K&N flame arrestor

[Neted]

Ok I know it won't do much, but I bought one anyway. I have a 2006 5.7 Gi-F which is fuel injected. I bought the correct flame arrestor according to their web site, but this thing isn't even closet the base unit is much bigger then the stock one and the stock unit has three connections whereas the K&N has just one center connection. Anyone else try this?


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[Bondo]

Re: K&N flame arrestor

but this thing isn't even closet the base unit is much bigger then the stock one and the stock unit has three connections whereas the K&N has just one center connection.

Ayuh,.... My guess is, ya bought the Wrong 1....

Did ya find it by Serial number, or what,..??

 

[Don S]

Re: K&N flame arrestor

I just looked at their site and didn't see that they had any flame arrestors for the 5.7 Gi engines that are MPI, only TBI.

 

[Neted]

Don, please excuse my ignorance but what does MPI, stand for? I bought the one listed for EFI. It looks like they may have some sort of adaptors available. What is it that I have?


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[rte592]

Re: K&N flame arrestor

EFI = Electronic Fuel Injection

MPI = Multi Port Injection

 

[Don S]

Re: K&N flame arrestor

TBI = Throttle Body Injection

Your 5.7Gi-F is an MPI type of EFI

 

[TilliamWe]

Re: K&N flame arrestor

Don, please excuse my ignorance but what does MPI, stand for? I bought the one listed for EFI...

EFI is a "catch-all" term, and doesn't do diddly squat for actually describing what type of fuel injection system you have. (Although it does rule out the mechanical fuel injection used in the 1950s by GM)

The filter you bought is most likely for TBI, which looks A LOT like a carburetor. Your MPI has 2 fuel rails and 8 individual injectors, and has nothing that looks remotely like a carburetor. Just for giggles, find a friend with a 4 barrel carburetor on their GM car/boat engine, and see if your new filter would fit it. If it does, you have the wrong filter for your MPI engine.

 

[Tail_Gunner]

Re: K&N flame arrestor

opps

 

[Howard Sterndrive]

Re: K&N flame arrestor

Ok I know it won't do much,

but do you realize it will do nothing?

drive your boat at WOT, have someone remove the flame arrester.
does it accelerate?
of course not.
how can you improve on that?
get your money back

 

[wca_tim]

Re: K&N flame arrestor

you'de be suprised how restrictive some of the factory flame arrestors are... it is not unusual at all to pick up a few hundred rpms if you go to s less restrictive one - as long as you can fatten the fuel mixture up. Of course if you just go to less restriction and don't compensate by rejetting, it's not goign to do anything. try before and after with a wideband set-up in the exhaust, you might be surprised. just my two cents

 

[Don S]

Re: K&N flame arrestor

you'de be suprised how restrictive some of the factory flame arrestors are...

That was true back in the 60's and 70's, maybe into the 80's. But the manufacturers actually have it figured out here in the 21st century.

 

[bruceb58]

Re: K&N flame arrestor

as long as you can fatten the fuel mixture up. Of course if you just go to less restriction and don't compensate by rejetting, it's not goign to do anything.

Besides the fact that this K&N is a waste of money, you do realize that the OP has fuel injection right?

 

[wca_tim]

Re: K&N flame arrestor

Besides the fact that this K&N is a waste of money, you do realize that the OP has fuel injection right?

Besides the fact that this K&N is a waste of money, you do realize that the OP has fuel injection right?

yes I did see that he had an mpi set-up, ie recalibration required.... I wasn't singing K&N's praises nor saying that he will get a benefit from adding it. My point is that to assume that there won't be a benefit from a change in air intake is possibly short sighted. I've been really surprised more than once at the benefits that can be gained from changing the geometry and restriction of air intake combined with careful tuning. I've been spending more of my playtime chasing late model car performance lately and have been very pleasantly surprised at how much improvement there is to be made in what were assumed to be well designed air intake set-ups.

definately not picking an argument, just makin the point that you often never know until you try it... (take the original filter assembly off and see if it leans you out, if so, there is possible gain to be had - although it's never as cheap or as simple as just a flam arrestor...). respectfully submitted...

 

[joewithaboat]

Re: K&N flame arrestor

That was true back in the 60's and 70's, maybe into the 80's. But the manufacturers actually have it figured out here in the 21st century.

My 1996 flame arrestor looks the same as the ones i had from the late 70's and 80's ?????

