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nikbrewer
Samba Member
Joined: April 30, 2015
Posts: 23
Location: edmond
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 Posted: Mon Oct 25, 2021 7:45 pm Post subject: 1776 carb and dizzy advice |
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Just picked up a 73 super. Trying to sort out some of the odd choices they made.
Engine is about 12 year old GEX remanufactured 1776. I have the original invoice. No mention of any other parts, so Im guessing stock can, stock heads.
In the last year they have installed dual 40HPMX kit, and what looks like a 009 dizzy with a pertronix module.
Timing set good. Runs good at top end but mid throttle not great. Im thinking this is just way too much carb for a bone stock 1776.
I am thinking going back to stock carb and a pertronix SVDA dizzy. Hoping this makes it a better cruiser without too much loss in top end.
This sound like a good choice? |
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mcdragracer
Samba Member
Joined: December 30, 2007
Posts: 714
Location: Cally
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| Posted: Mon Oct 25, 2021 7:54 pm Post subject: Re: 1776 carb and dizzy advice |
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What is it about mid throttle that is not great? And actually those 40s will work just fine on a stock 1776.
Just be cautious If you choose to go to a stock carb and if that motor does have a cam, it might be very difficult to tune and function well. |
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bigbore
Samba Member
Joined: December 19, 2003
Posts: 3297
Location: Wasilla Alaska
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| Posted: Mon Oct 25, 2021 10:09 pm Post subject: Re: 1776 carb and dizzy advice |
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GEX  run away run away!!!!!!!!!!! 
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Igpoe
Samba Member
Joined: February 24, 2019
Posts: 853
Location: South Boston, VA
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| Posted: Tue Oct 26, 2021 3:36 am Post subject: Re: 1776 carb and dizzy advice |
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Inside of distributor needs close inspection for cleanliness and lubrication. May not be advancing properly. Return it to points instead of electronic module and see how it advances.
Or you might have an unsuitable cam. GEX only ever built "sweep the floor" motors with unknown parts!
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'73 super. |
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tasb
The Distributor Distributor
Joined: April 27, 2002
Posts: 6371
Location: Pentwater, Michigan
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| Posted: Tue Oct 26, 2021 3:52 am Post subject: Re: 1776 carb and dizzy advice |
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When did a dual carburated 1776 engine become "bone stock"?
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nikbrewer
Samba Member
Joined: April 30, 2015
Posts: 23
Location: edmond
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| Posted: Tue Oct 26, 2021 5:42 am Post subject: Re: 1776 carb and dizzy advice |
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| tasb wrote: |
| When did a dual carburated 1776 engine become "bone stock"? |
I was just saying it does not seem to have any other performance parts. It seems to be stock heads, cam etc. |
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nikbrewer
Samba Member
Joined: April 30, 2015
Posts: 23
Location: edmond
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| Posted: Tue Oct 26, 2021 5:44 am Post subject: Re: 1776 carb and dizzy advice |
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| bigbore wrote: |
| GEX run away run away!!!!!!!!!!! |
Yeah, not my fav. I remember them being bad 20 years ago. For now it runs okay. Who know how long it will last. |
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Lingwendil
Samba Member
Joined: February 25, 2009
Posts: 3988
Location: Antioch, California, a block from the hood
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Cusser
Samba Member
Joined: October 02, 2006
Posts: 31374
Location: Hot Arizona
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| Posted: Tue Oct 26, 2021 6:41 am Post subject: Re: 1776 carb and dizzy advice |
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| nikbrewer wrote: |
| Engine is about 12 year old GEX remanufactured 1776. |
| bigbore wrote: |
| GEX run away run away!!!!!!!!!!! |
Just run the engine, even if it is GEX. Sometimes the blind squirrel finds a nut !!!
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Last edited by Cusser on Tue Oct 26, 2021 12:25 pm; edited 1 time in total |
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nikbrewer
Samba Member
Joined: April 30, 2015
Posts: 23
Location: edmond
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| Posted: Tue Oct 26, 2021 7:09 am Post subject: Re: 1776 carb and dizzy advice |
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| Lingwendil wrote: |
I bet the jetting is off, and the distributor is not the greatest. Baseline jetting is often too lean.
