fiberglass rear tub frame Q and fuel tank

[HandyAndy]

I,ve just been re reading this thread & think I now understand your suggestion Baz....

Is this what you mean?........

To have a tank sat on 3mm plates spread across the gap between RS14 & The GRP1 tube?

To remove the two D13, diagonal tubes? & extend the tank along the length of the GRP1 tube? ( width of the car )

To attach the GRP tub to the diagonal tubes ( I presume you mean D11,s) behind the suspension boxes?

To join the back brace bars of the roll bar to the top of the GRP tub support rails?

If this is your plan........By removing the 2 D13 diagonals then the only thing supporting the tank would be the 3mm steel plates (CP8,s) & the 2 spars GRP2,s & the long spar GP1, this wouldn,t in my opinion give enough vertical support to the tank.
With regard the back braces from the roll bar to the upper tub support rails......when using a GRP rear tub there is no upper support frame for the tub so the back braces from the roll bar need to go from the roll bar all the way down to the chassis base rails ( in my car a steel plate welded in between RS14 & GRP1), tho this would give the tank position in your suggestion alot more support.

If you intend to use the "Book Spec" tank dimensions, just be aware that it won,t fit when using a GRP rear tub.

Sorry for the waffle/ramble, just trying to understand your suggestion, it would work if you took the roll bar back braces all the way down to the chassis rails to a steel plate between RS14 & GRP1.

Hope I make sense?

cheers
andy

[HandyAndy]

oops, we,ve both just posted at a similar time, I must learn to type faster

Nice to hear your flat pack kit has gone together nicely, would be great to see some piccies

cheers
andy

[baz-r]

thats about the jist of it andy
i think a grp back end could be a problem as without having one sat infront of me it would be hard to tell
having a look at what other 7 reps have thair tanks held in buy (not that much) i dont think its going to be to much of a problem
also i dug out a few build dvds (other 7's) to see how thay fit them in

i plan to metal strap my tank to the back of the rear support that looks over kill to the other cars i have been looking at tho some have the diff on rubber bushings.

this reminds me i must get into drawing progs and stuff to be able to post up better info
and ply john from 3ge with more biscuits/cakes to come and take a look and see what he thinks

[3GE Components]

Originally Posted by baz-r

and ply john from 3ge with more biscuits/cakes to come and take a look and see what he thinks

Or beer, as a last resort Barry

Kind regards

John

[baz-r]

didnt think you are alowed beer john

[baz-r]

update worked out rough volume and worked out how heavy a ful tank would be

looks like it would be 45l ish and be 33kg of fuel

[baz-r]

just an update on my tank
i have started to make a tank in alloy and its working out abot 35l
its a chopped down streched version of a grp tank

my tank allows a full boot space as its the same height as the top of the diff box and now the unneeded d13's ar gone and grp frame in (2mm wall box) i have sortend my tank to 800mm so i have room at sides to get roll bar ties in and space for fuel pumps and stuff if needed

i think the grp frame would be strong enough on its own as i can jump up and down on it and its lifting the front of the frame of the build board and im 11st