Cozza
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 posted on 11/3/04 at 05:19 PM |
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Tranny tunnell width
How wide have people made the tranny tunnel? I don't have my drivetrain yet so can't try things out, but does it need to open out much at
the front?
Cheers
Cozza
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James
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| posted on 11/3/04 at 05:31 PM |
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IIRC mine's 4".
It depends on whether you've got Live Axle or IRS like mine.
With IRS the tunnel can be narrower as the prop is stationary.
HTH,
James
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200mph
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| posted on 11/3/04 at 06:01 PM |
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arent they the same width??
the prop only moves in a vertical plane in Live axle, so it need be taller, not any wider I think
Mark
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stutz
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| posted on 11/3/04 at 07:15 PM |
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Whilst on this topic, has anyone considered running the exhaust in the spare space created by going the irs/dedion route? I am still at the stage of
designing my chassis in CAD, but like the idea of hiding the exhaust.
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Deckman001
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| posted on 11/3/04 at 07:22 PM |
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Imagine how warm that tunnel will get !! and you will have the fuel pipe/brake pipe and electrics in there as well,, could make for a nice load bang
me thinks 
Jason
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200mph
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| posted on 11/3/04 at 07:31 PM |
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I'd imagine exhaust in tranny tunnel would fail just about every test there is. Bad idea I think for the above reasons.
Put it under drivers seat to keep yerself warm
Mark
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locost_bryan
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 posted on 11/3/04 at 07:51 PM |
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Many fwd cars run the exhaust in the "tranny" tunnel - just need to have the fuel lines on the other side of the tunnel. Would pay to
heatshield the hottest part of the pipe (and the cat) to avoid hot feet! One of the US guys did this with his rotary (a Rocost?!)
Bryan Miller
Auckland NZ
Bruce McLaren - "Where's my F1 car?"
John Cooper - "In that rack of tubes, son"
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200mph
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| posted on 11/3/04 at 09:15 PM |
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fwd car with a transmission tunnel?
with a prop-shaft?
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stephen_gusterson
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| posted on 11/3/04 at 10:25 PM |
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what hes saying is most fwd car run the exhaust in the centre depression which is like a prop tunnel in the car centre.
having run my exhausts COMPLETLY under the car, I can tell you that the problem will be getting the exhaust out of the tunnel at the back. Its gotta
get past the diff, or skirt sideways. If it needs to clear the diff, or go sideways, you need about 3 - 4 ins under the car. The tube is 2 ins and you
need an inch of space from floor and a bit of clearance for any exhaust clamps. On a locost thats about 5 ins from the floor this shags your ground
clearance at the exhaust diversion point.
my car runs about 8 ins from the ground and only has about 4 ins clearance at the exhaust lowest point.
I used heat shields on mine - you could use a heat deflector / sheild in the tranny - but I dont recon it flies cos of the reasons I described
atb
steve
atb
steve
[Edited on 11/3/04 by stephen_gusterson]
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Peteff
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| posted on 11/3/04 at 11:26 PM |
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With irs cars the prop runs centrally so the tunnel can have parallel sides but with live axle cars the prop is usually offset to the drivers side
(u.k.) In the original post the question is about the front of the tunnel which will be affected more by the type of gearbox used and how far back it
is mounted than what type of axle is used. Running the exhaust down the tunnel would mean routing it under the bellhousing lessening ground clearance
and somehow getting it over the prop which would mean widening the tunnel and leaving out some bracing and sounds totally impractical in a locost type
chassis not even considering the heat problem.
yours, Pete
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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GO
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| posted on 12/3/04 at 10:31 AM |
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If you design it in from the start, say with a +2 width chassis, using that extra width in the tunnel you should be able to aviod the
routing/clearance problems described above.
But I think you would have to design this in from the start.
Definately easier with IRD/de-dion having the diff fixed.
I would be quite worried about the fuel line(s) though, especially if you want to completely box the tunnel in and cover the underside as I intend to.
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britishtrident
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| posted on 15/3/04 at 05:35 PM |
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The front section round the gearbox really depends on the box used --- a type 9 is bigger than an Escort 1300 box. My tunnel for a type 9 is more or
less as per book on the nearside but has some extra kinks on the offside to clear the type 9 5th gear case, my engine a gearbox sit as far back as
they will go . With Pinto engines some builders offset the engine towards the left by about 25mm., this give more room for the steering shaft to
pass
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On live axle the prop runs central BUT extra room must be on the driverside (rhd) to accomodate the web of the diff carrier. How much depends on the
axle used and the length of trailling arms - some builders have used 25 mm longer trailing arms., which apart from other advantages means the nose of
the diff intrudes less into the pasenger compartment.
At the narrowest point inside my tunnel is 105 mm wide with an extra 53 mm at rear bulkhead on the drivers side. --- of course the external
dimensions are 50mm wider to allow for the the 25mm RHS.
I should add my spec is CVH engine, type 9 box, MK1 Escort English axle.
[Edited on 15/3/04 by britishtrident]
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