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Fuel Pump relay 433 906 059 16929 and Mallory Unilite Wiring
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gelos
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Joined: September 08, 2006
Posts: 70
Location: Kansas City
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PostPosted: Sat Jul 07, 2018 5:01 pm    Post subject: Re: Fuel Pump relay 433 906 059 16929 and Mallory Unilite Wiring Reply with quote

The ballast resistor is supposed to be for the Mallory distributor. Maybe itís not needed in my setup, I donít know for sure.

The other coil I have was from the engine that came with the bus. But that engine doesnít exist in any form currently.

Iím still going to give it a try when I get back in town though.

Is there any issue with the carbs I need to address?

Thanks again for everyoneís help!
Todd
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1975 vw bus,
Camper Special engine with dual Dellorto carbs.
Mallory Unilite distributer
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gelos
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Posts: 70
Location: Kansas City
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PostPosted: Thu Jul 12, 2018 3:35 pm    Post subject: Re: Fuel Pump relay 433 906 059 16929 and Mallory Unilite Wiring Reply with quote

It started! Very ugly though. I had to turn the distributor a bit to keep it from going 5000+ rpm.
I managed to keep it around 3000 rpms

I replaced the blue Bosch coil with an Accel Super Stack 8140c.
I also made sure the battery was fully charged.

Also lots of exhaust leaks

So yay! But whatís the deal with the excessive rpms? To much fuel?
The fuel pump is a Facet which I think is rated for 2-3 psi. Iíd have to check.

Any ideas?
Thanks!
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1975 vw bus,
Camper Special engine with dual Dellorto carbs.
Mallory Unilite distributer
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gelos
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PostPosted: Mon Aug 13, 2018 1:19 pm    Post subject: Re: Fuel Pump relay 433 906 059 16929 and Mallory Unilite Wiring Reply with quote

Ok, I removed the update kit from the carbs. In doing so I found a couple places where I had forgotten the o-ring when I rebuilt them. So that's got to help.

I can get it started and it will run ok for a couple minutes, then it dies and I can't start it again.

When I try to restart it the engine coughs and may catch briefly.
Eventually it's harder to turn over the engine as I assume the battery is wearing out.

When it's running the RPMs seem to bounce a bit around 1000 I think (according to my multi-meter with the inductive pickup).
It also isn't happy when I push the throttle.

Also the Facet pump is pretty loud, if that's normal I may have to do something about it.

I don't know what to do next, any ideas?
Thanks! Todd

Dual Dellorto DRLA 40 Carbs
Idle Jet - .60
Main Jet - 1.40
A/C Jet - 1.80
Pump Jet - .35
Main Venturi - 34mm
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1975 vw bus,
Camper Special engine with dual Dellorto carbs.
Mallory Unilite distributer
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SGKent Premium Member
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PostPosted: Mon Aug 13, 2018 1:59 pm    Post subject: Re: Fuel Pump relay 433 906 059 16929 and Mallory Unilite Wiring Reply with quote

once you get it running you need to balance the carbs. Make sure there are no vacuum leaks - sometimes folks get one or both carbs / manifolds slightly hung up on the tin so there is a massive vacuum leak under them.
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Godspeed to all who undertake a journey with a VW Bus.

*You can do it right the first time, or do it over, the choice is yours. It is a free country. As to brakes, steering, tires, axles etc. - you may only get one chance at doing those right.

* VW Buses and VW cars share many of the same systems but if you haven't owned a bus and maintained it for awhile, you really don't know how different it is.

Bus Engine Cooling Issues? https://kentcomputer.com/77VW/BusEngineCooling.pdf
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gelos
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PostPosted: Mon Aug 13, 2018 4:04 pm    Post subject: Re: Fuel Pump relay 433 906 059 16929 and Mallory Unilite Wiring Reply with quote

I think theyíre bolted on pretty solidly and the intake has good clearance but I will double check.

Do I need to get the idle correct before I balance the carbs?
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1975 vw bus,
Camper Special engine with dual Dellorto carbs.
Mallory Unilite distributer
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gelos
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PostPosted: Fri Sep 07, 2018 1:51 pm    Post subject: Re: Fuel Pump relay 433 906 059 16929 and Mallory Unilite Wiring Reply with quote

The engine is now idling ok and I used that snail gauge to balance both sides.

Still have a few issues:

1. #2 cylinder doesn't seem to be firing. When I remove the spark plug wire, nothing changes. Removing any of the other 3 results in the engine stumbling.

I can get spark from the spark plug.
Compression test is about 110.
I can see fuel drip into the carb throat from the pump jets when I open the throttle.
I adjusted all the valves.

2. #3 cylinder pops back through the carburetor when accelerating.

3. The left side of the engine is getting noticeably warmer.
I put cht probes on each cylinder. Connected to the head with a bolt next to the spark plug hole.

After several minutes of idling, here are the temp:
1. 257
2. 165
3. 305
4. 327

Any ideas?
Thanks, Todd
Cyl #1:
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1975 vw bus,
Camper Special engine with dual Dellorto carbs.
Mallory Unilite distributer
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Bendejo
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PostPosted: Fri Sep 07, 2018 4:06 pm    Post subject: Re: Fuel Pump relay 433 906 059 16929 and Mallory Unilite Wiring Reply with quote

I would double check firing order.
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gelos
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PostPosted: Sat Sep 08, 2018 1:51 pm    Post subject: Re: Fuel Pump relay 433 906 059 16929 and Mallory Unilite Wiring Reply with quote

Just double checked,
The firing order looks correct. 1-4-3-2
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1975 vw bus,
Camper Special engine with dual Dellorto carbs.
Mallory Unilite distributer
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