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Learning how to build Lotus Seven replicas...together!
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PostPosted: Thu May 12, 2011 11:39 am 
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Joined: Wed Apr 15, 2009 7:41 pm
Posts: 527
What is the best place to run fuel lines from the rear of the car to the front? Same for battery cable (rear mounted battery).

The 3 choices to me seem to be in the tunnel, under the floor, or through the passenger compartment....all of which have potential issues.

If in the trans tunnel, how do you shield it from a drive shaft failure?


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PostPosted: Thu May 12, 2011 12:26 pm 
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Location: White Rock, BC, Canada
Yeah, there is no perfect location (other than in an armoured casing... but not with the electrical in the same one :mrgreen: ).

In most of our cars there is not enough power/traction to break driveline parts so I would say the tunnel is the best bet. Just a driveshaft loop, and good quality shaft and u-joints is what most people feel best. You could weld a thick tube inside the tunnel, and then run the fuel lines through it if you are concerned.

On a drag car where driveline failures are likely I wouldn't pick the tunnel. But on a lightweight sports car (where crashing or bottoming out are more likely) the tunnel seems safest.

Cheers.
Cory

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PostPosted: Fri May 13, 2011 9:58 am 
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This definetly won't be a drag car, but if it handles well, I could see it getting abused.

Anybody have neat ideas for conduit or shielding?


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PostPosted: Fri May 13, 2011 10:30 am 
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Joined: Wed Mar 30, 2011 7:18 am
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Location: central Arkansas
I've used conduit to armor fuel lines. I've seen track debris snag a line a couple of times.

My plan for the RX7 I recently sold was to run conduit through the passenger compartment, welded at the firewall and rear bulkhead.

Topologically, the inside of the conduit is "outside" the passenger compartment, like the hole in a doughnut. Running the fuel lines through there would move them above the floor pan, where they would be less vulnerable, while keeping them outside, since some sanctioning bodies prohibit fuel lines in the passenger compartment.

I think I picked up the idea from some of the dirt track guys.


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PostPosted: Fri May 27, 2011 12:14 pm 
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Joined: Tue Sep 05, 2006 11:00 pm
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Location: Columbia SC
I like the tunnel and you can armor it too. Fuel down low, electrical up high in the corners. I saw a fuel line get split by a driveshaft failure ( I warned my friend that
his driveshaft wasn't properly engineered) and sure enough it broke the back of
the trans apart at 70mph.. Luckily nobody was hurt but the center tunnel had to be
fixed. This was a Locost with a Volvo B20 but he isn't on the forum.

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PostPosted: Fri Jul 22, 2011 4:52 am 
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Joined: Sat Apr 16, 2011 11:05 pm
Posts: 237
Location: Melbourne, Australia.
I don't think you really need to especially protect fuel lines, or wiring, as long as it is not the lowest thing on the chassis, or within cooking distance of the exhaust.

In the event of a serious accident, I would rather have anything that may burn or suddenly burst into flames OUTSIDE of the passenger compartment.

So I run everything under the floor pan, maybe onto the side (or through) a main structural chassis rail.


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