trevw
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| posted on 11/7/22 at 02:28 PM |
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MX5 NC gearbox mount
Hi,
I'm curious about how people that use it have mounted the MX5 Mk3/NC gearbox to their chassis? I'm switching from a type 9 as I'm going
from pinto->duratec.
It seems to fit between the chassis rails pretty well which was concern No.1 It's definitely a lighter gearbox than the 9 when lugging them both
about (though I believe you can get ally bellhousings to help with the weight of the type 9).
It looks like I'm going to have to remove the cross piece closest to the gear lever and shift it back about 3-4 inches as the gearbox is too
high/slightly too far back in the picture below..
The only alternative I can see is to chop off the undercarriage section of the box itself that comes down underneath the gearbox that has the two
mounting bolts on the bottom (it looks like it is there just for something strong to have the bolts on?). I could then use the brackets/bolt holes to
the sides where the prop shaft goes in to mount to the chassis.. I think the MX5 uses the gearbox structurally in some way (hence the massive bolts on
the bottom and side) which obviously won't be the case here.. has anyone taken an angle grinder to this bit of an MX5 box? I know people (and
caterham) get rid of the side bolts
I'm guessing the Caterham uses those two bottom bolts as the main mount with this bracket
https://caterhamparts.co
.uk/mounts/5439-gearbox-mount-5-speed-mazada-gearbox.html?search_query=mx5+mount&results=162
Any thoughts/experiences out there?
[Edited on 11/7/22 by trevw]
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big_wasa
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| posted on 11/7/22 at 07:15 PM |
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I would have a look at retroford and Mk. As far as I know the back four holes are for a vibration damper and are not upto the load of mounting it.
It wouldn’t fit easily in an early classic Mk Indy.
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big_wasa
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| posted on 11/7/22 at 07:53 PM |
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trevw
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| posted on 12/7/22 at 04:58 PM |
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Thanks! Retroford was a good shout, they've got a pdf and it looks like they do use the brackets at the end..
https://www.retroford.co.uk/wp-content/uploads/2020/01/MX5
-Gearbox-Technical-Guide.pdf
Another forum suggested Vitesse and it looks like they do the same:
https://www.vitesse-ltd.com/products/mgb-5-speed-mazda-gearbox-conversion-kit-5-bearing-engine-vitmgb258?variant=21481998647379
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big_wasa
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| posted on 12/7/22 at 05:17 PM |
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I never got as far as looking at mounting it
[Edited on 12/7/22 by big_wasa]
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