dual exhaust

wolfman98 · October 26th, 2009, 08:09 AM

I am going to change my Olds over to dual exhaust and was hoping for a little advice. I am getting the correct "S" driver's side manifold Thornton reproductions and am debating if I should also change the passenger side manifold as well. I could just go with a block off plate to save some money but wonder if it would work better with a new dual exhaust manifold. I did have the manifolds planed when I had them off over the winter so that is not an issue. If I do put on new manifolds then I am taking to a shop about 5 miles from here to have the exhaust installed. should I have the car towed or trailered there? Other than being really loud will running it from here to there hurt anything?

Oldsmaniac · October 26th, 2009, 08:46 AM

The block off plate is what the factory did and it is fine. The only manifolds without the block off would be a 442 manifold or Toronado rt side manifold. It would be your choice as what to use. As for driving with just the manifolds on I am not sure its a good idea (reasoning am not sure of) and surely you would have to make certain that the hot exhaust does not damage anything underhood.

66ninetyeightls · October 26th, 2009, 10:45 AM

If you are going to drive it to the location you need to at least install a temporary pipe that directs the exhaust flow under the car. I have seen many underhood componants melted by people letting the exhaust exit under the hood. Not to mention the amount of fumes you would be getting inside the car.

Olds64 · October 26th, 2009, 11:07 AM

I had dual exhaust installed on my 71 98 after I installed the engine with new W and Z manifolds. I put some pipe and muffler clamps on as a temporary fix when I started the engine the first time. I ended up having it towed 5 miles to the local exhaust shop becuase my insurance has free towing. I didn't know about melting under hood components. I'm glad I didn't risk it. It was only started without exhaust to move the car from the parking lot into the exhaust shop.

FWIW, I suggest having your passenger's side manifold welded closed. This will look better than a block off plate IMHO and it won't leak when the gasket gets old.

svnt442 · October 26th, 2009, 12:45 PM

There are no gaskets on that surface.

Aron Nance · October 26th, 2009, 03:17 PM

It seems that I remember (from way back) that if you ran w/the exhaust exiting quickly, as you are considering, there was a danger of burnt exhaust valves.

Think I would tow/put her on a trailer.

wolfman98 · October 26th, 2009, 03:49 PM

I'll have it towed. The car has single exhaust now and a crossover pipe to the other exhaust manifold. That is where I was wondering about welding on a Block off plate or Hunk of metal to cover the hole! Or would you think that getting both the W & Z manifolds for duel exhaust is better for some reason. svnt442 what gaskets are you talking about? I did not mention gaskets.

svnt442 · October 26th, 2009, 04:33 PM

Quote:

Originally Posted by wolfman98

svnt442 what gaskets are you talking about? I did not mention gaskets.

You didn't, but Olds64 did.

With a big block the W/Z manifolds would be the way to go if you have the cash. But it would depend on your budget and what you want to do with the car.

rocketraider · October 26th, 2009, 08:26 PM

Reminder- W & Z do not work on 65-70 B/C car. You need S & T manifolds.

W & Z will work fine on a 71-76 though!

Olds64 · October 27th, 2009, 06:39 AM

If you take the passenger's side manifold to a good welding shop they should be able to weld a plug into the crossover flange.

Oldsguy and I had some welding done on the exhaust manfiolds of his 1969 Olds Delta 88. It cost about $100 to have his passenger's side manifold crossover welded closed, and to have the exit flange on his driver's side manifold welded back on. We cut the back of a driver's side Toronado manifold off and had it welded on 180* rotated so it would clear the steering on his 1969 Delta 88. It was alot of work, but at the time we didn't know about the S & T manifolds. Plus, it ended up being cheaper. $100 for labor, an hour with a hacksaw in the garage, and about $20 for the Toronado manifold.

wolfman98 · October 27th, 2009, 08:22 AM

Quote:

Originally Posted by rocketraider

Reminder- W & Z do not work on 65-70 B/C car. You need S & T manifolds.

W & Z will work fine on a 71-76 though!

Right they were advertising the "S" type for the driver's side , so the other is a "T" type?

Oldsmaniac · October 27th, 2009, 08:37 AM

The S manifold is the only one that will work on the left side. For the right hand side you have options although a muffler shop will need to make the correct bends for the pipe depending on what manifold you choose.

October 26th, 2009, 08:09 AM	#1 (permalink)
wolfman98 Captain of my ship Join Date: Jan 2009 Location: Wilmot , Nova Scotia , Canada Posts: 1,290	dual exhaust I am going to change my Olds over to dual exhaust and was hoping for a little advice. I am getting the correct "S" driver's side manifold Thornton reproductions and am debating if I should also change the passenger side manifold as well. I could just go with a block off plate to save some money but wonder if it would work better with a new dual exhaust manifold. I did have the manifolds planed when I had them off over the winter so that is not an issue. If I do put on new manifolds then I am taking to a shop about 5 miles from here to have the exhaust installed. should I have the car towed or trailered there? Other than being really loud will running it from here to there hurt anything? __________________ Now to keep her clean!! 52 Chev Styleline Deluxe (sold Nov.9th) 69 nighty-eight convertible 90 astro all wheel LT 01 TL80 New Holland 07 Colorado LT

