jon200
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| posted on 21/11/12 at 02:14 AM |
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Can i remove this bit of chassis?
Hey Guys,
I am changing the engine in my Locost but i think a part of the Chassis will be in the way. It is the diagonal from the front right corner of the
engine bay to the bulkhead area, sort of across the steering column.
Part R in this picture
I can probably get away with cutting the angle a little if it cant be removed? or can it be fitted to the other side?
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britishtrident
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| posted on 21/11/12 at 08:14 AM |
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No not without turning your chassis into a wobbly jelly, Chapman originally designed the Lotus Seven chasisis without it but introduced early
in the designs history because chassis were flexing and cracking.
The best solution is to replace with three smaller members forming "Y" style brace -- this can be done on both sides.
Some builders using V8 engines do remove it and weld in mirror image of the "Australian mod" short diagonal on the other side
of the engine bay.
Other solutions are move it to the other side or make it a bolt in part.
[I] What use our work, Bennet, if we cannot care for those we love? .
― From BBC TV/Amazon's Ripper Street.
[/I]
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splitrivet
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| posted on 21/11/12 at 08:58 AM |
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Ive got mine on the other side. Doesnt the book call for one on each side.
Cheers,
Bob
I used to be a Werewolf but I'm alright nowwoooooooooooooo
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loggyboy
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| posted on 21/11/12 at 09:12 AM |
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Just move it slightly?
The Striker chassis no longer has any diaganols on the upper engine bay.
Mistral Motorsport
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mark chandler
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| posted on 21/11/12 at 11:46 AM |
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Replace with a Y brace or make it removable.
Best if you can repeat on both sides, remove and 2 times Y braces, it is only on this side to suit a cross flow engine BTW
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big-vee-twin
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| posted on 21/11/12 at 11:59 AM |
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Mine has two short diagonals one either side, as the Australian mod BT refers to.
[img]
.jpg) .jpg)
Steering Column Fitted
[/img]
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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britishtrident
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| posted on 21/11/12 at 02:09 PM |
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quote:
Originally posted by big-vee-twin
Mine has two short diagonals one either side, as the Australian mod BT refers to.
[img]
Steering Column Fitted
[/img]
Yes a lot of V8 and slant engined cars are built that way but because it loads J1 and J2 away from a node it throws away a lot of
stiffness.
[I] What use our work, Bennet, if we cannot care for those we love? .
― From BBC TV/Amazon's Ripper Street.
[/I]
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jon200
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| posted on 21/11/12 at 02:50 PM |
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Good job I asked then, I will chop it out then. I will cut it in half and do a smaller triangle either side.
In has the chassis number on it, can I put it elsewhere or does it have to be a specific place?
Jon
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adithorp
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| posted on 21/11/12 at 04:00 PM |
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quote:
Originally posted by jon200
In has the chassis number on it, can I put it elsewhere or does it have to be a specific place?
Jon
Just has to be on the off-side.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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britishtrident
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| posted on 21/11/12 at 04:23 PM |
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This is the best way to do it
[img] [/img]
[I] What use our work, Bennet, if we cannot care for those we love? .
― From BBC TV/Amazon's Ripper Street.
[/I]
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jacko
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| posted on 21/11/12 at 05:24 PM |
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Engine
As you can see in this photo MK indy's don't have that part
Jacko
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sebastiaan
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| posted on 21/11/12 at 08:01 PM |
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quote:
Originally posted by jacko
As you can see in this photo MK indy's don't have that part
Jacko
Correct. I put that very diagonal in mine (as said, it did not have it as standard) and it seems to have improved handling and reduced scuttle shake.
All very subjective, I know, but I would see if you could devise some way of putting in an alternative.
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britishtrident
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| posted on 21/11/12 at 08:40 PM |
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The MK chassis is a bit on the sparse side.
Because it was designed to run small low power engines (Ford 1172cc side valve or if you were lucky an MG XPAG or even richer a 100hp
Coventry Climax) Chapman's Seven S1 chassis was even more sparse, actually to modern eyes shockingly sparse. To save both weight and
cost Chapman never added any metal that wasn't needed but very early in the production of the Lotus Seven S2 the equivalent diagonal
member was added to the frame.
A car that is stiff in torsion is much more responsive to suspension settings, relatively small changes in spring rate or damper settings will
tune oversteer/understeer to what is required, it will also be less likely to snap from one handling mode to another on a change of steering input.
[I] What use our work, Bennet, if we cannot care for those we love? .
― From BBC TV/Amazon's Ripper Street.
[/I]
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jon200
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| posted on 22/11/12 at 02:29 AM |
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quote:
Originally posted by britishtrident
This is the best way to do it
[img][/img]
I like the look of that thanks  . how would i weld in new frame work on the underside?
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Steve Hignett
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| posted on 22/11/12 at 07:05 AM |
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Some pics of modded chassis if you click the link below...
http://locostbuilders.co.uk/viewthread.php?tid=132958
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DIY Si
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| posted on 22/11/12 at 04:24 PM |
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This is how I did mine back when I was building:
 
Rescued attachment PROGRESS2.jpg
Quite a bit of extra room, but still with most of the strength retained, if not improved upon.
Welding it in is best done on all sides, as usual, but doing the return on the forward leg of the Y is quite tight. And given the length of weld
holding it in on the upper edge, it may not need it.
Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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