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@mintJulep They say the heat has gone but I disagree ! this summer has been horrible Im at Kawagoe for the motocross that will be fun! Stephen

Quote" Note- afeter calculation oil flow rates for valve guide lubrication fall between approximately 1.94 10−8 and 2.78×10−7 cm³/s. 3.Recommendations for Improvement Given that you are experiencing high rates of valve guide wear due to inadequate oil supply: Consider using an oil with...

Different materials are going to require different amounts of lubrication. It's important to identify the materials beyond simply stainless steel or bronze. sir with the greatest of respect Can you read the opening post as its wording may show Ive been to the SKF bearing material section...

The valve stops twice per revolution of the camshaft. There will always be boundary lubrication during these stops regardless of the volume of oil supplied. This is where the wear occurs. Modern engines last longer due to better material selection, not more lubrication. Have you even identified...

Hi all update time I spent some time looking at the lubrication system on the old girl. Threw, it at a CFD ( OpenFOAM ) software and as I originally thought the guides simply are not getting enough ( read any) oil. also the guide is boundary then mixed ,,just touches full film .."in...

Just double the amount. If that doesn't work, double it again. When a cloud of blue smoke trails you then you will have added almost enough. I'd just add a hamster water bottle filled with oil so it taps the ball bearing at the end of the feed tube at mid push. Hahahahaa its almost to that...

Hi Xr250 ( Cr250r are better though :) ) As was noted in that thread; Replacing is much better than knurling because a knurled surface wears 70% faster because of the missing surface area. Knurling is a stopgap repair at best; kinda like putting new rings against an old worn cylinder wall...

Brian you might want to reword this " The oil supply is not an issue as long as it is not zero." Stephen

[highlight #3465A4]Quote;" As we can view there is no 100% answer.[/highlight] ( there is , its just its not readily available ,,the texts given earlier were good and provided the answers ,,but 100 dollars yikes ,,, [highlight #3465A4]It appears it's Avery simple design.[/highlight]...

TugboatEng (Marine/Ocean) 6 Sep 24 04:53 If you can straighten your twist drill without breaking it, then it was not properly heat treated. I have seen this happen. ( teenager, electric drill , fathers drill bit and making a back rest for chopper , yes them were the days,,, there was...

Hi there Quote"If it was simple then engine designers would not have test stands for durability testing." Its not difficult ( to get a good estimate) its just we cant access the required " reading" https://www.youtube.com/watch?v=72qsY0g6B8I and chapter 3 of this book as suggested...

Thank you One thing ive discovered fro this question is BUY / SAVE books the information ( I think ) is disappearing Im actually a little "shocked" at what I thought would be a simple question ,,, Buy old books and keep them ! Thats my xmas and birthdays done for the foreseeable...

Hi there Quote "I don't have any directly useful contribution for you, but I am curious. If you do find the magic number, what will you do with it? What will you change in the engine to achieve the magic number? I need a idea of flow required, as I will quite literally give the guide what...

Please excuse the reply Im not sure how to "quote peoples reply so Im cut and paste " The seals are there to prevent oil pouring down the open gap; they are designed to leak a very small amount of the oil that is splashed about. " Reply; I gave the amount in the original post " 0.007 to...

Hi mfgenggear yes I am aware of all that, Its a number, textbook, or formula I'm after, I mean a sliding bearing ( guide bearing) is just a rotating bearing with a "very big circumference " I mean Mid stroke there should be enough "oil! to cover all the sticky up bits with a...

Thank you all for your input, Sorry but Valve guides go from boundary to mixed film to at best full film mid-stroke So they need a Q ( quantity ) of oil. 2; This is the problem Ive got, Even with "modern materials the valve guides are not getting enough oil so basically are running ( one...

Hi there Thanks for the reply Your ASSumption was correct. I thought it was obvious, but you know what thought , thought. The bike is a Royal Enfield Bullet and I'm afraid I am one of those " specialists" Hence the original question How much flow? I have the "bronze bearing Design...

Hi there Has anyone else noticed the decline of the "internet"? Cant seem to find any information on it these days I have an older engine Single cylinder British bike. I have a high rate of valve guide wear. Due to inadequate oil supply ( 25cc at 3000 rpm ON a good day ) so I needed to...