1980 Corona

[oldcarnut]

Hi can anyone tell me what the tube going into the catalytic converter on my 1980 corona is for and can i bypass it

[Stefman454]

that will be the catalytic converter supply pipe, coming from the air pump which is all part of the environmental control system and prevents backfiring


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[79Corona]

Mine was totally rusted out as was the catalyic converter. I replaced the converter with a new one, and gutted the airpump system. I gutted the air pump and it remained only as an idler pulley for my A/C compressor.

[Stefman454]

Did you have any complications with removing that system?


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[79Corona]

No, none that I ever noticed. I put a Weber carb on it too.

[Stefman454]

Is yours a 4M? If so, which carb did you use? I'm thinking of changing mine too

[79Corona]

No, Coronas didn't come with a 6 cyl, mine has a 20R with a Weber carb I installed.

[bwjunkie]

re: 20r '80 corona dlx.
When I installed a Weber carb I left the air pump hose hanging, later the air pump bearings went bad, so I just took the belt off, since I have no A/C.
I still haven't handled the upper loose hose. I want to completely remove the pump, but I don't know how to handle the lower hose, maybe just plug it?

-josh

[phillipsjo]

I have a 4 door Corona 1977 with 20R engine that is in need of a tri-y header. What would fit as some are saying that 20R Corona will not work with a Thorley header for Toyota pick up.
Thank you

[79Corona]

I'm not familiar with headers for the 20R engine. What do you mean by a tri-Y header?

[79Corona]

Originally Posted by bwjunkie

re: 20r '80 corona dlx.
When I installed a Weber carb I left the air pump hose hanging, later the air pump bearings went bad, so I just took the belt off, since I have no A/C.
I still haven't handled the upper loose hose. I want to completely remove the pump, but I don't know how to handle the lower hose, maybe just plug it?

-josh

I had A/C, so I gutted the air pump (vanes already broken) and made it the idler pulley for the A/C belt. I would cap off any leftover end that will affect the engine.

[fourwd1]

Originally Posted by 79Corona

I'm not familiar with headers for the 20R engine. What do you mean by a tri-Y header?

A tri-Y header design has tubes from cyl 1 and cyl 2 connecting together creating one Y. Output of cyl 3 and cyl 4 creates a second Y. Those 2 outputs run together to create a single output, the third Y.

Y Y
.Y
..\

Another header design would be the 4-into-one.

One is better at lower rpms, the other produces more power at higher rpms.