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Discussion in 'Hacks' started by windmill, Jan 14, 2013.
Ive been following this over on Soviet steeds. Cant say enough well done.
Did about 150 km in the mountains on some very familiar roads with the 120 main jets, it gets better all the time.
Ambient conditions, low 30's, foggy, dead calm.
Tiger summit (1377 ft, 7% grade for aprox 4 miles), normally a 3rd gear 55 mph wfo climb. I was able to maintain 50-55 mph in 4th, and when I down shifted to 3rd, I could maintain 60 mph at 1/4 throttle, and if I gave it more throttle it would accelerate till the valves started floating at around 65 mph.
On the freeway it will maintain 70 mph with ease, it will even maintain 75 mph on the flat, and I was able to hit 80 mph. Prior to the new intake and exhaust, anything over 70 mph required a tail wind while going down hill from Snoqualmie summit. I don't consider the increase in top end to really change how hard I will push it on the freeway, but it will be a useful "reserve power" for passing and steep grades.
45-50 mph was my normal shift point for 4th, now I find that I can up shift at 40 mph yet still accelerate to 60 mph quicker. Once on some back roads, maintaining speeds over 50 mph is much easier. coming into towns I can now hold 4th as low as 30-35 mph and accelerate back up to 55 mph by simply rolling on the throttle rather than down shifting.
Mid range roll on acceleration in 2nd and 3rd is so much better, its almost like another bike.
As expected when using a heavy throttle hand, often wfo, in the mountains, freeway, and back roads, mileage was fairly poor being around 25 mpg, but was still probably better than normal for such activities. Previous tank with 122 jets yielded almost 35 mpg in sub 50 mph commuting. An early guesstimate would indicate a 3 to 4 mile improvement in average mpg, making it about 33-34 mpg.
Pulled the filter to inspect it, after about 300 km it still looks it did when I put it in, and after wiping the inside of the filter housing with a white tissue, it came out clean. One thing I did notice, the breather hose is doing a nice job of lubricating the frame and skidplate, me thinks a "captivator" viewtopic.php?f=5&t=12108&hilit=breather will be my next project.
I am very happy with the results of this project, it has exceeded all expectations, especially since my goal was merely to increase service intervals in challenging conditions.
Windmill, Show it to IIya and tell him your results. This IMHO warrants at least consideration by the factory. Those increases are very significant! Congratulations!!!
Lets just say their preparations for the next round of emission standards will exceed the efforts of any shade tree fabricator on all levels.
What a great improvement. I wonder if Richard's pvc tube filter will get the same gains? It would be easier for me to copy.
Do you contribute the gains to better air flow and less restriction? It seems strange to me that you can reduce the main jet size so much.
Yes, I am willing to guess it could preform as well if combined with a similar flowing exhaust.
I'm no engineer, but to my understanding of the basic principles involved, flow is much more important than volume to a point. My aircleaner may actually flow less volume than the OE aircleaner, but the flow is significantly cleaner and more consistant.
The carbed Triumph twins are around 40cc larger, use the same carbs, produce more hp, and came stock with 42/110 jets.
Efficiency is very important, and the OE Ural aircleaner does very poorly in that department.
Having done 2 weeks of commuting and test riding I have a better feel for how the new aircleaner works.
There has definitely been a modest but noticeable improvement in performance and mileage, but as I suspected, a fair amount of the significant gains I initially observed can be attributed to the the ideal cold, dry conditions of the previous week.
After 2 weeks, and 400+km of both dry and and very wet winter riding conditions, I can say the precleaner is working fantastically, the paper filter element has stayed perfectly clean and dry which anybody familiar with the OE aircleaner will know is a very significant improvement.
I am very pleased with the real world results.
Very nice work. I had something very similar to that on my Pinzgauer and it REALLY separated the dust out before it got to the filter.
Again Great job.
And the MPG improvements are ?
After 3 tanks of gas, maybe 3 mpg?
Allow me to add my compliments to some amazing fab work!
I have been looking for the filter you used. Is this the same one that is used for the Trabant 601?. That one looks like it has an opening only at one end. Did you open the other end? Or did the one you used have and opening at either end?
Sorry to keep pestering you, but where did you get the neat little rubber "gaskets" the plug inot the ends or the air filter?
Its the only filter I have seen listed for a Trabant, and it is open at both ends. The gaskets came from a Euro spec Ural Wolf aircleaner, cutting some from closed cell foam would be just as good.
Almost 1000 km since I started running it, and have exposed it to the worst possible winter riding conditions, the filter still looks like new. The same km's and conditions would have required servicing the OE filter several times.
I hope I can do your efforts justice. I have a high bar to clear.