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VWNYCMike
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Joined: March 30, 2022
Posts: 27
Location: NYC USA
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 Posted: Mon Nov 21, 2022 4:33 pm Post subject: 1978 Type 181 // Correct Engine Code |
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Hello all,
I'm trying to determine what is the correct engine code for a 1978 VW Type 181 originally delivered to the German Army. Based on the data I could find it might be either AF or AS but I could be completely wrong!
Many thanks in advance,
Mike
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Joe 20
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Joined: August 27, 2005
Posts: 655
Location: Ohio
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| Posted: Mon Nov 21, 2022 8:47 pm Post subject: Re: 1978 Type 181 // Correct Engine Code |
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There is a military 1974 for sale here with an AL engine code if that helps. What is yours? Mine is not military and has the original AM engine.
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Al Capulco
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Joined: October 31, 2005
Posts: 532
Location: Northridge, CA.
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| Posted: Tue Nov 22, 2022 12:33 am Post subject: Re: 1978 Type 181 // Correct Engine Code |
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| Should be AL from '73 - '80 German military model. |
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el_safari
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Joined: January 01, 2005
Posts: 375
Location: Nouvelle Aquitaine,France
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| Posted: Tue Nov 22, 2022 8:35 am Post subject: Re: 1978 Type 181 // Correct Engine Code |
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All the 181s sold new in Europe from march 1973 on have the code AL when it is the original engine. 
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VWNYCMike
Samba Member
Joined: March 30, 2022
Posts: 27
Location: NYC USA
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| Posted: Tue Nov 22, 2022 5:49 pm Post subject: Re: 1978 Type 181 // Correct Engine Code |
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| el_safari wrote: |
| All the 181s sold new in Europe from march 1973 on have the code AL when it is the original engine. |
Many thanks ! |
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VWNYCMike
Samba Member
Joined: March 30, 2022
Posts: 27
Location: NYC USA
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| Posted: Tue Nov 22, 2022 5:49 pm Post subject: Re: 1978 Type 181 // Correct Engine Code |
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| Al Capulco wrote: |
| Should be AL from '73 - '80 German military model. |
Many thanks ! |
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VWNYCMike
Samba Member
Joined: March 30, 2022
Posts: 27
Location: NYC USA
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| Posted: Tue Nov 22, 2022 5:50 pm Post subject: Re: 1978 Type 181 // Correct Engine Code |
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| Joe 20 wrote: |
| There is a military 1974 for sale here with an AL engine code if that helps. What is yours? Mine is not military and has the original AM engine. |
Many thanks ! |
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SilverThing 
Samba Member
Joined: July 19, 2004
Posts: 810
Location: Everett
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| Posted: Sun Dec 04, 2022 1:56 pm Post subject: Re: 1978 Type 181 // Correct Engine Code |
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I just checked the 1978 parts microfiche that I have. Down in the production information both AF and AL engines are listed for 1978 models.
Below is some information I posted back in 2018 on VW 181 engines. As you can see, the difference between AF and AL is the compression ratio. AF is 6.6:1 and AL is 7.3:1. The AF engine is associated with the M240 option code, which is a reduced compression ratio for low octane fuel. AL engines require 91RON and AF require 83RON. I should note to American readers that 91RON is equivalent to our 87AKI "regular unleaded".
| SilverThing wrote: |
As far as I have seen in official documentation, the 181 had 5 different engines during its production run.
The first engine was a single port 1500cc engine. The cylinders heads were 311.101.353A, which I believe is the same head the 1600 single port engine used (35.5x32 valve size). Compression ratio was 7.5:1. The power output was DIN BHP 44 @ 4000 rpm, 102 NM torque @ 2000 rpm. Carburetor was a 30pict-2 (24mm venturi). Octane requirement: 91 RON. Other interesting tidbits are galvanized pushrod tubes and clutch plates without torsion springs (those two items carried through to other 181 engines). The letter code is 'H', but I like to refer to them as 'H1' engines because the first digit is 1 unlike other H case engines. For civilian models, the engine was only offered in the 1970 model year (ie 8/69 -7/70). Military users continued to get the engine until the end of January, 1971.
The second engine was the 'AG' engine. It was introduced in the 1971 model year (at different times depending on whether the vehicle was military or civilian) and displacement increased to 1600cc. The compression ratio was reduced to 6.6:1 via dished pistons. Power output: DIN BHP 44 @ 3800 rpm, 100 NM torque @ 2000 rpm. The cylinder heads “were like the new type 1/1600”. The intake manifold is the same as the 1300dp engine (31pict-3 carburetor with 25.5mm venturi) and doghouse oil cooler. Octane requirement is 83 RON. The engine was offered until the end of the 1975 model year.
In March/April of 1973 two new engines were introduced: 'AL' and 'AM'. The dished pistons of the 'AG' engine were replaced with slight dished pistons (standard equipment on all other 1600cc engines since Aug 1971). Compression ratio was back up to 7.3:1, power output was DIN BHP 48 @ 4000 rpm, 102 NM torque @ 2000 rpm. The intake manifold was increased in size (35mm – previously 33mm) and the heat risers were also enlarged (24mm from the previous 20mm). The carburetor was 34pict-3 (26mm venturi). Octane requirement was back up to 91 RON (I have one brochure that also mentions 80 MON). 'AM' engines were for US market emissions in 1973 and 1974 (fuel vapor recovery system, dual vacuum distributor, and exhaust gas recirculation). AL engines were available everywhere else for 1973 thru 1978.
In 1974, the 'AF' engine was added to the lineup (or rather borrowed from other lineups). It is listed as a 6.6:1 compression ratio with 46 DIN BHP @ 4000 rpm, and 100 NM of torque @ 2600 rpm. Carburetor is 34pict-3. Octane requirement is 83 RON. |
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