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Re: [Spridgets] Double wall bulk head in Sprite.

To: <spridgets@autox.team.net>
Subject: Re: [Spridgets] Double wall bulk head in Sprite.
From: Bob Spruck <mgmaven@bellsouth.net>
Date: Mon, 06 Jun 2011 21:01:25 -0400
Lin:

That bulkhead has a vertical panel on the outside (in front of the 
diff) and an angled panel on the inside. Look at your Victoria 
British or Moss diagrams. It is there to provide two cross-chassis 
surfaces to anchor the rear of the floors to the unibody - adds much 
strength that way. So there is a wedge shaped cavity between them. If 
you do use Billy's suggestion of riv-nuts, don't drill through both 
panels (unless it is too late).

I would suggest mounting the fuel pump on the curved part of the 
trunk floor behind the diff, off to the passenger side. There is only 
one thickness of sheet metal there. I have had a Facet on my '67 
vintage racer mounted there since 1995 on the inside of the boot next 
to the fuel cell, but on my '72 street car I mounted one in the same 
place but on the outside, mostly to accommodate the external fuel 
lines from the external fuel tank on the street car and the internal 
fuel lines from the fuel cell in the boot on the race car. I would 
recommend using rubber spacers to minimize the vibration and noise 
and a separate little ground wire.

Regarding your question about a fuel cell - they are expensive, and 
you lose all storage space in the boot, including that for the spare 
tire. You don't want to mount it on the underside of the boot floor 
like the stock arrangement since they are generally thicker than the 
tank and have a top filler. Don't cut a hole in the boot floor to 
mount it half in and half out - the sheetmetal tends to crack with 
the weight and vibration. Plus you would have to get the output fuel 
line from inside the boot to outside the boot so it goes under the 
car to the front. On my racer, I have braided SS line that runs 
through the steel bulkhead and along the passenger side of the 
transmission tunnel through the right hand steering shaft hole in the 
foot box and across the steering rack to the fuel block and pressure 
regulator on the driver side inner fender.

Also , if you are going hill climbing or racing, check with the group 
you intend to race with to see if they require a fuel cell. All 
vintage race groups I have raced with for the past 20 years do, but 
if you go with NASA, EMRA, Hooked-On-Driving, etc. you may not. Are 
you going to really race or just tour around the track, do track 
days, or light schools?

Enough for now. I think that covers it.

Bob



BZ said:
Look for Pop Rivet Nuts. The 1/4 inch size is plenty strong
But use steel Riv-Nuts rather than aluminum, and use a good installation
tool...at least the ratcheting one. I don't care for the regular HF types
that look like pop riveters. They don't squeeze the steel Riv-Nuts enough to
keep them tight.
BZ
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