mattster03

iTrader: (22)

I would think the compression test would have showed if the rod was bent... I'm not pulling the heads, I'm moving forward on getting the car ready to race

Specialized

iTrader: (15)

.001-.003" or so difference in OAL will not show in a compression test..

Im sorry but Im a manufacturing engineer so Ive got fluid & machining expertise on my side. .001" difference in OAL could only be a .0007" deflection in the "xy" direction of the motor.


.0007" deflection is enough for a 6 inch+ length that the bearing will eventually side wear and then trash the crank, causing catastrophic engine failure.










I was afraid this had happened to me with my GTP.

I too, bought rebuilt injectors and a tuned pcm from ZZP back in the day.

I had a 3.2?" pulley, injectors, headers, ported tb, and methanol injection

few weeks after installing injectors and PCM motor blew up, put a rod through the block, etc. I never even tore it down. I was too upset & young to realize slash care about anything other than the money I spent on the car plus the mods practically broke me, then I didnt even have a car. Sold it to someone who had wrecked their car, and they came and got it.

ZZP assured me that with the exact mods I had the pcm they sold me would be the right one. They said I didnt even need to get it dynoed if I didnt care about anything besides spanking 'camaros'. Anyways I would definitely pull the motor and get everything measured up. Measuring is cheaper than rebuilding a blown up motor.

mattster03

iTrader: (22)

Well as a mechanical engineer... I think that the starter tab breaking acted as a mechanical 'fuse' limited the amount of force put into the rod. Its all speculation, but the compression test in my mind would be an indicaor... I feel comfortable running my car for the season.

Specialized

iTrader: (15)

You must be one of those engineers that think a slip fit can be achieved with +/- .005 tolerances. And you probably buy critical engine parts from china.


Good day sir.


At least I won't chime in on your rebuild thread and say "I told you so"

OldCobraGuy

iTrader: (2)

That is one heck of an assumption Matt. The compression test may not tell you a thing. That's the point we're making. The result of us being wrong is you are out some time and gaskets. If you're wrong, you're out thousands of dollars, and maybe your life if you oil down the track in front of your tires at 110 mph. See our point? Now is not the time to get skimpy with your efforts.

89 formula350

iTrader: (8)

https://ls1tech.com/forums/generatio...ked-block.html


a comp test wont tell you a thing unless you have a major bend or twist

mattster03

iTrader: (22)

Sorry I did not experience a cracked block, and I believe even a small bend would show up on a compression test and I would also show itself in vibrations and/or noise. Here is a picture of the starter that saved my ***. Again, the car did not start, when the #5 piston reached it's compression stroke I believe that the force that broke the tiny little tab on the starter immediately disengaging it from the flywheel was not great enough to bend the rod. As an additional help to the situation, the huge torque multiplier of gear ratio of the starter to the flywheel means that it put that much more force into the starter and not the rod. Here is the picture of the starter that I personally believe saved my engine... again, I am speculating and only time will tell. Here is my experience so far: I had the car tuned yesterday for the new head/cam/injector combo. I have been revving it up to well over 6K with no issues.

O2Form

I'll tell you what suprises me, THAT YOU INSTALLED THEM! Are you crazy? You get parts that loook like that you DO NOT install them!

mattster03

iTrader: (22)

Yeah, obviously hindsight is always 20/20. These were SUPPOSED to be completely rebuilt, tested, inspected and flowmatched injectors... it's not like re manufactured injectors are completely unheard of. In fact many vendors on this forum sell them as well. Hell, people buy USED injectors all the time in the classifieds that theoretically should be WAY more dangerous than buying a reman'd set. Unfortunately I made a stupid decision by convincing myself that the exterior crappy paint job should technically have no real affect on internal performance. Again hindsight says that should have been an indicator .

As a wise man on another forum I frequent reminded me "If it looks like a turd, smells like a turd, and feels like a turd... did you really need a taste test"?

O2Form

Come on now, those injectors were NOTHING like anything anyone ANYWHERE anytime woooood install in ANY engine.

I have a really nice bridge in your area for sale.

mattster03

iTrader: (22)

that's funny... looks like they've sold a few sets since me...

http://cgi.ebay.com/ebaymotors/ws/eB...=STRK:MEWNX:IT

you guys can keep arm chair second guessing me, trust me, I'm not happy that their product didn't live up to their guarentee, and I probably won't buy another used part in my life. It is what it is.

O2Form

you got someones returned used injectors that needed rebuilding is the only possible answer to this. They should take care of this.

Specialized

iTrader: (15)

https://ls1tech.com/forums/generatio...cting-rod.html

If you havent blown it up yet and have any possibility of removing head from ***..

mattster03

iTrader: (22)

There are so many things that are different with this guys situation.

1. His starter did not immediately break and disengage.
2. His engine started.
3. His engine was making noises afterward.

O2Form

I've had bent rods that you couldn't see to the eye were bent but the bearings showed it quickly. The bearing don't last very long and a bent rod will knock.

mattster03

iTrader: (22)

I agree with you fully on this... I am closely monitoring my engine for any signs/sounds of rod knock. I have well over 300 hard-driven miles on the car since the 'incident'.

mattster03

iTrader: (22)

Funny, I left an e-mail with the vendors who sold me these injectors and haven't heard back...

"I recently purchased a set of clean and flowmatched ZZPerformance
injectors from ebaymotors auction #XXXXXXXXXXX , tracking
#XXXXXXXXXXXXXX . To begin, I was severly disappointed in the
condition of the injectors, they were poorly spray painted (not dyed
as, with overspray all over the pintle areas of the injector and badly
chipping allowing white paint flakes to enter the injector filters and
other critical areas. After having the injectors properly installed
on my car by a professional we came to find that one of the injectors
was stuck wide open when the injector filled one of the combustion
chambers with fuel causing the engine to hydrolock during startup
breaking both the starter and potentially bending a connecting rod.
Your product did not live up to the guarantee stated on the auction
page to flow within 2.5% and did not perform as new... and if it were
properly re-manufactured and checked as claimed would have not caused
this extensive damage. The injector was confirmed to be stuck wide
open once removed. I am a very unsatisfied customer! Please let me
know how to return the injectors for a full refund + shipping. In
addition, please explain how you plan to rectify the situation with me
to keep your good reputation as a high quality vendor on eBaymotors,
clubGP as well as other automotive performance forums and. Thank you,"

O2Form

Face it you got cornholed, PLUS you let them. Next time think a little more. I've been in your situation and got screwed too, its hard to believe there are people out there that woooood do sheeet like this but today its common.

LilJayV10

iTrader: (39)

I'm sorry it happened and I hope there is no long term serious damage. But I have to ask.

Why would you install them when they looked that bad? I understand you were in a hurry and wanted to get on the dyno but.....

usmcz28

iTrader: (3)

I posted a link to this thread on ClubGP to see if we could get you some help from ZZP a little quicker