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I did a bit of research before I decided on Delrin.
Although Teflon is 'slipperier' and has higher temperature rating its softer than Delrin so wears faster.
I've seen CB350 teflon slipper tensioners worn out after a season racing.
I think it may 'creep' at operating temperature without some sort of backing material?
Still looking into making something
I found that opening up feed holes in crankcase (under bottom of cylinder) helps significantly.
I'm working on two different modifications to hopefully prevent it happening on my motors.
that's exactly what I did on my most recent motor. I had a spare case that I modified accordingly. Admittedly though I am nervous using the stock slippers in there still after all of that work. I understand the oil pumps in the 360 leave something to be desired, but I also know for a fact that there was debris in the passages. That's good info man
if like to see a head modified with bearings. I just don't have the equipment to mill out a spare on my motor. To me swapping the valve rockers would be a much easier fix than having to disassemble the entire head. So much potential for those of us with enough broken modifyable "broken" parts and enough gumption to modify them accordingly! I envy you guys that have more machining skills and better equipment than I do. I'd settle for a nice Bridgeport!
It's white smoke and smells like...well burnt oil. The oil passages were completely blocked off upon inspection. In my experience, these 36o engines break slippers...slippers leave fragments...fragments get lodged....you get the idea. Your head is starving for oil when this happens and eventually it will seize.
Moving along at a snails pace, but things are happening. These are a couple of schemes that I'm looking at right now. I like the bottom one, but I have no idea If that seat's nearly big enough... looks cool though. Modeling with Surfcam is a nightmare.
This is some bodywork I made for my 750 chopped a little in the front
Yeah it's pretty unreasonable, I love the little frame reveal detail though:
I had been fighting with trying to make the seats wide enough to cover the frame without making them look really fat, and on that one I just gave up which presented a cool opportunity to reveal the frame where I could mount a couple of little round tail lights or something. I had a single round 1" LED light on my Monster:
and loved that setup, one on each side would be even better.
Delrin is a great material but I suspect it will get soft. That design is very thin and easy to distort. Oil temps are usually below 200f and I have no idea how hot that rubbing surface will get. At say 175-200 a solid delrin tensioner is potentially going to lose its ability to tension the chain adequately.
Only one way to find out though, and that's to test it.
I'd ask the question - what are modern slipper tensioners made of? CBR600 had a nylon front guide and rubber faced steel backed rear last time I looked, but newer may have changed to something else.
10 out of 10 for drive and determination on that fairing. That's how Craig Vetter got started. read his book on the BSA Hurricane for more details of his labors on body shapes. I think he used plaster over chicken wire but I could be wrong.
Modifiying another fairing is not a whole lot easier. I have modified tanks and seats and fairings and I think it's often easier to make a plug and go from there, but neither is quick or simple.
Because I'm stalking you and want to be just like you...
6 and 9 are the last two digits in the VIN number, when I noticed that I decided that would be its' name, and if it had a number for a name I had to make it a racer... the rest is history, or mostly future really, at this point.
I have to do the fairing this way because if I did it all by hand making the headlight and air ducts and all that stuff fit would be a nightmare. With all of it in the computer I can machine one part out of foam and another out of aluminum 6 months apart and know that they'll fit together... or at least stand a better chance of fitting all together.
im an industrial designer; been following some of your builds off and on the past couple years. your builds are pretty amazing and it been cool seeing those model making skills.
so it seems you're hard at work with the modeling and not getting what you need. need some help? i am well versed in surfacing Cad programs and can export out into iges, stl, whatever you need.
I made a delrin primary chain tensioner to replace the plastic piece on one of my xs850s and put probably 15000 on it before I parked the bike for (eventual) rebuild. It lives in a hot oil environment and never gave a lick of trouble. As well, the timing chain tensioner on my Dodge 4x4 was delrin and that one got ABUSED.
You should be fine, though you may want to think about backing it with metal because it is a softer polymer.
This is 20 LB sign foam (it comes in a range of weights), it's the perfect thing to make seats and anything else out of... and it's not unobtainable. You know when you go to a mall and all the signs in the food court are 3D, most of it's made out of this stuff. There are companies all over the country that use it and most that use a lot of of throw a lot of it away. I worked for a company in college called Signtech in Seattle and when we were making displays for Disneyland we tossed scraps that were big enough to make my fairing out of. Find these places and scour their dumpsters.
Rough out of the top cap (the seat's just over 7 inches tall, but I was working with 4 inch material)
First side of the base done, both sides of the cap done
...and here she is. It's based on the bottom rendering, but extended a bit
I can't wait to get home tonight to see if it actually fits the frame, I'll see how good my model is.
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Melting Point - °F 347
