[tanshi]

OK, im looking into the possibilities of running boosted brakes on the LJ50.

Im currently hunting around for an electric vacuum pump to run the booster as the 2 stroke wont have enough manifold vacuum to run a booster.

My question is this. how much vacuum is needed to run a sierra booster?

Does any one have any sources of vacuum pumps that i might be able to pick up cheep.

[BlueSuzy]

The only thing i can think of is the vac pumps on the diesel altenators.

[royce]

20in.hg should be plenty

[tanshi]

i assume its possible to have too much vacuum?

[royce]

I guess eventually the booster might crumple

[BlueSuzy]

Do you recon a Baleno motor will suck enough for a 60' cruiser booster? (Not sure on technical air volumes )

[royce]

yeah, vacuum isnt really a measure of flow
an extra tank and check valve will cover it well enough either way

[shep]

i have a alternator with vac pump on it if anyone wants to try it out. actually the dump is full of them.

[tanshi]

electronic will be best for the 50 i reckon so it doesnt have to turn the extra alt

thoughts on something like this?

http://www.ebay.com.au/itm/Cummins-Dies ... 35b0e7c90e

[BlueSuzy]

Ok i will look into it more.

Mate runs a lux vac pump with 80'cruiser booster and master in his lux. 80' diffs, He can run out of brakes and the light comes on on the dash with a few pumps of the brake.. He thinks it might be the smaller pump, But could be another problem..

[royce]

idling or driving?
you can make a lot of carby engines die pumping the pedal at idle too

[tanshi]

or maybe this

http://cgi.ebay.com/ebaymotors/electric ... 35b2cae733

[BlueSuzy]

royce wrote:

idling or driving?
you can make a lot of carby engines die pumping the pedal at idle too

2.8td driving
Should sort itself out with the 5Lv8 he wants to put in it

Sorry Tanshi.

[shep]

tanshi wrote:

or maybe this

http://cgi.ebay.com/ebaymotors/electric ... 35b2cae733

would it need a accumulator as well?

[tanshi]

shep wrote:

tanshi wrote:

or maybe this

http://cgi.ebay.com/ebaymotors/electric ... 35b2cae733

would it need a accumulator as well?

Not sure, whats one do?



all good blue, it was related tech.

[shep]

it is like a air tank for a vacuum. most diesels have one.

if bluesuzys mate removed the accumulator when he fitted the 60series
booster then that will be what is causing his issue

[tanshi]

shep wrote:

it is like a air tank for a vacuum. most diesels have one.

if bluesuzys mate removed the accumulator when he fitted the 60series
booster then that will be what is causing his issue

So its a vacuum tank to keep the vacuum constant? when braking multiple times. Got it

[tanshi]

Cruise control Vacuum accumulator tank - For use in cruise installations where the vacuum source varies or is weak.

So some thing like this would probably work.

[shep]

you are in brisbane ? i can drop one off for ya in a fortnight. mitsubishi have
tough plastic ones that make there front diffs work.

[tanshi]

yeah im in brisbane.

That sounds great, PM me

[303zuke]

tanshi wrote:

OK, im looking into the possibilities of running boosted brakes on the LJ50.

My question is this. how much vacuum is needed to run a sierra booster?

Another problem with the LJ50 (you might have already spotted this) is the location of the brake pedal. It is very close in the engine bay to the inner guard, with it's vertical square corner. Unless you plan to re-arrange the pedals to Acc-Clutch-Brake, or even using an LJ80 inner guard, which is cut away, it doesn't give much clearance from the centreline of the pedal to clear a 190mm brake booster (Sierra). You can cut away and box the guard and relocate the oiltank, but you lose support for the guard on the firewall. One option is to use a Swift booster at 160mm, which although has a smaller diaphragm surface area and therefore less brake assistance, still provides enough for a small LJ. The Swift booster will still require slight clearancing on an LJ50 guard, but not on an LJ80.

You can use the Swift booster with either the Swift Master Cylinder or the Sierra one, both are set up for Disc fronts. The Swift M/C has the line outlets on the R side, so a bit of plumbing work might be in order.

Both Boosters will still require the same amount of vacuum to function.

[tanshi]

thanks 303,

i gonsidered just running a larger master cyl, un boosted so we will see what comes of it

[sstteevvee]

Hey mate, not sure if you've come across this but thought i'd link it anyway. Pays to read through it though coz theres some things to look out for which are mentioned right at the end of the write up

http://www.lj10.com/howto/discbrakes/

[ajsr]

your 2 stroke should have shit loads of vacuum for a booster.
what about a remote booster like HR holdens and the like used
http://www.ebay.com.au/itm/HOLDEN-EH-HR ... 2c5d511470

[sstteevvee]

Hey mate, not sure if you've come across this but thought i'd link it anyway. Pays to read through it though coz theres some things to look out for which are mentioned right at the end of the write up

http://www.lj10.com/howto/discbrakes/

[shep]

tanshi wrote:

yeah im in brisbane.

That sounds great, PM me

got ya a hzj75 accumulator pm me ya phone number and i will give ya a call when i get to QLD