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Search: Posts Made By: chris_seven
Forum: Porsche 911 Technical Forum 11-20-2017, 01:11 PM
Replies: 6
Views: 697
Posted By chris_seven
Phil, How thick is your brake pedal? ...

Phil,

How thick is your brake pedal?

One of our competitors in the UK makes a box with an 5mm thick pedal but these tend to bend under duress and on early LHD boxes the standard was 8mm thick....
Forum: Porsche 911 Technical Forum 11-20-2017, 10:24 AM
Replies: 6
Views: 697
Posted By chris_seven
Tadd, I would be more than happy to supply...

Tadd,

I would be more than happy to supply you with a 'kit' of parts if that helps. :)
Forum: Porsche 911 Technical Forum 11-19-2017, 01:48 AM
Replies: 14
Views: 1,438
Posted By chris_seven
You will not really find a tyre that is a decent...

You will not really find a tyre that is a decent compromise between Asphalt and Gravel.

If you use a Gravel Tyre aggressively on Asphalt you will suffer as the blocks will deform and they tend to...
Forum: Porsche 911 Technical Forum 11-17-2017, 05:04 PM
Replies: 44
Views: 3,625
Posted By chris_seven
Pitting and Intergranular corrosion are different...

Pitting and Intergranular corrosion are different mechanisms but in general terms both of these defects types are environmentally assisted.

The most important mechanism is most likely to be the...
Forum: Porsche 911 Technical Forum 11-17-2017, 12:21 AM
Replies: 44
Views: 3,625
Posted By chris_seven
Why? :confused: Dilavar is an Iron based...

Why? :confused:

Dilavar is an Iron based alloy with some Nickel, Chrome, Moly and a few other elements that are all soluble in Iron.

It really isn't witchcraft and all that will happen is that...
Forum: Porsche 911 Technical Forum 11-15-2017, 10:23 AM
Replies: 44
Views: 3,625
Posted By chris_seven
You can clearly see the influence of the...

You can clearly see the influence of the intergranular corrosion which will most likely only affect the lower Dilavar Studs. The stud appears to have lost around 40% of it's cross-section so it...
Forum: Porsche 911 Technical Forum 11-15-2017, 10:10 AM
Replies: 36
Views: 7,946
Posted By chris_seven
$1250 if you can supply a 'core' unit. We...

$1250 if you can supply a 'core' unit.

We fit bronze bushes, new springs and re-plate/re-paint in an Epoxy 2k Lechler material.

This price includes a fitting kit with fill lines, reservoirs,...
Forum: Porsche 911 Technical Forum 11-15-2017, 09:54 AM
Replies: 36
Views: 7,946
Posted By chris_seven
I posted this information recently as we still...

I posted this information recently as we still make these pedal boxes on a routine basis.


http://imagizer.imageshack.us/v2/xq90/922/GrrTvc.jpg (https://imageshack.com/i/pmGrrTvcj)

We have...
Forum: Porsche 911 Technical Forum 11-14-2017, 10:41 AM
Replies: 44
Views: 3,625
Posted By chris_seven
Are they magnetic ? is a good starting point as...

Are they magnetic ? is a good starting point as it is unlikely that any cheap copies would use an Austenitic material with sufficient strength to do the job as there is unlikely to be much of a...
Forum: Porsche 911 Technical Forum 11-14-2017, 09:07 AM
Replies: 44
Views: 3,625
Posted By chris_seven
The failure of early Dilavar Studs is due to a...

The failure of early Dilavar Studs is due to a very straightforward mechanism.

Dilavar is a Precipitation Hardening Austentic Stainless Steel which suffers from intergranular corrosion in the...
Forum: Porsche 911 Technical Forum 11-14-2017, 01:00 AM
Replies: 6
Views: 697
Posted By chris_seven
Tadd, If you fit an RSR Style pedal box you...

Tadd,

If you fit an RSR Style pedal box you will have to cut the floor of the car and weld in a new section as the RSR Box keeps the Master Cylinders outside the passenger compartment.

The SCRS...
Forum: 911 Engine Rebuilding Forum 11-12-2017, 02:28 AM
Replies: 15
Views: 728
Posted By chris_seven
I am not sure that 'spun' bearings are the result...

I am not sure that 'spun' bearings are the result of low oil pressure.

It is much more likely that oil starvation is the cause or that the crush was incorrect.

