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Author Topic: Nanno's "mule" a TR1 for everyday  (Read 5065 times)

Offline der_nanno

  • Posts: 488
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    • Greasy Greg
Re: Nanno's "mule" a TR1 for everyday
« Reply #40 on: Jan 29, 2019, 02:18:15 »
This thread is actually missing some of the updates that haven't happened all too lately actually.

After inspecting my old engine, I discovered that the distance between piston and squishband simply was too big to make the squish work effectively. (Quite the opposite really!) So after a lot of thinking (and admittedly hesitation to pull the engine apart again), I decided to take some measurements and win 0.5mm by replacing the base-gasket with some liquid gasket. So far everything seems to clear and now the piston to squish clearance is set at 1.20-1.25 (inaccuracies of my vernier caliper), which is still about 0.15 to 0.20mm more than I wanted but a whole world better than the 1.75 to 1.80mm that I originally had. (There will be a longer explanation on the blog coming weekend, when I have a bit more time to spell it all out for those, who are interested.)
« Last Edit: Jan 31, 2019, 10:33:32 by der_nanno »
Real freedom starts with the freedom of thought.

My Blog:
http://greasygreg.blogspot.co.at

My Mule TR1.1 build here on DTT:
http://www.dotheton.com/forum/index.php?topic=75458.0

My Turbo TR1.1 (XV1000) build here on DTT:
http://www.dotheton.com/forum/index.php?topic=72571

My XS Triple Sidecar build here on DTT:
http://www.dotheton.com/forum/index.php?topic=74211

Offline jordandogtown

  • Posts: 173
  • Washed up Weekend Warrior
Re: Nanno's "mule" a TR1 for everyday
« Reply #41 on: Jan 30, 2019, 17:12:03 »
Really nice write up on all the engine work.
"A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils, and lunatics" George Fitch, 1916

1979 CB750F Tracker (maybe?)

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Offline der_nanno

  • Posts: 488
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    • Greasy Greg
Re: Nanno's "mule" a TR1 for everyday
« Reply #42 on: Jan 31, 2019, 10:33:43 »
 :)
Real freedom starts with the freedom of thought.

My Blog:
http://greasygreg.blogspot.co.at

My Mule TR1.1 build here on DTT:
http://www.dotheton.com/forum/index.php?topic=75458.0

My Turbo TR1.1 (XV1000) build here on DTT:
http://www.dotheton.com/forum/index.php?topic=72571

My XS Triple Sidecar build here on DTT:
http://www.dotheton.com/forum/index.php?topic=74211

Offline der_nanno

  • Posts: 488
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    • Greasy Greg
Re: Nanno's "mule" a TR1 for everyday
« Reply #43 on: Feb 03, 2019, 16:57:14 »
To be fair, I've never been really getting to terms with the concept of "good enough" and one of the thoughts that has been nagging me at the back of my head was me wondering: could the detonation in the old engine have been successfully countered by tightening up the squish. Even though before hand it has to be said, that the new engine came with a somewhat tighter squish of 1.71mm (measured on the rear piston) than the old engine, which was closer to 2.00mm. In order to measure my squish-gap, I used some very soft solder with 2mm diameter.



Once that was done, I whipped off the head and inspected both piston and head and could find no abnormities. Except for a bit more carbon buildup than I am fully happy with, but no signs of detonation or the like. The circular squishband of the 700 seems to work just fine, so I don't think that (for now) any adjustments to that are necessary.





In order to lower the cylinder (and thereby get the piston and head closer together) I left out the base gasket and replaced it with some liquid sealant.



A bit of it squished out again on the sides, but once dry, it can quite easily be peeled off and it should be nicely oiltight.



And the gain: 1.25mm of squish-gap between piston and head. I would have loved to get it even closer for more efficiency, but then that could have come round to bite once the tolerances in the engine start to add up.



Modern literature states that a squishband becomes dramatically inefficient, once the gap exceeds 1.70mm, so to say I have some great expectations for this engine is a mild understatement. Regardless of what I wrote further up, this will be the last mod to this engine, unless it turns out not to be working as desired as I still have a turbo-bike to address and a second (currently broken) engine with a spare frame that I want to use for testing stuff like my welded up heads etc.

Blog-Post: https://greasygreg.blogspot.com/2019/02/the-new-tr1-engine-squishing-things.html
Real freedom starts with the freedom of thought.

My Blog:
http://greasygreg.blogspot.co.at

My Mule TR1.1 build here on DTT:
http://www.dotheton.com/forum/index.php?topic=75458.0

My Turbo TR1.1 (XV1000) build here on DTT:
http://www.dotheton.com/forum/index.php?topic=72571

My XS Triple Sidecar build here on DTT:
http://www.dotheton.com/forum/index.php?topic=74211

Offline der_nanno

  • Posts: 488
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    • Greasy Greg
Re: Nanno's "mule" a TR1 for everyday
« Reply #44 on: Mar 13, 2019, 03:37:42 »
There's some news to come... I hope to be able to finish this exhaust today:



Real freedom starts with the freedom of thought.