October 26th, 2009, 08:46 AM	#2 (permalink)
Oldsmaniac Registered User Join Date: Oct 2005 Location: NJ Posts: 702	The block off plate is what the factory did and it is fine. The only manifolds without the block off would be a 442 manifold or Toronado rt side manifold. It would be your choice as what to use. As for driving with just the manifolds on I am not sure its a good idea (reasoning am not sure of) and surely you would have to make certain that the hot exhaust does not damage anything underhood. __________________ OCA Member 2587 '59 98 conv. '66 Delta Fact.4spd '66 Delta conv. '67 442 post trac pac '67 442 conv. '68 Cutlass conv. '70 Rallye 350 '92 Custom Cruiser

October 26th, 2009, 10:45 AM	#3 (permalink)
66ninetyeightls Registered User Join Date: Aug 2009 Location: Burlington, Ontario Posts: 166	If you are going to drive it to the location you need to at least install a temporary pipe that directs the exhaust flow under the car. I have seen many underhood componants melted by people letting the exhaust exit under the hood. Not to mention the amount of fumes you would be getting inside the car. __________________ _____________________________________________ Craig

October 26th, 2009, 11:07 AM	#4 (permalink)
Olds64 Landyacht Club President Join Date: Jul 2007 Location: Lawton, OK Posts: 4,284	I had dual exhaust installed on my 71 98 after I installed the engine with new W and Z manifolds. I put some pipe and muffler clamps on as a temporary fix when I started the engine the first time. I ended up having it towed 5 miles to the local exhaust shop becuase my insurance has free towing. I didn't know about melting under hood components. I'm glad I didn't risk it. It was only started without exhaust to move the car from the parking lot into the exhaust shop. FWIW, I suggest having your passenger's side manifold welded closed. This will look better than a block off plate IMHO and it won't leak when the gasket gets old. __________________ Ferris, my father loves this car more than life itself... Apparently, you don't understand! Ferris, he never drives it! He just rubs it with a diaper! Cameron Frye Ferris Bueller's Day Off 1986

October 26th, 2009, 12:45 PM	#5 (permalink)
svnt442 Registered User Join Date: Jun 2009 Location: San Jose, CA Posts: 453	There are no gaskets on that surface. __________________ Randy 1970 442

October 26th, 2009, 03:17 PM	#6 (permalink)
Aron Nance Registered User Join Date: Jan 2009 Location: Dallas Texas Posts: 181	It seems that I remember (from way back) that if you ran w/the exhaust exiting quickly, as you are considering, there was a danger of burnt exhaust valves. Think I would tow/put her on a trailer.

October 26th, 2009, 03:49 PM	#7 (permalink)
wolfman98 Captain of my ship Join Date: Jan 2009 Location: Wilmot , Nova Scotia , Canada Posts: 1,290	I'll have it towed. The car has single exhaust now and a crossover pipe to the other exhaust manifold. That is where I was wondering about welding on a Block off plate or Hunk of metal to cover the hole! Or would you think that getting both the W & Z manifolds for duel exhaust is better for some reason. svnt442 what gaskets are you talking about? I did not mention gaskets. __________________ Now to keep her clean!! 52 Chev Styleline Deluxe (sold Nov.9th) 69 nighty-eight convertible 90 astro all wheel LT 01 TL80 New Holland 07 Colorado LT

October 26th, 2009, 08:26 PM	#9 (permalink)
rocketraider Oldsdruid Join Date: Dec 2007 Location: Danville Vajenya, the Last Capital of Dixie Posts: 1,214	Reminder- W & Z do not work on 65-70 B/C car. You need S & T manifolds. W & Z will work fine on a 71-76 though! __________________ I know absolutely nothing about Oldsmobiles. Just ask the owner of Oldspower.com

October 27th, 2009, 06:39 AM	#10 (permalink)
Olds64 Landyacht Club President Join Date: Jul 2007 Location: Lawton, OK Posts: 4,284	If you take the passenger's side manifold to a good welding shop they should be able to weld a plug into the crossover flange. Oldsguy and I had some welding done on the exhaust manfiolds of his 1969 Olds Delta 88. It cost about $100 to have his passenger's side manifold crossover welded closed, and to have the exit flange on his driver's side manifold welded back on. We cut the back of a driver's side Toronado manifold off and had it welded on 180* rotated so it would clear the steering on his 1969 Delta 88. It was alot of work, but at the time we didn't know about the S & T manifolds. Plus, it ended up being cheaper. $100 for labor, an hour with a hacksaw in the garage, and about $20 for the Toronado manifold. __________________ Ferris, my father loves this car more than life itself... Apparently, you don't understand! Ferris, he never drives it! He just rubs it with a diaper! Cameron Frye Ferris Bueller's Day Off 1986

October 27th, 2009, 08:37 AM	#12 (permalink)
Oldsmaniac Registered User Join Date: Oct 2005 Location: NJ Posts: 702	The S manifold is the only one that will work on the left side. For the right hand side you have options although a muffler shop will need to make the correct bends for the pipe depending on what manifold you choose. __________________ OCA Member 2587 '59 98 conv. '66 Delta Fact.4spd '66 Delta conv. '67 442 post trac pac '67 442 conv. '68 Cutlass conv. '70 Rallye 350 '92 Custom Cruiser

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