Kit 1385cc big bore 83mm with 1.25

[Fraboni Mirko]

hello everyone, I would like to open my 1200 mexico, install a 1385cc kit, and I was thinking of putting 1.25, I don't know how to say it in English? I'm Italian if I translate the word it would be "castles". in any case those components that serve to press the valves more. alternative to change camshaft. has anyone ever tried with 1385cc to use these 1.25 "castels"? leaving the original camshaft. I would like to give more power to the 1385cc also leaving the carburetor original, I don't want to put double carburetor kits.

[mukluk]

The word you're looking for is rockers, as in 1.25:1 ratio rocker arms. I don't see a reason why you couldn't try them on a 1385, but I imagine they likely won't make much difference due to the airflow restriction of the stock 40hp intake manifold and cylinder heads.
_________________
1960 Ragtop w/Semaphores "Inga"

[RWK]

You can use later rockers also, 1300-1600, they are 1.1-1 so slightly better than 1200 rockers.
_________________
73 Type 181
63 Type 113
63 Type 261- 428 071
62 Type 241-378 025 178 530

[Fraboni Mirko]

thanks guys, you are always super helpful and quick to respond. regarding the head I wanted to try to improve a bit the intake and exhaust ducts. then I thought of enriching a bit the mixture of my 30 pic-t 3 carburetor and setting it like the pict-2. but my beetle which is a 1200cc Mexico year 1982, what rockers will it have? only 1:1? is it possible that so modern it doesn't have at least 1.1:1?

[mukluk]

It's easy to determine what rockers your car has by just removing the valve covers and having a look. Stock VW 1:1 rockers are smooth on the side opposite of the stamped markings, while the stock VW 1.1:1 rockers have a pair of raised ridges on the side opposite the stamped markings.

In both of the pictures from the gallery below, 1:1 rockers are on the left and 1.1:1 rockers are on the right. Note the pair of raised ridges on the "smooth" side.

_________________
1960 Ragtop w/Semaphores "Inga"

[Fraboni Mirko]

perfect, I didn't know they recognized each other that way. Thanks! Another question, what if instead of putting 1.25 rockers I put a 90 camshaft?

[mukluk]

You'd need to increase the engine's static compression ratio to around 8:1 to 8.25:1 with the W90 camshaft due to its longer duration versus stock. I'd expect to see a bit more low and mid range power, but the 40hp intake and heads will still limit you up top.
_________________
1960 Ragtop w/Semaphores "Inga"

[Fraboni Mirko]

If I increase the displacement to 1385cc, according to my calculations, I would arrive at a compression ratio of approximately 8.3:1.

[puchfinnland]

If you join Vintage VW club of america, Jake Raby built a 1200cc and wrote a series of articles on his changes.

https://vvwca.com
_________________
ABYC marine master technician , EX European auto technician, new business- EASTCOASTWEST , custom work on campers, only systems, no mechanical

[Rome]

Pick your 1385 cc 83 mm piston/cylinder kit carefully for your Mexican "late" 1200 case- this is the one you need- https://aapistons.com/collections/vw-piston-liner-...-european. There is a different 1385 cc kit for the original 1200 engine from the 1960's which has a different piston pin height.

[1958ghia]

[[email protected]]

[PeteSC]

[1958ghia]

Thanks for the kind words! Unfortunately I didn't do a build thread here, but "borrowed" a LOT of wisdom from many builds.