ned
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| posted on 21/7/04 at 09:56 AM |
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Removable tube R
Having just spent the last half an hour reading through old posts on the subject of tube R nobody seems to have made them removable. I have positioned
my engine quite far back in the chassis and having not fitted all the ancillaries yet think it would make getting the engine in and out much easier if
the r tubes were removable. Something like shock mount brackets made of 3mm plate with an m12 bolt securing the r tube in place. I am thinking of
doing this on both sides of the engine to increase stiffness in the chassis as per cymtriks previous FEA.
Anyone done this already, got any pics or comments/suggestions. I am aware of the y-brace idea, but would rather have the benefit of the full r tubes
in the chassis. I want to run the exhaust out through the bonnet, so the r tube on the passenger side shouldn't get in the way here. I may have
to move or fit a small alternator anyway to clear the steering column as I know it's been an issue on some other builds using the same engine as
me.
cheers all,
Ned.
beware, I've got yellow skin
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James
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| posted on 21/7/04 at 10:10 AM |
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quote:
Originally posted by ned
think it would make getting the engine in and out much easier
I know you can't trust that GM rubbish like you can my trusty Pinto (  ) but how often do you intend to remove/replace the engine?
It's not that hard to get the engine in, whilst this seems like added hassle (not much hassle but some). Also, presumably there will be some
'give' in a bolted tube so will that reduce the benefits if having it in the first place?
Just a thought!
James
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craig1410
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| posted on 21/7/04 at 12:05 PM |
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I'd go for two Y braces if I was doing it all over again.
Cheers,
Craig.
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locoboy
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| posted on 21/7/04 at 12:48 PM |
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i remember reading a reply maybe by rorty or sid regarding removable braces and they were saying that in order to be effective they would have to be
machined to the highest standards to ensure a really tight between the bolt and the hole or the hole and a dowel. So any advantage gained by having
removable braces may be lost in torsional rigidity.
....................but im just the messenger remember!
ATB
Locoboy
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Dale
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| posted on 21/7/04 at 03:22 PM |
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I plan on trying to put in removable braces in the engine compartment as the turbo and intakes take alot of space. I figure it will have to bolted
in couple of places at each end to get a tight fit. I figure it may end up as a type of cradle over the engine.
Dale
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derf
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| posted on 21/7/04 at 03:35 PM |
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You could always have the removable tube adjustable with opposite threaded heim joints at each end, that way you can adjust the level of tension or
compression. I use them on all my suspension mount points, and It is fully adjustable.
 
Rear axle mounted
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drmike54
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| posted on 21/7/04 at 03:52 PM |
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Derf
Are those tubes locating your rear axle Swedged Steel Sleeves tubes like stock cars use? If they are what is the size and how long are they? 
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madforfishing
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| posted on 21/7/04 at 05:56 PM |
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Just for 'thinking outside of the box'...does the engine HAVE to come out through the top?
Has anyone tried removable engine mounts fixed to the chassis with hefty bolts?
That way you could support your lump and lift the front of the car up and over. Never having to remove tube 'R'. In fact put another one
in across the other diagonal.
Or am I talking b0110x?
[Edited on 21/7/04 by madforfishing]
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stephen_gusterson
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| posted on 21/7/04 at 06:02 PM |
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I can guarantee whatever one said, the other would have had the exact opposite opinion!
atb
steve
quote:
Originally posted by colmaccoll
i remember reading a reply maybe by rorty or sid regarding removable braces and they were saying that in order to be effective they would have to be
machined to the highest standards to ensure a really tight between the bolt and the hole or the hole and a dowel. So any advantage gained by having
removable braces may be lost in torsional rigidity.
....................but im just the messenger remember!
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derf
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| posted on 22/7/04 at 12:55 AM |
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actually they are from circle track dirt cars, all aluminum, 5/8" heim joints, opposite threads, the aluminum arms are 11" and the panard
rod is 36"
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locost_bryan
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| posted on 22/7/04 at 03:25 AM |
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sounds like a FWD strut brace, or the diff and trans braces that Mazda added to later MX5s to increase the torsional rigidity.
As long as it bolts rigidly, it should work. Derfs rose joint approach should work fine, or add a u-channel for the R tube to sit in at each end, and
2 bolts through the R tube and both sides of the u-channel (at each end).
Bryan Miller
Auckland NZ
Bruce McLaren - "Where's my F1 car?"
John Cooper - "In that rack of tubes, son"
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thekafer
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| posted on 22/7/04 at 03:30 AM |
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Yes! I have seen this done! On a seven noless! It was 4 years ago at an autocross a friend and I were at. At the time I was into "other"
kit cars and did'nt pay much attention to sevens. I remember them slipping a modified pallet jack under the car and three guys lifting the car
off the engine and tranny!!It only took seconds so everything must have had quick disconnects. The engine was toast so it never went back in but it
was still cool. My friend says that guy in the black seven (it's a Birkin) still races around here. I thought it was the coolest thing...
Has anyone tried removable engine mounts fixed to the chassis with hefty bolts?
That way you could support your lump and lift the front of the car up and over. Never having to remove tube 'R'. In fact put another one
in across the other diagonal.
Or am I talking b0110x?
[Edited on 21/7/04 by madforfishing]
I'd rather have a bottle in front of me than a frontal labotomy...
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Peteff
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| posted on 22/7/04 at 10:50 AM |
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I built my chassis for the pinto and found the R tube was in the way of the alternator so I fitted it to the other side of the engine bay. If I take
the alternator and engine mounts off I can lower it to the ground but it's easier to leave it connected to the gearbox and hoist it all out at
once.
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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James
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| posted on 22/7/04 at 01:21 PM |
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quote:
Originally posted by Peteff
so I fitted it to the other side of the engine bay.
Do you mean you moved the tube to the other side or the alternator?
Cheers,
James
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