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Crossflow Engine Mounts
phad88 - 4/4/07 at 12:06 PM

Hi
Currently race in 750mc and the engine is on rubber mounts from Luego. However i've noticed alot of engine movement! I've read previous threads and its 50/50 for and against solidly mounting it! The fear is the welds cracking, bolts is not a major concern as before each meet a spanner check is always carried out. I was thinking of using polyurethane anyone experienced this? if so what did you use i.e make, model, and cost of bushes used.
Cheers
Mark

GazzaP - 4/4/07 at 01:12 PM

Hiya

i had the same problem, to cure this i have got the group a mounts from vibratechnics they stiffen it up loads

www.gmpmotorsport.co.uk

procomp - 4/4/07 at 01:32 PM

Hi as ^ GAZZAP said. Available from rally desighn.

The main reason for not solidly mounting is not so much the chassis/mount cracking but the fact that you will be changing altenator and starter motors every five minutes. (and we know how the scrutes are checking altenators these days) Due to vibrations.

cheers matt

02GF74 - 4/4/07 at 01:34 PM

quote:
Originally posted by procomp


The main reason for not solidly mounting is not so much the chassis/mount cracking but the fact that you will be changing altenator and starter motors every five minutes.


I don't understand ^^

does solid mounting damage the starter and alternator??

as an aside, I made a truss bar with exhaust rubbers to tie the top of an B series engine in an MGB cuase I read somewhere it would gain some power, the arument that the power would go to the wheels instead of twising the engine. dunno if it made much difference but when one of the mounting let go, it didn;t have make a racket!! I was so used to diggin about in the engine bay I managed to disconnect it in total darkness

[Edited on 4/4/07 by 02GF74]

procomp - 4/4/07 at 01:52 PM

Hi when solid mounting some engines (ussually older desighn) that are going to be seeing 7000+rpm every lap. They tend to transmit thier vibrations through attached parts such as starter motors and altenators.

In the locost championship the scrutineers are checking more often to see if the altenators are fully working.

Cars with non fully working items are excluded from the results. Therefore it is not worth solid mounting as the uprated group A mounts are more than good enough for the application.

cheers matt

Simon W - 4/4/07 at 01:54 PM

Edit. Slow posting

[Edited on 4/4/07 by Simon W]

Mr Whippy - 4/4/07 at 02:08 PM

I had not heard of that being a problem, at least with the alternators you could build in flexi mounts for it.

procomp - 4/4/07 at 04:15 PM

Hi but then not std for the championship regs. And why go to all the extra work and weight when there is a verry easy fix by using the group a mounts for this paticular application.

cheers matt

phad88 - 13/4/07 at 04:18 PM

Thanks for the replies,

Quite pricey for the Vibratechnics is there any alternatives? I was thinking of using some 70 shore hardness Polyurethane and machining them and then bolt them straight through with an M12. I would have thought poly will take out majority of vibration?

paulf - 13/4/07 at 08:44 PM

I have a set of crossflow mounts that were in my road car , they used fiesta rubbers set at an angle similiar to the original set up and I found there was hardly any engine movement which was handy as i had very little clearance with the bonnet.
Paul.

Marcus - 14/4/07 at 09:42 AM

The Landrover V8 mounts you pick up at autojumbles for a few pennies are ideal. Absorb just enough movement.

Simon W - 28/4/07 at 07:20 PM

Are the correct vibratechnics mounts showing on the page below? (if so, whats the desription)

http://www.rallydesign.co.uk/catalog/index.php?cPath=1740_1741_1750

Thanks .