04-19-2016, 01:11 AM | #1 |
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Float a motors
The FAM's were on my car when purchased and the rubber biscuits are being replaced with new ones. The frame/ plate rubbers are OK as installed. How snug should the bolts be that go down thru the biscuits?
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04-19-2016, 01:26 AM | #2 |
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Re: Float a motors
Tighten the nylon nuts just enough to secure them and slightly compress the "biscuits". Too much and you eliminate the vibration reduction.
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04-19-2016, 09:53 AM | #3 |
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Re: Float a motors
WOW, I was going to post this exact question this morning.
I replaced the doughnuts at the bellhousing, and the rubber at the rear cross-member. Mine just had regular nuts/bolts and was planning to pick up some "ny-lock" nuts today so I can adjust the tension. The old rubbers are hard as a rock and the ones on the bottoms were compressed quite a bit. I'm hoping for some vibration reduction happiness. |
04-19-2016, 11:26 AM | #4 |
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Re: Float a motors
I assume there should be no bulge in the biscuits. It would appear that perhaps tightening just enough so that the top "metal" retainer plate under the bolt head should just not move. Does that make sense ?
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04-19-2016, 12:37 PM | #5 |
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Re: Float a motors
I'm going to start loose and slowly tighten until I find a happy spot. My front mount (by crank pulley) is really sensitive to how tight it is. A quarter turn can make a big difference in vibration. I put a ny-lock on it to so I wasn't restricted in adjustment by needing a cotter pin.
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04-19-2016, 12:41 PM | #6 |
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Re: Float a motors
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Bill W.
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04-19-2016, 06:39 PM | #7 |
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Re: Float a motors
Had my coupe out for a test run, did just like Bill said. It has helped alot!
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04-19-2016, 07:37 PM | #8 |
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Re: Float a motors
Clutch is jumpier tho...
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04-19-2016, 08:22 PM | #9 |
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Re: Float a motors
When I installed my first set of FAMs, the rubber block that goes on the cross member looked too small - and it was. It soon fell out and from then on, till I made a new rubber block, the clutch shuddered something awful in reverse. As soon as I cast a new rubber, the problem went away.
Maybe you should look at that rubber block.
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04-19-2016, 09:45 PM | #10 | |
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Re: Float a motors
Quote:
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04-19-2016, 11:09 PM | #11 | |
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Re: Float a motors
Quote:
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04-19-2016, 11:53 PM | #12 |
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Re: Float a motors
I doubt that's big enough, the one that came out is about 3/4 inch square and 4-5 inches in length.
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04-20-2016, 12:47 AM | #13 | |
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Re: Float a motors
Quote:
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04-20-2016, 08:44 AM | #14 |
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Re: Float a motors
When the installation of the floating motor mounts is done, you need to have a 3.5 degree angle of the engine, downward to the rear. The purpose of the angle is to preserve the float setting assuming that it was set properly in first place.
You can see this angle as it is built-in the carburetor's attachment flange of the intake manifold. Otherwise you need to iterate a new float setting if you are running an original Zenith carburetor.
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04-20-2016, 09:40 AM | #15 |
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Re: Float a motors
Does FAM effect the alignment of the crank hole? Mine does not fit.
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04-20-2016, 10:13 AM | #16 |
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Re: Float a motors
While we're on the subject of FAMs, should the frame mounted part of the rear FAMs have the rubber pads between it and the frame, like the originals had?
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04-20-2016, 01:41 PM | #17 | |
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Re: Float a motors
Quote:
Not at all, it properly installed. Example: B engine in my '30 A frame. I used the rear alum FAM and the 'original' A front mount (along with the trans fam mount). Crank hols lined up perfect ! IMO, anyone not knowing better, tighten down these mounts...way TOOO much that I've seen , and/or do not install these mounts properly. Improper installation will cause problems with undue vibrations , wear and crank hole misalignment, etc.... BTW..just recently (after dozen yrs running as described above), I installed one of those B front mounts that are sold by vendors. After fitting problems(from maker) were corrected, my B is held much more stable under hard acceleration This B was fully balanced when built, however I was installing a crank nose balancer and opted for the B front mount. I've never had a 'vibration' from imbalance problem...but like to run rpms up a bit..sooo. Last edited by hardtimes; 04-20-2016 at 01:42 PM. Reason: ........ |
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04-20-2016, 03:36 PM | #18 |
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Re: Float a motors
I am putting in a new motor later this year. Should the rubbers be replaced whenever the motor comes out?
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04-20-2016, 04:12 PM | #19 | |
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Re: Float a motors
Quote:
You will probably find a ton of other parts you want to replace "while it's apart" when you start to do the swap.
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04-20-2016, 04:35 PM | #20 |
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Re: Float a motors
where is the best place to jack up the rear to replace the FAM rubbers? does anything need to be loosened or removed?
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