Automotive Dictionary: Bath Tub Combustion Chamber

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Automotive Dictionary: Bath Tub Combustion Chamber
Throughout this site we use many technical terms, and given the breadth of readership our site enjoys, sometimes we are remiss and incorrectly assume everyone knows what we are referring to. For those that do not, here are some explanations of the technical terms use.
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Bath-Tub Combustion Chamber


A design of combustion chamber which, viewed upside down, looks like a hip bath, the deeper portion containing the valves and plug orifice and the rest tapering off to nothing across the remainder of the piston area. Thus, as combustion spreads, the flame front of the unburnt gas gets narrower, helping to keep the 'end gas' cool and to lessen the likelihood of detonation or pinking.
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