I was just playing with some different combos and the 2 don't match:
The ZEALautoWORKS calculates that a Stock US H22 would be 9.89:1 while the BS Performance states 10.01:1
http://www.zealautowerks.com/hfseries.html
http://www.bsperformance.com/compcalc/compcalc.htm
Any insight??? Is it the difference between Effective and Static compression?

 

If you plug the same numbers into each calculator you will get the same result, at least in this case.

 

I am still getting the same numbers as before.....
I just did the H22A type S and came up with a difference also.
10.99:1 VS 10.85:1
Stock H23A1:
SAME
JDM H22A Pistons in H22A bottom end
10.60:1 VS 10.47:1
TypeS Pistons in H23 bottom end
11.47:1 VS 12.12:1
Weird.....I did it several times and keep getting the same results. I know its not much on these stock setups, but when you start doing Budget Stroker type setups theres more of a difference.
Anyone else?
Billy/117: If you try the ZEAL one it lists your setup as 11.02:1 with a 0.045" mill/deck job.


It has to be the difference between the Effective and static. When I tried the D series calculator on ZEAL it lists both the H/F calculator only has one type.
I should learn to stay away from these calculators......It caused confusion the last time as well.



Modified by :=:NirVTEC:=: at 12:43 PM 5/28/2007

 

Some of the numbers for the same H22 engine are different.

 

 

The specs between the two sites differ. Look at the piston to deck clearance and dome numbers for a stock H22 setup. They're not the same. If you put in the same specs, they should be close. The zeal calc appears to be a bit more accurate since it is taking into account rod length and comp height (if they indeed use these values in the CR calc). I'd have to play around with it some, but it should be relatively easy to figure out how each calculator is coming up with the CR numbers.

BTW, my head isn't milled 0.045".

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 117 &raquo;</TD></TR><TR><TD CLASS="quote">

BTW, my head isn't milled 0.045". </TD></TR></TABLE>

I just thought I remeber seeing 0.045" in a post from you somewhere.
Sorry for posting wrong info..... or is it a Either way, sorry dude.

 

No big deal, just thought I'd tell you.

It's around 0.035". The block has been decked a few thousandths, though.

Those dome numbers for the Type S pistons also look off. I measured more than that, but I need to re-do the measurements so I can make sure they're accurate.

Have you done a 5 lug swap on your 4Gen? I have 3 sets of brand new Kosei K1 wheels I want to sell. I figure you would appreciate them more since you're on the track a lot.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 117 &raquo;</TD></TR><TR><TD CLASS="quote">No big deal, just thought I'd tell you.

It's around 0.035". The block has been decked a few thousandths, though.

Those dome numbers for the Type S pistons also look off. I measured more than that, but I need to re-do the measurements so I can make sure they're accurate.</TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 117 &raquo;</TD></TR><TR><TD CLASS="quote">My block has been decked around 0.003" to 0.005", and the head was milled to get squish around 0.045" (it'll be different for every cylinder, unless you have the quench pads in the head machined to the same heigh...</TD></TR></TABLE>

I saw this and the number stuck in my head like glue.....Why? Because it was alot! I seem to remember the numbers but not the context sometimes...

It also seems like the MORE BASIC calculator almost works better.....
See what happens when I mess with these things Billy?!?! This is TWICE in a week now! Thanks though, I am just starting to get very curious about more details about internals. Going to be buying a junk motor to tinker with next winter for sure.

 

I milled to get squish around 0.045". That doesn't mean I milled the head 0.045". Squish is the clearance betwen the quench pads in the head and the quench pads on the pistons. Some call it squish, some call it quench clearance.

I'd say stop screwing with calculators and do the measurements yourself so they'll be accurate for your engine.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 117 &raquo;</TD></TR><TR><TD CLASS="quote">

I'd say stop screwing with calculators and do the measurements yourself so they'll be accurate for your engine.</TD></TR></TABLE>

Exactly why I want to buy a junk motor to play with next winter unless I start my project by then. After assembling my 1st motor, Im sure I will have a vast understanding of the calculations.....Numbers are my forte'.
Thanks Billy!

 

i have mentioned this before. alot of calulators that have incomplete data will just put 0.0 in for a value, I ran into this with the zeal calc before. now I will go back an read the thread