High comp ,direct injection

[Al Smith]

I just recently heard about this but it's on a soon to be built for auto engine .
Direct fuel injection similar to a diesel and using up to 13.5 to one comp ratio on regular pump gas .I'm not certain about the maze of electronic gadgetry involved in this as I suppose at this point it's propritory .

As I understand it has something to do with the combustion chamber design and the piston .I've seen a piston
Rather odd design but I'm not certain if it's in the research stage or final design .
Just in the last ten years the design of internal combustion engines is going at about the pace of electronics and it's hard for an old plow jockey like myself to keep abreast of .Either one ,the engines or the electronics .

 

[jakethesnake]

I may be wrong but didn't yamaha use hpdi on thier outboards? High pressure direct inject is that what you're talking about? If so it worked well

 

[wildroamer]

Cadillac CTS has it, if I'm not mistaken.

 

[Mastermind]

New Vettes have it too.

 

[darkimpulse]

Direct injection has been used and available in the auto world in Europe for some time before it hit North America. The benefits are more control over your combustion cycle, ie ultra lean modes that fire the injector mid or very late compression stroke, using less fuel when cruising down the highway. I was also told by my mentor that as a result of direct injection, the vaporized fuel has a cooling effect, allowing Oem's to run a higher compression. Ie, less risk of knock.

Before I got out of the auto industry, had a chance to see some engines that had direct injection. Most have a swirl indent in the top of the piston to promote combustion, the one that always comes to mind that I have seen is the Ford eco boost engine.

 

[Al Smith]

I don't think this one has a turbo on it .However it does have that goofy piston.

 

[ABarrick]

GDI (Gasoline Direct Injection) is not new but is one of the more recent topics of conversation. Mazda has Skyactive, Hyundai GDI, Toyota D4S, etc. Gm uses it in most of the new stuff already. 3.6L v6 has been since atleast 2011. New generation 5.3 V8 is too. There have been some growing pains with it though. Intake runners are completely dry now and Valves are no longer self cleaning via fuel spraying on the back side from the injectors. Excessive carbon buildup can cause sticking and misfiring. Some mfr's have a dual injector system that uses port and direct injection systems on the same motor. Port for cleaning cycles and DI for normal driving. GM uses a cam driven high pressure pump to create the 5000+ psi for the DI system. The DI systems kinda blend common rail diesel technology with a gas motor. They do run well and make a lot of power for the engine size but the electronics to control it all are somewhat frightening to the average person. I work on cars everyday and it's till alot to take in. Every mfr does things just a little different and makes it tough to keep up. Aside from implementing Direct Injection they're playing with different combustion cycles too. Skyactive uses a Miller cycle rather than an Otto cycle and toyota does a pseudo Atkinson cycle with it's new cars...The days of the backyard mechanic are dwindling.

 

[bikemike]

Not a Ford guy but the new economy boost v sux don't suck at all lots of power and rpm to play with. They did good finally. It's amazing to se how hard the f150 can pull with the power plant

 

[Locust Cutter]

Subbed...

 

[ABarrick]

Not a Ford guy but the new economy boost v sux don't suck at all lots of power and rpm to play with. They did good finally. It's amazing to se how hard the f150 can pull with the power plant

At less than v8 mpg they should pull like a freight train...I have quite a few customers who bought them and then sold them shortly thereafter to go back to v8 trucks. Guys who don't tow much or ever like them as unloaded they get good mileage but as soon as you hitch up to anything with some weight, they're working too hard and get poor fuel economy. One customer in particular was reporting sub 10mpg with a 16' box trailer, 7,000lb gvwr.

Regardless of how much fuel they use or don't use, they are one overly complicated piece of equipment. It's all cool when it's under warranty but when it has over 100k on the clock and repairs are on you're dime, it no longer seems cool when you're spending half what the truck is worth to fix it.

 

[DELETED (Struggle)]

Not a Ford guy but the new economy boost v sux don't suck at all lots of power and rpm to play with. They did good finally. It's amazing to se how hard the f150 can pull with the power plant

I'll take my 6.2 Direct injection in my Chevy 1500 over a tiny twin turbo 3.5 all day long. While the Eco boost is impressive, it's long term durability has been starting to come into question.

Also fuel economy of the 3.5 is terrible so far

Sent from somewhere

 

[bikemike]

I'll take my 6.2 Direct injection in my Chevy 1500 over a tiny twin turbo 3.5 all day long. While the Eco boost is impressive, it's long term durability has been starting to come into question.

Also fuel economy of the 3.5 is terrible so far

Sent from somewhere

Yeah me to . But I think it could make for a fun power plant to drop in a mustang 2

 

[DELETED (Struggle)]

Yeah me to . But I think it could make for a fun power plant to drop in a mustang 2

There's a lot of potential for modding the 3.5 but they're not cheap engines to buy. Which puts them out of reach for a lot of people unfortunately


Sent from somewhere

 

[danimal]

I still like that old 350 v8 chevy.
Wish one was sitting in my truck actually.

 

[RIDE-RED 350r]

I still like that old 350 v8 chevy.
Wish one was sitting in my truck actually.

I have two....One lives in my 78 k10, carb with zero smog equipment..The other is a Vortec 350 in my 2000 k3500. They don't breathe fire like the new stuff but still a good old solid mill that just runs and runs

 

[blsnelling]

Cadillac CTS has it, if I'm not mistaken.

My '08 had a DI 3.6, as does my '12.

 

[exSW]

On the Eco boost. Someone needs to figure out how to get more work out of a gallon of fuel. If your twinturbo 3.5 is getting the same 10 mpg as your old 5.4 moving 15,000 lbs just exactly what have you gained?

 

[Backtroller]

Like everything there are pros and cons with new tech.

I have a 3.5 ecoboost in my Explorer Sport rated at 365 hp from the factory. Spend $600-700 for a computer and a new t-stat it will make a safe 420 hp with better mileage. Idles quietly and drive it anywhere. Plug it in, download the program and go.


Do you know how much time, money and effort it took to get my 1997 LT1 (350) that was rated at 310 Hp (SS model with factory ran air and exhaust) to make 420 Hp? More than I care to admit. I also lost about 5 mpg.

However, I can fix the LT1 myself though.

 

[TJ the Chainsaw Mechanic]

All the LS7's and LT4's have the direct injection. Makes decent power even without boost.

 

[Lightning Performance]

Like everything there are pros and cons with new tech.

I have a 3.5 ecoboost in my Explorer Sport rated at 365 hp from the factory. Spend $600-700 for a computer and a new t-stat it will make a safe 420 hp with better mileage. Idles quietly and drive it anywhere. Plug it in, download the program and go.


Do you know how much time, money and effort it took to get my 1997 LT1 (350) that was rated at 310 Hp (SS model with factory ran air and exhaust) to make 420 Hp? More than I care to admit. I also lost about 5 mpg.

However, I can fix the LT1 myself though.

You should not have lost anything. IMO most mods are a waste if they fail to addess two key points. One is how well do the heads acually work/flow? Two will the exhaust system and intake system and all it's parts support those heads? Exhaust before intake please.