Thinking about fitting aero catches to secure bonnet but am concerned that drilling 10mm holes through the top members ( to fit pins ) in two places may affect the strength of the chassis..

any thoughts...?

Its a luego viento chassis.
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side view
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I wouldnt worry about it if I were you. The loads in the chassis arent that high for you to worry about a couple of 10mm holes....

IMO any, no doubt someone will disagree.

David

IMHO I would drill a hole and weld a tube through it. Then attach the pin. A 10 mm hole in a 25 mm tube is a lot. Or maybe attach a bracket on the Side of the tube to attach the pin.

You've got me worried now - I've almost finished my build and have put a few holes of that size in the chassis for rivnuts, I thought this would be fine but after hearing this will it cause problems?

Paul

quote:

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Originally posted by drmike54
IMHO I would drill a hole and weld a tube through it. Then attach the pin. A 10 mm hole in a 25 mm tube is a lot. Or maybe attach a bracket on the Side of the tube to attach the pin.

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quote:

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Originally posted by drmike54
IMHO I would drill a hole and weld a tube through it. Then attach the pin. A 10 mm hole in a 25 mm tube is a lot. Or maybe attach a bracket on the Side of the tube to attach the pin.

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make a tophat bracket in alloy to rivet on 4 x 5mm rivets then fix the pin through this as below, bracket shown needs rotating 90 degrees ( apologies for the crap photoshop effort )

yes you are dilling four holes but they are only 5mm and are only on one side of the box

this is how we are fitting them

best regards

marc

[Edited on 26/10/05 by marc n]

[Edited on 26/10/05 by marc n]

oops forgot picture
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Cheers Mark ,

That was one of the ideas I was thinking about and will I go along the lines of making a bracket and riveting it down. This will also allow me to play around with the alignment before final fixing.

Paul

Marc's bracket is a good option if you've got room (which obviously there is, as Marc's doing it that way), but the bracket could fracture if there's much vibration or distortion of the bodywork at high speeds.
Welding in a crush tube is a 110% job, but whatever you do, don't just make holes that size in the chassis without some sort of closure.

agree with rorty the crush tube is the way to go if you arent powdercoated, but if you are powdercoated next best option is the bracket you could make from m/s and gusset if fatigue is a worry

best regards

marc

Made from 25mm steel tube - will either riviet or rivnut to chassis
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Very long "wings" on it, but nicely executed. Well done.