Another hot rod

[blue72s]

You also have to remember that the term ST is a relatively new one. In period the cars were 911S for competition or sports use.

Remember, the factory teams never raced a car on circuit, only in rally. There were quite a few works cars ( rally) and they usually used karmann shells with S chassis No.

Not tyring to stir the pot, but which paint tag did real ST's have - Porsche or Karmann? For reference, below are 2 pics...

[andyjboy]

Pipes are measured on the inside on all of the headers that I have ordered.

In my experience (nothing even close to Harvey's) the confusion arises because - certainly here in Europe - exhaust headers are described metrically by their internal diameter but imperially by their external diameter !

Hence we have:

1 1/2" headers with an internal diameter of 35mm

1 5/8" headers with an internal diameter of 38mm

1 3/4" headers with an internal diameter of 42mm

Most engine builders that I have talked to say 1 5/8 is not necessary for a -2.4 unless it is a full race engine even then it may be questionable. I have seen 1 1/2 on smaller engines.
H

I consulted a number of specialists when considering header sizes for my 2.5 litre twin-plug engine & got the unanimous advice that unless it was a full race engine - & thus spending most of its operating time in the upper rev range - then 1 1/2" (35mm) headers would be the best solution.

[andyjboy]

Not tyring to stir the pot, but which paint tag did real ST's have - Porsche or Karmann? For reference, below are 2 pics...

I'll be the first to 'stick my head above the parapet' & say that those 'ST' models I've seen in person here in the UK have all had Karmann paint tags ...

[blue72s]

1 1/2" headers with an internal diameter of 35mm

Do you by any chance know the part number?

I'll be the first to 'stick my head above the parapet' & say that those 'ST' models I've seen in person here in the UK have all had Karmann paint tags ...

Wow!
So, what about the first series (first 500) 1973 RS? Did those have Karmann paint tags as well? I understood that first series RS's had thinner roof skin etc..

[andyjboy]

Do you by any chance know the part number?

Sorry - I wasn't referring specifically to Factory parts.

I'd be surprised if the Factory offered headers in this size since, as far as I remember, even the 2 litre race engines (eg 901/22) had 38mm diameter exhaust ports.

[Flunder]

...share with us your impressions of driving the hotrod now that it is sorted...

Just feather the throttle in first

Pipes burble contentedly

East out from Sperryville

Dive hard right down 231

Straight into the heart of a silent valley

A dancing wraith in an Olive robe

Heading due south in a pre-dawn mist

Now dive and squat

Then turn and dart

A languid, fluid swing of the hips follows each faint twitch of the haunches

As the throttles crack open

Just past apex

Unhurried steps of the dance measured to a fugue of megaphone exhaust

Deep booming tympany builds to redline

Answered by shattering staccato on the over-run

Free fall down a twisted ribbon of asphalt

The echo of its passage

Summons forth a regal oculus in the heavens

Revealed now from behind the ridgeline

Mute witness to the dance

Its luminescent majesty diffuses in the mist

And sets aglow sleeping meadows

Blanketed in blue grass and clover

Change down and brake hard

Passing through each in turn still slumbering Etlan and tiny Banco

Roll again onto the throttle

Haunches twitch and

Squat low on the tarmac

The dance begins anew

An urgent release of dry thunder beneath a cloudless sky

Exploding into the perfection of first light

A mystical union of steel, spark, air and fuel

Bound for the Piedmont

[Reza]

Tom, i dont know what 'oculus' means, but otherwise great transliteration of what musta been a tremendous driving experience :-)

[tom1394racing]

Tom

Both our cars are at the Mecca of Early 911's at the moment.

How about we meet when mine is ready for an early morning drive.

[letsrollbabe]

Tom:

Who knew you were such a talented poet...we all thought you were a Porsche historian digging up old spec sheets and stories about how parts came to be used, and then hanging them on your art project. One line in that beautiful song of lines captures what the STs represent to me....'A mystical union of steel, spark, air and fuel'... Enjoy that wonderful ride as much as possible.

[Longballa]

The Porsche bug is a sickness. It's just that some of us are sicker than others! This thread is a testament to that! Nice ST build.