Straub Bushing Trunion Kits?
2400 kits have been sold since Feb and the squealing reports are less than my fingers on 1 hand. Using oil for assembly and install and start same day will work just fine. With assembly then some time before install some grease will be better. The rockers we supply board sponsors with the trunnion upgrade performed we use lube as they may sit.
Again I appreciate the reports on the squeal but it is a very isolated incident. Including the lube packs is a way that I can hopefully give my customers customer an added benefit with the kit. Your are FINE.
Again I appreciate the reports on the squeal but it is a very isolated incident. Including the lube packs is a way that I can hopefully give my customers customer an added benefit with the kit. Your are FINE.
Agreed
I understand it's an isolated incident. My straub upgraded LS1 rockers went in at least a few days after assembly and there was no squeal. But you said it's happened before, and you're saying to reduce the probability of squeal from 0.01% to 0.00%, assembly with lube is recommended. What I'm interpreting from your response is that you recommend I disassemble and reassemble with lube if I want to reduce the likelihood of an incident from 0.01% to 0.00%. That's a chance I may take, but my crazy friend PsychoSid is OCD and will likely want to disassemble. Just asking, is there anything he can do to avoid disassembly?
I understand it's an isolated incident. My straub upgraded LS1 rockers went in at least a few days after assembly and there was no squeal. But you said it's happened before, and you're saying to reduce the probability of squeal from 0.01% to 0.00%, assembly with lube is recommended. What I'm interpreting from your response is that you recommend I disassemble and reassemble with lube if I want to reduce the likelihood of an incident from 0.01% to 0.00%. That's a chance I may take, but my crazy friend PsychoSid is OCD and will likely want to disassemble. Just asking, is there anything he can do to avoid disassembly?
I wasn't clear. Psychosid and I both have a set of ls3 rockers that haven't been run yet. Both of our sets have been installed without lube, both of them have not yet been run. To avoid the squeal and damage, can we do something short of disassembly BEFORE THE FIRST START?
2400 kits have been sold since Feb and the squealing reports are less than my fingers on 1 hand. Using oil for assembly and install and start same day will work just fine. With assembly then some time before install some grease will be better. The rockers we supply board sponsors with the trunnion upgrade performed we use lube as they may sit.
Again I appreciate the reports on the squeal but it is a very isolated incident. Including the lube packs is a way that I can hopefully give my customers customer an added benefit with the kit. Your are FINE.
Again I appreciate the reports on the squeal but it is a very isolated incident. Including the lube packs is a way that I can hopefully give my customers customer an added benefit with the kit. Your are FINE.
Curious to know your thoughts on why only a handful of kits have the squeal. Oviously the ~.2% kits that squeal is low, but is it a tolerance stackup that causes this? I imagine out of 2400 people, more than 5 would have installed the rockers with standard engine oil and not used high pressure lube.
Also, after looking through the thread, it appears due to the the pressing process, there can be bronze flakes on the rocker. Is this to be expected and is there a point at which you would get concerned?
Teching In
Joined: Apr 2016
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I wasn't clear. Psychosid and I both have a set of ls3 rockers that haven't been run yet. Both of our sets have been installed without lube, both of them have not yet been run. To avoid the squeal and damage, can we do something short of disassembly BEFORE THE FIRST START?
Could just be the perfect storm with the few that squeaked. Maybe they sat too long after install and they didn't have enough oil on them, maybe their spring pressure is higher than others, or their rocker geometry isn't quite right or pushrod length, etc etc.
The fact that the sound goes away after a few minutes is a good thing... if it didn't then that would be an issue.
The fact that the sound goes away after a few minutes is a good thing... if it didn't then that would be an issue.
I wasn't clear. Psychosid and I both have a set of ls3 rockers that haven't been run yet. Both of our sets have been installed without lube, both of them have not yet been run. To avoid the squeal and damage, can we do something short of disassembly BEFORE THE FIRST START?
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Verdad Gallardo Chris,
Curious to know your thoughts on why only a handful of kits have the squeal. Oviously the ~.2% kits that squeal is low, but is it a tolerance stackup that causes this? I imagine out of 2400 people, more than 5 would have installed the rockers with standard engine oil and not used high pressure lube.
