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Glad you didn't suffer worse injury. I'm a bit incredulous when I watch custom car TV shows, and, without fail, they install seats with no headrest. I understand these high dollar cars are not being raced (despite having ungodly power under the hood), but shit happens... Regarding helmets, I...

that looks pretty close to a Tri-Y, so I guess it does fit.

The upper link doesn't experience nearly the load/stress that the lower link does. Provided the equipment is maintained, your pic does not show a weak point.

If fabrication of bundle is too onerous, is there room to do a Tri-Y? Thinking about it, probably not.

Understood and agree. I raised the point to argue that a cantilever structure should be able to support a significant load in case one backs the car into a barrier, to help prevent whiplash etc.

regarding this system, does it rely on reluctors at all 4 wheels, or will two reluctors on rear axle suffice?

Hope I'm not derailing with this comment, but has anyone ever run an electronic throttle actuator on a Borla or such? I know it's a different beast, but I recently changed my ECU to a DBW set up and had to convert my mechanical throttle pedal. Did some measuring, drilled some holes, and made a...

re my point on helper spring, it should be 1) tangent to the bell crank at idle ie 90 degrees so that it is at maximum efficiency 2) a "light" spring rate relatively speaking 3) anchor point stretched pretty far, so that there is significant preload at idle. As bell crank sweeps through range...

As I recall, about 7G is the threshold for jet pilots to start blacking out, so 10G doesn't seem like a huge number to design around. Instead of doing a cantilever, is it possible to tie into the roll hoop with a flat plate like I did above? That way, the anchors serve to support the plate...

is the spring a clock wound one, or standard coil spring? If coil, maybe adjust the anchor location, both distance from the bell crank, and angle, to increase the closing force at idle, and perhaps lighten the spring force further into the bell crank rotation.

I don't have one of these, so take this idea with a grain of salt. If you have isolated the stiction to the intake/TBs, try isolating one TB from the rest of the linkage to see if one in particular is sticking. If they are daisy-chained, start by removing last in the chain, and work towards...

thanks for your reply. revised thinking is to build a few head rests with different thickness than I can swap out in about 5 minutes - going to the track, install the thinner one. Your point about the bike helmet is exactly what I was thinking, it's the material they install in Snell helmets...

Gents, I'm working on my headrests for my car, with two concerns: 1) keeping heads away from the roll hoop 2) providing enough room front to back when bare headed, or wearing a helmet. The backer plate/support is about 3 1/2 inches behind the seat back. Current thinking is to bond 2 inches of...

absolutely stunned at the level of fabrication in this build. Wow.

Hi Randy, I disagree - there's no good load path front to back on either corner of the windshield. the spider serves to stop the entire windshield hinging back at the base under a controlled and distributed load (wind). The strength the bonded-in glass provides is transverse/shear for the...

Don't know how you would create a windshield support structure that wouldn't be prone to bending back towards the occupants in a wreck. This is the primary issue with the GT40 cages to begin with - no direct support from windshield header to roll hoop, because of door shape. Safer bet is...

something like this perhaps? https://xtremehelmets.com/hci-105-polo-style-half-helmet-carbon-fiber/

had a further think on this - using remote reservoirs, mounted higher than the MC and calipers, should reduce or eliminate the issue, along with no fitting issues.

Is anybody aware of a way to incorporate a residual pressure valve between the MC and banjo fitting? My calipers are slightly higher than the MC, and are plumbed with soft lines and banjo fittings. Only way I can fit an in-line RPV is at the caliper, or, for the rear circuit, all the way at the...

^ so that got me started with a new search - https://www.motorsportmagazine.com/archive/article/january-2018/80/lunch-hugh-dibley Good article which mentions two blow overs at St Jovite