- Thread starter Turbo
- Start date
keithski122
Member
- Messages
- 2,081
Quite possibly, this was homemade though, worked well though.
So I went out to the shed to look at any schrader valves I had. I had a few car ones with a red seal and it took roughly 750 grammes of pressure to open it.
I remembered I had some brass plumbing fittings with schrader valves and they had a black seal and it took 350g to open them.
The brass fittings looked very suitable to be inserted into the tester fittings so I took out the tester to see how easy it would be.
Only to discover there was already a schrader valve fitted!
Not easy to remove it for testing but luckily the valve in the push in rubber adaptor was easy to remove.
Testing it gave a figure around 80g so 1/10 of the opening pressure of a standard tyre schrader valve. It had a blue seal.
The recommended valve from snap on has a white seal but I'm not sure if the seal colour indicates the opening pressure.
All this means that my tester is giving low figures even with a schrader valve fitted!
I remembered I had some brass plumbing fittings with schrader valves and they had a black seal and it took 350g to open them.
The brass fittings looked very suitable to be inserted into the tester fittings so I took out the tester to see how easy it would be.
Only to discover there was already a schrader valve fitted!
Not easy to remove it for testing but luckily the valve in the push in rubber adaptor was easy to remove.
Testing it gave a figure around 80g so 1/10 of the opening pressure of a standard tyre schrader valve. It had a blue seal.
The recommended valve from snap on has a white seal but I'm not sure if the seal colour indicates the opening pressure.
All this means that my tester is giving low figures even with a schrader valve fitted!
JOEPRO
Member
- Messages
- 5,403
- Location
- UK
All this means that my tester is giving low figures even with a schrader valve fitted!
As you know I went 2 stroke mad for a whole there and repaired/ rebuilt around 30 Stihl engines. At first I had weird compression readings. It was just a poor quality tester so I threw it out and spent a little more on a good quality compression tester good used. (Came off a Snap On truck so seller said)
No more second guessing. Accurate compression readings. Nothing more to it. Just get a quality compression tester.
