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Okay here's where I get lost

B16B(CTR) is a B18C block!
Any other differences?
Are bare B16b,B18C1 blocks, B18C5 blocks the same?

B16B has same Bore but shorter stroke than a B18C
Does it just use shorter rods or a different crank too?

What do B18b's and B18C5's share?
Head
Cams
Intake Manifold
Valvetrain
Pistons(I don't think so)
throttle body
crank

So, if you took a B18C1 or 5 block, ITR head/valvetrain, CTR pistons/rods,ITR intake manifold,ITR throttle body,GSR crank. Would you have an exact replica of a B16B.

Sorry to sound like a NEWB, but I own a LUDE. I just had some confusion about this more for my friends sake. He was trying to bet me that B16a and B16b blocks were the same, and could make a B16B spec engine out of a B16a with ITR parts alone. So far I've found that a B16a block is 7mm smaller than a B16b block.
 

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Yes, the CTR uses the B18C block with different rods and pistons. Not sure if it uses a different crank though.

The two R heads are basically the same except the CTR intake cam is 3 degrees longer duration, exhaust cams are the same.

CTR pistons have a much higher dome. Putting CTR pistons in a B18C5 yields about 12:1 compression.

So, if you took a B18C1 or 5 block, ITR head/valvetrain, CTR pistons/rods,ITR intake manifold,ITR throttle body,GSR crank. Would you have an exact replica of a B16B.
Yeah, you could do that, but it would be cheaper/easier to just buy the CTR engine if you are starting from scratch.
 

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Basically, the bore on the block between the B18 and the B16b is the same, but the stroke is very different. The rods are the same length, although the B16 rods are 3mm thinner on the wrist pin side. The main difference between the B16 and the B18 is in the crank, the larger crank on the B18 accounts for the longer stroke. As far as the pistons go, the B16b pistons are a higher dome than the ITR's, in fact there are more like the B16a pistons than the ITR's, only they are .25 over. Daremo was totally right about the differences with the cams, but the head on the CTR is actually ported a little bit more aggressively than the ITR. Intake manifold, throttle body, fuel rail and headers are all the same within the JDM ITR and CTR. Your best bet to building a CTR replica that is comp is actually to put a ITR head on a B16a block and then drop in ITR pistons. The lower wrist pin mount on the ITR piston in comparison to the standard B16a and CTR piston will actually yield approx 12.5:1 compression. Then you can just use the ITR intake manifold, headers, fuel rail...etc.
 
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