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Question Carbon fiber hood, how to support?

Hi,
I just got a new (old) car and it has a carbon fiber hood. Right now, it holds up with a stick but that's not an acceptable option for the provincial inspection (or for me). Anybody knows if it is possible to use the factory gas struts on these hoods or if it will bend it? It still uses the original hood brackets so it could be fitted. I have a set of old worn ones from my previous 911sc and I am sure they could hold the lighter weight up... just not sure if it will damage the hood.
Thanks!!
David
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1985 Black 930, K27 7006, Garretson Intercooler, Adj boost, TB: 23 - 31mm, bielstein sport shocks, ER polybronze bushings front and rear, ER monoball joints front and rear with offset camber plates, 935 X triangulated strut brace, raised spindles, racing bump steer kit
1981 Black 911sc (sold)
Old 12-16-2010, 02:48 PM
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Does the BC provincial inspection really not allow a post to hold up the hood?

Maybe a nice, integrated one like our host supplies would suffice although I had a CF hood with gas strut once, worked fine.
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Old 12-16-2010, 02:57 PM
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Old 12-16-2010, 03:01 PM
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+1 on the ultimate strut linked above.

I can't see how the provincial inspection would care how the hood was held up. If in doubt, until you get your replacement holder-upper device, just remove the stick. I wouldn't use the gas struts, though. I have heard that they might cause the hood to buckle when closing it - pressure on the front pushing it down and pressure from the strut in back pushing it open. Or maybe it's a load or baloney. Just heard is all...
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Old 12-16-2010, 03:18 PM
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if i recall the strut fastens to the hinge, double em up with one on each side. carbon fiber is suppose to be all stong i thought?
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Old 12-16-2010, 03:39 PM
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Yeah, it fastens to the hinge, but I guess the idea is that if the hinge resists going down, and the hood is attached to that, it's a lot of leverage when you're pushing on the other end of the hood. There's also a fair amount of pressure with the struts - they hold up the entire weight of the metal hood.

I know that a CF hood is pretty stiff/strong, but it's still a big, flat, thin piece of Carbon fibre. Is it strong enough, though? What I heard may have been referring to a fibreglass hood, as well. It could also be a myth. The gas units would likely work just fine, though I wouldn't use 'em.

Just get the manual arm that like the ultimate strut - simple, works fine and doesn't need replacement every couple years...
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I might have to do that. They allow a strut to hold it but they want something to be "fitted" to the car... a piece of wood bolted to the side would probably work but if it lays in the trunk, it may not...
The only thing I don't like about having something holding the CF hood on 1 side only is that it looks all crooked as the transversal strenght is not very good...
Thanks again
David
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1985 Black 930, K27 7006, Garretson Intercooler, Adj boost, TB: 23 - 31mm, bielstein sport shocks, ER polybronze bushings front and rear, ER monoball joints front and rear with offset camber plates, 935 X triangulated strut brace, raised spindles, racing bump steer kit
1981 Black 911sc (sold)

Last edited by Roby466; 12-17-2010 at 04:25 AM..
Old 12-16-2010, 07:36 PM
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Factory used a prop rod on the RSR's
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Old 12-17-2010, 05:44 AM
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If you REALLY want to have the gas struts hold up the hood, you can use lesser-duty gas struts.

McMaster-Carr

You just have to figure out how much load and pick the size of the eyelets you need. I did this (unsuccessfully) on my racecar with steel hood that wouldn't stay up because of the original struts being worn out. I said forget it when I kept picking struts that didn't have enough load capacity to hold up the hood. So I just took the struts from my working '87 street car........
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Old 12-17-2010, 06:33 AM
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My hood is fiberglass. I use a simple carbon fiber hood prop which I made. Similar to the 964/993 aluminum rod used on factory race cars.

I have made several of these for friends as well. I may have one left in my shop.
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Old 12-17-2010, 09:19 AM
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I use stock struts on my CF longhood without any trouble.
My trick is to use old "worn out" struts. They work for my CF hood but not for the original steel.
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Old 12-17-2010, 10:14 AM
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On my fiberglass hood I didn't want to use the functional, fresh gas struts, so my prop rod has been a length of M6 threaded rod with a rubber cap on the hood end, and a rod end/ spherical monoball joint bolted to the trunk wall. Cost me about $10 from my aforementioned favorite industrial supply place.
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Old 12-17-2010, 11:13 AM
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Quote:
Originally Posted by syzygy View Post

I can't see how the provincial inspection would care how the hood was held up..
Maybe they think the engine is up there and they don't want the hood falling on your head when you are checking the oil
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Old 12-17-2010, 12:04 PM
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Look at almost every Honda, there is a prop-rod on there hoods.
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Old 12-17-2010, 12:09 PM
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I have a set of worn out hood shocks that could not hold my SC's hood... I might give that a try for a quick inspection pass...
Mahler9th, I would definitely like your CF prop option... that seems like a better idea in the long run...
David
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1985 Black 930, K27 7006, Garretson Intercooler, Adj boost, TB: 23 - 31mm, bielstein sport shocks, ER polybronze bushings front and rear, ER monoball joints front and rear with offset camber plates, 935 X triangulated strut brace, raised spindles, racing bump steer kit
1981 Black 911sc (sold)
Old 12-17-2010, 07:46 PM
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Quote:
Originally Posted by equality72521 View Post
I have one of these and they work great. Very lightweight too. Looks very cool and gives it that bare bones sports car look.
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Old 12-17-2010, 07:52 PM
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Correct. If using gas struts with a CF hood, trying to close the hood may/will cause the material to fatigue and crack, now or eventually. YMMV.

Here's the CF Ultimate Strut supporting a CF hood on a POC street/track 911:



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Old 12-17-2010, 09:55 PM
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If you need cheap hood supports....try tent posts....they are fiberglass or carbon fiber....cheap...come in all sorts of lengths...and have plastic end already on them.
Bob
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Old 12-18-2010, 09:33 AM
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How the factory did it.
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Old 12-18-2010, 06:50 PM
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If you use gas struts, you coil always try initially closing the hood by pushing further down the hood, closer to where the hinges attach to the hood to lessen the stress put on the hood when closing.

When it first latches on the safety latch, then move around and finish the job.

But I know that's a bit of extra work. Dunno if it's worth it.

Michael
Old 12-18-2010, 08:46 PM
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Old 12-18-2010, 08:46 PM
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