Trying to compare pressure on a...
Forum: Porsche 911 Technical Forum 11-05-2017, 08:53 AM
Replies: 1
Views: 213
Posted By chris_seven
6082-t6

6082-t6
Forum: Porsche 911 Technical Forum 11-05-2017, 05:00 AM
Replies: 9
Views: 548
Posted By chris_seven
http://imagizer.imageshack.us/v2/xq90/924/24INo4.j...

http://imagizer.imageshack.us/v2/xq90/924/24INo4.jpg (https://imageshack.com/i/po24INo4j)

We have been making wooden gearknobs for a few years now.
...
Forum: Porsche 911 Technical Forum 11-03-2017, 12:19 PM
Replies: 9
Views: 781
Posted By chris_seven
You can buy the bearing tolerance rings that are...

You can buy the bearing tolerance rings that are used in differing lengths.

The stock length is around 14mm and they are designated AN15.

You can buy 8mm and 12mm and also 22mm if you wanted a...
Forum: 911 Engine Rebuilding Forum 10-31-2017, 11:17 AM
Replies: 7
Views: 527
Posted By chris_seven
There are 'gear' sections in the pump and any...

There are 'gear' sections in the pump and any damage to the gear teeth will be obvious and easy to identify.

If you also inspect the inner faces of the housing for any obvious scoring or marking...
Forum: 911 Engine Rebuilding Forum 10-31-2017, 09:33 AM
Replies: 14
Views: 808
Posted By chris_seven
We have fitted around 20 engines with these studs...

We have fitted around 20 engines with these studs and have no reported issues.

We only have enough studs for our own use at present although we are planning to make more.

The lower Young's...
Forum: 911 Engine Rebuilding Forum 10-31-2017, 04:02 AM
Replies: 14
Views: 808
Posted By chris_seven
Standard steel, Supertec, ARP and Raceware studs...

Standard steel, Supertec, ARP and Raceware studs all have a CoE of approximately 11 ppm per degK.

They all have a Young's Modulus of about 200GPa.

This means that for a given temperature the...
Forum: 911 Engine Rebuilding Forum 10-30-2017, 11:03 AM
Replies: 14
Views: 808
Posted By chris_seven
Also bear in mind that the 'stiffness' of the...

Also bear in mind that the 'stiffness' of the stud will significantly influence the force generated by expansion for a material with a given Coefficient of Expansion.

Studs with the largest shank...
Forum: Porsche 911 Technical Forum 10-30-2017, 10:51 AM
Replies: 3
Views: 317
Posted By chris_seven
Tom, The SWB drive flange suits a 94mm CV...

Tom,

The SWB drive flange suits a 94mm CV which has a 78mm PCD.

The 1969 CV is 108mm and I think that the PCD is 94mm.

The 1969 diff units we have seen are too wide to fit into a 901 casing...
Forum: 911 Engine Rebuilding Forum 10-27-2017, 02:22 AM
Replies: 157
Views: 16,522
Posted By chris_seven
https://www.cgstudio.com/3d-model/porsche-911-engi...

https://www.cgstudio.com/3d-model/porsche-911-engine-10822

This has been around for a while but doesn't look as good
Forum: Porsche 911 Technical Forum 10-26-2017, 12:41 AM
Replies: 18
Views: 4,298
Posted By chris_seven
Why bother ?

Why bother ?
Forum: Porsche 911 Technical Forum 10-24-2017, 01:46 PM
Replies: 19
Views: 1,113
Posted By chris_seven
Just calcuate the wheel rate due to a rubber bush...

Just calcuate the wheel rate due to a rubber bush that twists and a bush that slides is at the most 1%.

The calculation is very straightforward.

If you compare the modulus of a 60 ShoreA and an...
Forum: Porsche 911 Technical Forum 10-20-2017, 09:24 AM
Replies: 5
Views: 960
Posted By chris_seven
http://imagizer.imageshack.us/v2/xq90/923/fpm6eh.j...

http://imagizer.imageshack.us/v2/xq90/923/fpm6eh.jpg (https://imageshack.com/i/pnfpm6ehj)

This is a 1985 3.2 Carrera dash we are backdating and this is the first rough prototype.

We have drawn...
Forum: 911 Engine Rebuilding Forum 10-20-2017, 05:27 AM
Replies: 32
Views: 2,729
Posted By chris_seven
I don't really agree with this idea. The...

I don't really agree with this idea.

The basic steel making process used can be either a Basic Oxygen system or an Electric Arc both have a subtly different use.

EAF systems tend to be...
Showing results 1 to 25 of 500

 
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