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| 440 ROTAX Type 454 Engine Tweaks http://www.pilotodyssey.com/PO/viewtopic.php?f=72&t=1227 |
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| Author: | hoser [ Thu Apr 07, 2005 12:15 am ] | ||
| Post subject: | 440 ROTAX Type 454 Engine Tweaks | ||
My Engine choice for my Pilot was a Engine that is 25+ years old, they are pretty easy to find if your not in a hurry so I picked up a few spares on Ebay, both need new crank seals so I figure now is a good time to replace the seals and clean up the casting flaws on the cases and cylinders.
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| Author: | hoser [ Thu Apr 07, 2005 12:18 am ] | ||
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The cases are pretty rough in stock form, casting flash every where, I set the cylinders on the cases then scribe the areas on the cases where they need matched, you can see in the picture the miss match is huge, I wish I had a 340cc cylinder it is almost like this case was cast for 340 cylinders not 440, or both, you can put 440 cylinders on a 340 bottom end or 340 on a 440 bottom end...
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| Author: | hoser [ Thu Apr 07, 2005 12:33 am ] | ||
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Here is a after pic
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| Author: | hoser [ Thu Apr 07, 2005 12:34 am ] | ||
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Bottom side
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| Author: | hoser [ Thu Apr 07, 2005 12:37 am ] | ||
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The cylinders needs lots of work the castings have flaws all over them, I spent about 3 hrs just roughing this one in there is at least 2 more hrs left to rough in then who knows how many hrs doing the final tweaking to balance things out.
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| Author: | King Kx [ Thu Apr 07, 2005 8:55 pm ] |
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You should take one of your spare bottom ends and fill the bottom with a fill or a wedge. By reducing the volume in the bottom end it allows for much higher intake pressure which results in more power. I tried this on a 100cc two cycle go cart Engine and it made a huge improvment in throttle response. I used an aluminum wedge in that application. I am curious as to the results in a twin or triple cylinder application. Just a thought I've been toying with if Brooks ever has me put that 617 rotax in his pilot. |
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| Author: | hoser [ Sun Apr 10, 2005 1:35 pm ] |
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There is not alot of room for stuffing in these cases, the windage trays also aid in reducing the volume. More pics http://pilotodyssey.com/440mold.htm And http://pilotodyssey.com/440cylinder.htm |
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