BigBrother-84 Posted July 11, 2023 Share Posted July 11, 2023 Hi Gentlemen! I am in the process of reproducing Big Brother's Emission Control decal. Here is the original: While doing it, I am analyzing what equipment piece is remaining and which is gone. I am surprised to see that, although Big Brother's vacuum system doesn't have a lot of components missing possibilities, there is not a lot of stock that's still there... The missing parts are the 3 port PVS and its Vacuum Restrictor, plus the Solenoid Vacuum Valve and its VDV and VOTM. Question 1: Please help identify the part placed between the Distributer and the Carburetor 90° direct connection: 2-Although Big Brother's vacuum diagram doesn't show one, there is an EGR valve. Probably came with the "new" 351W swap? This one is simply disconnected. Should I block it in a different way (remove it, install a plate, etc) or leave it that way? 3-Solenoid fittings: What's the goal and what are they looking, any picts? Since the truck is running very well, I am wondering if I should install new ones... Link to comment Share on other sites More sharing options...
Gary Lewis Posted July 11, 2023 Share Posted July 11, 2023 Q1: Vacuum restrictor = VRest Q2: If the distributor is the original one, which means it was curved to work w/o an EGR valve, and if the engine is running well I'd leave well enough alone. But you could pull the EGR valve and put a block-off plate in there to ensure there isn't an exhaust leak. Q3: I don't see the stuff in your two circles save for the VRest. So I think all of that has been removed and all you have is the vacuum line from the carb, through the VRest, to the distributor. Am I missing something? I have to go now, but if you want to delve further there's a training manual here that might help: Documentation/Emissions/Understanding Emissions Controls. Link to comment Share on other sites More sharing options...
BigBrother-84 Posted July 11, 2023 Author Share Posted July 11, 2023 Q1: Vacuum restrictor = VRest Q2: If the distributor is the original one, which means it was curved to work w/o an EGR valve, and if the engine is running well I'd leave well enough alone. But you could pull the EGR valve and put a block-off plate in there to ensure there isn't an exhaust leak. Q3: I don't see the stuff in your two circles save for the VRest. So I think all of that has been removed and all you have is the vacuum line from the carb, through the VRest, to the distributor. Am I missing something? I have to go now, but if you want to delve further there's a training manual here that might help: Documentation/Emissions/Understanding Emissions Controls. Gary, don't rush... Big Brother runs this way since at least its "new" engine (2013) and possibly before that. I don't plan to modify anything, unless any added part could improve Big Brother's fuel consumption, or if any missing part has an impact on engine performance (timing or similar). Q1: Vacuum restrictor = VRest Q2: If the distributor is the original one, which means it was curved to work w/o an EGR valve, and if the engine is running well I'd leave well enough alone. But you could pull the EGR valve and put a block-off plate in there to ensure there isn't an exhaust leak. Q1-Thanks for identifying, I'll put this remaining part in green on the included diagram (see lower). Q2-Original distributor, yep. So I'll cap the EGR to be more secure. Q3: I don't see the stuff in your two circles save for the VRest. So I think all of that has been removed and all you have is the vacuum line from the carb, through the VRest, to the distributor. Am I missing something? The green parts on the diagram are the remaining ones, the red ones are missing. I included pictures to simply illustrate Big Brother's current vacuum system state, compared to its diagram. Link to comment Share on other sites More sharing options...
85lebaront2 Posted July 11, 2023 Share Posted July 11, 2023 Gary, don't rush... Big Brother runs this way since at least its "new" engine (2013) and possibly before that. I don't plan to modify anything, unless any added part could improve Big Brother's fuel consumption, or if any missing part has an impact on engine performance (timing or similar). Q1: Vacuum restrictor = VRest Q2: If the distributor is the original one, which means it was curved to work w/o an EGR valve, and if the engine is running well I'd leave well enough alone. But you could pull the EGR valve and put a block-off plate in there to ensure there isn't an exhaust leak. Q1-Thanks for identifying, I'll put this remaining part in green on the included diagram (see lower). Q2-Original distributor, yep. So I'll cap the EGR to be more secure. Q3: I don't see the stuff in your two circles save for the VRest. So I think all of that has been removed and all you have is the vacuum line from the carb, through the VRest, to the distributor. Am I missing something? The green parts on the diagram are the remaining ones, the red ones are missing. I included pictures to simply illustrate Big Brother's current vacuum system state, compared to its diagram. The only item I might want on it if it were mine, the early emission systems used a PVS that was set at 210°F so that if the engine got too hot, it would advance the timing (bottom port to ported spark on carburetor, center to distributor, top to manifold vacuum). I hay have one of those (or more) if you want to add that. Link to comment Share on other sites More sharing options...
Gary Lewis Posted July 11, 2023 Share Posted July 11, 2023 The only item I might want on it if it were mine, the early emission systems used a PVS that was set at 210°F so that if the engine got too hot, it would advance the timing (bottom port to ported spark on carburetor, center to distributor, top to manifold vacuum). I hay have one of those (or more) if you want to add that. I'm with Bill - What you have is working, but if you want to change add the PVS. Link to comment Share on other sites More sharing options...
BigBrother-84 Posted July 12, 2023 Author Share Posted July 12, 2023 The only item I might want on it if it were mine, the early emission systems used a PVS that was set at 210°F so that if the engine got too hot, it would advance the timing (bottom port to ported spark on carburetor, center to distributor, top to manifold vacuum). I hay have one of those (or more) if you want to add that. Bill, do you have a 3 port PVS? And am I ok to presume it will screw there? Link to comment Share on other sites More sharing options...
85lebaront2 Posted July 12, 2023 Share Posted July 12, 2023 Bill, do you have a 3 port PVS? And am I ok to presume it will screw there? I will need to check, it might be a couple of days before I get to go dig in the toolbox drawer. Link to comment Share on other sites More sharing options...
BigBrother-84 Posted July 12, 2023 Author Share Posted July 12, 2023 I will need to check, it might be a couple of days before I get to go dig in the toolbox drawer. Bill, as I have already said to Gary, it's anything but an emergency! 😉 Link to comment Share on other sites More sharing options...
BigBrother-84 Posted July 19, 2023 Author Share Posted July 19, 2023 Bill, as I have already said to Gary, it's anything but an emergency! 😉 Guys, went to NAPA for something else, and they had a 3 port PVS in stock... I bought it. And I'm waiting for my local print shop to print the replacement decal I reproduced: Here's Big Brother's original (was able to save it from original rad support, but cannot stick anymore to the new support): The fonts aren't exactly the same, but pretty close. Link to comment Share on other sites More sharing options...
Gary Lewis Posted July 19, 2023 Share Posted July 19, 2023 Guys, went to NAPA for something else, and they had a 3 port PVS in stock... I bought it. And I'm waiting for my local print shop to print the replacement decal I reproduced: Here's Big Brother's original (was able to save it from original rad support, but cannot stick anymore to the new support): The fonts aren't exactly the same, but pretty close. Looks great, Jeff! Link to comment Share on other sites More sharing options...
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