I got a engine thay vibrates. What can I do?
Bigiron

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

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.

Marvin--Torque them mounting bolts down!

Jim

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

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.

Hey Marvin.

Who are you trying to kid?!?

Paul

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.

Oops!! I really should read the entire thread before posting replies. Sorry.

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.

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


George

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

bigiron

BI:

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

Bill.

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