When I pull the intake runners.......
08-14-2010, 12:28 PM
#1
Three Wheelin'
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When I pull the intake runners.......
....will I need to replace the gaskets?
I plan on disabling the 82 for a little while. I want to send the injectors to Witchhunter out in WA. Then I'm going to begin wrapping the entire intake downstream of the airbox with heat-reflective tape. I want to isolate the intake air from exhaust heat as much as possible. I can feel a tremendous difference in performance on cooler days versus hot days.
I enriched the mixture to try to cool down the exhaust temps, and it helped a little, but I want more isolation.
I plan on disabling the 82 for a little while. I want to send the injectors to Witchhunter out in WA. Then I'm going to begin wrapping the entire intake downstream of the airbox with heat-reflective tape. I want to isolate the intake air from exhaust heat as much as possible. I can feel a tremendous difference in performance on cooler days versus hot days.
I enriched the mixture to try to cool down the exhaust temps, and it helped a little, but I want more isolation.
08-14-2010, 12:49 PM
#4
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depending on how they look, probably yes, but I didnt the first time and didnt have any leaks. however, scot did. they are not a big deal to change, but a huge deal to do over. 
Now, wrapping the intake runners, is a COMPLETE waste of time. while you surely might feel a slight difference during the cold vs hot days on acceleration, you will NEVER feel any difference in isolating the intake. The runners are a poor radiator if you know what i mean. they are straight flow and have very little surface area to tranfer heat to the air intake, plus, eventually, even insulated, the heat transfers to the intake metal. After all they are bolted and thermally connected to the super hot heads and the entire system is sitting in the engine bay "oven".
At the races, Ill come into the pits and the intake will be cool to the touch for a few mins. this is because Im WOT for more than 50% of the time for 30 mins! But, after a few mins they become very hot to the touch and there is nothing you can do about that. the good news is, its not a performance issue you can help.
Now, wrapping the intake runners, is a COMPLETE waste of time. while you surely might feel a slight difference during the cold vs hot days on acceleration, you will NEVER feel any difference in isolating the intake. The runners are a poor radiator if you know what i mean. they are straight flow and have very little surface area to tranfer heat to the air intake, plus, eventually, even insulated, the heat transfers to the intake metal. After all they are bolted and thermally connected to the super hot heads and the entire system is sitting in the engine bay "oven".
At the races, Ill come into the pits and the intake will be cool to the touch for a few mins. this is because Im WOT for more than 50% of the time for 30 mins! But, after a few mins they become very hot to the touch and there is nothing you can do about that. the good news is, its not a performance issue you can help.
....will I need to replace the gaskets?
I plan on disabling the 82 for a little while. I want to send the injectors to Witchhunter out in WA. Then I'm going to begin wrapping the entire intake downstream of the airbox with heat-reflective tape. I want to isolate the intake air from exhaust heat as much as possible. I can feel a tremendous difference in performance on cooler days versus hot days.
I enriched the mixture to try to cool down the exhaust temps, and it helped a little, but I want more isolation.
I plan on disabling the 82 for a little while. I want to send the injectors to Witchhunter out in WA. Then I'm going to begin wrapping the entire intake downstream of the airbox with heat-reflective tape. I want to isolate the intake air from exhaust heat as much as possible. I can feel a tremendous difference in performance on cooler days versus hot days.
I enriched the mixture to try to cool down the exhaust temps, and it helped a little, but I want more isolation.
08-14-2010, 01:07 PM
#5
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depending on how they look, probably yes, but I didnt the first time and didnt have any leaks. however, scot did. they are not a big deal to change, but a huge deal to do over.
Now, wrapping the intake runners, is a COMPLETE waste of time. while you surely might feel a slight difference during the cold vs hot days on acceleration, you will NEVER feel any difference in isolating the intake. The runners are a poor radiator if you know what i mean. they are straight flow and have very little surface area to tranfer heat to the air intake, plus, eventually, even insulated, the heat transfers to the intake metal. After all they are bolted and thermally connected to the super hot heads and the entire system is sitting in the engine bay "oven".
At the races, Ill come into the pits and the intake will be cool to the touch for a few mins. this is because Im WOT for more than 50% of the time for 30 mins! But, after a few mins they become very hot to the touch and there is nothing you can do about that. the good news is, its not a performance issue you can help.
Now, wrapping the intake runners, is a COMPLETE waste of time. while you surely might feel a slight difference during the cold vs hot days on acceleration, you will NEVER feel any difference in isolating the intake. The runners are a poor radiator if you know what i mean. they are straight flow and have very little surface area to tranfer heat to the air intake, plus, eventually, even insulated, the heat transfers to the intake metal. After all they are bolted and thermally connected to the super hot heads and the entire system is sitting in the engine bay "oven".
At the races, Ill come into the pits and the intake will be cool to the touch for a few mins. this is because Im WOT for more than 50% of the time for 30 mins! But, after a few mins they become very hot to the touch and there is nothing you can do about that. the good news is, its not a performance issue you can help.
Thanx for the feedback. I wrapped my intake tubes with thick, heavy-duty Gorilla brand duct tape, and also wrapped the airbox top and bottom, and it helped reduce heat soak a good bit, which is what inspired me to consider wrapping the entire intake.
I'm thinking about designing a small belly pan for left and right sides with a louvre to act as a venturi to draw out engine bay heat.
08-14-2010, 01:12 PM
#6
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For an experiment, I wrapped my fuel rails with silicon self-vulcanizing tape. Can't say it made any difference, but I can reach in and touch the tape and it's barely warm while the rest of the engine is nearly on fire. I was amazed by this. So I wrapped my plug wires with the silicon tape, too. That stuff just rejects heat soak.
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08-14-2010, 01:20 PM
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08-14-2010, 01:24 PM
#12
I would change the gaskets, not worth not doing.
08-14-2010, 02:40 PM
#14
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just because you wrap something with some tape and its cooler to the touch, doesnt mean the inside is not hot as heck. go take a copper wire, wrap the heck out of it. and tape it to the side of the intake. drive all day like normal and then take the wire out of the wrap, it will be as hot as the engine bay.
fuel rails are also silly to wrap. what are you trying to accomplish?
the "stuff" doesnt reject heat soak, but can slow the process, but not by much.
fuel rails are also silly to wrap. what are you trying to accomplish?
the "stuff" doesnt reject heat soak, but can slow the process, but not by much.
For an experiment, I wrapped my fuel rails with silicon self-vulcanizing tape. Can't say it made any difference, but I can reach in and touch the tape and it's barely warm while the rest of the engine is nearly on fire. I was amazed by this. So I wrapped my plug wires with the silicon tape, too. That stuff just rejects heat soak.
08-14-2010, 02:44 PM
#15
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And that will do, anything???
Ever cook a cassorole in a ceramic pot, covered????? exactly!
the reason that ceramic coatings are so good, or jet hot coatings on exhuast, is that it does delay the rate of heat transfer outward, so by keeping the heat in, it alows for better flow characteristics. it doesnt work the other way with intake. the intake system will always be heat soaked and the intake air is moving so quickly, it really doesnt absorb much heat at high flow rates. cruise flow rates, it wouldnt matter anyway.
mk
Ever cook a cassorole in a ceramic pot, covered????? exactly!
the reason that ceramic coatings are so good, or jet hot coatings on exhuast, is that it does delay the rate of heat transfer outward, so by keeping the heat in, it alows for better flow characteristics. it doesnt work the other way with intake. the intake system will always be heat soaked and the intake air is moving so quickly, it really doesnt absorb much heat at high flow rates. cruise flow rates, it wouldnt matter anyway.
mk