chiromikey

IMO, logging AFR's isn't going to give you enough info to always prevent catastrophe. EGT's are the only way to see what's really happening and even then I don't think individual EGT's can even be checked on a stock motor due to the log style exhaust manifold. It would take a lot of effort to watch #8 by itself.

turbo97se

Wow .. drama! I went an extra step and moved the feed to the centre of the rail at the back of the engine. Can't prove that it will help. It just seemed suspicious that the feed comes in at an angle on one side.

chiromikey

I went that route also...

turbo97se

You're right on the money here … AFRs are too slow. EGTs much faster. Could consider putting in EGT probe right at number runner 8 if that is the weak one.

Like your rail style .. better than mine, mine Tees in without the sloping.

Joncl

egt probe on each bank would be great but this thread was about a stock car blowing not a modded car that is why I asked about the link to threads about stock cars popping

turbo97se

Really? I thought it was about looped fuel rail install problem like the title states

Joncl

Ya from looped fuel rail it went to stock engines popping

chiromikey

Yeah, it got side tracked but I'm still kinda interested in reading about these "stock motors that have been popping #8 for years now".

Joncl

Me too

e55amgrocket

#8 isn't just a fuel issue. It's compounded by being the hottest cylinder to begin with (furthest from water pump) and if anyone has checked temps with a heat gun they would see it's always warmer than the other cylinders. The rail inlet being right there doesn't help either obviously.

EREBUS

Got a little busy with the holidays......I'll find some links, mikey. Just hold on to your little ponies. lol

chawkins2001

Did you get the rail from BI-Performance (me) ?

EREBUS

I bought mine from a member here that goes by roverron. Brand new and never installed.

chiromikey

Lol...of course you will...

Joncl

lol

EREBUS

^^^^^kinda ironic, don't you think mikey? you posted this 5 years ago on how a stock motor can lean causing an engine problem. was this #8? and yet, you keep talking your sh*t....

https://mbworld.org/forums/w211-amg/...gine-help.html


http://www.benzworld.org/forums/gene...placement.html


http://www.benzworld.org/forums/w221...oke-oil-2.html


http://www.benzworld.org/forums/w210...ed-piston.html


http://www.pistonheads.com/gassing/t...nions%3F&mid=0

Does everyone with a #8 piston failure post on the internet? No. Cylinder #8 on the M113 and M113K is the leanest and hottest. If the engine was to lean or overheat, #8 is the most common to fail. This is what the techs at MB are telling me. Why do simple mods to our engines cause #8 to fail first, also?

My point is that #8 cylinder is the most sensitive to fuel starvation.......even on stock motors. Sorry if you don't agree?

EREBUS

spit it out and get off your knees. you are embarrassing yourself, boy.

Joncl

first ,even to think something like that makes you a ******* of the highest caliber so stop and get to the matter at hand. second , those links actually show only 2 55k engines popping and with one he's a second owner and doesn't know if it was ever modded so damage could have already been done, the last guy also was a 3rd owner but seems like it was always stock so maybe you have 1 guy that popped on a stock 55k motor

simon1966

I like the look of this principle, is anyone modding these on a commercial basis? Would this be even better if looped or is it not necessary?

cm60k

FULLY AGREEEEEEED, WITHOUT DOUBTING.....

ZAYED,,

chiromikey

Thanks for wasting my time...but at least you proved yourself wrong so I didn't have to. Your exact words were "#8 has been popping on stock motors for years" and you came up with a post of mine discussing a possible lean condition having nothing to do with #8 or popped motors.

Nobody ever argued that 8 isn't the weak link, just that it doesn't come into play often on stock motors like you falsely claimed...

chiromikey

Floored Fab did a few but is only taking select customers now. It wouldn't be difficult for someone to do this if they have the right tools/ability. I didn't loop it since it already takes care of the low pressure situation at #8 on motors that need more fuel than stock.

simon1966

Thanks for the info. I'm in the UK so don't think I would count as a 'select customer'!

My car isn't currently heavily modded, pretty much EC stage 1 with s/c pulley, map, HE, Bosch 10 pump, LFR7AIX cooler plugs, bmc filters. Also has x-pipe, resonator delete and quaife LSD. Power isn't massive at 550bhp at the wheels and 618lb/ft on the dyno. I am looking into the next steps which will most likely start with headers then split cooling.

I was thinking a looped or modded fuel rail would be a good idea before I do anything else - any thoughts guys or is it not necessary in my current state of tune.

chiromikey

I think you're right to consider a rail as your next mod but I'd also consider upgraded oem blue injectors or the 550cc injectors if your crank pulley is larger than 180mm (or whatever the s/c pulley equivalent is).

cm60k

Looped rail is an Excellent option for cylinder #8 starvation during hard WOT situation,

MB done that in their brilliant SLR Engine with special injectors & as remember 5.0bar regulator.....



ZAYED,,