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Reply to "Vintage Speedster Oil Breather Pipe"

Kevin, several things could be going on with your engine. You indicated that your engine was "not happy" above 4,000 RPM's.

Also, you indicated that you have twin carburetors but failed to indicate if each carburetor is a single or double barrel carburetor.

If the engine is a stock engine, its dimensions are as follows: 69 mm stroke from the crankshaft and 85.5mm piston bore. More that likely your crankshaft is not counterweighted or balanced.

Most stock 1,600 cc VW cars were capable of 85 to 90 MPH which in turn translates to roughly 4,200 to 4,500 RPM's and a stock VW wasn't very aerodynamic.
Having twin carburetors, (single or double barrel) is an increase over stock carburation which was a single small carburetor. I would think that your cars profile vs a stock VW would allow your engine to propel your car a bit faster than roughly 80 MPH. It's possible that you may need a little bit of tune up work done to your engine.

Is it a new car or did you buy it used?
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