Timing Chain Trencher idea to prevent rattle and failure by crowd sourceing a circuit

[mxl4729]

I have changed my timing chain trenchers to prevent failure but I only start my truck ever few days and still rattles after sitting.

when i start the truck every day i do not get any rattle on start.

i find that if the truck has been sitting for 24hours or more cranking the engine for about a second (not enough to start the engine) and turning off the key then starting seems to eliminate the rattle.

I wold like to build a circuit to do this automatically. i would like to do this in a open source way so that anyone could build them as well and befit for the collective ideas of the group. I will do the work of building and or coding or what ever need to get done as i was going to do it anyway.

my idea that i am looking for input on or looking for better ideas is as follows


cut the wire that feeds power into the coil pack.

use an amtel chip with the input being the power to the coil pack and the output to power the coil pack. the amtel chip would be power at all times by the battery and has very low stand by current.

the chip would have 4 states.
1) NO power to the coil pack = NO output to the coil pack.
2) Power is applied to the coil pack and power has been applied in the last 24 hours = power is passed to the coil pack
3) Power is applied to the coil pack and power has NOT been applied in the last 24 hours = power is passed to the coil pack after a 1 second delay.
4) Power is applied to the coil pack and power has NOT been applied in the last 80 hours = power is passed to the coil pack after a 2 second delay.

this delay lets oil pressure build when the engine is cranking before the engine starts.

the above would only cost a few bucks to build and i think would increase the life of the engine timing trenchers plastic guides

I can program this up no problem but am looking to see if other thing it will work and or have any better ideas. also what wires to cut to install this.

 

[2000StreetRod]

building oil pressure

The reason the chains don't rattle when restarted within 24 hours (in your case) is because there is still oil on the timing chains and guides. However, there is no oil pressure on the hydraulic tensioners - just spring pressure. The best method to increase timing chain longevity (and all bearing surfaces) is to pressurize the oil system prior to cranking the starter. In my opinion that is best accomplished with an electric oil pump. Unfortunately, an appropriate one is fairly expensive and somewhat difficult to install. The next best solution is an oil accumulator (i.e. Accusump) but it is also fairly expensive and somewhat difficult to install.

I suspect it may take several seconds of cranking the starter before the oil pressure builds up enough to activate the oil pressure gauge (5 psi). I could determine just how long using my remote crank capability.

 

[mxl4729]

i agree that an accusump or electric oil pump would be best but they cost to much and i would be afraid of failure or other issues they might introduce. external lines oil filter adapters are just more parts to cause issues.

would like to keep is as simple as possible. the quick crank and turn off right before it starts then starting it works. i do it every week. turn the key to crank (can't me more then 1 to 2 sec) then quickly turn it off right before it starts. then start it like normal no rattle after sitting for week or more.

I have no way to check but i would say that 1 second of cranking could build a decent amount of oil pressure but i have no way to check it.

 

[colintrax]

You're not doing yourself any favors cranking the truck like that. Invest in an electric pump or deal with the rattle, it's just part of hydraulic tensioners. Maybe see if there's a mechanical tensioner available. My friend bought one for his KTM bike, because the rattle drove him crazy. To each his own I guess