11 replies to this topic

[[email protected]]

As per title.

I have read bits on here about solid mounts and I now regret rushing ahead and purchasing some polyflex top mounts for my front subframe. I already ordered and opened the polyflex top mounts which was stupid of me... so i can't send them back for a refund. I'd rather not waste them.....so is it ok to fit the poly flex top mounts and then solid mount the bottom of the subframe?

Thanks,

Mike

[Dan]

I would say not I'm afraid. Solid rear mounts for the late front frame put enough stress into the shell to fracture the floor when the whole frame is solid mounted. If the top can move and the bottom can't I imagine it would make this effect even more dramatic. Also why is the frame being solid mounted? If it's for a flip front then it's vital the top is solid mounted. Why can't you return them?

[mike.]

I ordered solid mounts all round for mine, and when it came to fitting them I found the floor mounts were already solid. So basically my car had solid floor mounts and standard rubber top mounts and I had no problems so i'd say it'd be fine.

[Tommyboy12]

I have polybush top mounts and solid floor mounts. Transfers a lot of engine bay noise and I have had the floor crack at both floor mounts.

[[email protected]]

Ah thank you for the replies guys!

Basically, I can't return them because i opened the sealed packaging they were in...so they can't be resold really.
But it was only a tenner.....so if its worth it, i'll just put them aside and buy solid mounts all round!


Yes, i have a removable fibreglass front end, a custom subframe (with brace bars) with B18 VTEC engine in. The subframe has been on and off the car many times. However this is the final time the subframe comes off the car so I want to make sure its mounted in the best possible way. So that i don't have to correct it at a later date.

I did actually think the stress would be even more on the bottom mount if the top is poly mounted....so at least you've all confirmed that to be a bad idea now!

What would you guys recommend then? With performance primarily in mind

[Pistonbroke]

Ah thank you for the replies guys!

Basically, I can't return them because i opened the sealed packaging they were in...so they can't be resold really.
But it was only a tenner.....so if its worth it, i'll just put them aside and buy solid mounts all round!


Yes, i have a removable fibreglass front end, a custom subframe (with brace bars) with B18 VTEC engine in. The subframe has been on and off the car many times. However this is the final time the subframe comes off the car so I want to make sure its mounted in the best possible way. So that i don't have to correct it at a later date.

I did actually think the stress would be even more on the bottom mount if the top is poly mounted....so at least you've all confirmed that to be a bad idea now!

What would you guys recommend then? With performance primarily in mind

Hi,

Just to add more confusion I have solid top and bottom mounts on my 1380cc, this too has a flip front. I was a bit concerned about the floor cracking so I made up some spreader plates to fit internal and external to spread any stress so far no problems, been installed about two years now.

[Sprocket]

Yes, either fit all poly bushes or all solid mounts. Never mix solid woth poly mounts. And yes, the toeboard/ floor pan will crack at the point where the subframe bolts to it, if you use solid bottom and poly top. I had the pleasure of repairing the crack on the driver side on mine

Edited by Sprocket, 30 July 2011 - 08:42 PM.

[[email protected]]

Ahaaa.....i see!

I don't want that happening so i'm going to strengthen it somehow.

How do these spreader plates work? Does anyone have any pictures of the plates they've welded in?

[Pistonbroke]

Ahaaa.....i see!

I don't want that happening so i'm going to strengthen it somehow.

How do these spreader plates work? Does anyone have any pictures of the plates they've welded in?

Hi ,
Give me some time and I will take a couple of pictures of the plates for you. They are nothing special, just bought some plate steel and cut them larger than the bottom mounts (about 25 - 30 mm) than made similar for the inside and bolted the bottom subframe mount through these plates. I did not weld these in place in case the floor crack and I needed to remove these to inspect and weld. As I said previously they work for me, so far no problems!. However you might want to consider making sure your lower and upper engine steadies and gearbox mounts are up to scratch. and hold the engine steady. Can't say if this would work on a modified subframe to take a non mini engine?

Good luck

Pistonbroke

[[email protected]]

Thank you very much indeed.....that's brilliant! Looking forward to the pictures

[Notay]

Ahaaa.....i see!

I don't want that happening so i'm going to strengthen it somehow.

How do these spreader plates work? Does anyone have any pictures of the plates they've welded in?

Hi ,
Give me some time and I will take a couple of pictures of the plates for you. They are nothing special, just bought some plate steel and cut them larger than the bottom mounts (about 25 - 30 mm) than made similar for the inside and bolted the bottom subframe mount through these plates. I did not weld these in place in case the floor crack and I needed to remove these to inspect and weld. As I said previously they work for me, so far no problems!. However you might want to consider making sure your lower and upper engine steadies and gearbox mounts are up to scratch. and hold the engine steady. Can't say if this would work on a modified subframe to take a non mini engine?

Good luck

Pistonbroke

Hi I would be interested in the pics too since I have just discovered a crack on the driver side where the previous owner had solid floor mounts but left the top tower mounts to standard rubber - so could really do with some idea into how to fix myself with support plates. Cheers

[mike.]

In this case ignore my advice above. I drove my car hard for a year with solid bottom mounts and rubber top mounts (without realising) and had no problems, but I must of got lucky!