Y-pipe And Ast?...what?
#1
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Y-pipe And Ast?...what?
I am in the process of buying a 95 RX-7Beast. Can anyone tell me what in the "Blue Hell" a Y-Pipe does? And what the AST is used for and WHY does or need to be removed? All inquiries welcome.....Nap 2002.
#2
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>>Can anyone tell me what in the "Blue Hell" a Y-Pipe does? <<
The "Y" pipe ia a Y shaped pipe that collects the intake air from the two turbos and feeds into the intecooler. the early version had a rubber connector between the Y and the PLASTIC intercooler pipe, both of which are prone to splitting/breaking and leaking boost - the Latter "EFINI" version is all Aluminum has a larger ID for better flow and uses a flanged & Bolted conection an easy Bolt in Upgrade
>>And what the AST is used for and WHY does or need to be removed? All inquiries welcome.....Nap 2002.<<
The AST (Air Seperation Tank) serves the simple function of removing potentially harmful Air Bubbles from the coolant (hence it name) the problem is that the OEM unit is a two piece plastic casting that is prone to splitting along the seam causing almost instant loss of all coolant it is a good idea to replace the OEM unit with an aftermarket Aluminum or SS unit. There is some debate as to wether or not it is needed at all , however in my opinion MAZDA would not have spent the $$ to design it into the system if it wasn't needed.
The "Y" pipe ia a Y shaped pipe that collects the intake air from the two turbos and feeds into the intecooler. the early version had a rubber connector between the Y and the PLASTIC intercooler pipe, both of which are prone to splitting/breaking and leaking boost - the Latter "EFINI" version is all Aluminum has a larger ID for better flow and uses a flanged & Bolted conection an easy Bolt in Upgrade
>>And what the AST is used for and WHY does or need to be removed? All inquiries welcome.....Nap 2002.<<
The AST (Air Seperation Tank) serves the simple function of removing potentially harmful Air Bubbles from the coolant (hence it name) the problem is that the OEM unit is a two piece plastic casting that is prone to splitting along the seam causing almost instant loss of all coolant it is a good idea to replace the OEM unit with an aftermarket Aluminum or SS unit. There is some debate as to wether or not it is needed at all , however in my opinion MAZDA would not have spent the $$ to design it into the system if it wasn't needed.
Last edited by maxpesce; 01-04-02 at 12:30 PM.
#4
Here's a recycled pic from an earlier post that shows the y-pipe in the upper right, along with the rubber coupler that splits. (Ignore the "this and this" arrows.)
13-240D = Y-pipe
13-247 = rubber coupler
13-240D = Y-pipe
13-247 = rubber coupler
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