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Claydoh
Samba Member
Joined: August 10, 2018
Posts: 5
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 Posted: Sat Sep 22, 2018 4:39 pm Post subject: Newly built 1776 engine idles rough |
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Newly built 1776 engine. I’m experiencing an issue with rust within my fuel system. I’ve been banging my carb to get it running when it pitter patters out.
But I took it on the highway and after it’s been idling at a higher rpm. (Noticeably louder)But it drives alright other than the occasional rust blockage.
Also I’m in 15-20 degree hotter temps than normal
If anyone could let me know the order they recommend checking things in.
I’m a novice thanks |
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AlmostHeavenWV_VW 
Samba Member
Joined: October 12, 2017
Posts: 1966
Location: WV
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| Posted: Sat Sep 22, 2018 4:45 pm Post subject: Re: Newly built 1776 engine idles rough |
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Let's start with basics:
Type and brand of carb?
Type and brand of distributor?
What's the timing set to?
What's the idle RPM readout on the tachometer?
A pic of the engine would be helpful too.
Also as an aside, if you have a known rust problem in the fuel system- you need to address that properly. Time to pull the tank, change filters, blow out metal lines with air, and replace metal and rubber lines as necessary.
_________________
1973 Standard Beetle
1600DP AK case
Solex 34PICT3 Carb
Bosch DVDA 205AJ Distributor |
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VW_Jimbo
Samba Member
Joined: May 22, 2016
Posts: 9967
Location: Huntington Beach, CA
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| Posted: Sat Sep 22, 2018 11:13 pm Post subject: Re: Newly built 1776 engine idles rough |
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The rust is probably coming from the fuel tank. Why dont you replace the fuel tank or recoat it with the POR15 gas tank sealer. You will need to flush the gas line out as well.
Be careful working on gas tanks. No heat sources and no sparks.
_________________
Jimbo
There is never enough time to do it right the first time, but all the time necessary the second time!
| TDCTDI wrote: |
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| 67rustavenger wrote: |
GFY's Xevin and VW_Jimbo!  |
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Claydoh
Samba Member
Joined: August 10, 2018
Posts: 5
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| Posted: Sun Sep 23, 2018 12:48 pm Post subject: Re: Newly built 1776 engine idles rough |
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I’ve already replaced the fuel tank the fuel filter and some of the line. I think the carb is just contaminated. It was taken apart and blown out but still occasional hiccup. Seems to happen after I fuel up usually.
I don’t have a tach.
I will take some pictures to post shortly. |
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AlmostHeavenWV_VW
Samba Member
Joined: October 12, 2017
Posts: 1966
Location: WV
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| Posted: Sun Sep 23, 2018 1:34 pm Post subject: Re: Newly built 1776 engine idles rough |
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| Claydoh wrote: |
I’ve already replaced the fuel tank the fuel filter and some of the line. I think the carb is just contaminated. It was taken apart and blown out but still occasional hiccup. Seems to happen after I fuel up usually.
I don’t have a tach.
I will take some pictures to post shortly. |
Again, what carb and distributor?
What is your timing set to?
Valve lash?
---These settings are critical to proper idle and running characteristics.
-The particular set up (carb and distributor) you have may be a 'mismatched' pair or a carb or distributor with a bad rep for poor running characteristics.
And you need to get a tach to hook up so you can set the idle appropriately in the 800-950 RPM range at warmed up idle.
Most timing lights can also have be timing/tach/dwell/voltmeter combos.
Or you may opt to have separate tools for each of those tasks.
Such as these:
https://www.amazon.com/ESI-585K-Deluxe-Automotive-...automotive
https://www.amazon.com/INNOVA-3568-Digital-Timing-...&psc=1
https://www.amazon.com/INNOVA-3568-Digital-Timing-...t&th=1
https://www.amazon.com/INNOVA-3568-Digital-Timing-...t&th=1
_________________
1973 Standard Beetle
1600DP AK case
Solex 34PICT3 Carb
Bosch DVDA 205AJ Distributor |
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DurocShark
Samba Member
Joined: April 05, 2004
Posts: 6624
Location: Crappy town in a crappy state. But the beach is nearby, so I have that going for me.
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| Posted: Sun Sep 23, 2018 1:38 pm Post subject: Re: Newly built 1776 engine idles rough |
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You could also have rubber from deteriorating hoses in the system. This was inside the carbs of my 73 Bus:
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No boom today. Boom tomorrow. There's always a boom tomorrow. |
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Claydoh
Samba Member
Joined: August 10, 2018
Posts: 5
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| Posted: Sun Sep 23, 2018 1:50 pm Post subject: Re: Newly built 1776 engine idles rough |
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Claydoh
Samba Member
Joined: August 10, 2018
Posts: 5
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| Posted: Sun Sep 23, 2018 2:19 pm Post subject: Re: Newly built 1776 engine idles rough |
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| Quote: |
Again, what carb and distributor?
What is your timing set to?
Valve lash?
And you need to get a tach to hook up so you can set the idle appropriately in the 800-950 RPM range at warmed up idle. |
I don’t know the timing or the valve lash.
I posted pictures of carb and distributor
I have a 34 pict 3 carb
I plan to get a tach I just haven’t figured out which one and where I wanna mount it |
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AlmostHeavenWV_VW
Samba Member
Joined: October 12, 2017
Posts: 1966
Location: WV
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| Posted: Sun Sep 23, 2018 2:37 pm Post subject: Re: Newly built 1776 engine idles rough |
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| Claydoh wrote: |
I plan to get a tach I just haven’t figured out which one and where I wanna mount it |
I'm sorry, I wasn't clear- that is my fault. I meant the tool (handheld) tachometer. Not a gauge on your dash, for diagnostic/troubleshooting purposes you will need to tool, not the gauge.