Also, after looking through the thread, it appears due to the the pressing process, there can be bronze flakes on the rocker. Is this to be expected and is there a point at which you would get concerned?
Curious to know your thoughts on why only a handful of kits have the squeal. Oviously the ~.2% kits that squeal is low, but is it a tolerance stackup that causes this? I imagine out of 2400 people, more than 5 would have installed the rockers with standard engine oil and not used high pressure lube.
Also, after looking through the thread, it appears due to the the pressing process, there can be bronze flakes on the rocker. Is this to be expected and is there a point at which you would get concerned?
, the root of my concern comes from the fact that if there is a tolerance stackup in 1 direction, could it cause additional wear or issues over the life of the product? Where is that percentage coming from? At least 3 have mentioned the noise and you said you've sold 2400 kits....that is 0.00125....which is 0.125%, not 0.00125%. Basically a tenth of a percent. While I agree that engines are like women....on something more "mechanical" in nature , the root of my concern comes from the fact that if there is a tolerance stackup in 1 direction, could it cause additional wear or issues over the life of the product?
, the root of my concern comes from the fact that if there is a tolerance stackup in 1 direction, could it cause additional wear or issues over the life of the product? Actually, 3/2400 is the fraction, to get a percentage you need to multiply the result by 100 to give you a percentage. Hence the .00125 becomes .125%. Feel free to Google it. An eighth of a percent is higher than I'd like to see but since the squeal isn't an actual failure it just has me curious.
Actually, 3/2400 is the fraction, to get a percentage you need to multiply the result by 100 to give you a percentage. Hence the .00125 becomes .125%. Feel free to Google it. An eighth of a percent is higher than I'd like to see but since the squeal isn't an actual failure it just has me curious.
I hate to be that guy, but 3/2400 is 0.125%... but I deal with numbers and calculations all day, specifically when it deals with percent impurities in pharmaceuticals...
I do one test that the limit is 10ppb.
I do one test that the limit is 10ppb.
Back on topic... and let's keep it there at this point.
The issue has been discussed, with a resolution for people who are installing them after a long wait, so let's see if anyone else has any issues moving forward. If not, let's consider this resolved.
I'd hate to see this thread locked down because people just want to bicker back and forth. We have a noise and potential wear complaint, but until an oil analysis is done, or a tear down on those suspect trunions is done, it's all just suspect.
The issue has been discussed, with a resolution for people who are installing them after a long wait, so let's see if anyone else has any issues moving forward. If not, let's consider this resolved.
I'd hate to see this thread locked down because people just want to bicker back and forth. We have a noise and potential wear complaint, but until an oil analysis is done, or a tear down on those suspect trunions is done, it's all just suspect.
there's kind of a big difference in failure rates between those 2 percentages is all. 
So long day at work for me....just getting home. Possibly tomorrow I will have some more data to provide as today was mute.
Chris sent a set of rockers with his bushing kit installed for me to swap out. In return I will send mine back to him for evaluation.
It will be the weekend before I have time to do so. Today I got to thinking that one possible solution is to cross cut oil grooves .005" into the ID/OD of the bushing which will enhance the oiling characteristics. While this certainly adds cost it may solve the issue.
I'm not sure how many bores Chris measured when the kit was in design, however concentricity comes into play here once those bushings are pressed into the bores. (Thinking out loud here).
Chris,
I will shoot you some photos in the morning that I would like for you to see from my inspection of the newly received kit.
Chris sent a set of rockers with his bushing kit installed for me to swap out. In return I will send mine back to him for evaluation.
It will be the weekend before I have time to do so. Today I got to thinking that one possible solution is to cross cut oil grooves .005" into the ID/OD of the bushing which will enhance the oiling characteristics. While this certainly adds cost it may solve the issue.
I'm not sure how many bores Chris measured when the kit was in design, however concentricity comes into play here once those bushings are pressed into the bores. (Thinking out loud here).
Chris,
I will shoot you some photos in the morning that I would like for you to see from my inspection of the newly received kit.
So, after hearing about all of this, I think I have found the solution I am going to follow to ensure that my already installed bushings do not have this "squealing" issue. I'm going to wear a really good set of double hearing protection for the first 10-15 minutes of my start-up. I'm going with the "if a tree falls in the woods and no one is around" philosophy. No harm, no foul, right?