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gme9261236
Joined: 27 Jan 2007
Posts: 109
Location: Hampton, NH 7B3
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| Posted: Sun Jan 20, 2008 9:59 am Post subject: Engine Mount |
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| Installing the engine mount to the firewall today and noticed that it sits probably a 1/4" to a 1/2" to the right as you look on center. It appears as if it is possibly angled to the right because when we measure from the firewall to the base where the engine sits it is 8 1/2" on one side and 8 3/4" on the other. Does JA do this on purpose probably to counteract something or does the engine compensate for this when mounted? Have any of you also come across this problem? |
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Gerald V9
Joined: 13 Dec 2006
Posts: 17
Location: Rapid City, South Dakota
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| Posted: Sun Jan 20, 2008 10:39 am Post subject: Engine mount |
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GME,
Yes the engine mounts are designed with a slight angle so that the thrust vector offsets some of the P-factor that the propeller creates. (The increased thrust generated by the prop blade going downward in its rotation versus the left upward moving blade) In trial fitting my engine mount yesterday, it seems to be about the same as yours.
Good Luck, Gerald V9 |
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gme9261236
Joined: 27 Jan 2007
Posts: 109
Location: Hampton, NH 7B3
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| Posted: Sun Jan 20, 2008 10:45 am Post subject: |
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Gerald,
Thanks alot for that information. I figured that it was not a design flaw but better to verify now then after I mount it, bolt the engine on and finish the firewall forward.
Have you or anyone else used any specific tourqe settings on the 4 bolts that secure the mount to the firewall or have you used the T.L.A.R method (that looks about right) |
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Gerald V9
Joined: 13 Dec 2006
Posts: 17
Location: Rapid City, South Dakota
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| Posted: Tue Jan 22, 2008 11:34 pm Post subject: |
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GME,
The T.L.A.R. method certainly will work. The max torques for the AN Bolts is really not as high as one might think. AN3 = 25 inch-pounds AN4 = about 66 inch - pounds AN5 = about 138 inch - pounds Which puts the four engine mount bolts at about 66 inch - pounds or just reef-on-em.
Later, Gerald |
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gme9261236
Joined: 27 Jan 2007
Posts: 109
Location: Hampton, NH 7B3
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| Posted: Tue Jan 22, 2008 11:57 pm Post subject: |
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Thats great info again Gerald
I have found that the T.L.A.R method has been the way to go as far as the highlander build. Amazing that I would have to resort to that with the absolute in depth and thorough build manual that was supplied. |
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