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MountainKeep
Samba Member
Joined: March 07, 2018
Posts: 124
Location: North Carolina
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 Posted: Mon Feb 10, 2020 9:19 am Post subject: Timing Questions re AH 1600dp? |
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Hey Volks,
Questions, questions...
I have an AH317186 1600dp that is supposed to have come out of a 73 Super Beetle. It has a Solex 34-Pict 3 carb (VW 343-3). The distributor is a VW 0 231 170 034 single vacuum.
Is this the stock distributor and carb for this motor ya think? Will they at least work well together?
And what should I be shooting for regarding baseline timing? 5 degrees ATDC? Or 7.5 degrees BTDC?
I have three notches on the motor side of my pulley and no dimple on the bumper side. Not sure what the notches mean? Is one of them TDC or are they all three timing degrees?
I have read and read and I seem to be getting conflicting information.... and my eyes are starting to cross...
Any and all help is greatly appreciated.
Thanks!
_________________
White 71 Campmobile known lovingly as "the Sulphur-Crested Cockatoo." |
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ashman40
Samba Member
Joined: February 16, 2007
Posts: 15987
Location: North Florida, USA
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| Posted: Mon Feb 10, 2020 10:00 am Post subject: Re: Timing Questions re AH 1600dp? |
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| MountainKeep wrote: |
I have an AH317186 1600dp that is supposed to have come out of a 73 Super Beetle. It has a Solex 34-Pict 3 carb (VW 343-3). The distributor is a VW 0 231 170 034 single vacuum.
Is this the stock distributor and carb for this motor ya think? Will they at least work well together? |
Here is a table from glutamodo with carb base flange#s by year and their matching distributors:
VW 343-3 appears to be the original carb for a '73 California Autostick Beetle which came with a DVDA distributor (205AH).
Your SVDA distributor (if original Bosch) is from a '73-'74 48-state manual transmission Beetle. So it does NOT match your carb. These two are not 100% compatible. The DVDA carbs came with a larger hole thru the throttle plate to allow the engine to idle with a retarded timing. There is a thread on modifying the throttle plate hole to allow the DVDA carb to work well with an SVDA distributor. Can you run the SVDA with that carb, yes. But you may experience off idle hesitation until you fix the hole in the throttle plate.
| MountainKeep wrote: |
And what should I be shooting for regarding baseline timing? 5 degrees ATDC? Or 7.5 degrees BTDC?
I have three notches on the motor side of my pulley and no dimple on the bumper side. Not sure what the notches mean? Is one of them TDC or are they all three timing degrees? |
If you have the original carb and original distributor then you can use the manual recommend timing for your car's model year. But if you change either (as in your case) you want to set timing based on the distributor model installed.
See this link for your distributor specs ('74 48-state man trans):
http://www.type2.com/~keen/ignition.html#A1974MFD
If you are going to use that distributor, set the timing based on the distributor, not the engine or model year. Those SVDA distributors are set at "7.5deg BTDC @ 800-950rpm w/strobe and w/single vacuum hose disconnected and plugged".
Your pulley sounds like the '66-'70 pulley with 3 notches. See this table:
This suggests your pulley is not original to your engine?
CCW most notch is TDC. Middle notch is 7.5BTDC (correct mark for your distributor) and the CW most notch is 10BTDC.
If you want to be 100% certain, get a TDC tool and insert it into #1 spark plug hole just enough so that it hits the top of the piston a few degrees before TDC. Pencil mark the case split on the pulley. Rotate the crank almost 360deg in the opposite direction until the piston once more contacts the tool. Mark a second pencil mark on the pulley. Your TDC mark should be exactly half-way between these two pencil marks. If it is, great! If not, make a new TDC mark at the half-way point.
_________________
AshMan40
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'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!}
Last edited by ashman40 on Mon Feb 10, 2020 10:06 am; edited 1 time in total |
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AlmostHeavenWV_VW 
Samba Member
Joined: October 12, 2017
Posts: 1966
Location: WV
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Xevin
Samba Member
Joined: January 08, 2014
Posts: 7635
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| Posted: Mon Feb 10, 2020 10:59 am Post subject: Re: Timing Questions re AH 1600dp? |
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To clarify for everyone reading this, it’s a 73 bug engine going in a heavy 71 Campmobile.
I see you forgot I PM’d you all this info back in January  
This is one of the links I sent you in regards to induction for your heavy bus.
