Wasn't that an engine built by Mercury Marine?Seems like this does not have balance shafts or VVT? Odd. I'll bet it fills an engine bay, DOHC V-engines are massive compare to rods.
Also, 'vette had a DOHC V8 option in the early 90's.
Wasn't that an engine built by Mercury Marine?
I almost tagged you. What year was your experiment dual plenum intake engine being tested?And designed by Lotus.
There was a dude on the old board who was rebuilding one, looked pretty cool.
I almost tagged you. What year was your experiment dual plenum intake engine being tested?
First thing I noticed, that MF is gonna breatheThe intakes have a straight shot at the intake valves
Lexus V8's are the same.Oh, and the starter is in the valley! LOL.
Northstar too.Lexus V8's are the same.
How many of those 25 YO eurotrash V8 4cam vvt, plastic intake manifold, plastic evap and vacuum hosed POS' are on the road now without a CEL, oil leaks, or shittastic electrical issues?If you're gonna fix it, fix it.
GM has finally caught up to the euro v8's of 25 years ago that all had 4 cams and variable valve timing and variable length intake runners.
next thing you know they'll figure out turbochargers like everyone else.
There's a reason the Europeans downsize it and boost em. Shake more than a hitachi wand.
IIRC they started using the flat plane in the C8R pretty early, now it's finally trickling down into production models. Sounds mean (this is the race version of course)
and how are electrical and evap problems related to engine design and durability?How many of those 25 YO eurotrash V8 4cam vvt, plastic intake manifold, plastic evap and vacuum hosed POS' are on the road now without a CEL, oil leaks, or shittastic electrical issues?
direct injection. Think of it more like a diesel. You're putting the fuel in the cylinder exactly when you want it to go boomAny idea why the injectors spray in from the exhaust side? Seems like a good way to detonate off a hot exhaust valve.....
Nailhead has an atrocious exhaust port....The intakes have a straight shot at the intake valves, just like a 1953 Buick Nailhead! :)
Not at all. Injection occurs much earlier so the fuel/air mixture has time to homogenize. Typically during the intake stroke. As far as placement in this engine IDK, but it could be to get better mixing because its counter to the airflow. Could also just be for packaging.direct injection. Think of it more like a diesel. You're putting the fuel in the cylinder exactly when you want it to go boom
It’s ok. Plenty of people that don’t mind waiting in the 6+ month waiting list. Power sells. Just like the 392 Rubicon. Ordering was placed on hold until 2022.It's a different beast from past GM designs, it will be interesting to see if they hold up. 8500 RPM redline
At 90k for base model, it's not going to be cheap. Wasn't the c8 base price supposed to be 60k
but still after that exhaust valve is closed right?Not at all. Injection occurs much earlier so the fuel/air mixture has time to homogenize. Typically during the intake stroke. As far as placement in this engine IDK, but it could be to get better mixing because its counter to the airflow. Could also just be for packaging.
The big advantage of GDI over PFI is the charge cooling effect of the fuel vaporizing as it mixes with hot residual gasses, drawing more mass of air into the combustion chamber and slightly helping knock limits. In normal part load operation a GDI engine will start injecting in the early portion of the intake stroke so in general the exhaust valve should be fully closed before raw fuel has a chance to reach it (not the case during catalyst light off though!). The vaporizing fuel cools off the residual gasses in the cylinder to suck in more air before the intake valve closes. With a PFI engine, the fuel is sprayed onto the closed intake valve so it's more likely to only mix with the fresh air which is already cool rather than hitting the hot trapped residuals so the cooling effect while the intake valve is still open isn't nearly as effective. The amount of air/fuel that can short circuit out the exhaust port is very small for a half way modern EPA compliant camshaft during normal part load operation, regardless of injection strategy.but still after that exhaust valve is closed right?
you know a whole lot more than most.
schools us.
I was under the impression that it was still later than any kind of port injection where you may have fuel entering with valve overlap and a partially open exhaust port.
all very interesting.The big advantage of GDI over PFI is the charge cooling effect of the fuel vaporizing as it mixes with hot residual gasses, drawing more mass of air into the combustion chamber and slightly helping knock limits. In normal part load operation a GDI engine will start injecting in the early portion of the intake stroke so in general the exhaust valve should be fully closed before raw fuel has a chance to reach it (not the case during catalyst light off though!). The vaporizing fuel cools off the residual gasses in the cylinder to suck in more air before the intake valve closes. With a PFI engine, the fuel is sprayed onto the closed intake valve so it's more likely to only mix with the fresh air which is already cool rather than hitting the hot trapped residuals so the cooling effect while the intake valve is still open isn't nearly as effective. The amount of air/fuel that can short circuit out the exhaust port is very small for a half way modern EPA compliant camshaft during normal part load operation, regardless of injection strategy.
A big drawback of GDI is the reduced time for all the fuel to completely vaporize before ignition and less time for the fuel/air/residuals to mix before ignition so you get little pockets of overly rich fuel burning slowly. Doesn't hurt torque performance, but results in smoke especially at high loads. I'll see if I can find a public image to share, but if you look at GDI style combustion with a high speed camera in cylinder or a combustion vessel, you'll see little specs of yellow which when slowed down look just like a tiny version of setting raw gas on fire in your driveway. Smokey, yellow, cold flame.
Any idea why the injectors spray in from the exhaust side? Seems like a good way to detonate off a hot exhaust valve.....
Nothing partial about it. Choo choo!all very interesting.
Is this partially why I see ecoboost f150s smoking like trains at WOT?
First I saw it I thought the truck was broken. I was like *no way that passed emissions", but every one smokes when you get it.Nothing partial about it. Choo choo!
I think the general consensus is that GPF's are the future, or go back to PFI once regulations catch up. Doesn't seem like it can be reduced enough in cylinder.
Thats been a thing on anything with a cat or close turbo for a long time. Epa and carb will be making that a nono fairly soon. Power enrichment has already be regulated out AFAIK.newer trucks will also go rich when the engine is pulling hard like a load up a grade.. This protects the convertors..