 

[joewithaboat]

Re: K&N flame arrestor

Anyone who has spent any time in a dyno room and or tuning with a wide band knows slight air path changes can make major power increases. Ive seen an air bridge and filter, along with slight tuning tweaks make 20 hp at the rear wheels on a 400 hp car. Im not convinced K&N filters filter well when first cleaned and re-lubed but they usually do make more power.

 

[Tahorover]

Re: K&N flame arrestor

but do you realize it will do nothing?

drive your boat at WOT, have someone remove the flame arrester.
does it accelerate?
of course not.
how can you improve on that?
get your money back

Some of us boat in less than clean air! The California delta is surrounded by farms and there are dusty days!

 

[bruceb58]

Re: K&N flame arrestor

yes I did see that he had an mpi set-up, ie recalibration required....

Absolutely not required.

Please explain what you think he is going to recalibrate. If you saw he had an MPI, why did you say to rejet?

 

[wca_tim]

Re: K&N flame arrestor

Absolutely not required.

Please explain what you think he is going to recalibrate. If you saw he had an MPI, why did you say to rejet?

Sorry for confusion, it was late when I typed the response. I have a (possibly bad) habbit of referring to any change in fuel metering / air fuel mixture calibration as rejetting. For the op to change the air fuel mixture table properly, the ecm would have to be reprogrammed.

Regarding taking the original flame arrestor off, I was only referring to doing so long enough to see if it made any difference in the air fuel mixture. If ti leaned out, it is clear that simple restriction is reducing airflow through the air intake.

it is obviously a topic that is more complicated - air intake temperature, velocity, flow path, etc... even the way you oil and clean a k&n type filter can have a big impact. I can tell when the similar type element that's currently in my corvette is getting dirty because the fuel mileage drops from 31 to 26 on the highway over a relatively short time period... it is also made a significant difference over the (supposedly optimized) factory air intake assembly. for individual, relatively small changes like this, it is really hard to tell what the impact is without a dyno or wideband (much cheaper and easier to access these days than ever before).

The open mesh looking flame arrestor that was installed on a 90's era merc 350 I bought, aside from offering pretty much no protection from dust, turned out to be significantly more restrictive than the gaffrig I bought and replaced it with later. I was really surprised that it was so restrictive.

Hopefully this is helpful. Cheers

 

[bruceb58]

Re: K&N flame arrestor

In a fuel injected engine, the restriction of an air filter or spark arrestor will not change the fuel mixture. It can affect top end because you are limitimg the maximum flow of air reaching the engine but it won't affect fuel mixture or fuel economy. If it were the case you would have to recalibrate the ECM when you changed altitude. Mixture is calculated based on the density of the air flow.

If you really think your plugged up air filter is hurting your economy in your corvette(assuming its fuel injected), read this:
http://www.fueleconomy.gov/feg/pdfs/Air_Filter_Effects_02_26_2009.pdf

 

[wca_tim]

Re: K&N flame arrestor

In a fuel injected engine, the restriction of an air filter or spark arrestor will not change the fuel mixture. It can affect top end because you are limitimg the maximum flow of air reaching the engine but it won't affect fuel mixture or fuel economy. If it were the case you would have to recalibrate the ECM when you changed altitude. Mixture is calculated based on the density of the air flow.

If you really think your plugged up air filter is hurting your economy in your corvette(assuming its fuel injected), read this:
http://www.fueleconomy.gov/feg/pdfs/Air_Filter_Effects_02_26_2009.pdf

I can tell the air cleaner element in my ls engine needs to be cleaned when the highway fuel economy starts dropping... 80 mph, 2200 rpms, usually 30 mpg on flat road, gets down to as low as 25 when element needs to be cleaned. usually around 3-4k miles between cleaning and oiling. it is running richer than ideal when that happens (it's only fair to mention that the car and tune aren't stock). the ecm can modify the tune in response to changes in signal from maf and oxygen sensors the only major relevant point(S) for this discussion are that such elements change significantly with use after cleaning and oiling and that electronic fuel injection programs can only account for so much deviation from optimum factory anticipated conditions. Once you change the air intake and other variables very much, you may have to retune to to realize potential gains (or to avoid losses). the report you linked above is a good read - I enjoyed it.

the long and short of it is that the op's boat will run fine with the k&n or the original flame arrestor... we all know that it takes a lot of gain to make much of an noticable impact on a boats performance...