Jump to content

Engine mounts


dougbgt6
 Share

Recommended Posts

I was discussing engine mountings with Andy Cook at the EB meeting the other night. When I fitted the side panels to my GT6 the air filter box fouled the top of the side panel so I cut the panel down leaving a gap of about an inch under the box. I edged the with rubber and it looks OK. However I notice the rubber is showing signs of being whacked by the air filter box which means the engine is flexing an inch. We didn't think that was acceptable and new mounts were required.

Then we got to thinking about the quality of engine mounts currently available and wondered if polybush replacements are available or, if they exist, would be the right thing to go for? I had a trawl on here and it appears Chris Witor does Superflex engine mounts for 2000/2500s. His web site appears to be under construction and as yet shows NO Spitfire/GT6 spares. I've emailed him to see if he does them, but no reply yet. The 2000/2500 ones are £27.50 + vat each, so £66 a pair while a rubber set from the club shop would be £18. Is it worth it? Does anybody have supplier recommendations?

Doug

Link to comment
Share on other sites

20 minutes ago, Pete Lewis said:

the 2000/2500 ones are a block design  not the Vee  used on the small chassis cars so not interchangeable 

Yeh, I sussed that, that's why I've asked him if he does them, I assume they'll be about the same price.

But do I NEED them? If I can find quality rubber ones they should see me out.

Doug

Link to comment
Share on other sites

I've had to replace both engine mounts and the gearbox mount on my Spitfire since getting it back on the road - actually, that's not strictly true, one of the engine mounts fell apart before I even put the carbs back on - having fitted new ones when I built up the rolling chassis. Admittedly they had been on the car for some years, but the engine had never run when the first one failed, and it had only covered perhaps 1000 miles when the others went. So I'd also be very interested in a source of good quality ones.

Link to comment
Share on other sites

When my engine was rebuilt I changed the mounts as although on 5 years had l done less than 5k miles and were splitting. The new ones were from Rimmers or Paddocks but this seems to be a recurring problem. Please keep us informed. 

Iain 

Link to comment
Share on other sites

Not being spitfire or gt6 , i replaced the failed gearbox mount on my 2500s with a polybush version. So it seems the 2000 range is covered. Never seen the small chassis range mounts though. According to YouTube! Its possible to make your own but i would prefer to buy a set! With all the other bushes available it's strange this has been missed. Maybe the club could contact a manufacturer as there seems to be a market amongst club members?

Link to comment
Share on other sites

on most metalastic type mounts  some flaking around the edges or a bit of surface ozone cracking is pretty common 

doesnt mean the main bonding is failing 

the trouble with cheap repro is the rubber and bond process is not controlled 

would be good to following up Chris Witor for some small chassis poly would at least end up with the right hardness

not just something that looks like a mount as is the case with copies that dont follow a specification.

i  wonder if Robush can help ?? they do good rotor flex couplings 

http://mountfinder.trelleborg.com/AVSMount/Display3DRenderStill/44318307-980f-47a4-9088-3e7195988de1

 

Pete

Link to comment
Share on other sites

23 minutes ago, Mathew said:

Don't think engine mounts should be hard as the vibration would be annoying 

I bought some new mounts about 25 years ago, fitted them and wondered what was wrong, tgx car felt horrendous with vibrations going through the whole car. Refitted the old ones, all was OK. Back then j managed to find some proper NOS ones, that lasted the life of the car. 

I think witor could make poly versions, but would be reluctant as most small chassis owners are more interested in price than quality. I know there are some who would pay but sadly the numbers don't often add up for a supplier. Unless somebody can get enough orders/deposits in to make it look viable.

 

Anyway, my solution has been to use jag e type engine mounts. Oem and still available at about 3x the cost if cheap alternatives. But they last well. Wouldn't be an easy solution on most small chassis cars though.

Link to comment
Share on other sites

I'm not too au fait with GT6 mounts (yet).  However, rubber mounts are sometimes designed to be a 'design failure' part. Having a solid mount might lead to something more expensive further down the line.  Hmmm.

Naturally I'm interested in how this pans out. From what I've seen & read, it would appear that the current mounts are consumable items. As such, replaced on a 6,000-12,000 interval.

Cheers,

Ian.

Link to comment
Share on other sites

43 minutes ago, Ian Smith said:

As such, replaced on a 6,000-12,000

I wouldn't have minded a 12000 mile interval but the ones on my Spitfire needed replacing at <2000 miles, or in one case at 0 miles.

As DanMi said, the ones on my GT6 are at least 30 years old and the ones on the Vitesse showed no sign of needing replacement at a similar age. They were not originally consumable

Link to comment
Share on other sites

Yes, I can understand all of that. Sad to say that you wouldn't expect things like engine mounts to fail. However, we live in different times, and whilst some things improve, some don't. My worry would be that a rigid mounting would set up problems further down the drive train. 

 

Link to comment
Share on other sites

1 minute ago, Ian Smith said:

My worry would be that a rigid mounting would set up problems further down the drive train. 

 

The correct poly mount with the right shore rating should be like the original but last years, but its not in manufacturers interests to make something that lasts a long time.

Link to comment
Share on other sites

3 minutes ago, Mathew said:

The correct poly mount with the right shore rating should be like the original but last years, but its not in manufacturers interests to make something that lasts a long time.

Quite. One problem is manufacturers quantity  If a unit producer makes X-thousand units, that's fine, But when you're down to a couple of hundred a decade, it can get problematic.  

Link to comment
Share on other sites

Another problem is incentive. If you're making a part for a current production car, for which the car maker needs half a million a year as long as the car is popular, it's in all parties' best interests to provide good quality, as the market will decide whether to keep buying that car based on it. If, however, you have a captive market of perhaps ten thousand cars and falling, it's in your financial interest to produce utter crap that needs to be replaced regularly. If your product lasts for ever, you've only got one batch you can sell.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

×
×
  • Create New...