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Water Lines on Indy Intake |
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scramboy
AMC Nut Joined: Apr/12/2009 Location: new york Status: Offline Points: 456 |
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Posted: Nov/15/2018 at 6:16pm |
I have observed a number of racers run a water line on the Indy intake front to back on each side of the carburetor. What is the purpose of said lines and what advantage is it? Thanx, Scramboy.
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9081 |
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It allows the pressurised flow from the rear, where temps will be higher, due to being last in line. Technically it is to equalise temps, and keep heat from effecting engine performance.
For most using strip only, it is not a requirement. Endurance and driven half filled blocks will need it most. Oh, I just realised Indy not eddie, indy heads are solid, or mostly solid, so there is no flow of cooling like iron. It's a requirement so to speak to allow water to pass on to the front, as the head has no passages. Now anyone interested in reverse flow? Ooops! Scarpers off, quietly. Edited by 304-dude - Nov/15/2018 at 7:29pm |
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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scramboy
AMC Nut Joined: Apr/12/2009 Location: new york Status: Offline Points: 456 |
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So you are saying that it is more of a requirement on an Indy headed engine, there is no flow front to back like on a steel head?
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9081 |
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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scramboy
AMC Nut Joined: Apr/12/2009 Location: new york Status: Offline Points: 456 |
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Oh, I see the port size takes up the area that would occupy coolant passages. I am running Indy heads and manifold, the water temp gauge wouldn't reflect the discrepancy front to back.
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9081 |
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Correct. You may test for yourself to compare how your front to rear cooling is being done, by moving the temp sensor to the rear. If both look to be within a few degrees between each other, then your setup with rear lines are doing the job. |
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9081 |
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Ah, somewhere I had read that somebody was making comment about what can be done to aluminum heads, and indy was of the topic. Stating water passages were not an issue like iron heads. Maybe they were talking about eddies, but after reading I stumbled upon many Indy head users using the T or porting to the front with lines. So I assumed wrong that it is mandatory. Just better provisioned on their intake.
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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Red Devil
AMC Addicted Joined: Jul/10/2007 Location: Canada Status: Offline Points: 1743 |
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Indy heads are NOT solid. They have full coolant passages.
"> IIRC, the Indy intake has bosses at the rear for coolant flow balance lines both sides, so easy to add. Stock and most aftermarket intakes only have a boss on passenger's side for the line that normally goes to the heater. Without a heater, this line typically is routed directly to the water pump, but some cap it or route to the front water crossover. Aftermarket intakes can be modified to add a coolant balance line to driver's side rear water port. Some prefer to tee to passenger's side at rear rather than routing lines to the front water crossover. Not sure what testing has been done as to best arrangement? Stock works fine for stock use. Mine with AirGap modified for coolant balance line (tube) teeing to passenger's side with Indy SR heads. "> My understanding is Edelbrock was planning to put a boss for a coolant balance line on driver's side on their new EFI intake. Hope this helps, RD |
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Red Devil
AMC Addicted Joined: Jul/10/2007 Location: Canada Status: Offline Points: 1743 |
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This comment may have been relative to the extra head bolts. On stock and Edelbrock heads, you will hit the coolant passage so need to sleeve and seal it to add the extra bolts. The guys that worked with Indy to develop the AMC head got them to make the casting with solid material where the extra bolts go, so can add without hitting water. I have the extra bolts on mine (can see the bolt holes in the photo of the Indy head above ... assuming photo shows up). Hope this helps,RD |
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SC397
AMC Addicted Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5428 |
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I thought that they did it because it looks cool... |
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