Initially when I heard about the oil dilution in the L15B7 I told myself I wasn't going to buy the car. That is something that I was also going to ask about but in a different post. This will assist with flow of the drain and allow it to peel from the frictional surfaces. This way, you allow the additives manufactured into the oil do absorb as much carbon based elements in their surroundings. I always suggest using Synthetics that have the highest content of Detergents & Dispersants. The Synthetic will be far less likely to ACIDIFY & OXIDIZE on metal. What I am suggesting is that if you use a Synthetic Oil (in of itself) you will decrease the Carbon Footprint in the Engine as opposed to using a non-synthetic oil (which are highly Carbon based). The blow-by that does find it's way through that path is now more than just a carbon based break down, it is layered with hydrocarbon distillates which together decrease the chance of adhering to the valves. That fuel in the oil is actually "complimenting" the disformation of carbon making its way out of the combustion chamber, around through the air intake, then back through the intake manifold. However, keep in mind what many compain about: Oil Dilution.
Over time it will build and build and "cake" on (sort of speak). Mind you, that without a port injection setup spraying over the valves, eventually they will get covering in carbon based particulates. This has really come into place about 4years ago (after the manufacturing) and the focus has been on the PCV systems. More modern manufacturing has taken precautions and improved the secondary effects of "blow-by" in direct injection platforms (especially turbo charged engines). If it had (2) Set of injectors, then it would be a Multi-Port. There is only (1) Set of injectors - thus, DI platform. So the question is, does the L15B7 1.5T in the newer civics actually have that second set of injectors in the ports or is what I read false? I've been unable to confirm it. I'm probably still going to get an oil catch can because it just feels better to know I'm keeping that gunk out, but I still would like to confirm whether or not thats true about the set of secondary injectors. I also read in one place that the reason it's not a huge deal on these motors is because there's actually 2 injectors per cylinder, one that injects directly and a secondary injector in the port where it normally would be. I've read that in the newer Honda gdi's this isn't as much as a problem. It's pretty easy to understand why port injection keeps the valves clean by spraying gas on their backsides and how injecting directly into the cylinder means they don't get the same cleaning. One of the things I stumbled across was about direct injection in general and has to do with carbon buildup on the valves.
L15b7 flutter valve driver#
I bought a 2018 civic si as a daily driver and have been doing a fair bit of research into the L15B7 motor. I have a LOT to learn so I'm sorry if this is a dumb or previously answered question. 003 between the wristpin and pin bore.Īccord 1.5T / Civic 1.5T / Civic Si / CR-V 1.I'm fairly new to the car scene and have a quick question about direct injection engines. Depending on the application clearances typically range from. The pin bore is precision honed to attain an exact pin clearance. Broaches are also used to accommodate the wristpin shape under compression, as it can become somewhat oval and needs room in order to alleviate galling. This is a standard option on any piston that receives forced pin oiling.īroaches are horizontal slots in the pinbore designed to allow oil to enter between the wristpin and pinbore. This groove accumulates residual gasses from combustion which alleviates top ring flutter and premature second ring wear, improving ring seal.ĭouble Pin Oilers (opposed to single pin oilers), in conjunction with our annular reservoir, can add twice the amount of oil from the cylinder wall to the wristpin bore. V-shaped groove machined in the 2nd ring land that adds to the volume between the top and second ring. These grooves also protect the top ring by disrupting detonation waves. Having the correect cam and barrel on a part promotes the following:ĪNTI DETONATION GROOVES (CONTACT REDUCTION GROOVES)Īlso know as contact reduction grooves, which limit the piston/cylinder contact during high temperature and high RPM. Depending on the forging and application, different cam and barrel profiles are utilized for maximum performance. These shapes have been found to seal up cylinders and reduce harmonics in the bore better than ever before. Extensive research and development has been done to find the optimum skirt shape for each piston. The Cam is the shape around the skirt of the piston and the barrel is the shape from under the oil ring to the bottom of the skirt. Pistons come with wrist pins, pin fitted, and locks.
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