Bonnet hinge mod- thoughts

[Top Gear TVR]

Any thoughts on this? Other than learn to draw!

[magpies]

drawing needs more info

I presume the new steelwork fits into the existing unmodified chassis box section and is bolted into position.

Also the new steelwork requires some method of up/down and L/R adjustment.

The drawing needs dimensions.

[phillpot]

Hi Steve, I think that may put the new pivot too low? Maybe kind off invert yours so it comes off the top not the bottom?

A quick look at mine and the pivot is now approx 200mm forward of the existing chassis bracket and slightly higher than the top of that bracket.

As Mick says build in as much adjustment, in every plane, as you can.... up/down.... forward/backwards.... sideways




ETA ...........

...

Edited by phillpot on Friday 1st January 13:28

[Alan461]

That looks like it would work, the fulcrum needs to be around 180mm forward of the original.
The existing brackets can be used if moved to the inside of the bonnet panels and mounted vertical to give required adjustment. Not a great photo but you get the idea.

[magpies]

although I welded and beefed up where the new extension fits to the existing chassis, it could have been bolted to the original slotted box.

The new pivot is about 20mm lower and 200mm forward of the original

[Top Gear TVR]

Ok. Version 2 is a bit of 1/8" sheet steel bent to create an angle. It's approx 9" long with one side 3"in height, the horizontal approx 1 1/4 wide. This has two pieces of sheet welded to it to snug fit the existing chassis hinge mount when the angle is placed over it. Simpler and cheaper to make.

I might try this method...

[phillpot]

I'd "rough it up" from just flat sheet first off, then when you're sure of hole positions (chances are you'll need to move them once or twice) set about making again with any excess metal removed and your various strengthening ribs/braces added where required.

Do they need the strip at the back "A" ? If the holes are positioned correctly strip "B" should stop the bracket tilting down

Edited by phillpot on Friday 1st January 16:38

[Top Gear TVR]

Philpott- you may be right, I fancied the two pieces to fit snugly over the chassis - with a view to them being able to stop rotation. My only other thought is that this puts the bracket further away from the bonnet webs, increasing leverage on the pivot? I like this design though. It's easier to make...I guess I could add a piece of box section to close the gap ? I recon I might still need to trim the bonnet though.

[phillpot]

Top Gear TVR said:

I recon I might still need to trim the bonnet though.

I don't see that it can be done without a "little" surgery on the bonnet valance?

[Top Gear TVR]

Can't decide whether I prefer the SHS top entry model or angle for dangle version?

[tel595]

Did you see my attempt Steve? The only snag with this method is the difficult forward and back adjustment. If I did it again I'd possibly use a two way threaded stud (left hand and right hand threaded) connecting the bracket and the rose joint. I can't see a way of fitting the hinge pivot further forward without removing part of the under valance though..

[Top Gear TVR]

thats simple enough

[magpies]

Yeah that's the simple one that I'd do if I needed to again - I'd keep a close eye on the original box for distortion taking the bonnet out of alignment and beef up if/when required.

[AutoAndy]

Yea...but...what if it looks cool to have it at as TVR did it....and limit the opening ....it does look cool.....ignore practicality...

[Top Gear TVR]

My efforts are here: http://www.pistonheads.com/gassing/topic.asp?h=0&a...