Intake manifold construction, intercoolers

[Greg Hermann]

At 3:42 PM 12/7/01, Mos wrote:
>On Wed, 5 Dec 2001, Bruce wrote:
>
>>
>> Marketing.
>> The best performing Reasonably priced car in the world today still uses an
>> OHV engine.
>
><delurk>
>What is this "best performing Reasonably priced car" that you speak so
>highly of?
>
>> Most of the turbo'd engines in production cars are based on bits the
>> manufacturer has laying around.   The only reason for multi-valves etc., is
>> due to rules, in the street world it's the EPA, in racing it's displacement.
>
>Please correct me if I'm wrong - EFI came from EPA, as opposed to
>multi-valve coming from EPA.
>
>Mos.

You are wrong, in part, Moe. Multi valve on street engines came from EPA
(and CAFE) rules, every bit as much as EFI and ALSO SOHC and DOHC has.

Multi valves make higher valve velocities possible--which allows reasonable
lift values with short duration--directly related to both emissions and
CAFE-- and SOHC and DOHC not only tend to allow higher valve velocities,
but also facilitate variable valve timing--which are also emissions and
CAFE induced features as far as street motors are concerned .

Greg


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