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Replicar328
#1 Posted : 11 February 2019 13:35:58(UTC)
Replicar328

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Hi,

I'm planning to use a 2005 MX5 as a donor car for a 1936 BMW328 replica. The donor is sitting in a rented garage with limited space, so no way to lift the body off, but I'd like to get moving with the design of spaceframe chassis and suspension.

Is there someone within 50 miles of the TW20 postcode who has a car with the body lifted off? - I would be so grateful if I could come and measure a host of dimnsions.

Similar age would be nice, but I believe most of the key dimensions remained the same through that decade....

Adrian

 

Scottishfiver
#2 Posted : 11 February 2019 14:05:36(UTC)
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Call me thick, but I genuinely don't savvy the "body off chassis" intentions...since they are monocoque and therefor.....is it not more a matter of lifting the engine/gearbox out vertically, then dropping out the power frame, suspensikon and subframes with it on a 4 poster? Essentially, there is no body/chassis Beetle style.

grumpybadger
#3 Posted : 11 February 2019 14:15:46(UTC)
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You might try searching/posting on the MEV forum http://mevowners.proboards.com if you haven't already, someone may be in the middle of a build near you.

Current: 2017 Soul Red Mk4 Sport Nav 2.0 / 1990 Eunos now an Orange Exocet. Previous: Arctic White 1.5 Sport Nav Mk4 (New Owner) / 25th Anniversary Edition original owner (New Owner) / 2013 Sport Graphite Limited Edition (New Owner)
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Replicar328 on 11/02/2019(UTC)
Mad Malc
#4 Posted : 11 February 2019 15:15:34(UTC)
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I think he needs to look at and measure a front and rear sub frame, hence the phrase 'lift the body off'. I would normally say 'drop the sub frame from the body'. Or he may want to measure the pickup points on the tub. Either way hopefully someone will be able to help.

Edited by user 11 February 2019 15:19:46(UTC)  | Reason: Not specified

Mad Malc by the sea in Filey with a Mk4 SE-L Nav 2.0 in Artic White
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Replicar328 on 11/02/2019(UTC)
saz9961
#5 Posted : 11 February 2019 15:31:04(UTC)
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Is this for someone who has brought such a body, or for a manufacturer who is being a bit cheeky?
MX5 123
#6 Posted : 11 February 2019 15:32:40(UTC)
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You probably know this but once shell is lifted off the engine/box/suspension/subframes etc drop to ground so you will need measurements while shell still attached. Heights at least. obviously fixed widths will not change.
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Replicar328 on 11/02/2019(UTC)
Drumtochty
#7 Posted : 11 February 2019 15:36:42(UTC)
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Yes on the MK1 and Mk2 cars the subframes are held togethere by the frame from the back of the gearbox to the diff and for a complete refurb one way is to lift the MX5 body off and you have a front sub frame with engine, gearbox, frame, diff and rear subframe.

You would tend to use a two post lift.

Look at the green car on this page about half way down.

https://www.bordermx5s.com/projects.html

Eddie Cairns

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Replicar328 on 11/02/2019(UTC)
Replicar328
#8 Posted : 11 February 2019 18:10:11(UTC)
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Thanks to everyone for all the inputs. I probably should have explained better, but I've seen pictures of the whole drivetrain and suspension with the body having been lifted off.  I know the heights will be wrong, but working out how to incorporate engine mounts and mount the differential into the spaceframe, and whether I can move the inner suspension wishbone pivot points inwards as I have to narrow the track (fairly certain I'll have to fabricate wishbones, but hope to use the uprights). I am sure I could do all this if I could get hold of dimensioned drawings, but it'd be so much easier if I could simply run a rule over the key dimensions.  MEV site looks great, thanks especially for that tip. Such a nice forum, everyone so helpful, really appreciate it.

Adrian

Replicar328
#9 Posted : 11 February 2019 18:19:05(UTC)
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Originally Posted by: saz9961 Go to Quoted Post
Is this for someone who has brought such a body, or for a manufacturer who is being a bit cheeky?

It's just me, I'm a recently retired engineer who's always dreamed of building a replicar 1936 BMW 328 and I found someone who made a glass fibre buck from an original car, so I have bought dimensionally correct body panels. The track is narrower than te MX5, but the wheelbase is just a little longer so the engine can sit a little further back than in the MX5.  I really like the MX5 because it has double wishbone suspension front and back.

Apologies to the purists who would rather see the car restored as an MX5.....

Adrian

DickieRltd
#10 Posted : 14 February 2019 21:03:45(UTC)
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Hi,

It is possible as you say to lift the body off the suspension and drive train. you can set the suspension height with block of wood and roll the frame about.

I suggest you try and get hold of a front and rear subframe to give you the mounting points for a starting point.

How close is the wheelbase to your dream build, as the powerplant frame may have to be lengthened or shortened.

Your bigger problem is to turn the mx5 engine into a six cylinder.

Have you thought about finding a dodgy ratty Vitesse 2 litre  ? the front suspension has graced many a kit car and gives you a great sounding straight 6.

 

 

Above all enjoy your project

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Replicar328 on 15/02/2019(UTC)
Replicar328
#11 Posted : 15 February 2019 09:14:05(UTC)
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Originally Posted by: DickieRltd Go to Quoted Post

I suggest you try and get hold of a front and rear subframe to give you the mounting points for a starting point.

Above all enjoy your project

Hi, this is a nice suggestion, you've nailed the main issues. I will certainly do exactly that before cutting metal.

Searching the web I've found a brilliant dimensioned drawing of the differential and the necessary wishbone and upright dimensions to allow me to check if I can somehow use the same suspension components. I need to narrow the rear track by around 200mm which is ok using the lower wishbones, upper wishbones look like they will clash with the differential anchor points which are 600mm apart.

The wheelbase of my dream car is 2400mm, so 135mm longer than the MX5 which means, using the existing drivetrain including the PPF as it is, the engine can move backwards by 135mm from the front suspension.  Maybe I'm loony, but I'm wondering if it's possible to swap the front wishbones left to right so that the lower wishbone reaches forwards instead of backwards towards the engine?

A six cylinder would be nice, but I've decided to forego this nicety. The shorter block of the 4 cylinder does help to get everything to fit in the narrower car. And now that the Vitesse is a classic, they aren't cheap to buy, and worth restoring if they are dodgy/ratty! With apologies to Meat Loaf "four out of six ain't bad"

Finally, thanks for your final comment - with the onset of electric cars, petrolheads seem to be a dying breed

Adrian

Geoff Walton
#12 Posted : 16 February 2019 07:02:22(UTC)
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This Youtube vid has some interesting stuff, about 14 minutes in https://www.youtube.com/watch?v=gDMrJhpeYiE

 
Geoff
Australia
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Replicar328 on 16/02/2019(UTC)
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