I know JDM ITR blocks are stamped with B18C on the top line followed by numbers on the bottom line...but how are you suppose to know for sure its a JDM ITR block, not JDM GSR (SiR) block? Imagine there is no head on the block, or are the blocks the same for both models? (i would have thought ITR would have higher CR pistons, lighter crank etc)


Thanks

 

what are the pistons stamped?

 

The GSR and ITR blocks are Identical. The ITR crank Is actually heavyer due to its larger counter weights. GSR and ITR use the SAME rods, so they will both be stamped p72. The pistons however will have unique codes and this is where you can see the difference. Again, same block for either, so hopefully that answers your question.

 

i wouldnt no....im looking at buying a 'JDM' ITR and just want to make sure the block is JDM ITR (In australia here, some people do dodgeys by wacking on GSR blocks and try to pass it as Type R). I can tell the head, just unsure of the block.

 

Thank you! so its almost impossible to tell without looking at the internals?

 

Pretty Much. The stamps on the pistons is what you need to see.

 

hmmm fair enough...what about under the oil pan..or anything under the car?

 

If it's stock and has the tranny still mounted, it might still have the engine stiffener:

 

lol this thread is funny. So your telling me it really matters to you that the specific block was "intented" to be in an ITR? Becuase the blocks are THE SAME, whos to say that gsr and itr blocks are interchanged all the time during the manufacturing process. If the block says b18c its an ITR/GSR block. Its irrelevent if all your talking is just the block.

 

Not so, although ITR and GS-R blocks are the same block, the "best" GS-R blocks are designated as ITR blocks for more upgrads... http://en.wikipedia.org/wiki/Honda_B_engine
http://www.itrsport.com/technical.html 94

 

lol. How do they decide between two blocks that are "the same" of which is better? I would assume the only critera for this would be for clearances on the mains, rods, etc. either way, still same block at end of day.

 

It's like pr3 b16 heads, yes itr heads or stamped pr3 but there set aside because they have a perfect cast. These heads that have been set aside will become itr heads. And the same goes for gsr blocks yes they are the same but the cast is not as perfect as an itr block.

In the end it all comes down to the owners opinion because there the ones driving it. Just my .02

 

What DC4 Rasta said^^^.94

 

alright thanks

 

they don't anyone can add info to wiki, that's complete bullshit, it's the same part number

clearances, cranks and whatnot are different, it's just the block casting that is identical. as noted above the rods, oil pump and oil pan are all p72. even the itr block has p72 cast into it

 

this isn't true either. itr heads are pr3 castings that are cnc bowl ported, how perfect the casting is doesn't even really matter since it's getting cnc'd

 

good info

 

btw itr rods have an R stamped on them and they are stronger than gsr rods.. p73 pistons are itr block p72 are gsr..

 

you know, i've glanced at a usdm itr rod from the side and noticed the R, however i didn't actually pay that close of attention to tell if it was was a P72 rod that was just worked, balanced or otherwise designated for the itr. the jdm itr on the other hand does have p72 on the rod caps but i have never seen one from the side. anyone ever tear both engines apart ?

 

the connecting rods are different BUT they use p72 rod caps.

 

As I was reading this, I was waiting for someone to say this...

To the OP:
If you are looking at a bare empty block, SiR-G and ITR are the same. If it's a complete short-block assembly, the pistons, rods (not rod caps), crank and block brace will be P73.

If your talking about a short block with external accessories, a nifty way to tell is by the black breather canister on the back of the block. No two B series motors use the same canister. When it comes to telling the 1.8L canisters apart, the GSR canister has two different sized holes in the top. The larger of the two holes is where the PCV valve directly plugs into. On the Type R, this canister has two holes of the same size with two rubber hoses running out of it (The Type R has the PCV valve on the intake manifold).

The Type R canister still says 72 on it just to keep things extra confusing.

I know this for a fact because I just replaced my B18C-r canister and tried fitting a B16 one I got cheap. All the vacuum holes were correct for my R, but NONE of the bolt holes matched up. That's when I did some research and found the GSR was even more different than the other two.