It is getting hot

Tech tips and how to's

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Pierre
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It is getting hot

Post by Pierre » Sun Jun 23, 2019 7:18 am

Hello everyone,

I am new to this community and just recently got a 1968 Datsun 2000, which I am very exited about.
The body has been redone and it run's great.
I noticed while driving (top down) that it gets pretty hot inside, I guess the engine and transmission being so close that this is normal ! (is it?)
But I also noticed that there is a lot of heat coming from underneath where the exhaust pipe runs (driver side).
Do you guys think I should insulate part of the exhaust pipe which runs directly under the driver?

thx for your help and advise !

Pierre
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david premo
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Re: It is getting hot

Post by david premo » Sun Jun 23, 2019 9:42 am

The muffler in the X member is the problem. On your car it should have been installed behind the X member.

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notoptoy
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Re: It is getting hot

Post by notoptoy » Sun Jun 23, 2019 10:03 am

Where are you located? Based on the topside pic, somewhere in Europe. The car looks well sorted underneath. Which rear shock absorbers are those?
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theunz
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Year: High Windshield-68-70

Re: It is getting hot

Post by theunz » Sun Jun 23, 2019 10:49 am

Indeed a very clean chassis. Some insulating material above the muffler might help if there is enough room. You could also put something like dynomat under the carpet. On the latter models like yours they did, as David Premo mentioned move the muffler behind the X member for just that reason. Looking forward to more pictures and info on your car.
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Pierre
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Re: It is getting hot

Post by Pierre » Mon Jun 24, 2019 2:08 am

Thx for the answers and all the advises.

I am located in Luxembourg (Europe). and the shock absorbers are gas absorbers but I do not know the brand.
I dont know if I can move the muffler that easy I guess if I do so I have to change the rest of the exhaust pipe as well.
I think I gonna try to insulate the muffler this should not be to hard.
I also thought on lay a dynamat under the carpet but the problem is the are already anti vibration mat glued to the body and they tend to "melt" with the heat so I have to control the heat under the frame...
I will try to dis this week and gonna keep you guy informed what I did also post some pictures.

thx,

Pierre

david premo
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Re: It is getting hot

Post by david premo » Mon Jun 24, 2019 6:43 am

All the 311’s 68 and earlier had the muffler mounted in the X member. It was because of the problem that you described that Nissan moved the muffler just behind the X member so the heat was no longer trapped in that section of frame. I know of one car the carpet got so hot it started to smoke and melt under the back of the drivers seat.

C.Costine
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Re: It is getting hot

Post by C.Costine » Mon Jun 24, 2019 8:05 am

Pierre, my 1600 has an original muffler which incorporates a heat shield above it. The heat from the muffler has to pass through an air space with air flowing through before it gets to the shield, and then there is an additional air space with air flow between the shield and the underside of the floor. This keeps the floor from getting hot. You should have room to attach a plate to the top of your muffler. I suggest 18 gauge.
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Pierre
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Re: It is getting hot

Post by Pierre » Mon Jun 24, 2019 11:35 am

C.Costine wrote:
Mon Jun 24, 2019 8:05 am
Pierre, my 1600 has an original muffler which incorporates a heat shield above it. The heat from the muffler has to pass through an air space with air flowing through before it gets to the shield, and then there is an additional air space with air flow between the shield and the underside of the floor. This keeps the floor from getting hot. You should have room to attach a plate to the top of your muffler. I suggest 18 gauge.
That's exactly what I wanted to do . How and where do you attach the plate? Do you have some pictures ?
thx for the details!!!
Pierre

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notoptoy
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Re: It is getting hot

Post by notoptoy » Mon Jun 24, 2019 11:49 am

Not great pictures, but attached see a comparison of JT68's SS Muffler, next to the factory 1600 muffler. Look closely and you can see the thin shield attached at the seams of the muffler. In the second photo, comparing the pipe diameters, you can clearly see a portion of the shield just beside and below my thumb as welded into place. JT's is gorgeous, but does not have the heat shield, as it also mounts behind the X-Frame. The new is a two-inch SS pipe.
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Pierre
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Re: It is getting hot

Post by Pierre » Mon Jun 24, 2019 2:56 pm

I see thx for the pictures . so it is welded ok the muffler... hmmm... I thought I would put a shield between the body and the muffler and fix it on the body or the chassis but I do not know how much space there is. I was nor prepared on welding :)

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notoptoy
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Re: It is getting hot

Post by notoptoy » Mon Jun 24, 2019 3:44 pm

Pierre:
This is just the factory example, I think there are other ways to accomplish what you want to do. I just wanted you to see the original way the shielding was handled.
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spl310
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Re: It is getting hot

Post by spl310 » Mon Jun 24, 2019 3:46 pm

go to the junkyard and look at some more modern cars they typically have this sort of corogated looking aluminum heat shield that screwed riveted or some other way attached to the bottom of the car it would work fine on a roadster
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notoptoy
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Re: It is getting hot

Post by notoptoy » Mon Jun 24, 2019 4:01 pm

^good point, My '99 Explorer had the heat shields on the muffler, and they rattled like heck when the (tiny) welds broke in the first year. Ford dealer fixed it under warranty, by installing 2 giant stainless steel hose clamps around the heat shield and entire muffler! Rattle gone and 18 years later, still firmly in place with nary a spot of rust on the clamps.
I would wager this method would work well in this application.
"When all else fails, force prevails!" Ummm, we're gonna need a bigger hammer here.

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65 Impala Convertible
2017 C43 AMG

C.Costine
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Re: It is getting hot

Post by C.Costine » Mon Jun 24, 2019 6:24 pm

spl310 wrote:
Mon Jun 24, 2019 3:46 pm
go to the junkyard and look at some more modern cars they typically have this sort of corogated looking aluminum heat shield that screwed riveted or some other way attached to the bottom of the car it would work fine on a roadster

My Arctic Cat F-1100 turbo snowmobile has a bunch of aluminum heat shields under the hood. I have had to repair them because the rivets loosen easily in the aluminum. To Pierre; If I were you I would measure the space between your muffler and the floor then remove the muffler and take it to a welding and fabrication shop, and ask them to cut a piece of 18 gauge steel to go half way around the muffler, extending an inch front and back and weld it to your muffler. They will do it with a MIG welder. It should be spaced away from the muffler half of the distance that you have measured between the muffler and the floor. If you have more than an inch of space you could even have them make two. The second, being the upper, would go half as far around as the first.
located in Chester NH
1967 1600 in restoration
2013 Arctic Cat F-1100 turbo
Ford F-350 6.0
Ford 9000 puller, Ford 960 puller, Ford 901show, Ford 971 worker, Oliver 70 waiting its turn