If you don't know the valve lash, you'll need to check that. Need a 'feeler gauge' for that.
Like this set:
https://www.amazon.com/OEMTOOLS-25025-Blade-Master-Feeler/dp/B000BYGIR4
Also, if you don't have any manuals for your bug follow this link to see some good manuals/resources to have when working on the Bug
AlmostHeavenWV's Orientation Page for the Samba
_________________
1973 Standard Beetle
1600DP AK case
Solex 34PICT3 Carb
Bosch DVDA 205AJ Distributor |
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joey1320
Samba Member
Joined: September 12, 2006
Posts: 2325
Location: Cleveland, OH
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| Posted: Sun Sep 23, 2018 3:22 pm Post subject: Re: Newly built 1776 engine idles rough |
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Unfortunately you have aftermarket units for the most crucial aspects of a carbureted engine - carburetor and distributor.
You'll need to check your valves and then use a timing light to see what your timing is.
Clean looking engine.
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**1971 Super Project
https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0 |
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Danwvw
Samba Member
Joined: July 31, 2012
Posts: 8892
Location: Oregon Coast
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| Posted: Sun Sep 23, 2018 3:30 pm Post subject: Re: Newly built 1776 engine idles rough |
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Well, that looks like a wrong carburetor for that Distributor and if it has a cam that explains the rough idle. You may need to set the advance to more than 7.5' BTDC static to smooth it out or get an OEM DVDA distributor with vacuum lines at least the advance line hooked up to the PICT-34/3 Best solution though is to use a Fuel Injection system or Dual IDF or D carburetors. If your 69 is still using the original non doghouse fan shroud and oil cooler that would explain it running hot but it may be just that it is not broken in yet.
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1960 Beetle And 1679cc DP W-100 & Dual Zeniths! |
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ashman40
Samba Member
Joined: February 16, 2007
Posts: 15987
Location: North Florida, USA
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| Posted: Sun Sep 23, 2018 9:50 pm Post subject: Re: Newly built 1776 engine idles rough |
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| Claydoh wrote: |
| Newly built 1776 engine. I’m experiencing an issue with rust within my fuel system. I’ve been banging my carb to get it running when it pitter patters out. |
Pull the top off your carb and take out the float. Look into the fuel bowl and see if there are ANY deposits. It is a new engine and new carb. There should be NOTHING in there besides the fuel. If you have rust deposits it is likely your problem. If you are running a fuel filter it should catch the larger chunks but could allow fine dust thru. Unfortunately the carb passages are so small that even cardboard dust particles can clog them. Rust is even worse.
You need to take some action to clean out the tanks, the lines AND the carb. Until you can ensure the fuel delivery system is free of rust flakes you can't count on a reliable carb.
I like how clean and new your engine looks, but whomever built your engine was not trying for a reliable engine. It looks like they picked up the parts that were "most available".
The lean running 34Pict carb should not (cannot?) be matched to a mechanical-only distributor like the one you have. The carb expects a "boost" of ignition timing just as the throttle is open. This comes from the vacuum advance being connected to ported vacuum from the carb. Ported vacuum goes from zero at idle to nearly full vacuum advance as soon as the throttle plate is opened. After that it adjust based on engine load. This type of advance was meant to be an emission feature but the 34Pict carb was DESIGNED to work with such a distributor. Without this "boost" the engine falls flat just as the throttle opens. Also, there is a power available at cruise speeds that goes untapped when a vacuum advance distributor is not used.
_________________
AshMan40
---------------------------
'67 Beetle #1 {project car that never made it to the road  }
'75 Beetle 1200LS (RHD Japan model) {junked due to frame rot}
'67 Beetle #2 {2019 project car - Wish me luck!} |
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DurocShark
Samba Member
Joined: April 05, 2004
Posts: 6624
Location: Crappy town in a crappy state. But the beach is nearby, so I have that going for me.
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joey1320
Samba Member
Joined: September 12, 2006
Posts: 2325
Location: Cleveland, OH
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| Posted: Mon Sep 24, 2018 12:30 pm Post subject: Re: Newly built 1776 engine idles rough |
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Thanks for the link. I'm having a hesitation under load and this gives me the idea that it coutbe my coil. Mine isn't a generic one but it's rather old. Car sat since '98, so at least that old.
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**1971 Super Project
https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0 |
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DurocShark
Samba Member
Joined: April 05, 2004
Posts: 6624
Location: Crappy town in a crappy state. But the beach is nearby, so I have that going for me.
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| Posted: Mon Sep 24, 2018 1:08 pm Post subject: Re: Newly built 1776 engine idles rough |
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What kind of coil is it? There's no label visible, but unless it says Bosch on there somewhere, it's probably crap.
A good one will last a lifetime unless damaged. A crap one is, well, crap. 
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No boom today. Boom tomorrow. There's always a boom tomorrow. |
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Danwvw
Samba Member
Joined: July 31, 2012
Posts: 8892
Location: Oregon Coast
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| Posted: Mon Sep 24, 2018 4:30 pm Post subject: Re: Newly built 1776 engine idles rough |
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Yes It's all related, Spark, timing at take off, Advance curve, fuel squirter, and the one a lot of folks over look is too big of an exhaust pipe. 1 and 1/2" headers are too big for a 1600cc or even a 1776cc unless it has better heads like Mofoco 41's or L3's. I have run into these problems on my Dual Port Engines. Dual Carbs fix it though.
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1960 Beetle And 1679cc DP W-100 & Dual Zeniths! |
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