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  #1  
Old 10-15-2019, 11:32 PM
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Beach_Dude Beach_Dude is offline
327 Rambler
 
Join Date: Mar 03, 2011
Location: Newport Beach
Posts: 533
Pictures of under carriage

Putting factory exhaust manifold back on and redoing the entire exhaust system since it's rusted between here and hell.

The biggest issue I have is that I ordered a y pipe from a scrap yard, but I don't see how it fits with the hydromatic and the 360, thinking it's probably the wrong pipe.

Originally I was going to piece it all together, cut, spot weld with flanges, then bring to an exhaust shop for them to just remake it all.

Looks like I just might have it towed to an exhaust shop to have it done if I can't figure it out tomorrow.

Does anyone have any clear images of the undercarriage with a 360 and th400 for 1977, iirc the same as 1976-1979?
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1977 Jeep Cherokee Chief
360 w/ MC 4350
Modified header exhaust w/ported AIR Injection
Slightly modified suspection
Original paint, garaged/non-op for over 15 years
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  #2  
Old 10-16-2019, 07:41 PM
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babywag babywag is offline
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Location: Land of froot loops and cukcoo-nuts, CA
Posts: 9,450
http://www.ifsja.org/forums/vb/showthread.php?t=187579

He had whole exhaust system if still available probably save you time & $$.
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'88 GW (aka Babywag) and '90 GW (aka JUNKbucket) both fuel injected
1994 Caprice wagon
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  #3  
Old 10-17-2019, 12:27 PM
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Beach_Dude Beach_Dude is offline
327 Rambler
 
Join Date: Mar 03, 2011
Location: Newport Beach
Posts: 533
Just did a shotty build on the exhaust, making it work to drive to the exhaust shop. However, there's one major problem prohibiting me from getting it completed now.

THE HEAT RISER DOESN'T WORK!

I called the jeep shop I purchased it from and they're checking in on a return for the item.

Basically, the spring is loaded closed cold, heats up to where the oil from my hands on the exhaust was smoking, and I still had to take a screw driver to the heat riser to open the valve. It moves freely, not sticking from friction, but the spring is super tight.

Is there a way to install them incorrectly if it was a complete Heat riser that would cause it not to function properly?
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1977 Jeep Cherokee Chief
360 w/ MC 4350
Modified header exhaust w/ported AIR Injection
Slightly modified suspection
Original paint, garaged/non-op for over 15 years
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  #4  
Old 10-18-2019, 11:49 AM
KillyMcGee KillyMcGee is offline
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Join Date: Aug 26, 2019
Location: Arkansas
Posts: 45
Quote:
Originally Posted by Beach_Dude

THE HEAT RISER DOESN'T WORK!

?

Help someone who's not familiar with many carbed motors. Is the purpose of the heat riser to aid in getting the engine to temperature quicker?

What about the lines that go from the exhaust manifold to the intake?
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  #5  
Old 10-18-2019, 07:42 PM
Beach_Dude's Avatar
Beach_Dude Beach_Dude is offline
327 Rambler
 
Join Date: Mar 03, 2011
Location: Newport Beach
Posts: 533
The air injection tubes are to add oxygen to the exhaust, allowing a full burn of hydrocarbons and converts gasses to a full co2+h20+n2+o2 exhaust, by adding additional o2 to the mix.

Those are nessisary to pass emissions in many states.

If you're on a budget type car, disconnect it all and get the plugs from an online source.

People say it helps the engine run smoother, etc... I can't vouch for that. What I can say is that these exhaust parts aren't getting any cheaper and just nip it in the butt and get rid of them.

Gonna just make another post...
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1977 Jeep Cherokee Chief
360 w/ MC 4350
Modified header exhaust w/ported AIR Injection
Slightly modified suspection
Original paint, garaged/non-op for over 15 years

Last edited by Beach_Dude : 10-19-2019 at 12:37 AM.
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  #6  
Old 10-25-2019, 08:55 AM
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tgreese tgreese is offline
 
Join Date: May 29, 2003
Location: Medford MA USA
Posts: 11,087
Quote:
Originally Posted by KillyMcGee
Help someone who's not familiar with many carbed motors. Is the purpose of the heat riser to aid in getting the engine to temperature quicker? ...
Mmm - I'd guess it does not affect the coolant temperature much. The main reason for the valve in the pipe is to force exhaust gas through the intake manifold so it exits on the other side. This heats the intake manifold, which helps prevent fuel from condensing on the inside of the cold intake manifold runners. A warmer intake means you can use a leaner mixture during warm-up, which reduces HC emissions before the coolant comes up to temp. It also improves cold weather drivability, providing better startup-and-go capability when it's cold.
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Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
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