How to measure poppet valve spring pressure

[eviltwin]

How do you measure poppet valve spring pressure in regard to fuel systems? Is there a tool?

Thanks!

[garry-in-michigan]

I used a postal scale, long gone. When needed, I borrow my sisters scale. She got it to measure portions in one of her weight loss diets. It says "Polder®" on the front and "not legal for trade" on the bottom.

[mr-asa]

If you have some fishing weights and a set of decent calipers, you could use Hooke’s Law to find the spring pressure

[eviltwin]

Thanks for the replies.
Hmmmm. A little confusing to me. I see how to measure and adjust the height using a drill bit. The only way I can think of doing the pressure is with the poppet out put desired weight on it and see if it moves desired distance. To do that, I would have the spring and poppet assembly upside down and just place the weight on it and see if it moves the desired distance. But I would have to account for the weight of the poppet. Or should I rig up some method of blowing air against the poppet and a ‘seat’ made of tubing and somehow measure pressure. There must be a simple way that I am just not seeing. Maybe I will adjust the height and hope for the best with the pressure, unless the spring has been bent it would not have changed much, no?
Again, thanks for your replies.

[Tubs]

A "Boathouse Repair" is one that done without having tools or the skills to do it properly.

• This reply was modified 6 years, 6 months ago by Tubs.
• This reply was modified 4 years, 2 months ago by Tubs.

[eviltwin]

Wait a minute, I was looking at pics of it and had an epiphany. I see the brass base of the poppet that is used to prime it sticks out the bottom. I could press that against a small food scale without bottoming it out and get a reading, no? What confused me was I was thinking of a pull or hanging scale, not one that could be pressed against.

[skeg]

I know that some of the members of the RBM chapters use pressure on scales to measure and perhaps they will share their methodology.
Skeg

[Tubs]

A "Boathouse Repair" is one that done without having tools or the skills to do it properly.

• This reply was modified 6 years, 6 months ago by Tubs.
• This reply was modified 4 years, 2 months ago by Tubs.

[eviltwin]

Tubs! That is a really clear reply, Thanks! Hope you didn’t do the pics just for me. But it applies to many models and will help others I am sure. I will post back when I get it done, hopefully this weekend. Well done sir!

[Author]

Posts