I'm going to do a bike engined car & am thinking of electric reverse. If I use a mechanical handbrake caliper on the big gear for the electric reverse this gives me a transmission brake like you got on the old land rovers. (means I can use cheap light 2 pot wheel calipers). Anyone forsee legal/SVA issues?

As long as it's mechanical (i.e. not hydraulic) and is strong enough to meet the braking requirements for the "secondary braking system" then there's no reason why it should have problems at the SVA.

DJ

I hope it will work better than the old landrover ones, they were crap. Is the efficiency figure still 18% for handbrake at SVA. The MOT station wanted it to lock the wheels on the roller, I nearly had to stand up to pull the lever..

yours, Pete.

Thought about that but wouldn't this only give you one side with a handbrake on? Would have to put another one on the other driveshaft or it will turn around the braked wheel on a hill!

Would be dubious about damaging the reverse gear too. Maybe add some thin steel to the outside of the gear to protect it and another plate on the other output shaft so make it symetric.

May as well make a decent handbake on the rear discs so you can pull handbrake turns!

Just a thought.

Andy

Are you thinking of mounting the reverse gear on the propshaft or on one of the driveshafts? if its the latter then you will need two calipers, or only one wheel will be braked. If your gear is to be mounted on the sprocket adapter you may get away with it, but space will be a big issue.

wadders



i]Originally posted by Bob C
I'm going to do a bike engined car & am thinking of electric reverse. If I use a mechanical handbrake caliper on the big gear for the electric reverse this gives me a transmission brake like you got on the old land rovers. (means I can use cheap light 2 pot wheel calipers). Anyone forsee legal/SVA issues?

won't the brake on the propshaft work better witha slipper?

yeah I think you could do it either way with an LSD (never used one so am not sure). You couldn't do either with a normal diff. Wheels would still be free to turn (be it in oposite ways) so I don't thinkt he SVA would let you get away with that somehow!

Cheers for the thoughts gents. I was going to put the "extra disc" on the prop. I thought the handbrake rule was 1 in 3 hill??? I agree the old landie ones were bobbins - hope mine works better. Good points about handbrake turns (have to do donuts instead...). Re the diff allowing wheels to turn in opposite directions - the standard brake test is on rollers where the diff will give EXACTLY the same brake force to each wheel, or with an in- car accelerometer so it shouldn't be an issue (should it????)

would be interesting for handbrake turns - you'd only be able to do them in one direction i presume!

Ned.

As an aside,
The NZHRA manual specifically mentions several times that that sort of handbrake is not legal in NZ.

Not sure why though...
- Greg H