Hi, very interesting ... I have a couple of clarifications to ask: 1. Min 19:22: why did you chose 20 mm as down fill distance, is it empirical value based on experience? 2. Min 28:35: the plastic cover is also placed into the head recess? Thank you a lot.
I use 20 mm to be sure that the compression lump on the piston will be well below the top of the barrel. You can use any down fill dimension that you want. Yes on the 2.0L heads the barrel is recessed into the cylinder head. So when you take a chamber reading you need to have your cover at the same height that the barrel top will sit to get an accurate number. On the 2.2L and up engines the barrel and head design changed. The barrel on those heads sits flush against the sealing surface. Thanks for watching Kurt
@@klassikats thanks a lot for your answer and for posting your video, we are rebuilding the 2.7 911/83 of our 1974 Euro Carrera, we would like to do things right :) ...
Wow! I’ve read about this but never seen it done before. I’m rebuilding a 911 2-liter racing engine (with a 1-mm overbore) and would like to try this. I think I need to invest in a height gauge, I’m not sure the measurements can be done accurately with hand tools. Also, the plastic disc with the recess, I’m not sure how to make that. Will need to think about that. Very cool video!
Rob, yes you do need good quality tools to take accurate measurements. When it comes to the plastic discs we use, we make those in house. let us know if you cannot find someone to make one for you and we could cut one for you. Thanks For watching Kurt
@@robhurley5258 I had trouble finding a 300mm scale I liked too. This one on amazon looks ok too. amzn.to/3dUcQfx What you are looking for is one that is big enough, not 6" 150mm, and the digital helps. A heavy base is good too. I also got a flat stone to help with accuracy. amzn.to/3oYCh6c
Deck height is the relationship between the piston top and the cylinder head sealing surface of the barrel. This can be either a positive or negative number. Kurt
![Don't Skip This CRUCIAL Engine Check! | Piston Deck Height [#TECHTALK]](http://i.ytimg.com/vi/rOBjzxAYNc8/mqdefault.jpg)
This is the guy I want to rebuild my 2.7, he knows his stuff.
Thanks,
Kurt
Hi, very interesting ... I have a couple of clarifications to ask:
1. Min 19:22: why did you chose 20 mm as down fill distance, is it empirical value based on experience?
2. Min 28:35: the plastic cover is also placed into the head recess?
Thank you a lot.
I use 20 mm to be sure that the compression lump on the piston will be well below the top of the barrel. You can use any down fill dimension that you want.
Yes on the 2.0L heads the barrel is recessed into the cylinder head. So when you take a chamber reading you need to have your cover at the same height that the barrel top will sit to get an accurate number. On the 2.2L and up engines the barrel and head design changed. The barrel on those heads sits flush against the sealing surface.
Thanks for watching
Kurt
@@klassikats thanks a lot for your answer and for posting your video, we are rebuilding the 2.7 911/83 of our 1974 Euro Carrera, we would like to do things right :) ...
Wow! I’ve read about this but never seen it done before. I’m rebuilding a 911 2-liter racing engine (with a 1-mm overbore) and would like to try this. I think I need to invest in a height gauge, I’m not sure the measurements can be done accurately with hand tools. Also, the plastic disc with the recess, I’m not sure how to make that. Will need to think about that. Very cool video!
Rob, yes you do need good quality tools to take accurate measurements. When it comes to the plastic discs we use, we make those in house. let us know if you cannot find someone to make one for you and we could cut one for you.
Thanks For watching
Kurt
@@klassikats thanks Kurt. What model height gauge are you using?
@@robhurley5258 I had trouble finding a 300mm scale I liked too. This one on amazon looks ok too. amzn.to/3dUcQfx
What you are looking for is one that is big enough, not 6" 150mm, and the digital helps. A heavy base is good too. I also got a flat stone to help with accuracy.
amzn.to/3oYCh6c
@@klassikats thanks Kurt
Now calculate dynamic compression😅
Sure we can do that in another video
Kurt
Deck height .99mm? Ive always measured from center crank to the top of block
Deck height is the relationship between the piston top and the cylinder head sealing surface of the barrel. This can be either a positive or negative number.
Kurt