dcrep06

jesus, how did you spin a bearing!? havent seen many people do that on these. maybe one other lol. but yea i know thats what the records go off of, dont really get why there are hp records though when no two dynos read the same. so many variables to add into consideration lol. but yea im just doing the cams to run e85 instead of that e47 bullshit lol. but i will run a 93 tune for track days since im going for both drag and track like youre doing. we have some fast tracks out here with low DAs, so ill see you at the finish line :P i hope haha

colodude18

iTrader: (4)

Oil starvation at the road track...running Powell's race oil pan now and an extra half quart of oil

dcrep06

well i figured starvation :P lol. but just dont see it happen much with these cars. i was kinda like wuuuttt? lol. but hmmmm, maybe i should look into this oil pan then since i plan on tracking it too. how was the block? able to hone it or was it toast?

colodude18

iTrader: (4)

The block, pistons and rods were fine.
Main bearings, rod bearings and crank shaft were toast and were replaced.
I took the opportunity to upgrade to forged pistons and rods in the process.
We also replaced the oil pump for safety just because of the amount of debris in the oil. Some of the metal chunks were an inch long!

cw383

iTrader: (6)

Did you need to bore or hone your block prior to piston replacement?

colodude18

iTrader: (4)

Had the work done in a local performance shop. It did go to a machine shop not sure what they did to it.

dcrep06

thats crazy! but yea, thats a good idea to do the pump while your at it and not risk it lol. so stock size 86mm pistons and stayed with a 86mm?

sounds like stock bore so probably just honed it.

soundjunky

iTrader: (4)

try to think of it this way:

boring = oversizing the bore to accomidate a larger piston; done for increasing displacement, or because of exessive clyinder wear which necessitates an oversized piston

honing = this is cleaning up the bore; this is done when ever you are going to be using new rings, so that they have nothing to catch on, and are able to seat properly.

dcrep06

i dont think he was asking the difference of them lol.

soundjunky

iTrader: (4)

but knowing the difference, might help someone understand when or why they are done.

09CobaltSS1

It's always recommended to hone the cylinders when installing new pistons and rings. Without a fresh crosshatching the new rings will never properly seat and develop their our wear pattern.

ECaulk

iTrader: (6)

I would put money that Trent honed the cylinders, given your leak down is so low

colodude18

iTrader: (4)

Yeah reading all the background info I'm 99% sure that's what was done.

BTW here's a picture of said leak down test. All cylinders were the same. Pretty damn good I'm told...

dcrep06

true true haha

soundjunky

iTrader: (4)

I looked and can't find any videos of cars running these, are there just not many people running these cams?

I realize that cam phasing (when operating properly) will miimize the effect of lope/overlap ~ and I would expect that rolling in 5th @ 40mph/60kph would be jerky ~ but that's just because you're lugging it...

A part of me would love to just jump in head first... for the mean time, I'm content to see what everyone else is doing...

Wert842

iTrader: (3)

Have you driven the car in 5th gear at 40mph stock motor? Ya it sucks. Just imagine it with a different phasing. It'd be complete hell...

soundjunky

iTrader: (4)

just checking, but you did know my comment was regarding the following quote (posted earlier);

dcrep06

man, 5th gear at 40mph? i never have done that even with my 4.45 hahahahaha

PrincessTurbo

It's called dropping a valve which causes the chain reaction and " clearance ". We're talking close tolerances here. If you tap a valve and it falls into the cylinder guess what happens next! Do valve springs help ? It's possibly the weakest link when ******* with the head , my personal experience says change valve springs if adding cams or reduce your timing if you're running aggressive regrinds. Or even just the fuel lobe cam. This is my personal experience. My first LNF lasted 45 thousand miles tuned and on e85 until it had the porous block issue which GM replaced the engine with an LDK " franken blocks" The engine lasted about 7 thousand miles with ZZP's fuel lobe cam and Intercooler.

Take it for what you will but it might save some people the hassle of rebuilding a once perfect LDK with a few thousand miles on it. Can't bitch engine was replaced under warranty , have a new block forged internals arriving soon .

The engine it was replaced with every once in a while made a " timing chain noise" on start up meaning possible oil starvation or something wrong with the engine from day 1. within a few months of having the new engine my warranty expired because I bought the car brand new in 08.

soundjunky

iTrader: (4)

umm,
if you have piston to valve contact after a cam change then someone screwed up and timed it wrong.

InfraRedline

iTrader: (4)

I think we can all agree that valve springs are always a must when installing more aggressive cams. I don't think anyone in here would be running larger cams on a stock valvetrain. An intake fuel lobe cam is one thing, but when going with higher profile cams I would hope its common knowledge to upgrade springs.

Bluelightning

iTrader: (8)

Yep. Do it right or don't do it at all.

soundjunky

iTrader: (4)

agreed.