Vac. Wipers/ Vac. Line Source? Opinions needed!

[raleigh_bronco]

‘68 with vacuum wipers. Just completed a brand new engine installation with a Sniper fuel body that is controlled by Dura Spark ignition.

I want to understand if the best path is to:

A. tee into the brake booster vac line from the Sniper and run the existing vac wiper hose directly into the tee fitting?

B. Or run off the same tee fitting with a new line into a vacuum canister from Summit or Jeggs? Then route the wiper hose into the canister?

C. Run a new line off of the “Sniper’s 3/16” Ported Manifold Vacuum” as I do not need vacuum advanced to the Dizzy since I’m running the Duraspark timing control system.

Thanks for the advice guys.

 

[Teal68]

I don't think any of those are going to work great, but the canister solution will buy some time during varied throttle. It may not matter much if you don't drive in the rain much. Have you considered an electric vacuum pump like big cam cars need for power brakes?

 

[raleigh_bronco]

I was hoping that it wouldn’t be necessary to install a dedicated pump.

 

[DirtDonk]

…with a Sniper fuel body that is controlled by Dura Spark ignition.

C. …as I do not need vacuum advanced to the Dizzy since I’m running the Duraspark timing control system.

Don’t have an answer for you, but I’m curious about your ignition comments.
How does a Dura Spark control a Sniper, and what is a Dura Spark timing control system, if not using vacuum as part of it?
Are you saying that the timing is controlled through the sniper computer only?
Just curious how yours is set up.

Thanks.

Otherwise, I agree that the canister/reservoir is probably your best solution if you don’t want to run a secondary pump.
You definitely don’t want to tee off the brake booster.

 

[raleigh_bronco]

Don’t have an answer for you, but I’m curious about your ignition comments.
How does a Dura Spark control a Sniper, and what is a Dura Spark timing control system, if not using vacuum as part of it?
Are you saying that the timing is controlled through the sniper computer only?
Just curious how yours is set up.

Thanks.

Otherwise, I agree that the canister/reservoir is probably your best solution if you don’t want to run a secondary pump.
You definitely don’t want to tee off the brake booster.

Yes sir. From the Holley info… these HyperSpark distributors use a hall-effect crank signal sensor, providing a noise-free RPM signal to the Sniper ECU. They're an easy plug-and play solution to add timing control and complete your Sniper EFI installation.

 

[Oldtimer]

I don't think Hyper Spark is Duraspark.

 

[jamesroney]

‘68 with vacuum wipers. Just completed a brand new engine installation with a Sniper fuel body that is controlled by Dura Spark ignition.

I want to understand if the best path is to:

A. tee into the brake booster vac line from the Sniper and run the existing vac wiper hose directly into the tee fitting?

B. Or run off the same tee fitting with a new line into a vacuum canister from Summit or Jeggs? Then route the wiper hose into the canister?

C. Run a new line off of the “Sniper’s 3/16” Ported Manifold Vacuum” as I do not need vacuum advanced to the Dizzy since I’m running the Duraspark timing control system.

Thanks for the advice guys.

No one was able to solve this problem until the electric wiper motor was deployed.

The Bronco was the last to get the update to electric wipers in 1969. EVERY other platform got electric wipers. Full size cars, Mustangs, Pickups, and Vans converted earlier. As a result, the combination fuel / vacuum pump was not needed for the Small Block Ford, except in the 66-68 Bronco with the 289. The inline 6 (144/170) combination pump was used on lots of applications in the 50's.

As a result, the V8 fuel pump is rare, valuable, and inconvenient. It interferes with the standard mounting of the power steering pump.
When the wipers are running, it creates a constant and significant vacuum leak. So you want to make sure it is connected to the plenum near all of the runners. Unlike the brake booster, which uses practically no volume and can connect to a single runner.

You need to make sure that your wiper port is nowhere near your PCV connection, and not too close to your transmission modulator. Otherwise, funny things happen when you run the wipers. The best solution is to connect manifold vacuum to the outlet of your vacuum pump, and use the compound vacuum to service the wipers. This is really the only way to have wipers while going uphill at full throttle. Vacuum wipers work great going downhill.

I bought an NOS Carter 289 V8 fuel pump for my roadster. It was about $400 in 2022.

BTW, DuraSpark is not the same as HyperSpark.

 

[raleigh_bronco]

Yes. Corrected.

 

[73azbronco]

find a small vacuum pump. Jeep JK has a small vacuum pump for braking, might find a cheap used one, wire it so it only runs when needed.

 

[SteveL]

If you use the wipers often bite the bullet and go electric