With all the recent post of engines loosing cyl 4 i thought it might be a good idea to try and find a solution.

First off i want you to read this article wrote by RRE
Eclipse Fuel Pump Tech Tips

With all the post and input from everyone, i think were leaning towards cyl# 4 damage being caused by a lean condition from diminishing fuel pressure in the rail.

I believe the article above might shine light on the issue, as u can see the flow rates changed by as much as 60lph just from a 2 volt drop at the pump. all the engines posted with engine damge were somewhat modified, the walboro pump flows enough for 500 bhp at 260lph but at 200lph that is somewhere around 380-390bhp. im sure all those motors could have easily been making more than that.

Also i brought up the idea of a twin entry rail, there cheap to make and anyone with any motor skills can do it, this wont fix the problem but will give your engine a fighting chance! just going to a larger rail will only make things worse as it will bleed down presure even more due to its larger volume.

I understand the cars in the article were 1g and 2g dsm's but if both those vehicles were affected good chance ours is also, i think someone needs to go grab there voltmeter and go measure the voltage at the pump while its runnign adn been running for awhile. this will the the current heat up the wires a bit so we can see the maximum effect of this voltage drop. we dont need to fix the problem in such a way as the article states, but none the less i think it needs to be adressed.
most of us here cant afford a blown engine but still have asperations of huge hp motors.

BTW if your a dsm guy please dont post on here that you already knew this, this is for those who dont know.

 

Good find man thxs for the tips. I will be trying this out ,cause I like my engine the way it is now !!!

 

Ohya I will be taking some readings with my Ohm Volt Meter and see what I am getting.

 

This is what I was eluding too in the other thread related to this issue.

thanks for finding that link...

 

i know theres some inaccurate statements in my post, most of it was for example purposes only. the point was just that these car had injectors and upgraded fuel pumps that should have been enough for there power levels, yet they leaned out for some unown reason, poor tuning could be the cause but the fact the the #4 cyl was the victim each time is too much coincidence for me.

maybe its the rail (doubt it) maybe it is the voltage drop???

i think someone like dave B could help with this one as he no doubt has tunes more 4g63's than most and has built lots of power with many different combo's im hopeing he'll have some sight on this issue. i think hes using the walboro on his evo making 440hp+, with no issues "yet".

in my opinion if it is the voltage drop, i would probably just go to a larger pump that will flow enough at a lower voltage to supply a motor making say...500 hp. i dont like the idea of running all that wires and junk, nomatter how clean u do it, i prefer the factory look!