Re: 1958 M. Benz 190SL and octane levels
- From: "T.G. Lambach" <tlambach@xxxxxxxxxxx>
- Date: Wed, 05 Oct 2005 13:42:09 -0700
Octane isn't power, its ignition at a higher temperature to prevent preignition in a high compression ratio engine.
You don't say that the engine runs poorly - coughing and sputtering - only that it lacks (acceleration) power.
A carburetor works on the Bernoulli principle - that rushing air will draw a liquid into its stream. To that, an acceleration pump is added to kick extra fuel for acceleration, otherwise the air / fuel ratio would become too lean as the throttle is opened. The engine will cough and sputter if the air / fuel mixture is too lean (fuel starvation) which you don't cite.
These new carbs - do they have similar size venturis as the old ones?
I suggest you first check that they're the correct size for the engine.
Or, if the power reduction is not large, it could be that the old carbs were set too rich and, though nice to drive, were gross HC polluters that no longer could pass an emissions test. If that's why they were replaced then that's the answer to your post.
This engine will run well with the proper air / fuel ratio but do so without the robust torque that you've become used to.
.
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