2010 sr5 engine sound
- Thread starter love_4runner
- Start date
eace:
Koz
New member
dekeman
New member
Harper, you have your headers installed yet? We all want to hear what that sounds like.
Fuzzylogic
New member
At the top of the valve, you can see the roller rocker. On the other end of the roller rocker is a hydraulic lash adjuster (small cylinder/bullet shaped guy). Basically, as your valvetrain components wear, the hydraulic lash adjuster uses hydraulic pressure to push the plunger upward to ensure that there is no lash between the camshaft, roller rocker, and top of the valve.
Basically, this means no valve jobs required down the road to maintain performance and prevent that terrible valve chatter noise that older engines get.
I personally think that modern injectors make the ticking noise. Those high pressure injectors are a noisy lot, particularly in DI vehicles.
Got it! Thanks! That's not how I envisioned it. I pictured the cam lobe directly actuating the valve in my mind.
It's been many years since I last tore down a motor. And I've never gotten into an ohc.
harper7
Senior Member
One problem to the injectors making the noise theory Quentin...... Pretty sure they are using the same injectors as the older 1GR-FE engine version. I had the previous version of the 1GR-FE in my 06 Runner and it was much ,much quieter. Here is the link to the engine changes made and they don't mention new injectors. Just follow the pdf link from 1000MPH http://www.toyota-4runner.org/5th-gen-t4rs/70561-2010-sr5-engine-sound.html#post604923
At the top of the valve, you can see the roller rocker. On the other end of the roller rocker is a hydraulic lash adjuster (small cylinder/bullet shaped guy). Basically, as your valvetrain components wear, the hydraulic lash adjuster uses hydraulic pressure to push the plunger upward to ensure that there is no lash between the camshaft, roller rocker, and top of the valve.
Basically, this means no valve jobs required down the road to maintain performance and prevent that terrible valve chatter noise that older engines get.
I personally think that modern injectors make the ticking noise. Those high pressure injectors are a noisy lot, particularly in DI vehicles.
Last edited:
Are they the same part number? I'm very familiar with the 2GR-FE (messed with them on engine dynometers) and the injectors on them were quite "ticky". Do you mean quieter in the cabin or with the hood open? Is the surge tank design significantly different between the old and new 1GR? Intake manifolds change? I don't have anything to reference w/ the 4th gen, but in general, as fuel pressure goes up, injector noise goes up too. I'd find it hard to believe that fuel pressure didn't go up w/ the new 1GR. That is pretty much the best way to get more power without increasing displacement or supercharging.
Koz
New member
Some interesting info; there seems to be big problems with carbon build-up in MANY (including Lexus) direct injection engines. To keep the carbon from building up on the back of the valves, fuel needs to pass across the back of the valve to coat it with the additives in the fuel. The 2GR-FSE is one of few (if any) direct injected engines not experiencing carbon build-up. The addition of the port injector sprays fuel right on the valves and keeps them clean. I would not buy a direct injection engine unless it is proven to stay clean. There is only a temporary fix for this carbon problem, a very involved cleaning.
Koz
