Also "two days", I mean, you know this forum has timestamps, right?
What exactly are the unknowns in your opinion? The forces are calculated in an exact manner based on this particular engine's specific dimensions, down to 0.1mm precise. With rigid bodies like these the analysis is really straightforward. The only true 'unknown' is the actual safety margin on the conrod, but the analysis provided gives a clear and definite lower boundary based on the forces your conrod experiences every day.
Also "two days", I mean, you know this forum has timestamps, right?
04-10-2019, 01:23 PM
#164
Rennlist Member
With all due respect, what has taken you two days to formulate, basically Raby summed up in a few sentences. I have a love for science, but I can't see how something with so many unknown/unseen variables can be quantified. Now if the engine goes through a disassembled post-failure anaylsis, that would be a game changer. It will be interesting to see once the motor can be started if any internal damage has occurred from the AOS failure.
04-10-2019, 01:38 PM
#165
Burning Brakes
With all due respect, what has taken you two days to formulate, basically Raby summed up in a few sentences. I have a love for science, but I can't see how something with so many unknown/unseen variables can be quantified. Now if the engine goes through a disassembled post-failure anaylsis, that would be a game changer. It will be interesting to see once the motor can be started if any internal damage has occurred from the AOS failure.
Unfortunately, there is no easy way for Bill to determine the status of the rod, that I am aware of. Worst case is he fires it up and it appears to run well and then has a catastrophic failure at 7000 RPM under load. Thats the way it goes with mechanical stuff sometimes.