Hi I know a couple of members purchased CF bonnets or hoods, how did they do the area where you need to bolt things to the hood? That is where the hinges go and bonnet lock, curious as to how this is done. I have bought a number of books on fibreglass and CF and they don't go into a lot of detail in this area. I believe that aluminium sticks to CF but not enough info to know how to do it. Anybody out there with this knowledge.

Cheers Greg

 

I'm certainly not an expert, but I'd have excess material on the base of the aluminum to wrap the cf/aramid/fiberglass around. Basicly, make the aluminum hinge mounts an additional layer inside.

 

I'm not exactly sure what matt is saying but if he meant a little aluminum put inside the CF where the hinge area is on an all CF hood, then yes that is how i have read from the experts that they do it. I know CF reacts with certain metals (rust) so that is something to consider.

 

Hi Guys, as to the corrosion, I believe they try to coat the aluminium to try and isolate it from the CF, the idea behind this is to break the electrical current and as such stop the electrolisis. The glues stick well to aluminium though, it has something to do with the oxide that aluminium gets on it .

Cheers Greg

 

The hoods are two piece just like factory with a treaded insert ...there is little or no weight savings in the standard hand wet lay up.

 

Can anybody tell me what the rear tailgate weighs, a break up of the glass and the hatch would be great. If not the total will do. Seriously thinking about making a mould to do one in CF. If I did I would also make a sunroof, there is 5kgs to be saved in the sunroof alone and just remember how high up this weight is.

I may make others if I do this, but probably I would just sell the mould off. I don't think I will get rich by making CF parts for 928s

Cheers Greg

 

That's your ticket: a rear tailgate. without glass, they're probably 45lbs or so bare. The glass is heavy for additional anti-flex: unlike the 944 series which "walk" all over the place.

I'd buy one, but would want it to be an exact replica of the original.

 

hey greg, ive got a sunroof in cf - ultra lite and a great weight saving. mine came from tom f and he got it from someone else who i think had a few made but i dont know the details.

 

Constantine in Florida made a few liteweight roof panels.
Don't know if he has any left.
The steel panel/motor assembly delete at the highest point of the shark
probably helps lower C of G.

Ernest (NYC)

 

Yep, that was me. It took a bit of trial and error to get the mold just right and the composition of Kevlar/carbon fiber to allow ease of installation and strength. About one pound. The manufacturer was a carbon fiber airplane designer. We also used a vacuum set up to suck out the unnecassary gel during curing. Was a bit expensive though...

Cheers,
Constantine

 

Hi guys, Constantine, well done on the CF sunroofs, were they funtioning ones or replacement and then fixed? My car isn't serious enough to stop using stuff that a street car has, or is expected to have.

Mark I don't know about this, I would have thought that any tailgate was non structural, so that it wouldn't add anything to body stiffness. I will try to get my spare tailgate on the scales tommorow.
I agree with you, I would want it exactly how it is now except in CF. The thing is with the rear tailgate glass, if you replaced it with a good quality lexan one, how do you deal with the demister, I have never seen a good aftermarket one, O.K where I live I could do without it, but the wiper I find very useful, if it was lexan wouldn't it scratch real easy?

Cheers Greg

 

Just a thought, I would think that the weight on the back end of the car from the "heavy glass and metal" would be beneficial to maintain the 928s 50/50 weight distribution. If the tail gets lighter, then you loose valuble traction on the rearend; especially during hard cornering on the street. This would be most prevalent on the track. You would need to also remove a similar amount of weight on the front of the car as well to maintain the balance...If it was me, I would leave it how it is.

 

Hi Greg,

They were meant for track purposes only, although someone did put one into his street car. I did talk another lister from getting one since it did not sound like it was what he was looking for.

Constantine


[QUOTE=Greg Gray]Hi guys, Constantine, well done on the CF sunroofs, were they funtioning ones or replacement and then fixed? My car isn't serious enough to stop using stuff that a street car has, or is expected to have.

 

The hatch weight is high and substantial. Losing weight like this is very beneficial to a track car. The balance can be gotten back by corner balancing, adjusting ride heights and adjusting the suspension to dial out tail happy antics on the track. But you are correct, taking weight out of the car without care can have a negative effect on handling, especially at the limits seen on track. I've been mulling over having a hatch done, but it is an expen$ive journey...

Constantine

 

constantine, im really happy with the cf blank in place of my sunroof and so pleased you took the time to make some! my car lives on the street and im not bothered to loose the sunroof at all.

greg, the rear wiper isnt that important imo as when you drive the water clears itself. the rear demist can be taken care of via the aircon, if its working. i thought the main problem with lexan was that it would blow out at speed.