Which is radiator outlet?
Thread Starter
Advanced
Joined: Jun 2016
Posts: 67
Likes: 7
From: Newcastle Upon Tyne
Also I am sure I read somewhere that on the LS1 the heads get the cool water first. So I am a bit confused.
Safety Car
Joined: Jun 2017
Posts: 4,786
Likes: 425
From: North Georgia, USA
On the LS1, the thermostat is in the return hose to the water pump. The working part of the thermostat is in the bypass return passage into the pump and senses engine temperature there. When it opens, it allows cool water from the radiator into the water pump inlet (suction side).
Thread Starter
Advanced
Joined: Jun 2016
Posts: 67
Likes: 7
From: Newcastle Upon Tyne
On the LS1, the thermostat is in the return hose to the water pump. The working part of the thermostat is in the bypass return passage into the pump and senses engine temperature there. When it opens, it allows cool water from the radiator into the water pump inlet (suction side).
Thread Starter
Advanced
Joined: Jun 2016
Posts: 67
Likes: 7
From: Newcastle Upon Tyne
You see to my mind the thermostat holds water in the block until it is warm enough. Then opens and let's water OUT the block to the radiator. So with the thermostat being connected to the bottom hose that to me suggests that the bottom hose is connected to the pump outlet. Therefore the radiator inlet.
Am I completely wrong here?
Am I completely wrong here?
Safety Car
Joined: Jun 2017
Posts: 4,786
Likes: 425
From: North Georgia, USA
You see to my mind the thermostat holds water in the block until it is warm enough. Then opens and let's water OUT the block to the radiator. So with the thermostat being connected to the bottom hose that to me suggests that the bottom hose is connected to the pump outlet. Therefore the radiator inlet.
Am I completely wrong here?
Am I completely wrong here?
The Germans (VW/Audi and Mercedes Benz for sure) have had the thermostat at the water pump, in the return (lower) hose from the radiator. They place it with the operating parts (the pellet/spring) in the bypass coolant path so it gets flowing coolant from the engine while the engine is running and warming up.
I'm fairly certain The LS1 family (including the iron block truck engines, as well as the later LS2 family) uses this type of thermostat arrangement. The LSx engines also pump water into the top of the heads and draw hot water out of the lower part of the block into the bypass passages and the radiator. So everything is "backwards" on the LSx engines.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer