Besides the intake manifold, what are the differences between the GSR and Type-R? I'm considering this on my '96 jdm b18c. Obd1 P72 Hondata. Would the Type-R cam go in, or what parts? Different head?

Thanks

 

Type R has a different crank and pistons that I know for sure. I believe the pulley is also different. The head I was told was a B16 head with .5mm ported intake valves. That was something some people agree with and other people say its just a B16 head. And then obviously the cams also are different. And type R has dual valve springs on intake and exhaust as opposed to just intake valves. To my knowledge those are all of the main differences. I could be forgetting a few things honestly I kind of think I am to be honest

 

Clarifications are in bold.

 

... can't say I'm surprised. A lot of differences.

 

Hey man can you clarify the head porting difference for me? cause I feel like everywhere I go to find a clear answer I end up finding conflicting answers. I hear either they're.5mm over on intake side, they're ported to flow better (or however you worded it exactly because I have heard that before) or that they're exactly the same and a Type R is simply a GSR block with B16 head. Im just curious because like I said I always get conflicting answers and I just really wanna know exactly what the difference is. Thank you in advance

 

Clarification:

Valves are the same size. ITR valves are NOT .5mm over sized. The ITR intake valve stem neck close to the valve face is thinner in diameter for increased air flow compared to a stock B16A valve. In the aftermarket, this valve modification is typically referred to as a "Pro Flow" design. Also, in the ITR cylinder head, you have hand porting near the valve opening in the chamber. The bulk of the work is on the short turn radius: reducing the angle of this turn creates more flow and less turbulence at the valve. The valve seat cut is also different.

A B16A and a ITR cylinder head both start out as stock PR3 (30) head castings... from there, the B16A gets parts installed and the ITR gets porting and upgraded valves, springs and cams. Now, can you port a B16A head and add upgraded valves, springs and cams ??? Sure... and this would work more like an ITR head... but it didn't come from the factory that way.

So to clarify a bit more... if you install a stock B16A cylinder head casting with ITR valves, springs and cams, it still will NOT make as much HP as a true complete ITR head on whatever block you choose... this idea that a GSR block with a B16A head will be the same as an ITR is total crap.

 

And a little more clarification

- The difference between the P72 rod and the P73 rod is in the bolts only. The ITR rod bolts have dimples for being installed by stretch method, it's unclear if they were of a different material or not. The rods themselves are exactly the same except for an "R" marking on them.
- Crankshaft counterweights are larger on P73 cranks.
- Fuel pressure regulator is different - ITR/CTR spec is 3.5bar instead of 3bar.

 

I am sure what you mean here is that a GSR and Type R connecting rod are dimensionally the same. With original engine parts, in addition to the differences you described above, the ITR connecting rods would be stamped with a two-digit bearing code whereas the GSR rod would have a single-digit bearing code identifier. Interestingly, today Acura uses the same part number for either application, so it would be enlightening to see what specifics are on the rod you get today if you ordered one... a dimpled stretch bolt or not, one or two bearing code digits, and with/without an "R" cast in the rod beam.