The Story of the Clamp

So far i discovered 4 major weaknesses at my 2013 Hyundai Elantra.

1st. Electronic commanded throttle is vulnerable to dirt (dust + oil). When dirt gets in the bearings of the throttle it changes their behavior. Don't know if anybody every tried. The suction power of the throttle is so great it will pull your hand inside if you try to cover it with your palm while the engine is idling. There is enough force on those two little bearings to create important friction resistance in the bearings if dirt gets in there that would interfere with the usually weak step motors that drives the throttle. The step motor thus may skip steps unaccounted by the computer, or there is a feedback sensor that signals a position that can not be achieved between two steps as prescribed, or in other words, running out of predicted positions. Computer tries to correct that and cannot and that would create an oscillation of the throttle together with an oscillation of the engine that could lead to serious driveability problems at high speed. A little WD40 seemed to cure the problem, for now.
2nd. The top of the radiator with the filler neck is made of composite materials. The radiator cap is too weak and the two threading flaps bend especially if you are careless when you take it out to look at the level and coolant starts leaking. One threading flap is visible in this image appearing closest to viewer. I did not have problems since i sprang those back last summer. However at Jiffy Lube they took the cap to check the level and filled the reservoir. It smells like coolant every time i pop the hood ever since. Also people start coughing in the lot in the very second i pop the hood, but that is another problem, them working on creating false perceptions for those who listen to live streaming sound from cell phones.

3rd. The intake manifold is installed by design the other way around as in the old vehicles. That is under the engine head and in front of the engine. Condensed oil from blow by gases or simply leaking through PCV valve pools at the bottom of the intake. From there, during certain engine stages it starts trickling upwards through the runners in sudden, larger amounts than if it was like in older types, where it flows at more constant amounts contaminating the valves, valve rings and spark plugs.

4th. The intake manifold is made of composite materials instead of metal. The PVC port of the intake is 5/8 inch in diameter. There is no clamp good enough to eliminate any possible vacuum leak at that port when connecting a flexible hose.

Because of the catch can i added to avoid oil getting in the intake i could not use the original hose and spring type clamp that was too week for the hoses i bough at NAPA (fuel line and PCV type).

So far i tried different clamps. Last time i ordered an Amazon a set of 5 different diameters wire clamps (a type also have a little spring action and can adapt to shrinkage of the rubber, to a certain extent) because of price and thinking it will cover any size and surprise. However, when they got in i was surprised that between two of the sizes there is a gap where was missing the exact size i needed.

So i improvised using my experience with clamps for coolant bought at NAPA that were pinching the hose so i had to put a ring made of sheet metal between clamp and hose. But as rubber was giving in i had to tightened them at almost every longer trip (because if i didn't i would get 10% less mpg). And in the end the clamps' thread bent.

And this is where the story comes. I remember i cut the sheet metal for the ring long enough for the two ends of the ring to overlap. In fact, i was afraid that by overtightening the inner end would again pinch the hose. However, when tightening (the next day, after i slept at the hotel) it i was reaching a point of sudden resistance. Mpg was fine in my way there but i assume that after the rubber gave in, it went down. The two ends of the ring under the clamp touched and there was not enough tightening of the hose and vacuum started to leak again (air from outside getting sucked in the intake in an uncontrolled way, bypassing the  throttle). The computer using the sensors senses more oxygen and adds more fuel, beyond the trash-hold of full fuel efficiency. Capisci?
So today i just built another ring and this time i took a picture and put it here before installing to can prove (including to myself) that it overlaps.