sicivic

Does anyone know what the diameter in mm of the stock throttle body on a 92-95 Si/Ex is?

MrDX

52mm... I'm trying to upload my ported one now.. it's a 58mm.


[Modified by MrDX, 12:46 AM 9/20/2001]

sicivic

Are you sure the 92-95 Civic Si/Ex stock throttle body is 52mm? My stock 89 Civic Si is 55mm.

MrDX

I'm almost 100% positive... cause the place I sent my t/b to get bored offered a 55mm-58mm bore, but they recommended a 58mm for that anything bigger than that becomes a waste unless you begin to bore out the intake manifold, replace it with a custom one, and make sure to have enough fuel to compensate for the extra air volume coming in.

MrDX

53.5mm Honda probably puts it at a 53mm to comply with emission standards. BTW here's my ported 58mm. It's 58mm tapered into 56mm to give a funnel effect on the air coming in, thus producing a ram air type airflow.


[Modified by MrDX, 12:08 PM 9/21/2001]


[Modified by MrDX, 12:08 PM 9/21/2001]


[Modified by MrDX, 12:12 PM 9/21/2001]