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The "mule" Nanno's new naturally aspirated motor

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Re: The "mule" Nanno's new naturally aspirated motor

PostAuthor: nanno » Wed Mar 13, 2019 1:23 am

There's some news to come... I hope to be able to finish this exhaust today:

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http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

http://greasygreg.blogspot.co.at (My blog - Greasygreg.blogspot.co.at)
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Re: The "mule" Nanno's new naturally aspirated motor

PostAuthor: nanno » Thu Mar 14, 2019 1:36 am

Done. Some minor cosmetical work is still due, but functionally it's all there and it fits like it should.

Image

Image
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

http://greasygreg.blogspot.co.at (My blog - Greasygreg.blogspot.co.at)
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1979 RD250/R5/DS7-hodgepodge (in bits)
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Re: The "mule" Nanno's new naturally aspirated motor

PostAuthor: Hellgate » Thu Mar 14, 2019 1:39 am

Looks great! When do you think as test ride will happen?
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Re: The "mule" Nanno's new naturally aspirated motor

PostAuthor: nanno » Thu Mar 14, 2019 3:39 am

If the weather clears up: this weekend. Currently we're on the edge between rain and snow (again).

If not, I will have some time to install softer valve springs and do some other mods. Either way, the weekend will not be lost. :cl:
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

http://greasygreg.blogspot.co.at (My blog - Greasygreg.blogspot.co.at)
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Bike year & model: 1981 Yamaha TR1
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1977 XS 750 Sidecar
1984 XT500 4Valve (Austrian Tax saving edition)
1979 RD250/R5/DS7-hodgepodge (in bits)
Sex: Male

Re: The "mule" Nanno's new naturally aspirated motor

PostAuthor: nanno » Sat Mar 16, 2019 5:05 pm

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).

Image

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.

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

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

Image
More pictures and more background infor on the Blog: https://greasygreg.blogspot.com/2019/03/the-next-version-of-mk7-exhaust.html
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

http://greasygreg.blogspot.co.at (My blog - Greasygreg.blogspot.co.at)
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1979 RD250/R5/DS7-hodgepodge (in bits)
Sex: Male

Re: The "mule" Nanno's new naturally aspirated motor

PostAuthor: Hellgate » Sat Mar 16, 2019 6:07 pm

Gregg, once that thing is dialed in I'll buy a set.

That is amazing!Image
Pete
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'88 RD350 YPVS
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Re: The "mule" Nanno's new naturally aspirated motor

PostAuthor: nanno » Sun Mar 17, 2019 2:27 am

Thx for the kind words!

Btw.: The prototype to this exhaust is available via the for-sale section, as quite frankly, due to job-obligations, I don't think I will be building any exhaust for other people. Still have to do a proper solution for the sidecar and I suspect my dad will play his "daddy-" card and gently twist my arm to build a replacement exhaust for his poor man's Guzzi (CX500) and when I am done with that (considering my current pace) it will most likely be October or November...

Really curious to see how it will perform. I have to "adjust" the centerstand though to make everything fit.

Quite a few maintenance posts coming next. :;:
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

http://greasygreg.blogspot.co.at (My blog - Greasygreg.blogspot.co.at)
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nanno
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Bike year & model: 1981 Yamaha TR1
1982 Yamaha TR1 Turbo
1977 XS 750 Sidecar
1984 XT500 4Valve (Austrian Tax saving edition)
1979 RD250/R5/DS7-hodgepodge (in bits)
Sex: Male

Re: The "mule" Nanno's new naturally aspirated motor

PostAuthor: nanno » Sun Mar 17, 2019 5:57 am

http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

http://greasygreg.blogspot.co.at (My blog - Greasygreg.blogspot.co.at)
User avatar
nanno
Silver Membership
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Posts: 1193
Joined: Thu May 26, 2011 4:06 pm
  Flag
Bike year & model: 1981 Yamaha TR1
1982 Yamaha TR1 Turbo
1977 XS 750 Sidecar
1984 XT500 4Valve (Austrian Tax saving edition)
1979 RD250/R5/DS7-hodgepodge (in bits)
Sex: Male

Re: The "mule" Nanno's new naturally aspirated motor

PostAuthor: Hellgate » Tue Mar 19, 2019 5:38 pm

Sounds great!
Pete
'12 Tuono V4R APRC
'05 R6 Track Bike
'88 RD350 YPVS
'82 XV920RJ
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Re: The "mule" Nanno's new naturally aspirated motor

PostAuthor: nanno » Tue Mar 26, 2019 1:37 am

Now that's (sort of) a first: working against performance and towards everyday reliability and longevity.

Step 1: As suggested by Sepp Koch, I have started playing around with softer valve springs to give the valve train a chance to live a bit longer as the seatpressure of the stock valve springs, especially in a 700 or 750 is through the roof. I only shaved off about 10kg (100Nm) of seat pressure, but every bit helps.

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As you may or may not remember, I replaced the base gasket, with liquid gasket in an attempt to get the piston closer to the squishband in the cylinder head. This works perfectly, but it has the downside, that every time you loosen the head, you have to re-seal the cylinder foot as the cylinder pulls up on the unsupported side, which is a bit annoying. Luckily the liquid gasket I chose can be cleaned off quite easily with some brake cleaner and a brush, so it was maybe an extra ten minutes per cylinder to get everything squeaky clean again. (Making sure no oil leaks onto the mating surfaces or not dipping your finger into the gasket goo is much more of a challenge!)

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There is a slight shift in timing, even with a brand new timing chain, so ultimately (once the chain stretches a bit), I'll probably have to make an adjustable cam sprocket, but until then, we'll just earmark this as a mod to shift timing towards more torque. :cl:

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Last but not least: a softer timing curve with less advance. I had some detonation issues on the old engine, so tuning everything towards running a bit softer should be a good thing, especially with the tightened up squish, I hope to have finally found a way to keep detonation in check. Oh and that curve from 8000 to 9000rpm going to zero, that's my little life-saver as the rev-limiter on Ignitechs works fine until you overshoot it, e.g. by missing a gear. (At least in older versions it did and I am too much of a chicken to find out, if it's good now.)

Image

Bit more on the blog (as usual): https://greasygreg.blogspot.com/2019/03/the-new-tr1-engine-softer-valve-springs.html
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

http://greasygreg.blogspot.co.at (My blog - Greasygreg.blogspot.co.at)
User avatar
nanno
Silver Membership
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Posts: 1193
Joined: Thu May 26, 2011 4:06 pm
  Flag
Bike year & model: 1981 Yamaha TR1
1982 Yamaha TR1 Turbo
1977 XS 750 Sidecar
1984 XT500 4Valve (Austrian Tax saving edition)
1979 RD250/R5/DS7-hodgepodge (in bits)
Sex: Male


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