MK-I MK-II MK-III MK-IV GULF MIRAGE J-CAR LOLA
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| | GT40 Tech - Chassis,Brakes,Tires,&Wheels Chassis and Handling. | 
08-02-07, 06:47 PM
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#1 (permalink)
| | Maily Rookie
Join Date: Jul 2007 Location: Australia
Posts: 31
Rep Power: 2  | Chassis Weight
Hi All.
I'm new to all this, and just curious as to how much the bare chassis weighs.
RCR Alloy, looks fantastic
The original chassis and Tube framed chassis.
Cheers everyone and thanks
Ray | 
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08-02-07, 06:56 PM
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#2 (permalink)
| | gt40fran Sponsoring Vendor
Join Date: Sep 2001 Location: Manufacturer of GT40: Michigan,USA
Posts: 2,661
| Re: Chassis Weight
RCR weighs a shade over 300lbs including fuel tanks...
Make sure to add the weight of the aluminum cladding and fuel tanks to any tube chassis for an apples to apples comparison....
__________________ FRAN HALL replica manufacturer.....
RCR-40..Mk1, 2 and Mk4
RCR-70 Mk3b
RCR-70 Spider
RCR-P4
Superlite Coupe
Superlite Roadster...including Electrolite
RCR917
XJ13 for SCF www.RACECARREPLICAS.COM www.superlitecars.com | |
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08-03-07, 06:54 AM
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#3 (permalink)
| | Maily Rookie
Join Date: Jul 2007 Location: Australia
Posts: 31
Rep Power: 2 | Re: Chassis Weight
Thank you Fran.............. | |
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08-03-07, 07:16 PM
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#4 (permalink)
| | gt40fran Sponsoring Vendor
Join Date: Sep 2001 Location: Manufacturer of GT40: Michigan,USA
Posts: 2,661
| Re: Chassis Weight
The original Mk1 steel chassis with steel roof ...no tanks weighs in around 385lbs ....or there abouts...
__________________ FRAN HALL replica manufacturer.....
RCR-40..Mk1, 2 and Mk4
RCR-70 Mk3b
RCR-70 Spider
RCR-P4
Superlite Coupe
Superlite Roadster...including Electrolite
RCR917
XJ13 for SCF www.RACECARREPLICAS.COM www.superlitecars.com | |
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08-03-07, 07:16 PM
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#5 (permalink)
| | Scott Calabro Supporting Vendor
Join Date: Oct 2006 Location: New England GT40: TS40 # 875
Posts: 720
Rep Power: 9 | Re: Chassis Weight
Hi Fran,
When you say a shade over 300 lbs., what is a "shade"?
If you would allow me, I'd like to take a stab at guessing your mono's weight from just a few simple deductions.
A 4x8 sheet of aluminum, depending on alloy, as far as I can tell without knowing the actual alloy, weighs on average 110-120 lbs. per sheet at the thickness you provide, (6mm/.250"). Or 3.4 - 3.75 lbs. per square foot.
So allowing for the benefit of the doubt, and without the roll bar that an RCR has to have, would mean that, using conservative figures, your mono has about 3 sheets of aluminum used in its construction, or 96 sq. ft.
Totaling 330 - 360 lbs.
The only thing I can't get my head around is how you only need 3, 4x8 sheets or 96 sq.ft. of aluminum to build a mono.
I have not included any of the extruded aluminum re-inforcements shown in pictures of the RCR mono.
Please help me to understand how an RCR tub is built.
Thanks,
Scott | |
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08-03-07, 07:20 PM
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#6 (permalink)
| | gt40fran Sponsoring Vendor
Join Date: Sep 2001 Location: Manufacturer of GT40: Michigan,USA
Posts: 2,661
| Re: Chassis Weight
Ah Scott ...
you are assuming that all the material is 6 mm ...which it is not and that 100% of all the sheet is being used....again which it is not....
Many of the guys on the forum have picked up one end of the bare chassis with me holding the other.....why the concern Scott...???
An aluminum Lola Mk3b original tub weights 115lbs......
