according to http://www.zealautowerks.com/ compression calculator. The B18C and B16B have a slightly different deck height than the B18B/B20B

Now from what I've read everywhere, I had come to the conclusion that all the B series deck height were the same EXCEPT the B16A and B17A which were shorter. But this site is saying other wise.

This plays havoc when trying to figure out compression ratios.

Can anyone confirm or deny this?

 

ttt

 

they are the same deck heights... well at least thats what I assumed....

hmmmm

 

They are different.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bunger &raquo;</TD></TR><TR><TD CLASS="quote">They are different.</TD></TR></TABLE>
no, all B18, B20, and B16B deck heights are the same
Only blocks that have a different deck height is the B16/B17

 

ENGINE DECK

B18C1 8.347
B18C5 8.347
B18A1 8.347
B18B1 8.347
B17A1 7.998
B16A3 7.998
B16A1-A2 7.998


Modified by Mazda 3 Racer at 2:48 PM 2/17/2006

 

8.347 it is

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mazda 3 Racer &raquo;</TD></TR><TR><TD CLASS="quote">ENGINE DECK

B18C1 8.347
B18C5 8.347
B18A1 8.347
B18B1 8.347
B17A1 7.998
B16A3 7.998
B16A1-A2 7.998


Modified by Mazda 3 Racer at 2:48 PM 2/17/2006</TD></TR></TABLE>

Where did you source your information? My source that the deck heights are different is VERY reliable...

But yes, B17A and B16A are the same, B18A/B and B20B/Z are the same and then B18C and B16B are the same... BUT the B18C/B16B deck height is slightly taller than the B18A/ETC.

 

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

If this were the case, then how come B18B/B20 timing belts are the same length as B16B/B18C belts.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92TypeR &raquo;</TD></TR><TR><TD CLASS="quote">

If this were the case, then how come B18B/B20 timing belts are the same length as B16B/B18C belts.</TD></TR></TABLE>

Water pump gear sizing is different, that makes up the difference.

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

Where did you source your information? My source that the deck heights are different is VERY reliable...

</TD></TR></TABLE>

I have sleeved over 3000 blocks, I know my info to be accurate!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mazda 3 Racer &raquo;</TD></TR><TR><TD CLASS="quote">


I have sleeved over 3000 blocks, I know my info to be accurate! </TD></TR></TABLE>

 

lol

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mazda 3 Racer &raquo;</TD></TR><TR><TD CLASS="quote">

I have sleeved over 3000 blocks, I know my info to be accurate! </TD></TR></TABLE>

i was waiting for that

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mazda 3 Racer &raquo;</TD></TR><TR><TD CLASS="quote">

Water pump gear sizing is different, that makes up the difference.

I have sleeved over 3000 blocks, I know my info to be accurate! </TD></TR></TABLE>

If the timing belts are the same length, and the water pump gear sizing is different, whats the difference you're talking about?

If you are truely right, then I stand corrected, do you mind explaining when in the sleeving process you check deck height? I assume you use a CNC mill to cut out the old sleeve, is it in the setup of this process that you check deck height?

 

The sleeving process that I designed locates off the center of the main tunnel. The cutting process requires tools to be offset from the top of the block, therefore knowing that the deck height is one of the most critical dimensions for sleeving!

As far as the timing belt, when you have the same deck heights and two different length belts, you have to make up the difference somewhere, then the water pump gear makes up the difference. The B18C uses a longer belt because it has a 22 tooth water pump gear. The LS uses a shorter belt because it uses a 19 tooth water pump gear. Same deck height, different belt lengths, different water pumps.

FYI - all VTEC B-series use the same water pump - 22 tooth. ( B18C, B16A )
All non-vtec B-series use a 19 tooth water pump! ( B18A/B , B20 )

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mazda 3 Racer &raquo;</TD></TR><TR><TD CLASS="quote">The sleeving process that I designed locates off the center of the main tunnel. The cutting process requires tools to be offset from the top of the block, therefore knowing that the deck height is one of the most critical dimensions for sleeving! </TD></TR></TABLE>

Just to clarify, the cutting process is located by starting from the center of the main tunnel (where the crank lives), then offset by a known number (8.347 in case of b18a) to acquire the location of the top of the block? I just want to end this debate for once and for all, as the way you worded it is a little confusing.

I had been so adamant in my belief they were different because I had been told so by 2 or 3 very well known engine builders and also found it to be true when taking my own measurements. I even went as far as measuring the block itself, and by measuring each piece separately (stroke, rod length, compression height and piston to deck height).

I'm not unyielding in my beliefs, I just want to know the truth.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mazda 3 Racer &raquo;</TD></TR><TR><TD CLASS="quote">As far as the timing belt, when you have the same deck heights and two different length belts, you have to make up the difference somewhere, then the water pump gear makes up the difference. The B18C uses a longer belt because it has a 22 tooth water pump gear. The LS uses a shorter belt because it uses a 19 tooth water pump gear. Same deck height, different belt lengths, different water pumps. </TD></TR></TABLE>

Ok, this is what I thought, but was confused by this:

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92TypeR &raquo;</TD></TR><TR><TD CLASS="quote">If this were the case, then how come B18B/B20 timing belts are the same length as B16B/B18C belts.</TD></TR></TABLE>

 

i just find it crazy that there is no hard proof one way or another....considering how long the motors have been around, how popular they are and how often they are built.

 

Soooo, bumping this really old thread. Why is there still mixed information on what the deck height is on the b18c/b18a b blocks? All the piston manufacturers say they're 212mm. The compression calculators say 211.89-212.39. Is there anybody else who has actually measured either of these blocks themselves?

 

 

Could someone else that has either measured their block or sleeved a block chime in?

 

Why? This is the guy who designed and started golden eagle sleeves. Is his info not credible?

 

Too much interweb reading. That infirmation is accurate enogh ti build on without issue..

Find horse...Will beat to death.

 

Old thread but poorly explained: Very simple:
ALL B18-B20 decks regardless of VTEC or not: 8.347"
B16B (CTR) is a destroked B18C. Deck: 8.347"
ALL other B series (B16A-B17A) decks: 7.998"

 

I have measured stock B18 and B20 blocks between 8.3402" and 8.3618"... most B18A/B and B20B/Z blocks were closer to 8.3402 and B18C1/5 as well as B16B blocks were typically slightly taller.

 

So since B18B and B18C blocks are within .02 inches with each other, is it negligible, and won’t make any difference other than if using very high compression pistons? So could someone swap the crankshaft and rods from a B18B and B18C, for example?