Question on Thermal Switches
12-07-2016, 05:17 PM
#41
Racer
Thread Starter
12-07-2016, 05:22 PM
#42
Racer
Thread Starter
Your red arrow is pointing to the transmission spark TVS switch...not the EFE...as DUB points out.
So the TVS switch hose routes to the distributor; through the TVS switch; and then onto the carb port. Engine manifold vacuum is controlling or managing distributor spark advance...kind of an interesting "vacuum" emission management technique.
The attached document shows the hose routing of a 1978 L48 to the carb port less the transmission spark TVS switch (#3). All you are doing is inserting the TVS switch into the distributor to carb port hose circuit. In my 78, I don't have the TS TVS switch so it connects directly. What you may be missing is the "F" which is a three-port check valve. The hose from the distributor routes to the front port of the check valve. From your AIM Schematic, you can see that two ports route to the TR Spark TVS switch. The back side of the check valve routes to the carb port per my schematic below.
Supposedly, you 79 gets 5 HP more from all this emission hose configuration...but, as you have learned, it gets much more freakin complicated. We should have recognized that this was a premonition of an Obama administration.
Frankly if you wanted to make your Corvette life less complicated, configure it like my 78. Get a thermostat housing with only one inlet port for a TVS switch. You're down to purple and yellow...drop the green and route the hose directly from the distributor to the lower carb port as shown in the schmatic.
Attachment 48043491
So the TVS switch hose routes to the distributor; through the TVS switch; and then onto the carb port. Engine manifold vacuum is controlling or managing distributor spark advance...kind of an interesting "vacuum" emission management technique.
The attached document shows the hose routing of a 1978 L48 to the carb port less the transmission spark TVS switch (#3). All you are doing is inserting the TVS switch into the distributor to carb port hose circuit. In my 78, I don't have the TS TVS switch so it connects directly. What you may be missing is the "F" which is a three-port check valve. The hose from the distributor routes to the front port of the check valve. From your AIM Schematic, you can see that two ports route to the TR Spark TVS switch. The back side of the check valve routes to the carb port per my schematic below.
Supposedly, you 79 gets 5 HP more from all this emission hose configuration...but, as you have learned, it gets much more freakin complicated. We should have recognized that this was a premonition of an Obama administration.
Frankly if you wanted to make your Corvette life less complicated, configure it like my 78. Get a thermostat housing with only one inlet port for a TVS switch. You're down to purple and yellow...drop the green and route the hose directly from the distributor to the lower carb port as shown in the schmatic.
Attachment 48043491
12-07-2016, 05:36 PM
#43
Race Director
If you want to by-pass the green TVS...you can simply put a pipe plug in the thermostat housing where the green one would go.
If my memory serves me correctly. I would have to see a correct hose routing for it to be for certain.
The TVS that goes to the distributor....stops the vacuum to the distributor advance until the coolant gets hot enough to open the green TVS.
Do you still want me to look for you for the green one???? I have a super rough day today from the time i got to work til I left. I feel whipped.
DUB
If my memory serves me correctly. I would have to see a correct hose routing for it to be for certain.
The TVS that goes to the distributor....stops the vacuum to the distributor advance until the coolant gets hot enough to open the green TVS.
Do you still want me to look for you for the green one???? I have a super rough day today from the time i got to work til I left. I feel whipped.
DUB
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r16678 (12-09-2016)
12-07-2016, 05:47 PM
#44
Racer
Thread Starter
If you want to by-pass the green TVS...you can simply put a pipe plug in the thermostat housing where the green one would go.
If my memory serves me correctly. I would have to see a correct hose routing for it to be for certain.
The TVS that goes to the distributor....stops the vacuum to the distributor advance until the coolant gets hot enough to open the green TVS.
Do you still want me to look for you for the green one???? I have a super rough day today from the time i got to work til I left. I feel whipped.
DUB
If my memory serves me correctly. I would have to see a correct hose routing for it to be for certain.
The TVS that goes to the distributor....stops the vacuum to the distributor advance until the coolant gets hot enough to open the green TVS.
Do you still want me to look for you for the green one???? I have a super rough day today from the time i got to work til I left. I feel whipped.
DUB
12-09-2016, 06:23 PM
#45
Race Director
The numbers I have in the GM parts manual are:
For an 1980-1981 the book showed 3031549. But I wrote this number in the book beside that number which I do when there has been a part number change. The number I wrote in is 355961
Then the book showed another number for a 1980 also which is 3043015
There was NO specific listing for a 1979 at all. On the page for a 1979...it did not even show that TVS. It did show the EGR TVS and the EFE TVS though. But the numbers listed above are for the spark control TVS.
DUB
For an 1980-1981 the book showed 3031549. But I wrote this number in the book beside that number which I do when there has been a part number change. The number I wrote in is 355961
Then the book showed another number for a 1980 also which is 3043015
There was NO specific listing for a 1979 at all. On the page for a 1979...it did not even show that TVS. It did show the EGR TVS and the EFE TVS though. But the numbers listed above are for the spark control TVS.
DUB
The following users liked this post:
r16678 (12-09-2016)
12-09-2016, 06:37 PM
#46
Racer
Thread Starter
The numbers I have in the GM parts manual are:
For an 1980-1981 the book showed 3031549. But I wrote this number in the book beside that number which I do when there has been a part number change. The number I wrote in is 355961
Then the book showed another number for a 1980 also which is 3043015
There was NO specific listing for a 1979 at all. On the page for a 1979...it did not even show that TVS. It did show the EGR TVS and the EFE TVS though. But the numbers listed above are for the spark control TVS.
DUB
For an 1980-1981 the book showed 3031549. But I wrote this number in the book beside that number which I do when there has been a part number change. The number I wrote in is 355961
Then the book showed another number for a 1980 also which is 3043015
There was NO specific listing for a 1979 at all. On the page for a 1979...it did not even show that TVS. It did show the EGR TVS and the EFE TVS though. But the numbers listed above are for the spark control TVS.
DUB