What's a good brand of O rings?

[Ross365]

Some parts of NASA realised that the booster joint design was very poor after the very first ground test firing, which was ~10 years before Challenger blew up. It had to do with the way the joint flexed under pressure; it behaved exactly the opposite way to that which they had expected and leaving the rings very vulnerable to burning. They used it any way, lacking money and time to sort it.

After the, explosion, they redesigned the joint, though still using similar O rings. The same shuttle booster will be used on NASA's upcoming new manned rocket if/when that ever happens.

 

[mike os]

O tings are used extensively in this kind of thing. Perfectly good seal if designed specified and installed correctly... useless if you get it wrong

 

[premmington]

For automotive applications - I just buy dealer parts (orings). The fit out of the packet.

There are so many types and sizes of o rings it is unreal....

 

[Ross365]

For automotive applications - I just buy dealer parts (orings). The fit out of the packet.

There are so many types and sizes of o rings it is unreal....

But, I've got two 20 year old cars where proper spares are already getting hard to get. There are lots of materials compatibility tables on the net. I would like one of those conical shaped gadgets that give you a good measurement of O ring i.d. !

 

[premmington]

But, I've got two 20 year old cars where proper spares are already getting hard to get. There are lots of materials compatibility tables on the net. I would like one of those conical shaped gadgets that give you a good measurement of O ring i.d. !

I want one of those - like a jewelers ring gauge...?

Problem is - you will be measuring old flat O rings for size. Not new compatible ones of the correct size...

 

[premmington]

No problem with that as the customer is paying. I have 3 or 4 boxes of O rings - from the usual, common sizes in imperial and metric and a couple of boxes with tinier O rings. The two normal sets came from my local bearing and belt supplier many years ago. They have me cost peanuts in the long term, but were a bit of an initial expense back then.

Your quote "No problem with that as the customer is paying."

It is me who is paying if there any leaks after I have worked on the paying customers car...

"Right first time..."

 

[bricol]

Your quote "No problem with that as the customer is paying."

It is me who is paying if there any leaks after I have worked on the paying customers car...

Which is exactly why you don't want years old stock - they age even under ideal storage conditions - yes, I know someone will have a box of them they've had for 50 yrs . . .

 

[premmington]

Which is exactly why you don't want years old stock - they age even under ideal storage conditions - yes, I know someone will have a box of them they've had for 50 yrs . . .

I got a cupboard of them - all in little part numbered packets - asst' boxes with special plastic holders - tubs with endless green and purple ones for aircon jobs.

\i got more Orings than any man should have. But I never find the right one from all the old ones when I need one it a hurry!

 

[Keithmac]

For automotive applications - I just buy dealer parts (orings). The fit out of the packet.

There are so many types and sizes of o rings it is unreal....

Same with Motorcycles, very rarely is an O ring a standard size and if it's buried inside the engine why risk cobbling it together to save a few quid..

£5 for one O ring vs a days work if it goes wrong.

 

[Keithmac]

Finally got round to the ABS delete.

All hard lines and modules / servos removed.

Had to strip the ABS loom down as it runs some wiring for the starter etc (managed to bin 75% of it).

Hel brake lines fitted with original Master Cylinders and Calipers.

Probably £3000 of kit on the floor, all went in the bin where it belongs!.

 

[bricol]

If you did that on a road car that had it fitted, I'm not sure it would then pass a properly done MOT.

I actually added ABS to my car . . .

 

[Keithmac]

The system completely detaches hydraulically the master cylinder from the calipers over 5mph.

This is all well and good when it works but pretty bad when it doesn't.

Honda only made their own system for 3 years iirc then went over to Bosch or Ate for the next generation Fireblade which is quite telling really..

This bike came from factory as two versions so basically it's been converted to the cheaper, more reliable variant.

 

[bricol]

The system completely detaches hydraulically the master cylinder from the calipers over 5mph.

This is all well and good when it works but pretty bad when it doesn't.

Honda only made their own system for 3 years iirc then went over to Bosch or Ate for the next generation Fireblade which is quite telling really..

This bike came from factory as two versions so basically it's been converted to the cheaper, more reliable variant.

Ah - that sounds okay.

Mine is simply the reverse - having experienced ABS on an earlier version, I wanted it on the newer car - one second hand system later. A very good system - rarely triggers. Slight let down in that a sensor failure does cause the system to fight you - it won't let you depress the pedal! Only one failure in 30 yrs though.

 

[barracuda816]

I have been looking at this for a while but with so many different types I have never invested in any set. I thought Viton was a good catch all but im not sure. If someone could give a run down of what would be good for what that would be very useful info.

Something like

NBR:
Viton: Oil/fuel systems?
HNBR: Air con systems
Silicone:
EPDM: