I'm working on helping out a friend of mine who is building a B16. He put ITR pistons in the motor, and when he turns it over with the head off, the pistons are sticking out of the top of the block.

He told me that he is using the factory B16 crank and rods. Any ideas as to whats going on? He wants to try and fix it by using a thicker headgasket, although I would say that's not a very good way to solve the problem

I'm just trying to get a little more information on what could have gone wrong.

 

B16A or B16B ? A B16B crank and rods will make the piston come out the top of the block.

If he is using a B16A crank and rods, why did he choose an ITR piston? that will yield a lower compression.

 

Read the title, I said b16a2.
I have no idea, and honestly I didn't know that. What will the difference in compression be?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ricochet. &raquo;</TD></TR><TR><TD CLASS="quote">Read the title, I said b16a2.
I have no idea, and honestly I didn't know that. What will the difference in compression be?</TD></TR></TABLE>

you stated:<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ricochet. &raquo;</TD></TR><TR><TD CLASS="quote">he is using the factory B16 crank and rods.</TD></TR></TABLE>
This means nothing!! There is a difference in cranks and rods between the two. I am trying to help you out with your situaiton! Assuming he is using a B16A crank AND B16A rods there should not be any problems with the ITR piston coming out. Installing ITR piston into a B16A will lower the comp. due to the smaller dome one the piston. A B16A2 piston is bigger than that of an ITR (US) thus the smaller dome piston will lower the compression.

The compression height of the ITR and the B16A piston is 1.181.
Sounds like he does not have a factory B16A crank or B16A rods.

 

So how does an itr have 11:1 compression and a b16a2 have 10.2:1 (or is it 10.4, either way, I mean it's lower than an itr)? And are you saying an itr piston is taller than a b16a2 one? What rods will he need to be flush with the deck?

 

ITR has a 87.2mm stroke while the b16 has a 77.4mm stroke. Its true, using an ITR piston in a b16 would lower compression. Use the PCT or Civic Type R piston that will raise the compression.

 

B18C5's = B16B's Deck height is larger than the B16A.

The stroke is longer
B18C5 stroke=87.2mm
B16A stroke=77mm

The rods I believe are longer which is why you cant put them in a B16A block

B16A pistons yield a higher compression due to their PDD
PR3(B16A) PDD is 6.01cc
P73-A0(B18C5 USDM) PDD is 3.64cc

 

If the itr pistons supposedly lower compression, that means they would actually fit though.. These just stick up out of the block.

Well, is there anything he can do? Or should he just put the stock pistons back in?

 

pr3 pistons and p73's do NOT have the same compression height.
pr3= 1.180"
p73= 1.190"
even then piston to deck height should be arond .01
is the block decked?
are you sure he's not using pct( civic type r) pistons? since with pct's the piston will stick out of the block .01; since compression height is 1.210''

 

ok, how far do they stick up out of the block?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mmuller &raquo;</TD></TR><TR><TD CLASS="quote">pr3 pistons and p73's do NOT have the same compression height.
pr3= 1.180"
p73= 1.190"
</TD></TR></TABLE>

That is correct I took the CH for a B18C1 and not the ITR. The correct CH on the ITR piston is 1.195.

When you say it is sticking out of the block, how far do you mean?

 

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

When you say it is sticking out of the block, how far do you mean?
</TD></TR></TABLE>

.01 with pct's

 

how far is Ricochet. pistons sticking out......

 

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

how far is Ricochet. pistons sticking out......</TD></TR></TABLE>

oh lol.
may i ask you where you got that compression height of 1.195 from?