I wonder if the 915 is still using a 2 stroke crank?
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| NEW ROTAX 915 http://skywolverines.com/viewtopic.php?f=2&t=3334 |
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| Author: | elwood [ Wed Dec 02, 2015 12:43 pm ] |
| Post subject: | NEW ROTAX 915 |
Rotax announces the new 135hp 915 turbo... http://www.brp.com/en-us/company/news/r ... aft-engine |
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| Author: | loftus [ Wed Dec 02, 2015 12:49 pm ] |
| Post subject: | Re: NEW ROTAX 915 |
Looks sweet; you know it's going to be pricey. |
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| Author: | elwood [ Wed Dec 02, 2015 2:54 pm ] |
| Post subject: | Re: NEW ROTAX 915 |
The 914 is around $30k so 18% more power should cost 18% more.....$35,400 would be my guess... unless rotax just rounds up to $40k to keep the numbers nice and even.... |
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| Author: | Gabor [ Wed Dec 02, 2015 3:02 pm ] |
| Post subject: | Re: NEW ROTAX 915 |
D-Motor LF39 135HP for 22grand. Fuck Rotax http://www.d-motor.eu/nl/update-29-nov-2015-147.htm |
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| Author: | elwood [ Wed Dec 02, 2015 3:17 pm ] |
| Post subject: | Re: NEW ROTAX 915 |
I like the D-motor very much, I really like it in the Niki lightning! |
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| Author: | Gabor [ Wed Dec 02, 2015 4:30 pm ] |
| Post subject: | Re: NEW ROTAX 915 |
They have been running the 4 cylinder ones in helicopters (major major test!!!) and they are performing flawless. 35 moving parts! 4 grand overhaul 2000 hours TBO. And they make them the very airport we hangar at!!!! |
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| Author: | MadMuz [ Wed Dec 02, 2015 4:39 pm ] |
| Post subject: | Re: NEW ROTAX 915 |
I wonder if the 915 is still using a 2 stroke crank?
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| Author: | elwood [ Wed Dec 02, 2015 4:40 pm ] |
| Post subject: | Re: NEW ROTAX 915 |
The Flathead design is great for a low RPM engine, it eliminates lots of complication and weight too.And makes a smaller package. I love it. |
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| Author: | elwood [ Wed Dec 02, 2015 4:43 pm ] |
| Post subject: | Re: NEW ROTAX 915 |
Back in the old days you could buy surplus military drone engines...ala, the Mac... but now some of the military drones use rotax 914's, but they are destroyed and not surplussed.. too bad 4 us.. |
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| Author: | elwood [ Wed Dec 02, 2015 4:45 pm ] |
| Post subject: | Re: NEW ROTAX 915 |
MadMuz wrote: I wonder if the 915 is still using a 2 stroke crank? I don't see why they would change, especially since they are dry sump, the roller bearings can live with less oil, but rotax never built anything to be cheap and/or easy to maintain. Harleys still use roller crank bearings. |
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| Author: | Gabor [ Wed Dec 02, 2015 4:51 pm ] |
| Post subject: | Re: NEW ROTAX 915 |
Plus valves sticking event is a none event. Overhead valve will cost a lotta dough!!!! |
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| Author: | MadMuz [ Wed Dec 02, 2015 4:53 pm ] |
| Post subject: | Re: NEW ROTAX 915 |
elwood wrote: MadMuz wrote: I wonder if the 915 is still using a 2 stroke crank? I don't see why they would change, especially since they are dry sump, the roller bearings can live with less oil, but rotax never built anything to be cheap and/or easy to maintain. Harleys still use roller crank bearings. The reason I would like to see them change is because to change the bearings you have to press apart the crank.... and that cranks can 'wander' a bit and get out of line. As you know, some folks weld their cranks... but this means you can never rebearing that crank again.... Harleys only have one pin, so new bearings can be fitted  Have I told you lately that   
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| Author: | Gabor [ Wed Dec 02, 2015 4:56 pm ] |
| Post subject: | Re: NEW ROTAX 915 |
I missed the
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| Author: | elwood [ Wed Dec 02, 2015 4:59 pm ] |
| Post subject: | Re: NEW ROTAX 915 |
Ok well here! |
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| Author: | MadMuz [ Wed Dec 02, 2015 5:05 pm ] |
| Post subject: | Re: NEW ROTAX 915 |
Speaking of douchbags.... where is Jon these days? And, if you are there Jon....
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| Author: | Gabor [ Wed Dec 02, 2015 5:30 pm ] |
| Post subject: | Re: NEW ROTAX 915 |
Besides on the D-motor there is no turbo charger!!!!! 135hp normally aspirated. I am not big fan of turbo chargers on aviation engines...... 
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| Author: | elwood [ Wed Dec 02, 2015 7:32 pm ] |
| Post subject: | Re: NEW ROTAX 915 |
The D motor is bad ass, probably sounds like an old ford hot rod. |
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| Author: | dinoa [ Thu Dec 03, 2015 10:00 am ] |
| Post subject: | Re: NEW ROTAX 915 |
If a pressed crank goes out of whack, it can be trued again. It's often the final step when pressing them back together. Final adjustment is made with a lead hammer. |
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| Author: | MadMuz [ Thu Dec 03, 2015 10:53 am ] |
| Post subject: | Re: NEW ROTAX 915 |
That is true Dinoa, but my point is, that if the crank moves and you don't know it, it flogs everything else inside the engine out. That is why the 9 series had so much starting issues and when they weren't starting properly and were running backwards, it would twist the crank.... even a backfire on cranking.... or running backwards on shut down may twist the crank (or damage the gearbox).... so to me, if you are paying the same amount of money for a bare motor for a hobby/sport like a gyro motor at $30K when you could buy a new car for that.... the motors need to be at least a little more resilient than a pressed crank from a 2 stroke. Even if the crank pins were splined and press fitted.... or press fitted with a keyway to keep them straight would be a help.... but I have seen a 582 crank getting pressed straight.... pretty stone age really I just think that the amount of cash the motors cost... you should be at least a little confident it will reach TBO without worrying if it backfires while starting or runs backwards etc Just my opinion  So nobody become an  and y'all (especially that dang Lofty)
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| Author: | RayNAiken [ Thu Dec 03, 2015 1:25 pm ] |
| Post subject: | Re: NEW ROTAX 915 |
I sure would like to see the rudder control mechanism diagram of this. Attachment: niki.jpg |
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