__________________ FRAN HALL replica manufacturer.....
RCR-40..Mk1, 2 and Mk4
RCR-70 Mk3b
RCR-70 Spider
RCR-P4
Superlite Coupe
Superlite Roadster...including Electrolite
RCR917
XJ13 for SCF www.RACECARREPLICAS.COM www.superlitecars.com
Last edited by gt40fran; 08-03-07 at 07:27 PM.
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08-03-07, 07:26 PM
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#7 (permalink)
| | Scott Calabro Supporting Vendor
Join Date: Oct 2006 Location: New England GT40: TS40 # 875
Posts: 720
Rep Power: 9 | Re: Chassis Weight
No concern at all.
Just wondering.
Oh by the way, the little red tach needle below you avatar is inoperative.
Its the one that lets everyone know who's online.
Cheers,
Scott | |
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08-03-07, 07:27 PM
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#8 (permalink)
| | gt40fran Sponsoring Vendor
Join Date: Sep 2001 Location: Manufacturer of GT40: Michigan,USA
Posts: 2,661
| Re: Chassis Weight
Must have stalled when I dropped the clutch a little too quickly.....
I see it as Red....????
__________________ FRAN HALL replica manufacturer.....
RCR-40..Mk1, 2 and Mk4
RCR-70 Mk3b
RCR-70 Spider
RCR-P4
Superlite Coupe
Superlite Roadster...including Electrolite
RCR917
XJ13 for SCF www.RACECARREPLICAS.COM www.superlitecars.com | |
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08-03-07, 07:36 PM
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#9 (permalink)
| | Scott Calabro Supporting Vendor
Join Date: Oct 2006 Location: New England GT40: TS40 # 875
Posts: 720
Rep Power: 9 | Re: Chassis Weight
Good job fixing it Fran!
S | |
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08-03-07, 07:38 PM
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#10 (permalink)
| | gt40fran Sponsoring Vendor
Join Date: Sep 2001 Location: Manufacturer of GT40: Michigan,USA
Posts: 2,661
| Re: Chassis Weight
Just needed an Optima battery to keep her running.....
__________________ FRAN HALL replica manufacturer.....
RCR-40..Mk1, 2 and Mk4
RCR-70 Mk3b
RCR-70 Spider
RCR-P4
Superlite Coupe
Superlite Roadster...including Electrolite
RCR917
XJ13 for SCF www.RACECARREPLICAS.COM www.superlitecars.com | |
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08-03-07, 09:02 PM
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#11 (permalink)
| | dlindemann Rookie
Join Date: Dec 2005 Location: Minnesota, USA GT40: SLC on order!
Posts: 86
Rep Power: 3 | Re: Chassis Weight
Quote:
Originally Posted by gt40fran  Ah Scott ...
Many of the guys on the forum have picked up one end of the bare chassis with me holding the other.....why the concern Scott...???
... | I for one, can attest to the fact that the RCR chassis is VERY light. I was able to easily lift the rear of one of one with Fran lifting the front - really amazing. If only I could find someone to buy my S1 Esprit.......
Dave L | |
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08-03-07, 10:16 PM
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#12 (permalink)
| | Dlampe Silver Supporter
Join Date: Jun 2006 Location: Centralia IL GT40: RCR GT 40
Posts: 518
Rep Power: 9 | Re: Chassis Weight
Fran's answer is accurate. My chassis weight is around 307 lbs without the full cage. The cage will add about 45-50 lbs as I remember. I weighed it all. Next question! | |
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08-04-07, 03:42 AM
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#13 (permalink)
| | Andy Sheldon Sponsoring Vendor
Join Date: Oct 2001 Location: England GT40: Tornado TS40
Posts: 243
Rep Power: 10 | Re: Chassis Weight
Our spaceframe chassis requires minimal panelling.
It requires 2 x 8' X 4' sheets, 1 X 6' X 3' sheet and a floorpan all in 16 gauge to cover the required areas.
The total weight of this material is 105 lbs.
