quik95lt1

iTrader: (7)

Well as alot of you saw the post i put up earlier this week about the grendaded rotor and cap........it gets worse..........

i have a fresh air hose hooked to engine vacuum that pulls fresh air through the cap at all times.......

i replaced the cap and rotor and fired the car up tonight........things popping and farting through the exhaust like i doesnt' want to run.........shut it off after about 8 seconds..........plugs are fine........seems to be compresison leaking out of a cylinder into the exhuast system...........

what im thinking now is a piece of the rotor when it shattered got sucked into the motor on #8 cylinder......all i need is to hang a valve open .040 and i will make contact and bend a valve.....which im thinking is what happened.........apparently the piece made it in past the intake valve and got stuck in the exhaust valve on the way out............gonna run a compression test tomorrow and if its what i think start ripping it down friday night so i can fix it and get it to the shootout.........

lucky me lol.......gotta love racing.........

ill post up tomorrow what the compression test shows........im expecting about 90psi on cyl #8 instead of the 270 it should be

93Z2871805

iTrader: (5)

That's not cool, best of luck. Hope it's an easy fix.

SoxXpupPeT

iTrader: (34)

Shesh man thats extremely shitty! Hopefully its something much easier to fix then a bent valve. Good Luck

3.8redbird

iTrader: (3)

I thought you were going with the coil per cylinder setup?

shbox

With the filter/flow reducer and check valve on the opti vacuum hose, how does any foreign matter get sucked into the engine? You can't run straight vacuum to the opti. It can cause the cap to collapse in on itself (rotor and cap destruction).

RamAir95TA

iTrader: (2)

Mike V. doesn't use an optispark.

quik95lt1

iTrader: (7)

what joe said^ lol...........its got an msd pro billet dizzy on it and i vented it to aid in reducing cross firing in the cap because its so small.......worked perfectly fine untill this happened...........


going to compression test it tonight.........if my assumption is correct the damage should be on cyl 8 where the port for the vacuum is in the intake........im figuring worst case scenario the valve bent and damaged the seat.....so it would need a valve and id send the head back to AI for a seat repair...,........ill make it to the shootout but my testing time just got wayyyyy reduced........

Paul Bell

iTrader: (9)

Hey Quick, looking at your sig, you must be an experienced builder and motorsports enthusiast who knows what he's doing but I was thinking what shbox was with the vacuum line size. And you are assuming this little piece made it all the way to the valves in cylinder 8.

As freshman as this may be, it sounds to me like you've simply mixed up the spark plug wires for 6 & 8.

quik95lt1

iTrader: (7)

no i ran a 3/8" vacuum line and its only about a 4 inch piece of line to the intake runner, i was moving alot of air through there.......and with a Piston to Valve clearance of .040 it doesnt take much of a piece to cause issues for me....hanging a valve open .040 will cause piston cotnact..........and as the rhynite material it would've stayed hard even under a pretty high temperature.........

and trust me i checked all the plug wires lol......a few times.......and i also verified my timing at 32* BTDC so thats not it either.......

again this is just an eductated guess at this point we will see what a compression test yeilds for results tonight........

shbox

Still, running full vacuum to it does not sound like a real good idea (especially if it can suck foreign matter into the engine). Apply the same rules as for the opti. Seems common sense to me.

quik95lt1

iTrader: (7)

well full vaccuum for me is about 5 inhg if im lucky lol...........as for the debris thing i screened the fresh air side of the dizzy........but i didn't think about the rotor grenading and sending in pieces like that............needless to say im going to filter the vacuum side now..........

Paul Bell

iTrader: (9)

Sounds like you've checked everything. Good luck!

LOVE that color!

quik95lt1

iTrader: (7)

thanks!!! ill be posting up pics of what i find and the fix

Mystery Bird

iTrader: (7)

It's a crappy way to learn isn't it? Guess you wont be coming to LVD Sat.? Good luck man.

ZFreie

Atleast it wont happen again now. The world is trying to prevent you from kicking ***, its lame. Hope you get it all fixed quickly!

quik95lt1

iTrader: (7)

prob not unless the compression test comes out ok and it winds up being something stupid......

yea tell me about it and its doing a pretty good job at it!!!

thanks!!!

gatorhead

iTrader: (4)

Try buying one of those kits for the shopvac, if ya dont already have one, that are for detailing. You could then remove the plug (have to anyways) and insert the tip of that tool and suck the cylinder out. If there is anything in there that will get it out. Just a suggestion.

96lt1m6

iTrader: (31)

Sorry to hear this news hope its an easy fix bro

quik95lt1

iTrader: (7)

ok good news!!!!!!!



......compressoin test shows 265-275psi on all 8 lungs..i went home and did it at lunch time i had to know lol......no bent valves or internal issues!!! also just noticed that the base of my dizzy is scored....looks like the dizzy got pushed about .5" foward when the rotor grenaded.....its about 40* off which means the rotor was prob sending spark to the cylinder behind where it should have been if it was sending it at all........and it seemed like retarded timing when it was running too.......looks like possibly and easy fix!!!


gotta love the good ole bulletproof LT1 mechanical parts!!!!


gonna re-phase the dizzy tonite and i could be back out terrorizing the streets soon !!!

draggin97s10

iTrader: (2)

I was gonna say your timing was just off, like 180 or apparently 40 off. All you gotta do is rephase. I bet thats a relief.