Getting the subtle nuances of these engines in order can be the difference of great, good, and fair performance. Pay special attention to wcfvw69 responses in the link.
https://www.thesamba.com/vw/forum/viewtopic.php?t=...11513acafd
_________________
Keep on Busin'
| 67rustavenger wrote: |
GFY's Xevin and VW_Jimbo!  |
| Clatter wrote: |
| Damn that Xevin... |
| skills@eurocarsplus wrote: |
I respect Xevin and he's a turd  |
| SGKent wrote: |
My God! Xevin and I 100% agree  |
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MountainKeep
Samba Member
Joined: March 07, 2018
Posts: 124
Location: North Carolina
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| Posted: Mon Feb 10, 2020 1:09 pm Post subject: Re: Timing Questions re AH 1600dp? |
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| Xevin wrote: |
| To clarify for everyone reading this, it’s a 73 bug engine going in a heavy 71 Campmobile. |
Thanks for narcin' on me there Xevin! They would have never known if you hadn't told them... unless of course they happened to have read my signature line that is. Next you'll be telling them that I weigh 275 pounds too!
Thanks for all the information everyone (even Xevin). Although I was really hoping to make what I have work, it's looking like I will need to replace either the carb or the distributor.. maybe both.
In the interest of my long range plan to return to stock, perhaps I should consider this https://www.thesamba.com/vw/classifieds/detail.php?id=2352415
and a new wife, because this one will leave me if I spend anymore money...
_________________
White 71 Campmobile known lovingly as "the Sulphur-Crested Cockatoo." |
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ashman40
Samba Member
Joined: February 16, 2007
Posts: 15987
Location: North Florida, USA
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| Posted: Mon Feb 10, 2020 1:45 pm Post subject: Re: Timing Questions re AH 1600dp? |
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If you are considering modifying your DVDA carb to work better with your SVDA distributor, read these threads and the links within them...
https://www.thesamba.com/vw/forum/viewtopic.php?t=340069
https://www.thesamba.com/vw/forum/viewtopic.php?t=365762
They describe how to make the throttle plate hole smaller. The easy way is to use a pop rivet to fill the hole and drill the proper (smaller) size hole into the center of the rivet. No need to disassemble the carb, just remove the carb from the intake to install and drill the rivet.
Of course you could just try running the two together at 7.5BTDC idle timing and if they work "good enough", just leave it that way.
_________________
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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airschooled
Air-Schooled
Joined: April 04, 2012
Posts: 12728
Location: on a bike ride somewhere
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| Posted: Wed Feb 12, 2020 6:23 pm Post subject: Re: Timing Questions re AH 1600dp? |
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I think the reason you’re getting conflicting info and crossed eyeballs could be because there are multiple ways to skin many cats.
Give the current carb and distributor a shot. Time it to 28* max advance with both hoses off and tune the carb with the Bentley instructions. You may be surprised with how well some parts work together. It will CERTAINLY buy you time with a running car so you can figure out your engine’s needs in the mean time.
See you on the road,
Robbie
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Learn how your vintage VW works. And why it doesn't!
One-on-one tech help for your Volkswagen:
www.airschooled.com |
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MountainKeep
Samba Member
Joined: March 07, 2018
Posts: 124
Location: North Carolina
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| Posted: Wed Feb 12, 2020 7:22 pm Post subject: Re: Timing Questions re AH 1600dp? |
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Funny you should post that now Robbie... I was just about to provide everyone with an update.
I finished up a tune-up and carb adjustment this afternoon and the old girl is running and driving surprisingly well now. I am certainly going to give this set up a chance first.
I only statically tuned it to 7.5* before TDC. I have a timing light on the way and will try and hone in on more precise tuning when it arrives. I was pretty happy with the motor's performance though as is.. it didn't seem to have any flat spots during acceleration.. good power.. and idled well with only a small "poot poot" sound... I still have to adjust the valves so I'm hoping that will help with that. I dove it up and down hills for some time and when I got back, I was still able to pinch and hold on to the oily end of the dipstick... so it seems to like where I have things now fairly well I'd say.
As usual, many thanks to everyone for all their help!
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White 71 Campmobile known lovingly as "the Sulphur-Crested Cockatoo." |
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Igpoe
Samba Member
Joined: February 24, 2019
Posts: 853
Location: South Boston, VA
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| Posted: Thu Feb 13, 2020 4:53 am Post subject: Re: Timing Questions re AH 1600dp? |
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| Excellent, now try to get ahead of spending problems by saving for a set of dual one barrel carbs! There's no such thing as being done spending! |
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