what size is the d16z6, b18b, and b18c1 throttle bodies?

 

I heard mixed results. One day, I'm going to measure them myself and make everyone shut up.

D16 - anywhere from 55-58mm (?)
B16a2/B18c1 - 60mm
B18c5 - 62mm

I heard the LS (B18b) was also 60mm but now I am not so sure

 

My D16Y8 TB(for sale, check sig) starts out at 58mm and tapers to 55mm at the throttle plate. My GSR TB starts out at around 62mm, I think, and tapers to 60mm.

 

How you like the GSR TB? Did you port match the manifold?

 

It's cool. I can't really say I feel much of a difference, except in the upper RPM range. Yes, I port matched the IM. Took a while to open it up as much as I needed to. I don't have a compressor, so I used my Dremel with straight/cone cutting bits, then moved to straight/cone grinding bits, then to coarse sanding drum, then to fine sanding drum. I used the GSR TB gasket as a template.

 

Cool, I was going to get a B-series throttlebody as well.

 

Is it true that most honda TB's are interchangable? For example a B series Tb on a D series engine? Or has that been what you guys are talking about?

ronin

 

I'm running a GSR tb on my D16Y8. They're pretty much interchangable, but it's easier to get one that's from the same OBD generation as your engine.

 

does anyone know for sure if the ls and the gsr is the same size?