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Bad Vibes

Old 09-14-2003, 11:44 AM
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Bigiron13
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Default Bad Vibes

I got a engine thay vibrates. What can I do?
Bigiron
Old 09-14-2003, 11:58 AM
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Default RE: Bad Vibes

Bigiron13,

Is that type engine normally a shaker or is this the exception?

Some engines will smooth out a bit if you add head shims. Some have optional heads (like the older Enya .29 and .35). For these, the lower compression head seems to run smoother, especially if you are using nitro. If it has a FAI head, you may have to run it without nitro.

If it is underbalanced (like a Fox 35) you might try an unbalanced prop. Install it with the heavy side opposite the piston (i.e. piston down, heavy side up).

Perhaps you have already tried all of these things.

Good luck,
George
Old 09-14-2003, 12:16 PM
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William Robison
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Default RE: Bad Vibes

Bigiron13:

Tell us what engine it is, and what prop you have on it.

As George said, some engines are just shakers, other engines should not be.

But the most basic thing, usually, is balancing the prop. Please note "Usually." First, if the prop is any amount out of balance, do as George said and put the heavy blade opposite the crank throw.

Bill.
Old 09-14-2003, 12:40 PM
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Jim Thomerson
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Default RE: Bad Vibes

Marvin--Torque them mounting bolts down!

Jim
Old 09-14-2003, 09:24 PM
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Bigiron13
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Well, I wuz gonna let this ride a bit, but Jim knows me. so I will tell all.
My engine was running quite smoothly til I hit a big rock---- Now the prop on my lawnmower looks like a figure S and the motor vibrates. (Chuckle) Just kidding guys. I just got on here and thought that this was better than saying that my Honda clatters. (Shades of Isky's board)
Thanks for the come-back guys. Am I still welcome here?
This board seems a bit more relaxed and laid-back than that stuffy one.

Bigiron aka Marvin Denny
Old 09-14-2003, 09:37 PM
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Default RE: Bad Vibes

I've found the problem is usually too high of compression. What ya need ta did was pull that plug thingy out, then she'll be all topish and spin true.
Old 09-14-2003, 11:28 PM
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Default RE: Bad Vibes

Hey Marvin.

Who are you trying to kid?!?

Paul
Old 09-14-2003, 11:32 PM
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William Robison
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Default RE: Bad Vibes

Clean:

You have part of the idea, but leaving the plug out lets dirt get inside.

What he needs to do is pull the backplate and grind the rod-like thingy away. Get it all out.

Bet it will turn smoothly then.

Haw.

Welcom, BigIron, and may your stay be pleasant.

Bill.
Old 09-14-2003, 11:34 PM
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Default RE: Bad Vibes

Oops!! I really should read the entire thread before posting replies. Sorry.
Old 09-15-2003, 01:05 AM
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William Robison
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Default RE: Bad Vibes

Paul:

It's OK, really.

We expect people in Alaska to be a little slow. The cold gets to them.

Tell me. Is Halibut Guts anywhere near Mackeral Snapper Slough?

I used to live near a place known as Rattler Ravine, but that was in Texas.

Haw.

Bill.
Old 09-15-2003, 08:09 AM
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Default RE: Bad Vibes

But when you do that,
The spark plug doesn't spark,
the distributor doesn't distribute,
and the piston doesn't work either.


George
Old 09-15-2003, 09:23 AM
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Bigiron13
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Default RE: Bad Vibes

Funny thing Bill: I used to live in Texas near Childerss , on Rattlesnake Hill. Not a good place to fly freeflight.

bigiron
Old 09-15-2003, 02:05 PM
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BI:

When I was in Wichita Falls I enjoyed going to Lawton Oklahome for the "Rattlesnake Roundup."

Bill.
Old 09-15-2003, 02:28 PM
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Bigiron13
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Default RE: Bad Vibes

I went to a couple of those in the late forties.
Bigiron

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