My Blog:
http://greasygreg.blogspot.co.at

My Mule TR1.1 build here on DTT:
http://www.dotheton.com/forum/index.php?topic=75458.0

My Turbo TR1.1 (XV1000) build here on DTT:
http://www.dotheton.com/forum/index.php?topic=72571

My XS Triple Sidecar build here on DTT:
http://www.dotheton.com/forum/index.php?topic=74211

Offline der_nanno

  • Posts: 488
  • Faster!
    • Greasy Greg
Re: Nanno's "mule" a TR1 for everyday
« Reply #45 on: Mar 14, 2019, 13:34:48 »
Completed. (except for some cosmetical work)



Real freedom starts with the freedom of thought.

My Blog:
http://greasygreg.blogspot.co.at

My Mule TR1.1 build here on DTT:
http://www.dotheton.com/forum/index.php?topic=75458.0

My Turbo TR1.1 (XV1000) build here on DTT:
http://www.dotheton.com/forum/index.php?topic=72571

My XS Triple Sidecar build here on DTT:
http://www.dotheton.com/forum/index.php?topic=74211

Offline Brodie

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  • Posts: 2506
  • Gold Coast, Queensland
Re: Nanno's "mule" a TR1 for everyday
« Reply #46 on: Mar 15, 2019, 00:59:40 »
Very interesting design. It it a 2-1-2 design?
I'm not sure, but don't ask Brodie.

Way to many build and half done projects to list here.
Sr250, Gs750, Z50A, XV1100, A10, Z160A.

Offline der_nanno

  • Posts: 488
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    • Greasy Greg
Re: Nanno's "mule" a TR1 for everyday
« Reply #47 on: Mar 15, 2019, 03:13:26 »
Yep, equal length 2-1-2, "just" like the old setup, but with a different rear downpipe (now the correct length exactly) and a different collector.

The whole setup is built so I can swap in different collectors as well to play around with those for performance reasons. (I actually want the collector to be a bigger diameter than the tubing for more top-end performance, i.e. from 1 3/4" (45mm) downtubes to a 2" (50mm) collector. I may end up building that collector from pie-cuts though, which is why I stayed away from that and did a 1 3/4" collector for a start.
Real freedom starts with the freedom of thought.

My Blog:
http://greasygreg.blogspot.co.at

My Mule TR1.1 build here on DTT:
http://www.dotheton.com/forum/index.php?topic=75458.0

My Turbo TR1.1 (XV1000) build here on DTT:
http://www.dotheton.com/forum/index.php?topic=72571

My XS Triple Sidecar build here on DTT:
http://www.dotheton.com/forum/index.php?topic=74211

Offline brad black

  • Posts: 171
Re: Nanno's "mule" a TR1 for everyday
« Reply #48 on: Mar 15, 2019, 23:28:34 »
with that sort of reduction in squish clearance it should be a lot less likely to detonate.  you could have machined the base of the cylinder to go a bit further.

but it will impact the cam timing a fair bit.  the cams will roll back as the tensioners will come out more so you'd get a few degrees retard with that sort of drop.  which will also make it less likely to detonate as it'll lose midrange cylinder pressure.  might be worth working out how to reset them.

Offline der_nanno

  • Posts: 488
  • Faster!
    • Greasy Greg
Re: Nanno's "mule" a TR1 for everyday
« Reply #49 on: Mar 16, 2019, 19:05:55 »
Right, the attempt to build Mk.8 with a bigger collector failed, because my exhaust tubing vendor couldn't deliver 50mm (2") tubing with the correct radii. This made my original goals for building a new exhaust shrink down a bit to: 1) mustn't touch anything (especially not the chain-gaitors) 2) all the sleeves should point in the right direction to prevent sealing issues 3) provide room for an O2-bung (even though I do not plan to use one in the near future).



Among the design criteria was to plan for the necessary room to install LONG sleeves to have everything seal up properly and of course two downpipes of equal length.



The afforementioned O2-bung, right after the first Y-collector



And what it looks like right now (almost) done:


More pictures and more background infor on the Blog: https://greasygreg.blogspot.com/2019/03/the-next-version-of-mk7-exhaust.html
Real freedom starts with the freedom of thought.

My Blog:
http://greasygreg.blogspot.co.at

My Mule TR1.1 build here on DTT:
http://www.dotheton.com/forum/index.php?topic=75458.0

My Turbo TR1.1 (XV1000) build here on DTT:
http://www.dotheton.com/forum/index.php?topic=72571

My XS Triple Sidecar build here on DTT:
http://www.dotheton.com/forum/index.php?topic=74211