First thing I would do is pull all the jets, write down the sizes, do an initial carb setup and synch, and set the timing. When you set the timing you will be able to see how the distributor behaves. |
Would switching to a SVDA dizzy help off idle throttle response and light throttle cruising? |
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Lingwendil
Samba Member
Joined: February 25, 2009
Posts: 3988
Location: Antioch, California, a block from the hood
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| Posted: Tue Oct 26, 2021 7:19 am Post subject: Re: 1776 carb and dizzy advice |
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if your carbs pull enough vacuum on the port, yes, but I would get the carbs as close as possible first before worrying about that. At least verify your jetting, sync the carbs, set the timing, and dial in the accelerator pump squirt first. Then you can see what kind of vac the advance ports pull, and see if it's enough to pull a can on an SVDA. Sometimes these carbs don't pull enough vacuum, especially if the engine hasn't been set up correctly, or isn't in good tune.
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73 super beetle thread http://www.thesamba.com/vw/forum/viewtopic.php?t=649622 Back on the Road!
Modify your Kadrons for SVDA http://www.thesamba.com/vw/forum/viewtopic.php?p=8115884#8115884
Cast iron VJU4BR8 SVDA reference thread- https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0
Need replacement filters for original Kadron aircleaners? WIX #42087 is a perfect fit, as is Napa Gold #2087! |
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toxicavenger70
Samba Member
Joined: July 28, 2019
Posts: 871
Location: CO
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| Posted: Tue Oct 26, 2021 1:08 pm Post subject: Re: 1776 carb and dizzy advice |
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| I would go back to the stock carb and dist. |
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Alstrup
Samba Member
Joined: July 12, 2007
Posts: 7215
Location: Videbaek Denmark
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| Posted: Tue Oct 26, 2021 1:13 pm Post subject: Re: 1776 carb and dizzy advice |
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HPMX carbs need to be modified to pull enough vacum for an SVDA.
But thatīs not the problem. Thatīs fine tuning.
99% certain carb sync and jetting.
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texastomeh
Samba Member
Joined: November 20, 2018
Posts: 291
Location: Dallas, TX
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| Posted: Tue Oct 26, 2021 6:54 pm Post subject: Re: 1776 carb and dizzy advice |
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Alstrup wrote:
| Quote: |
| HPMX carbs need to be modified to pull enough vacum for an SVDA. |
I am probably going to encounter this issue on my new 1776 build with dual 40 HPMX's and PerTronix lll SVDA.
I plan to use the 009 initially but would like to "upgrade"(?) to the SVDA eventually.
I have found lots of info re "anti-pulse valves" and vacuum hose connections, but nothing re modifying the carbs. 
Would you please elaborate or point me to an informative thread?
THANX and STAY WELL!!! 
Tom
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Rome
Samba Member
Joined: June 02, 2004
Posts: 9651
Location: Pearl River, NY
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| Posted: Wed Oct 27, 2021 3:33 pm Post subject: Re: 1776 carb and dizzy advice |
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| Lingwendil wrote: |
I bet the jetting is off, and the distributor is not the greatest. Baseline jetting is often too lean.
First thing I would do is pull all the jets, write down the sizes, do an initial carb setup and synch, and set the timing. When you set the timing you will be able to see how the distributor behaves. |
In addition, you'll need to remove the air cleaner top and filter to access the tall brass pipes in the middle of the carb top and remove them. At the very bottom of those pipes will be the main jet. Hopefully it has the size stamped into the side; look for numbers such as 115, 125, etc.
Then take a flashlight and shine it down the rear (back of car) carb throat. Look down the throat to the venturi, which is the "collar" that has a smaller diameter than the carb throat above. You "should" see a 2-digit number cast into the top of the venturi, such as 28 or 30. That is the venturi smallest diameter in millimeters.
Idle jets are accessed from the sides of the carbs and will be very hard to reach on your Beetle due to the engine compartment side panels coming close to the carbs. You can try the front idle jet on one side since the engine side panel widens going frontwards, but you'll need a very short/stubby flat-blade screwdriver. "Usually" all 4 idle jets are the same size per carb set. Once out, the idle jet should also have small numbers stamped into it, such as 50, 55, 60.
I think a pair of 40 HPMXs will be fine for an otherwise stock 1776; though hopefully you have an upgraded exhaust. My stock 1600 dual-port with just some home-ported heads, 1 3/8" header and genuine Weber 40 IDFs runs strong. |
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