'99 323i 12 or 24 valve ?

Basic question is it 12 or 24 valve ?

Tony

The latter.

"apk1" > wrote in message
...
| Basic question is it 12 or 24 valve ?
|
| Tony
|
|

apk1 wrote:

> Basic question is it 12 or 24 valve ?
>
> Tony

4 valves/cylinder x 6 cylinders = 24 valves -

Frank

24.




"apk1" > wrote in message
...
> Basic question is it 12 or 24 valve ?
>
> Tony
>
>

Thanks all, was'nt sure, thought was 12

Tony

"Jeff Strickland" > wrote in message
...
> 24.
>
>
>
>
> "apk1" > wrote in message
> ...
>> Basic question is it 12 or 24 valve ?
>>
>> Tony
>>
>>
>
>

Jeff Strickland wrote:

> That is only 2 per cylinder, I do not recall any motor made today that uses
> that technology, with the possible exception to the Viper. The Viper's V10
> only has 20 valves. Most engines today use 3 or more valves per cylinder,
> this facilitates a better blended mixture reaching the combustion chamber,
> which results in better fuel economy and cleaner burning.
>

Lots of big American engines use 2 valves per cyl. Easier to do it that
way with pushrods and rocker arms. And before you ask, yes, there is a
good reason why some engines still have pushrods, you can get a lower
overall height without an overhead cam. That was one of the reasons
given for retaining the single central camshaft and pushrods for the new
Corvette motor.

nate

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You can fit a bigger valve surface area in a the same size bore using
four circles rather than two, although each valve is then smaller and
thus lighter allowing for higher revving without the need for super
heavy duty valve springs.

In article >,
Nate Nagel > wrote:
> And before you ask, yes, there is a
> good reason why some engines still have pushrods, you can get a lower
> overall height without an overhead cam. That was one of the reasons
> given for retaining the single central camshaft and pushrods for the new
> Corvette motor.

It's also cheaper. ;-)

--
*If love is blind, why is lingerie so popular?

Dave Plowman London SW
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Jeff Strickland wrote:
> That is only 2 per cylinder, I do not recall any motor made today
that uses
> that technology, with the possible exception to the Viper.

Um, GM's 5.7 V8? Quite a populous engine .

Ford and GM still make 2 valve/cyl engines in Australia. All petrol
engines made by European manufacturers have more than two valves per
cylinder, but VW (and others) still make many 2 valve/cyl diesel
engines every year (although even these are switching to four-valve
cylinder heads).

Andrew Thomas wrote:

> Jeff Strickland wrote:
>
>>That is only 2 per cylinder, I do not recall any motor made today
>
> that uses
>
>>that technology, with the possible exception to the Viper.
>
>
> Um, GM's 5.7 V8? Quite a populous engine .
>
> Ford and GM still make 2 valve/cyl engines in Australia. All petrol
> engines made by European manufacturers have more than two valves per
> cylinder, but VW (and others) still make many 2 valve/cyl diesel
> engines every year (although even these are switching to four-valve
> cylinder heads).
>

VW has finally ****canned the 2.0?

nate

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replace "fly" with "com" to reply.
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