how hot does your exhaust manifolds get on a 440

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ukester
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how hot does your exhaust manifolds get on a 440

Post by ukester »

how hot does your exhaust manifolds get on a 440 ?
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martindesign
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Re: how hot does your exhaust manifolds get on a 440

Post by martindesign »

Hot! I know ur supposed to be able to touch them. My engines have plenty of water flow and I'm sure these old manifolds are in the best shape and water may not be disbursed as evenly as it should be. With that said many people say replace them every ten years. I've run the shit out of these and its nit hurt anything. Hoses don't over heat, mufflers are good. I wouldnt worry about it unless they are smiling the paint off.
Machanic, fabricator, carpenter, plumber, electrician, designer, hotrod builder and glutton for punishment. :ugeek: current boat; 1969 Marinette 32 express bridge 440's
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Maestro
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Re: how hot does your exhaust manifolds get on a 440

Post by Maestro »

Ironically, I was planning on bringing a laser temp gun on the boat this weekend to check a few things. I will report back my findings.

Whether going fast or slow I can always hold my hand on the manifolds for 2 seconds or so. The elbows and hoses are quite noticeably hotter which I may need to look into.
Maestro
1986 32' Sedan
Chrysler 360s
1.5:1 Gears, 16x16 props

1970 28' Express
Single Chrysler 440
1:1 Gear, 14x12 prop

Green Bay, WI
spdracer
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Re: how hot does your exhaust manifolds get on a 440

Post by spdracer »

Raw or fresh water cooled? Fresh water are much hotter for sure.
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Re: how hot does your exhaust manifolds get on a 440

Post by jralbert »

"...Fresh water are much hotter for sure..."

about 20 degrees
-joel-
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Fastjeff
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Re: how hot does your exhaust manifolds get on a 440

Post by Fastjeff »

On my old boat (RWC 360s) they ran about 140 degrees at idle. The temperature alarms were around 200 ' F and never went off.

Hope that helps.

Jeff
"We live at the bottom of an ocean of air, not at the top." General Marvage Slatington
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tundrarules
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Re: how hot does your exhaust manifolds get on a 440

Post by tundrarules »

"Temp alarms".... How fancy! :mrgreen: Nice add on! You will have guys on here looking for their alarms :mrgreen:

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bill
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Re: how hot does your exhaust manifolds get on a 440

Post by bill »

BigM
They were on my 1974 32' with 318's and my present 1975 37' with 360's :) came from Marinette with them. I believe :!:
Probably came from Chryler Marine as standard equipment. :roll:
bill
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Located on LakeErie
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Fastjeff
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Re: how hot does your exhaust manifolds get on a 440

Post by Fastjeff »

Hey, they came with 'em! Temp switches (not sensors to run a gage) are located in the riser and intake manifold of most Ms I've seen (and all Chrysler powered ones). The stock unit's trip point is around 180 ' F. These are $$$ so (being a cheapskate) I use stock GM units that trip at 200 something. I added a third temp switch in the other riser, just to be sure.

Cool Jeffie
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Tuggle
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Re: how hot does your exhaust manifolds get on a 440

Post by Tuggle »

Can't tell you about 440's but with old 318's with NEW exhaust manifolds they're running in the mid 130's. That's at 2400-2500 rpm's with no thermostat's, in the next couple weeks I'll install 140's, don't expect that will change much though.
"Deplorable", 1975 32' Express, Twin 318's, Raw Water Cooled, Lake Lanier, Ga.
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