Calling out Titan performance!

[Suzukidave]

I should have said the valve is in the banjo part

[ConnerVT]

So the bolt is where the check valves are? Like a one way valve? Is it a spring loaded ball?.....

Yes. Yes. And Yes.

Is this so crank case pressure doesn't blow oil back to pump, and oil only flows when there is vacuum under the piston?

Basically. Except the valve really doesn't work on vacuum from the cylinders, but rather from the pressure from the oil pump.

More important, the concern is to prevent oil from flowing from the oil tank to the cylinders when the engine is *not* running. The oil tank is physically higher than the oil lines outputs. Without a check valve, oil would gravity feed, and pool in the cylinders.

[CJF]

I've stated that Seadoo 2t engines also use these style checkvalves, or something very similar. While I've not checked if they would fit, it certainly would be worth a check. Might be easy to self fab some line kits. Last I checked, those were still available from Bombardier.

I attempted to use the Polaris check valves for my T500 without success. I couldn't get the oil to run through the line. I couldn't figure out if the check valve cracking pressure was different than stock Suzuki or there was some other issue. I never ended up testing the cracking pressure, but i know there are ways to do this. I ended up finding a good used line. Here is the thread showing pics of the line I made up.

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[JFISHSOLEVIBE]

This is an excellent discussion! Always wondered myself about where that valve was. Unique design. Maybe you guys can answer a question Ive had for awhile....

My returns (SRIS recycle lines) from the bottom of the crank case were removed (dried and cracked off) during top end rebuild. The only solution I could come up with here was to use a slightly larger piece of tubing to act as a coupler between what remained of the original recycle lines from the crankcase, to the new lines which I added, which connect at the intake side of the cylinder. Will I run into a problem here?

By my logic, all this recycle system does is reuse residual crankcase oil to cut down on excess smoke... I dont mind the smoke. Would it be prudent to cap off both sides of the SRIS system? Has anyone done this? Again to be clear, my oil pump works fine, and the lines from the pump are intact with valves working. Its the recycle system lines that are "rigged" in a sense.

Bike is a GT380J by the way...

[yeadon_m]

The SRIS system was deleted entirely on later 380s; my B does not have it. Of my three GTs, the smoke is most even across the stack of exhausts on the 380, so for my part, I'd say cap it off. I would worry if you change the ID of the tubes, it might not pump as designed - I've no data, just a hunch.
Mike

[oldjapanesebikes]

3D printers would also be great for badges.
No more problems with the badge screw holes not lining up with the ones on the tanks & side covers -- would a problem easily fixed in software.

At the least a very accurate mold could be printed out .

The issue isn't the accuracy of the mould Dave - its that you have to have the correct shrinkage allowance added to the pattern as the pot metal has about a 3% shrinkage when it cools. I discussed this with the fellow who makes most of the ones sold globally (by Diablo, Badge Replica, GTReiner, etc) , and he told me he didn't sell enough to cover the cost of engineering proper patterns for every model/make he sells so he uses exact copies of the originals as a pattern, and so they are all too small as a result.

[Suzukidave]

That would make useing a 3d printer even better as i bet its easy to make a blank to make a mold just a bit bigger than needed to allow for shrink by just changing the printer program a bit ?

[jabcb]

... I discussed this with the fellow who makes most of the ones sold globally ...

The hurdle with 3D printing is getting a description of the badge into the computer.

Found some interesting info from a Google search of "3d laser scanning". Looks like the capability may now exist.
New tech tends to improve quickly & get cheaper quickly.
Affordable 3D scanning/printing might be available sooner than we expect.

An example of what I found: http://makeit3d.com/3d-laser-scanning/

Ian, might help if you give your contact a heads up.

[yeadon_m]

I have a little experience with 3D printing in that my company used to do rapid prototyping of medical device parts this way - a thing of wonder when I first saw it 5+ years ago (I did not know it was possible then).
But, I believe the materials which can be 'printed' are really rather limited - essentially, plastic polymers which can be prompted to 'go off' (set) using a precisely directed lazer (at least thats one method that uses polymerization). So I do believe oil pump line bases might well be done and quite well also.

But....can this ever be done with metals and if so, what principles would need to be used? we are all familiar with electroplating, a kind of 'printing', if you'll allow the comparison - but there the part is the former and the metal comes from solution. I can't envisage the metal chemistry and practicalities needed to 'print' 3D metal in the way we'd like.

I'm an enthusiastic sceptic - I love new stuff, but it rarely gets close to the *media hype.
Mike
*eg in my old field, please don't count on a cure for Alzheimers, growing new human organs, routine stem cell or gene therapy any time soon.

[jabcb]

Made the news recently when a small US company used a 3D printer to make plastic guns that actually work. They showed the gun being fired.
Some thermoplastic printers are now cheap enough for use by hobbyist. Printers cost $20k in 2010 & now are available for less than $1k.
Also, it looks like 3D scanning services now exist.

Perhaps the most interesting scenario was mentioned by Suzukidave:
1) 3D scan an original badge
2) use software to enlarge the part by 3%
3) 3D print an enlarged part
4) use the existing process to make a badge in pot metal
Then when it shrinks 3%, you have the correct size

Replacement side covers made out of ABS also looks interesting.
Would be easy to fix design flaws using software.
For example, GT250/T350 side covers have a weak spot due to the cutout for the fake metal air intake. Could easily make that area a little thicker.