Post by 90GTVert on Jan 15, 2023 0:58:39 GMT -5
Anyone ever heard of heating a partially assembled engine with the intention of stress relief? As usual, this is from a YouTube comment. In my RC-One assembly vid comments, I'm told I could have placed the whole engine in the oven at 220 Celsius (428F) for 8 hours. I told him I have a small collection of material about professional and competition engine building (though it's basically all catered to large automotive engines) and I've only ever heard of stress relief processes on individual parts pre-assembly. I have heard of other assemblies being stress relieved in some manner, but not engines.
To make it really a bad idea, 428F is well beyond any recommendations for heat that I've read from bearing manufacturers for any bearings that we'd be likely to use in these. Then there's the matter of sealants and certain types of gaskets (assuming this would be prior to any seals being installed).
I asked for any reputable information source that could be shared and he replied that his word is his advice. We all know to just trust random strangers at their word.
I assume his thought is that you'd alleviate any uneven stress that could happen during assembly, especially with heating and cooling methods. I'm not cooling anything to cryogenic levels and I'm heating to roughly 250-300F for assembly. It's not like the engine runs at an even temperature all over when it's in use either.
The same person has scrutinized my vids lately even to things like saying my tools look new and silicone that I used was new today. Yeah, I have new tools and tools from the 80s that I use regularly and I've yet to buy a never-ending tube of sealant. The use of nitrile gloves was criticized for lack of feel. All sorts of stuff. This sounds like a load of crap to me from yet another know-it-all that has to tell me everything I do wrong in their eyes... but I was curious if anyone has ever heard of an assembled (at least crank and bearings in cases) engine being cooked. In maybe 15 years of talking to people on this and other scoot forums, some of whom are very smart and push boundaries, I've never seen an engine baked post crank install. I can't help but be curious if there's some internet rumor or top secret backroom engine building story that has inspired this idea.
ADDITION : As I was typing this, the person commented back that they are a professional engine builder/machinist and that it should be done but that's my choice. Then they deleted the comment almost immediately. EDIT : Now he's deleted a bunch of comments. Troll or not, I'm still curious where this idea may have originated.
To make it really a bad idea, 428F is well beyond any recommendations for heat that I've read from bearing manufacturers for any bearings that we'd be likely to use in these. Then there's the matter of sealants and certain types of gaskets (assuming this would be prior to any seals being installed).
I asked for any reputable information source that could be shared and he replied that his word is his advice. We all know to just trust random strangers at their word.
I assume his thought is that you'd alleviate any uneven stress that could happen during assembly, especially with heating and cooling methods. I'm not cooling anything to cryogenic levels and I'm heating to roughly 250-300F for assembly. It's not like the engine runs at an even temperature all over when it's in use either.
The same person has scrutinized my vids lately even to things like saying my tools look new and silicone that I used was new today. Yeah, I have new tools and tools from the 80s that I use regularly and I've yet to buy a never-ending tube of sealant. The use of nitrile gloves was criticized for lack of feel. All sorts of stuff. This sounds like a load of crap to me from yet another know-it-all that has to tell me everything I do wrong in their eyes... but I was curious if anyone has ever heard of an assembled (at least crank and bearings in cases) engine being cooked. In maybe 15 years of talking to people on this and other scoot forums, some of whom are very smart and push boundaries, I've never seen an engine baked post crank install. I can't help but be curious if there's some internet rumor or top secret backroom engine building story that has inspired this idea.
ADDITION : As I was typing this, the person commented back that they are a professional engine builder/machinist and that it should be done but that's my choice. Then they deleted the comment almost immediately. EDIT : Now he's deleted a bunch of comments. Troll or not, I'm still curious where this idea may have originated.
