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View Full Version : New Engine + New Motor Mounts = #$&@ at 1000RPM


jrowell
October 17th, 2017, 14:43
Dropped a new engine in my 87 along with aftermarket Motor Mounts. I only have about 1 mile on it so for, but noticed there is SIGNIFICANT vibes between 800-1200 RPM's. Before and after those rpm's the vibes are only slightly more than the stock engine/motor mounts. The vibes happen driving and in park. Could the vibes point to any other problems? or is it just a quirk of my new setup?

sinat01
October 17th, 2017, 14:50
what motor mounts? good rubber mounts will transmit more vibrations for a while. especially new. poly ones are even worse. My ironman4x4fab motor mounts vibrated pretty bad when I first put em in, but they arnt bad at all now.

jrowell
October 17th, 2017, 18:07
what motor mounts? good rubber mounts will transmit more vibrations for a while. especially new. poly ones are even worse. My ironman4x4fab motor mounts vibrated pretty bad when I first put em in, but they arnt bad at all now. they are a poly blend. They vibes are only slightly more than stock through all the other rpms... very acceptable. At 1k rpm feels like a vibrating massage chair on overdrive!

Sent from my SM-G930V using Tapatalk

jrowell
October 17th, 2017, 18:19
they are a poly blend. They vibes are only slightly more than stock through all the other rpms... very acceptable. At 1k rpm feels like a vibrating massage chair on overdrive!

Sent from my SM-G930V using Tapatalk I'm betting that the rpms are just resonating in that area. I'm told as I put more miles on them it'll calm down. I'm not worried about the vibes so much as me doing something wrong on the engine install.

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sinat01
October 17th, 2017, 18:28
mine vibrated at idle and when letting the clutch out for the first couple thousand miles, and they are rubber, poly might take longer to wear in

csailors
October 17th, 2017, 19:50
I have brown dog poly mounts and I stared out with the through bolts too tight. It vibrated awful.

Loosen the through bolts a little on each side and test drive until the vibration is gone. I’d bet you tightened the though bolt and nut tight.

kcox506
October 17th, 2017, 19:59
I understand vibes are annoying to most but thats what torque transfer feels like ;)

Jeep Driver
October 17th, 2017, 21:29
Make your own, far better off.

jrowell
October 17th, 2017, 21:34
Make your own, far better off.Make my own what?

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Jeep Driver
October 17th, 2017, 21:39
Make my own what?

Sent from my SM-G930V using Tapatalk

http://i.imgur.com/zpdB30eh.jpg (https://imgur.com/zpdB30e)


Stock replacements suck and brown dogs suck.

jrowell
October 17th, 2017, 21:50
http://i.imgur.com/zpdB30eh.jpg (https://imgur.com/zpdB30e)


Stock replacements suck and brown dogs suck.I agree, that's why I didn't go with either of those.

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Jeep Driver
October 17th, 2017, 22:12
I have 0 vibes at any rpm and 0 torque roll.

Inserts can be found at NAPA..........well over 100 different designs.

kcox506
October 17th, 2017, 22:21
http://i.imgur.com/zpdB30eh.jpg (https://imgur.com/zpdB30e)


Stock replacements suck and brown dogs suck.

Is the bushing housing only tacked to the mount as shown on both sides?

Jeep Driver
October 17th, 2017, 22:31
It's captured, I used a press to compress the outer band before I welded it. It ain't going anywhere.

3" OD IIRC.............same insert sized used in hundreds of makes and models. Mine was for a Toyota Camry.
You could go to the PnP and get a couple of mounts to cut the bracketry off and use the press ring.....whatever you want to do.

You can also drill and fill with weld in the center of the band or you can drill and tap for a short bolt (2) and thread two button heads through the band into the insert thus mechanically combining the two.

however you want to design it.

Jeep Driver
October 17th, 2017, 22:34
http://i.imgur.com/V4tD9Q0h.jpg (https://imgur.com/V4tD9Q0)


http://i.imgur.com/g2bsCpth.jpg (https://imgur.com/g2bsCpt)

csailors
October 18th, 2017, 06:58
http://i.imgur.com/zpdB30eh.jpg (https://imgur.com/zpdB30e)


Stock replacements suck and brown dogs suck.

Why do you say this about brown dog mounts?

sinat01
October 18th, 2017, 12:32
personally I like my Ironman4x4fab motor mounts. rubber bushings and well built mounts. plus ironman andy is a good guy

Boostwerks.com
October 18th, 2017, 12:43
http://i.imgur.com/V4tD9Q0h.jpg

You do realize you mounted that bushing about 60 degrees off right? That gap is designed to be at the top.

Jeep Driver
October 18th, 2017, 15:35
http://i.imgur.com/V4tD9Q0h.jpg

You do realize you mounted that bushing about 60 degrees off right? That gap is designed to be at the top.

Says whom?

Jeep Driver
October 18th, 2017, 15:43
Why do you say this about brown dog mounts?

Because I installed my new engine with them, they suck.

http://i.imgur.com/7mZpKbuh.jpg (https://imgur.com/7mZpKbu)

Jeep Driver
October 18th, 2017, 15:47
http://i.imgur.com/V4tD9Q0h.jpg

You do realize you mounted that bushing about 60 degrees off right? That gap is designed to be at the top.


