Solid motor mount vibration
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5th Wheeling
Joined: Nov 2020
Posts: 39
Likes: 4
Solid motor mount vibration
Hello! New to posting but I've been lurking for a while and this forum is a great resource.
Unfortunately my 79 f150 4x4 with a 460 swap recently had a catastrophic failure and its time to rebuild everything.
My question is about solid vs rubber motor mounts. Seeing as the cab is isolated from the chassis by rubber mounts and the steering wheel is isolated by the rag joint, will solid mounts actually make a noticeable uncomfortable difference while driving?
Unfortunately my 79 f150 4x4 with a 460 swap recently had a catastrophic failure and its time to rebuild everything.
My question is about solid vs rubber motor mounts. Seeing as the cab is isolated from the chassis by rubber mounts and the steering wheel is isolated by the rag joint, will solid mounts actually make a noticeable uncomfortable difference while driving?
Lead Driver
Joined: Jul 2017
Posts: 9,606
Likes: 1,175
From: San Jose, CA
I would think it would be at least slightly noticeable. But probably not the end of the world.
But why bother? You making a drag truck or mud-bogger out of it? The original style mounts were usually very robust and could last 100,000 miles and often way more, before needing any attention.
And they are safety type mounts anyway, with metal studs, or interlocks to keep the engine in place in case the rubber did ever give way. Usually after much soaking in oils and chemicals and old age.
Not sure I've even seen solid mounts before. Got a link to pics of them?
And what was the catastrophic failure? Sorry to hear you had one, but very curious what it was.
Paul
But why bother? You making a drag truck or mud-bogger out of it? The original style mounts were usually very robust and could last 100,000 miles and often way more, before needing any attention.
And they are safety type mounts anyway, with metal studs, or interlocks to keep the engine in place in case the rubber did ever give way. Usually after much soaking in oils and chemicals and old age.
Not sure I've even seen solid mounts before. Got a link to pics of them?
And what was the catastrophic failure? Sorry to hear you had one, but very curious what it was.
Paul
Thread Starter
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5th Wheeling
Joined: Nov 2020
Posts: 39
Likes: 4
I would think it would be at least slightly noticeable. But probably not the end of the world.
But why bother? You making a drag truck or mud-bogger out of it? The original style mounts were usually very robust and could last 100,000 miles and often way more, before needing any attention.
And they are safety type mounts anyway, with metal studs, or interlocks to keep the engine in place in case the rubber did ever give way. Usually after much soaking in oils and chemicals and old age.
Not sure I've even seen solid mounts before. Got a link to pics of them?
And what was the catastrophic failure? Sorry to hear you had one, but very curious what it was.
Paul
But why bother? You making a drag truck or mud-bogger out of it? The original style mounts were usually very robust and could last 100,000 miles and often way more, before needing any attention.
And they are safety type mounts anyway, with metal studs, or interlocks to keep the engine in place in case the rubber did ever give way. Usually after much soaking in oils and chemicals and old age.
Not sure I've even seen solid mounts before. Got a link to pics of them?
And what was the catastrophic failure? Sorry to hear you had one, but very curious what it was.
Paul
My catastropic failure was that the trans extension housing between the c6 and the np205 exploded while on the highway. One of the motor mounts tore and my driveline broke at the u joint and fell off the bottom of the truck. I'm sure the guy behind me was scared haha. Not exactly sure what caused all that but everything not broken still seems to move freely and work properly. At the very least I will be rebuilding trans (for the second time), replacing motor mounts and u joints, and ripping the axels apart just to make sure nothing locked up and broke in there. Engine turns over fine but i haven't had it running for obviously reasons.
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5th Wheeling
Joined: Nov 2020
Posts: 39
Likes: 4
How bad was the vibration? Im sure you didn't feel it much on track but how did it feel at idle or if you ever had it on a smooth surface?
Cargo Master
Joined: Jun 2014
Posts: 2,217
Likes: 325
From: Central Florida
If cost is the leading factor, go with rubber b/c you'll spend less in the long run. Racers use engine plates and solid mounts in conjunction with roll cages that significantly reduce flex and consequent damage.
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Logistics Pro
Joined: Oct 2006
Posts: 4,031
Likes: 891
From: East Central Ia
I often wonder how much load the mounts on a block can take from a little twist in the frame and engine torque. I bought some replacement engine mounts once that were cheap chna crap, they were so solid and vibration was bad. Had to replace again with OEM and vibration gone.
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Laughing Gas
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From: upstate ny
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5th Wheeling
Joined: Nov 2020
Posts: 39
Likes: 4
Haha well that sounds like it would rattle your bones either way
Laughing Gas
Joined: Feb 2007
Posts: 962
Likes: 89
From: upstate ny
yea was one of those built for speed not comfort deals those were good times though. Maybe a good quality rubber or poly mount would be a good fit for you
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5th Wheeling
Joined: Nov 2020
Posts: 39
Likes: 4
Follow up question for you guys... if I go with the rubber mounts, are there any headers under $400 that will fit the 460 swap with 4x4 and not require me to modify the rubber mounts? (Cheapest I see so far are like $580)
Any suggestions for a quality rubber mount that won't just tear?
Any suggestions for a quality rubber mount that won't just tear?
Lead Driver
Joined: Jul 2017
Posts: 9,606
Likes: 1,175
From: San Jose, CA
I'm not sure. Is L&L still the only game in town, or are there others now?
And why would you have to modify the mounts to use headers? Is clearance at such a premium with the 460 in there?
And speaking of mounts... I just caught (again) the fact that your original mount tore. Did it separate completely, or did it have a metal interlock to keep it from separating?
Most modern mounts are supposed to be made with that safety interlock so that you don't have things tearing themselves apart. Been kind of a thing since the late sixties. So I figured by now they all had them. Maybe not...
Paul
And why would you have to modify the mounts to use headers? Is clearance at such a premium with the 460 in there?
And speaking of mounts... I just caught (again) the fact that your original mount tore. Did it separate completely, or did it have a metal interlock to keep it from separating?
Most modern mounts are supposed to be made with that safety interlock so that you don't have things tearing themselves apart. Been kind of a thing since the late sixties. So I figured by now they all had them. Maybe not...
Paul
Thread Starter
|
5th Wheeling
Joined: Nov 2020
Posts: 39
Likes: 4
I'm not sure. Is L&L still the only game in town, or are there others now?
And why would you have to modify the mounts to use headers? Is clearance at such a premium with the 460 in there?
And speaking of mounts... I just caught (again) the fact that your original mount tore. Did it separate completely, or did it have a metal interlock to keep it from separating?
Most modern mounts are supposed to be made with that safety interlock so that you don't have things tearing themselves apart. Been kind of a thing since the late sixties. So I figured by now they all had them. Maybe not...
Paul
And why would you have to modify the mounts to use headers? Is clearance at such a premium with the 460 in there?
And speaking of mounts... I just caught (again) the fact that your original mount tore. Did it separate completely, or did it have a metal interlock to keep it from separating?
Most modern mounts are supposed to be made with that safety interlock so that you don't have things tearing themselves apart. Been kind of a thing since the late sixties. So I figured by now they all had them. Maybe not...
Paul