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PostPosted: March 18, 2017, 9:04 am 
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Joined: September 20, 2011, 7:21 am
Posts: 78
I have download the plans of book chassis & 442E in sevenesque, but it didn't give the size of the center tunnel which hold the gearbox & driveshaft, where can I find it?
http://sevenesque.com/plans/


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PostPosted: March 18, 2017, 12:21 pm 
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Joined: December 17, 2010, 1:24 pm
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Location: Gainesville, Mo.
Tunnel design is mainly dependent on your drive train. The tunnel needs to be tall & wide enough to house the tranny and drive shaft, but narrow enough to not encroach on the already limited passenger space of the cockpit.

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PostPosted: March 18, 2017, 12:32 pm 
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Joined: April 22, 2010, 4:43 pm
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Location: Livermore, Calif.
Decide on how wide your bucket seats or seat bottoms will be and the rest will be for the tunnel.

I hate to say it but it may really come down to how wide your "backside" is.

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PostPosted: March 18, 2017, 2:13 pm 
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Joined: July 4, 2006, 5:40 pm
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Location: Novato, CA
Around 5" is typical, but as stated it's really up to you. With a 442 you have a little more leeway, but I wouldn't make itl any wider than what you need for the driveshaft, handbrake, and any wires or tubing to run through the there.


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PostPosted: March 18, 2017, 3:24 pm 
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Joined: December 4, 2010, 1:53 pm
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Location: Edmonton, Alberta, Canada
Keep in mind that the tunnel is not necessarily centered. Since my driveshaft is offset at the diff to the passenger side, I offset the tunnel to match. This gives a little extra room in the driver's footwell, which is crucial.
cheers
Doug

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PostPosted: March 18, 2017, 4:26 pm 
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Joined: May 27, 2006, 9:46 pm
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Location: BC, Canada. eh?
As others have mentioned, seats are typically an issue, as most available bucket seats are 21" wide (ask me how I know - and my driver's side seating area is only 13" wide at the back!). Be sure to take that into consideration. There are some (a VERY few) narrower seats available, but they tend to be rare & expensive. Making the tunnel width unnecessarily "generous" will create a problem that will be hard to fix down the road.

Basically, I'd recommend making it as narrow as humanly possible while still allowing room for the driveshaft, brake & fuel plumbing, and wiring.

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PostPosted: March 18, 2017, 8:52 pm 
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Joined: October 24, 2008, 2:13 pm
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Location: Carlsbad, California, USA
KinFung wrote:
I have download the plans of book chassis & 442E in sevenesque, but it didn't give the size of the center tunnel which hold the gearbox & driveshaft, where can I find it?
http://sevenesque.com/plans/


I downloaded the 3D files for those designs (also on his website) 2-3 years ago and I don't remember what format McSorely saved them in. However, I'm pretty close to positive I loaded them up in the free Dassault Systemes viewer, E-Drawings. When the file is loaded in E-Drawings, you can use the measuring tool in it to measure between surfaces, points, lines, planes, etc. It will tell you what the initial dimensions of the tunnel are in his layout. However, as advised here, the tunnel size you actually need may be determined by the donor components you elect to use in your build.

Free E-Drawings download here ==> http://www.edrawings.com/

Cheers,

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Build Log: viewtopic.php?f=35&t=5886


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PostPosted: March 18, 2017, 10:00 pm 
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Joined: January 31, 2012, 12:49 pm
Posts: 1431
Location: Louisville KY
The plans for my tunnel called for 8" outside of tube to outside of tube, which meant giving up 8" for 6" of space for the 3" drive shaft.

This didn't make sense to me, so the top tubes on my tunnel are 1/2" tubes, 4" outside to outside, giving me 4" of interior space once I wrap the sheet metal around it. My idea is to form the sheet metal on the tunnel to accommodate the space requirements. If this doesn't work I can always just move those top tunnel tubes, but right now I like the idea of 4" more of butt space.

Attachment:
Tunnel tube closeup.jpg
Tunnel tube closeup.jpg [ 155.97 KiB | Viewed 607 times ]

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