To answer your question-

I need to gain 1.5" to keep my engine under the hood. Since I wanted to replace the brown dogs anyway, I specifically chose those mounts so I could adjust the exact amount of drop I wanted, then I took the remainder out of the hood.


http://i.imgur.com/XWq8aG6h.jpg (https://imgur.com/XWq8aG6)

http://i.imgur.com/kGLUlKIh.jpg (https://imgur.com/kGLUlKI)

http://i.imgur.com/iWOiROvh.jpg (https://imgur.com/iWOiROv)



I know exactly what I'm doing.



http://i.imgur.com/RpgL3TIh.jpg (https://imgur.com/RpgL3TI)

csailors
October 18th, 2017, 18:17
So your answer is because they didn’t fit your custom application they suck. ? Or they suck. Is just your personal opinion answer? I assume you also bought poly mounts and then complained and blamed the company they transmit to much vinration to the unibody. Sound research methods to me.

I tore all the factory style mounts I put in my jeep on single outings. Zero field failures to date with brown dog poly mounts. After 2+ years of wheeling. Normal vibes for ploy mounts. They are a good product with excellent support.

If your going to put information in a tech section at least make it useful and not just bashing vendors and supporters of our hobby because of a bad choice in your part. Some sensible tech, where you arnt butt hurt from some constructive criticism.

OP. Sorry for the hijack. What the latest?

Green XJ Jeep
October 18th, 2017, 19:02
Says whom?

Toyota

themauler
October 18th, 2017, 19:29
0 torque roll.

That 2.5l pavement pounder must be a torque monster :rattle:

Ben824
October 19th, 2017, 11:05
I will put my .2 cents in. I had Rusty's poly mounts and then their rubber mounts several years ago. I heard the advice to play with the tightness of the through bolts and tried that with little success. My Jeep was in pretty good running condition for an old Jeep that was only around 10 years old back then. I couldn't stand them though. The vibrations drove me crazy because anything that could make a squeak or ticking sound would from the vibrations. At speed they were fine and I loved the quick tight response the Jeep got from the torque quickly getting to the ground rather than waiting on the looser factory mounts to tighten up and get that torque to the ground. I hope that makes sense! haha But the vibrations drove me insane in traffic. I had to switch back to factory mounts since my Jeep is my daily driver and I sit in a lot of stop and go traffic down here around the Atlanta area.

JohnX
October 19th, 2017, 13:41
OMG....seriously?!? Cut the effing hood to fit a stock motor? :roflmao: :roflmao: :roflmao: :roflmao: :roflmao: :roflmao: :roflmao: :roflmao:

Jeep Driver
October 20th, 2017, 05:51
OMG....seriously?!? Cut the effing hood to fit a stock motor? :roflmao: :roflmao: :roflmao: :roflmao: :roflmao: :roflmao: :roflmao: :roflmao:


There is nothing stock about that engine.


That's not a motor anyway, it's an engine, be correct, this is "tech".

Jeep Driver
October 20th, 2017, 05:52
Toyota

No.

You of all people really don't know what you are talking about.

Green XJ Jeep
October 20th, 2017, 08:18
No.

You of all people really don't know what you are talking about.

I know thats a toyota part number which makes it a motor mount and i know it is installed almost upside down. Which is opposite the engineers intended direction.

Now my question is,
Have you thought about using a liquid rubber or silicone to support the underside of the through bolt on the drives side?
Pass side if mounted the same should be fine fine.

JohnX
October 20th, 2017, 08:35
There is nothing stock about that engine.


That's not a motor anyway, it's an engine, be correct, this is "tech".

Thanks for the correction, I was really worried people wouldn't be able to figure out what I meant. :lecture:

RCP Phx
October 20th, 2017, 09:28
they are for a '97 Camry.
http://i.imgur.com/aKEKIwR.jpg (http://imgur.com/aKEKIwR)




If your going to tell stories, you should at least keep them consistent!

jrowell
October 20th, 2017, 09:36
Took my first real drive yesterday. On the freeway everything is smooth. City driving is pretty good, with only slightly more vibes. I don't mind them and maybe even prefer them? I can feel what the motor is doing, if that makes sense. Still have that shutter around 1k RPM but it not too bad.

Maybe I was just hyper sensitive to it as this is a new motor and I am really trying to make sure everything is good with my install of it.

On a side note, I really like driving my heep again!

Jeep Driver
October 20th, 2017, 10:07
If your going to tell stories, you should at least keep them consistent!

And just what is my inconsistent story

Jeep Driver
October 20th, 2017, 16:58
Still waiting for you to tell me what I'm lying about.

jrowell
November 25th, 2017, 18:26
Well, I'm about 500 miles in in the new engine. I'm happy to report Vibes are almost completely gone at all RPMs. Guess i just needed to break in the new mounts. https://uploads.tapatalk-cdn.com/20171126/f7aa6bdac7599f32b663018fbd0cef63.jpg

Sent from my SM-G930V using Tapatalk

BCKNBLK
December 2nd, 2017, 11:56
Try what csailors suggested, and ensure the weight of the engine is on the mounts before you final tighten the center bolt. I have a set from Mountain Off Road that I installed about 6 months ago, they were outstanding right from the beginning, and quite beefy!