fbekholden.com

Good luck mate


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Thanks Bones

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Well all went well but unfortunately I failed the brake test we put the vacuum gauge on my vacuum pump and I'm getting 22" vacuum but apply the brake 4 times or so and it drops right down, apparently you are supposed to be able to apply at least 6 times and maintain vacuum.
Maybe vacuum tank is too small? I remember Harv telling me something about this so I will go back and read again.
1 step forwards 2 steps back
Neil

I have a VH151 booster, which only has a volume of 1.4L. Same drama - with marginal manifold vacuum, the electric vacuum pump couldn't keep up and I was in trouble after 2-3 brake presses. I added a Protek VT1 vacuum tank (3.1L) which solved the drama - now the pump can keep up with the stop/starts in Sydney traffic.

Cheers,
Harv

I drove past your workshop this morning , was going to drop in and see how it went but your car wasn't out the front - figured you were still at home.

That's painful Neil. Frank is being stubborn. You'll sort it out with a bit more hardware as suggested. One of the reasons Harv's wagon weighs mor n frank.
The thing is I keep seeing cars around running unboosted brakes with big hp. I can't say if these cars have been engineered but they appear to work.

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Thanks for the words and advice guys and sorry I wasn't in Blacky to make you a coffee I took the day off to do the engineer stuff and by the time he left it =wasn't worth the time to drive the 50 Km to work just to turn around and go back home

Harv; I remember this is what you said before and even though I thought the brakes were ok the engineers machine is saying I am having to apply to much pressure, he said that he felt the booster assist for the first part of the pedal push and then it get harder, my vacuum tank is also small Harv so I think I should start there, I have just had a look on ebay and can't find the Protek tank can you tell me where you got yours please.
Regards
Neil

Hoppers Stoppers
9 Nevada Ct, Hoppers Crossing VIC 3029
Phone (03) 9748 6950

Mount the tank temporarily. See if it helps, then decide where you will mount it. I put mine in the engine bay, but it is getting a little tight in there. Would probably have been smarter to tuck it up under a guard and shield the lines from rocks.

Cheers,
Harv

Hi Harv thanks for the info I will contact them.
I already have the smaller tank up under the driver side guard so will get it up under there.
I'll let you know how it goes.
Neil

Just ordered the tanks Harv thanks a lot he also suggested I hook the booster back up to the manifold with a Tee piece as well so that it will assist when the engine is actually running and stop the vac pump running all the time.
Neil

Need to think carefully about how you plumb that one. What worried me is the pump fighting the manifold vacuum, though perhaps I am wrong (?)

If you tee the vacuum line (one leg to the manifold, one leg to the pump, one leg to the booster) then this can happen:
a) the car is at idle. Butterflies shut, lots of manifold vacuum, booster is happy, pump is shut down.
b) Car is running at part or full throttle. Booster is not happy. Pump starts, but has to suck down both the booster and the manifold. The manifold is huuuuuuungryyyyyy.... the motor has an infinite ability to deplete vacuum. The poor old pump can't keep up.

The line that goes to the manifold needs a check valve. It will let the manifold suck down the booster, but if the vac pump tries to suck down the manifold then the check valve shuts.

So what you end up with is two check valves - one in the leg to the pump, and one in the leg to the manifold (i.e. you cannot rely on the single check valve that lives in the face of the booster).


Cheers,
Harv

Hi Harv
Your last diagram is how he said to connect it and your right the one time I did try to connect back to the manifold I didn't have a non return valve between the booster and the manifold just one between the pump and booster and the vac pump was just trying to suck down the manifold with no hope of doing it.
I will connect it up as he suggested and fit the larger vac tank to give me every chance of passing the brake test.
Thanks again for the advice.
Regards
Neil

Received the Protek Vacuum tank yesterday and it is pretty big so not sure if I am going to have enough room under the guard to fit it.
Am going to do as Harv suggested and temporally fit it and see if it helps, I may end up fitting it in/under the tray behind the driver, (battery on passenger side).
The way I'm set up at the moment the vacuum pressure switch is fitted to the small Vac tank that I have and it starts and stops the Vac pump, The Protek tank doesn't have a spot to fit the switch so I will either have to modify the Protek tank or it the tank goes to the tray then plumb it in series with the small tank already under the guard.

Will try this before even attempting to reconnect the inlet manifold so that I can monitor Vac pressure with the gauge fitted to the manifold line by way of a Tee Piece.

And still waiting for the Dyno guy to fit me in
Neil

A little trick: you can run the Hobbs switch by teeing into one of the vacuum lines. Saves modifying the tank.
Cheers,
Harv