Snorton74 said:1. It did not seize when I tried it first with just oil ,
and in the first try the valve was heated longer and the head was cold.
I'm surprised this obvious point could be lost on someone who's watched the video several times.
comnoz said:john robert bould said:Jim .
The valve appeared very hot..that gas flame looked very intence... enough to carbonize most oil. What temp would a inlet valve operate at? considering all the cold wet air passing over it.
I have no way of knowing the temp in a Norton, but for air cooled racing engines the intake valve head temp is commonly figured to be somewhere between 500F. and 800F. I would figure 400 to 500 for a normal Norton motor since the cylinder head itself commonly sees 400F.
When I tried the test the first time -before I got the camera out -I used an infrared temp gun and measured the intake valve head temp at about 500F. I don't know that this was real accurate. I measured it at the end of the first try with straight oil. I really didn't trust the temp gun for this so I didn't try to measure it any more. Jim
john robert bould said:Iim,
Your oil/Stp mix is more than 25%, look at the cup, you start with approx 1/4, then its 3/4's with the STP added?
john robert bould said:How do these "polymers" get onto the inlet valves,when seals are fitted?
boz said:I am really enjoying this post. Now for the trivia question for the day.
What does STP stand for?
boz said:I am really enjoying this post. Now for the trivia question for the day.
What does STP stand for?
hobot said:Scientifically Treated Petroleum - about a decade before the jet age arrived.
http://www.stp.com/stp-and-racing/stp-history
or
Suspicious Technical Propaganda
https://www.google.com/#q=stp+oil+dangers