Therefore this amount of material in 1/4" would weigh approx 4 times as much which is 420lbs and there is not enough there to complete a mono chassis by far.
I am looking forward to weighing both of our monos when they are completed.
Which is heaviest. A ton of feathers or a ton of bricks?
Andy | |
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08-04-07, 05:58 AM
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#14 (permalink)
| | Russ Noble Lifetime Premier Supporter
Join Date: Jul 2004 Location: Christchurch,NZ GT40: Building scratc
Posts: 1,339
Rep Power: 20 | Re: Chassis Weight
Hell, what are we trying to build here?
1/4" plate?
We should be building a nice nimble sportscar  not a great lumbering tank!! 
Cheers
__________________ Russ
° Scratchbuild. Spaceframe Mk1 wide body. Dry sumped, forged, 351W. LSD930. 10's & 14's.
Most parts now sourced. Body 80% done. Chassis, rollcage 95% finished. Suspension 70% built. Engine starting to build, and trans in a million pieces. http://www.gt40s.com/forum/gt40-buil...atchbuilt.html | |
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08-04-07, 08:00 AM
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#15 (permalink)
| | Andy Sheldon Sponsoring Vendor
Join Date: Oct 2001 Location: England GT40: Tornado TS40
Posts: 243
Rep Power: 10 | Re: Chassis Weight
Russ
Our 40s are spaceframe based and the lightest cars available at a shade over 2000 lbs.
As a comparison a GTD weighs 2600 to 2700 lbs.
Thanks
Andy | |
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08-04-07, 09:26 AM
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#16 (permalink)
| | Brian McCarthy Bronze Supporter
Join Date: Nov 2001 Location: Up in the sticks GT40: GTD
Posts: 483
Rep Power: 11 | Re: Chassis Weight
If things continue to go well up here, we'll "soon" have some comparative data for Tornado, R.F., GTD, an original and a bottoms up scratch built car, that is provided of course the owners which to participate in such a comparison.
Of course we have to scale em without the owners sitting in them:-)
Brian
__________________
...GTD-40
...LHD-LHS
...302 Roller Block
...R-21
...BRM Pin Drive wheels
...Gulf livery | |
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08-04-07, 03:18 PM
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#17 (permalink)
| | jac mac 10 tenths
Join Date: Dec 2005 Location: Gore N.Z.
Posts: 1,384
Rep Power: 18 |  Re: Chassis Weight
Mine weighs 273 lb, but I 'know' of another thats lighter still !
Jac Mac | 
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08-04-07, 04:41 PM
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#18 (permalink)
| | IanAnderson Gold Supporter
Join Date: Nov 2003 Location: Heathrow, London, UK GT40: Dax 40 Mk1 (Rover3.9EFi)
Posts: 1,227
Rep Power: 17 | Re: Chassis Weight
No idea on the DAX chassis weight but at SVA with full tanks it was1150kg
OK with a Rover 3.9EFi and Renaut Box
Ian
__________________
Purchased a pile of bits said to be a DAX40,
Got it on the Road June 2006 (Thanks Paul)
Still tweaking EFi and getting used to driving with a grin on my face! | |
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08-04-07, 06:23 PM
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#19 (permalink)
| | wolodymyr Bronze Supporter
Join Date: Jan 2004 Location: Scotland GT40: DAX40
Posts: 457
Rep Power: 9 | Re: Chassis Weight
Based on my partially completed solidworks model of the DAX chassis, the steel spaceframe only is 230lb, one or two small bits to add, so lets say 250. I emphasise that I have yet to check some thicknesses, so the final answer could go up further. I havent added any ally floor pan or other panels yet, so these and tanks etc are not included.
Dave
__________________
DAX 302 Installing Alloy Rad | |
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08-04-07, 07:09 PM
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#20 (permalink)
| | Russ Noble Lifetime Premier Supporter
Join Date: Jul 2004 Location: Christchurch,NZ GT40: Building scratc
Posts: 1,339
Rep Power: 20 |  Re: Chassis Weight
Quote:
Originally Posted by jac mac | | |
