ok i read this

"The Piston Deck Height is the distance the piston EDGE is in relation to the top of the cylinder deck. NOTE: This distance can be negative (the piston edge is recessed in the cylinder deck) or positive (the piston edge is sitting above the cylinder deck). Please remember... we are talking about the relationship of the EDGE of the piston not the center. Of course, if the piston is of flat-top design then the edge and the center will be the same."

but that makes no sense, if that were true then the deck height would change whenever you had different pistons.....can someone please explain to me how deck height is calculated

 

yes, compression height changes if the piston is different, for example, pr3, p73 and pct's all have different piston to deck heights.pct being the highest one.
read this:
http://www.2strokeheads.com/Deck%20Height.html

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mmuller &raquo;</TD></TR><TR><TD CLASS="quote">yes, compression height changes if the piston is different, for example, pr3, p73 and pct's all have different piston to deck heights.pct being the highest one.
read this:
http://www.2strokeheads.com/Deck%20Height.html</TD></TR></TABLE>

thats where i got this from, but what i am saying is that if the CTR has a deck height of 270mm and a b16a has a deck height of 263mm, when you put CTR pistons in the B16a does the deck height increase? (that is what the site is saying basically)

 

this is the piston deck height, not the block deck height, the only time the block deck height is changed is through deck milling or plating. however the piston deck height changes everytime the pistons change, it is the difference between the height of the piston and the deck height. this is important in determining you comperssion.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by thad &raquo;</TD></TR><TR><TD CLASS="quote">this is the piston deck height, not the block deck height, the only time the block deck height is changed is through deck milling or plating. however the piston deck height changes everytime the pistons change, it is the difference between the height of the piston and the deck height. this is important in determining you comperssion.</TD></TR></TABLE>

i am talking about the block deck height, how is it computed?

 

Ohhhhh, you are talking about block deck height, i.e. you are asking has the top of my block been "milled", "shaved", or "decked"? That is a completely different thing. I thought there was a tab or something near the top of the block so you could measure with a regular set of calipers but I'm not sure where it is. It might be from the centerline of the crank journals to the top of the block. Call a machine shop and they might be able to tell you if no one here knows.

 

i am talking about the block deck height, the B16a deck height is 263mm and the B16b deck height is 270mm HOW are those numbers calculated?

 

to add, that site link above talks about piston DOME height not the deck height, i want to know how the deck height of a block is calculated

 

the deck height of a block is not calculated it is measured from the bottom of the main seal to the deck, a b18c has it's deck 270mm from the oil pan sealing surface. piston to deck height is what you reffering to in your first post.
be patient i'm trying to help you.

 

im pretty sure deck height is measured from the main caps to ther top

 

the bottom of the caps line up with the main seal / oil pan sealing surface it you took the studs out of the block and took off the caps it would sit flush on the floor then you measure up from there.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by thad &raquo;</TD></TR><TR><TD CLASS="quote">the deck height of a block is not calculated it is measured from the bottom of the main seal to the deck, a b18c has it's deck 270mm from the oil pan sealing surface. piston to deck height is what you reffering to in your first post.
be patient i'm trying to help you.</TD></TR></TABLE>


thank you so much, its something i have wondered for a while but just never really thought about it

 

Don't confuse DECK HEIGHT with COMPRESSION HEIGHT.Compression height is the distance from the centerline of the wrist pin to the quench area of the piston (top flat area).

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NJIN BUILDR &raquo;</TD></TR><TR><TD CLASS="quote">Don't confuse DECK HEIGHT with COMPRESSION HEIGHT.Compression height is the distance from the centerline of the wrist pin to the quench area of the piston (top flat area).</TD></TR></TABLE>


hmmm.........so the thing i am referring to is the deck height or compression area?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by temp &raquo;</TD></TR><TR><TD CLASS="quote">


hmmm.........so the thing i am referring to is the deck height or compression area?</TD></TR></TABLE>

you are refering to deck height, compression height or piston to deck height is the explanation that you stated above

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mmuller &raquo;</TD></TR><TR><TD CLASS="quote">

you are refering to deck height, compression height or piston to deck height is the explanation that you stated above</TD></TR></TABLE>


ok cool, thanks a lot you guys