Dear collective brain......

I have used solid engine mounts (steel) on previous formula cars.

Has anyone any experience of using them on 7 type race cars please.

Regards
Jack

This is going to depend heavily on what engine you intend to use.... BEC boys are usually solid mounted as per a bike... but a vibrating car engine isn't really the best of things to be mounted solidly... I think a chap on here tried it with a big engine and couldn't touch the gearstick due to the vibrations...

Even the properly mounted BECs use polybushes IMO.
Would shake your typical 7 chassis to pieces, unless you want to add more weight reinforcing the chassis, which would likely negate any performance gained from solid mountings.
if you are going big power, 2 engine, one gearbox and an engine brace at high level should suffice.

I have both, that is a Westfield Megabusa and a Sylva J15/Sigma.

The J15 kit came with more or less solid mounts and it was a nightmare when I first drove it, I thought the chassis was going to disintegrate and me with it. Apparently fitted with a road cam'd Ford Sigma engine and solid mounts is the worst combination possible. I had to retrofit flexible engine mounts.

On the Westfield BEC the mounts are solid. This is relatively normal for a BEC track car. However if I were using it on the road I would probably fit mounts. The transfer of vibration is considerable but as the frequency 12K max revs (lower mass flywheel) appears to makes the problem less urgent, also I am usually wearing a helmet. I suspect if I tuned the Hayabusa like I did the Sigma the problem may get far worse. Tuned engines tend to vibrate more I am told.

Hope this helps

[Edited on 28/10/14 by theprisioner]

Thanks for the input chaps.

Rubber mounts for me then