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keeping a bonnet in place
ajw - 18/9/12 at 07:59 PM

I recently ad a bonnet lift off an MK Indy at the Pheonix Park races and come over the roll cage ( flat out in 6th 130mph). It wa held with 4 spring boot catchs ( same a rallly car boot)
Tried rubber sva type but no good. Has anyone got suggestion. Car used sprints and hillclimbs.
Maybe should look at vintage guys ! leather straps

40inches - 18/9/12 at 08:15 PM

Iva type rubber catches usually have provision for a locking pin? or use Dzus fasteners as a back up?
I have used Dzus fasteners on mine.
Description
Description

[Edited on 18-9-12 by 40inches]

gingerprince - 18/9/12 at 08:29 PM

No suggestions, but seems an appropriate time to dig out my old photo...

Flying Bonnet
Flying Bonnet

sdh2903 - 18/9/12 at 08:39 PM

Aerocatches for me, pricey but nice, neat and they stay locked.

adithorp - 18/9/12 at 09:14 PM

quote:
Originally posted by sdh2903
Aerocatches for me, pricey but nice, neat and they stay locked.


+1

David Jenkins - 18/9/12 at 09:28 PM

I've had no problems with the rubber latches - except when I forgot to do them up!

What I really want is some indicator to show when they're undone...

steve m - 18/9/12 at 09:32 PM

"Aerocatches for me, pricey but nice, neat and they stay locked. "

And R clipped, 12 years and never had one ping yet ...........

StevenB - 18/9/12 at 10:05 PM

I would love to fit some aerocatches
but I have doubts if they fit the MK Indy bonnet.
Particularly up near the scuttle where the curvature
appears too angled in relation to the fixing pins.

Chippy - 18/9/12 at 10:06 PM

This is what I did, couple of old snap fittings from out of date life jackets, works a treat! HTH Ray

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ashg - 18/9/12 at 10:42 PM

the rubber catches work well but you need to put pins in the chassis rails that go through the return edge of the bonnet. the issue with the rubber catches is that if the bonnet can spread out it can push them open and the bonnet flys off.

if i get 5 mins b4 i go to work tomorrow i will take a quick picture and stick it up.

rick q - 18/9/12 at 10:47 PM

Super high-tech and mega expensive [not], but a bit of folded stainless steel and an R-clip over a latch has worked for 50K on mine :-

RK - 19/9/12 at 12:43 AM

Looks good, but in the UK a midget pedestrian could get impaled and die a horrible death from those pins. I've never seen any there, but apparently the IVA people have.

rick q - 19/9/12 at 02:53 AM

My apologies - I forgot those requirements in the UK [and I thought Australia was the Nanny State!! ]

redeye - 19/9/12 at 07:17 AM

I used Dzus fasteners on mine, bit fiddly to fit, but they sit flush and are nice and small,not overly expensive either.

Never had a problem with them coming undone or loose

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Description

adithorp - 19/9/12 at 07:29 AM

quote:
Originally posted by gingerprince
No suggestions, but seems an appropriate time to dig out my old photo...

Flying Bonnet
Flying Bonnet



You really should put a picture of your elegant (not) solution to the problem up!

puma931 - 19/9/12 at 07:51 AM

I am about to fit these JJC Bonnet Boot Fastener Springs Pins Race Rally Kit Car Black | eBay which are pretty heavy duty and I would be suprised if they would fail, but I doubt I could reach 130 mph in my crossflow powered LC7. I might also modify the bonnet to avoid it flexing out.

Cheers

Mathew

JonT - 19/9/12 at 08:35 AM

My racer has the SVA rubber catches and I've had no issues...even with only three attached and travelling at prolonged speeds of 130mph on the Zandvoort circuit, which has got to be as good a test as any.

We have the bonnet sitting in a rail made of aluminium angle iron, maybe that helps keep it all in place...

Daddylonglegs - 19/9/12 at 09:08 AM

I also use Dzus fasteners, if they are good enough for aircraft, then they are good enough for my pedestrian speed Locost

I agree they are a bit fiddly to fit.

Irony - 19/9/12 at 09:54 AM

I have used the SVA rubber catches but I have not had it on the road as yet. I have noticed however that the curve of the bonnet pulls inwards and doesn't sit exactly flush on the chassis rails. I think that this could prove nasty with wind buffeting. I think I am going to get some sort of pin or bracket on the rails to keep the bonnet in place and the IVA rubber catches just hold it down.

adithorp - 19/9/12 at 10:13 AM

Has anybody tried a bracket on the underside of the front edge of the bonnet?
If it hooked under the lip of the nosecone as you put it on that'd keep it in place; Stopping the front edge from lifting even if the clips came undone and stop the wind pulling it off.

40inches - 19/9/12 at 10:51 AM

quote:
Originally posted by Irony
I have used the SVA rubber catches but I have not had it on the road as yet. I have noticed however that the curve of the bonnet pulls inwards and doesn't sit exactly flush on the chassis rails. I think that this could prove nasty with wind buffeting. I think I am going to get some sort of pin or bracket on the rails to keep the bonnet in place and the IVA rubber catches just hold it down.

My thoughts exactly. I will be fitting one of these pins adjacent to the catches. Pack of 5 Bonnet Locating Pins-KSDM38 Zero, RobinHood Catherham Westfield kitcar | eBay

ashg - 19/9/12 at 10:57 AM

sorry about the dirty car drove it over a beach on the weekend and got it covered in seaweed.

this is how mine is done. the pin locates into a hole on the return edge of the bonnet with stops it spreading out and pushing the rubber clips open there is a pin for each clip. my bonnet hasn't flown off since they were fitted two years ago and the car has done +130mph down the straights of several tracks without coming off. the big bonus is they are very easy to make and cost next to nothing.

all you need to do is riv nut into the chassis rail then get a stainless bolt saw off the head file it rounded and screw it into the riv nut, stick a little hole in the return edge of the bonnet for the pin to locate into, job done.


40inches - 19/9/12 at 11:04 AM

quote:
Originally posted by ashg
sorry about the dirty car drove it over a beach on the weekend and got it covered in seaweed.

this is how mine is done. the pin locates into a hole on the return edge of the bonnet with stops it spreading out and pushing the rubber clips open there is a pin for each clip. my bonnet hasn't flown off since they were fitted two years ago and the car has done +130mph down the straights of several tracks without coming off. the big bonus is they are very easy to make and cost next to nothing.

all you need to do is riv nut into the chassis rail then get a stainless bolt saw off the head file it rounded and screw it into the riv nut, stick a little hole in the return edge of the bonnet for the pin to locate into, job done.




That's true Locost, and just as effective Sometimes I over think things, took ages finding those pins on tinterweb, Doh!
By the way, your thumbnail doesn't match the photo. Weird!

[Edited on 19-9-12 by 40inches]

gdp66 - 19/9/12 at 11:24 AM

I used locks similar to these, and dzus fasteners.

LOCKING CAR BONNET PIN /PINS SET FLUSH LOCKING | eBay

ceebmoj - 19/9/12 at 07:30 PM

quote:
Originally posted by 40inchesPack of 5 Bonnet Locating Pins-KSDM38 Zero, RobinHood Catherham Westfield kitcar | eBay


Thanks was searching for something like that this morning on eBay. But will make my own for that price.

coozer - 20/9/12 at 12:08 AM

I used these:



From here:

http://www.protex.com/product/show/name/270-600

After my bonnet went sub orbit due to the sva rubber jobbies going soft when it was hot...

You need to buy all the bits separate as well as the R clip for double the protection