ok.......

 

pin to small end should always be checked.. ive seen a few that didnt get "pin fitted" And had issues similar to this.

 

ill check it again, but the machine shop should have measured all this when installing the pistons on the rods.

 

I do agree.. but some machine shops dont have proper tools for this. i recommend .0008 to .0012 for high performance build.

 

all 4 pistons are out now, and just like i predicted, skirt wear is less on #2, almost non existent on #3, and no skirt wear at all on #4, wrist pins are rotating around the rod freely and not binding, and theres no play like as if it was too loose. If the #1 piston isnt beyond saving then ill have them all recoated to match. Now i just gotta figure out wtf is causing the wear.

 

Jrsc,manifold could've caused uneven air distribution causing each cylinder to run different afr,

 

muckman thought that too but i measured the cylinder temps with a IR guage on the exhaust side, and checked the plugs for signs of lean running on the cylinders.

 

bearings




#2, #3, and #4





crank journals



cylinders

 

"It's not an issue here" but you don't know what the clearance was..... did you tell them what to clearance them too?

 

It's funny you say that as all my Crower I Beams were slightly bent. They were out by .004". My machine shop told me it's more common than you would of thought as a lot of manufactures put too much trust in their CnC work been correct and don't always check the straightness of their rods.

 

I would expect a company like Crower to QC every single part, especially given their price point... I know when I ran our CNC mills/lathes I Hans checked every dimension of every part before they left for assembly/packaging

 

Maybe or maybe not... I guess we'll probably never know for sure. I'm just going by my own experience...

 

Ill have to have them checked out, i assume there's no fix for that though?

 

You can have them straightened providing they're not to far out. I'd definitely get them checked to be sure.

I'm not saying they are bent. Just keep it in mind though...

 

They can be straightened. They do it in a press with a precision pressure gauge.

 

This is just a thought, and only a assumption. But this motor was boosted right from the start.
Taking into consideration the manifold was opened/ported, it could have distorted the air flow to each cyl, more air flow to different cyls or vice verse. That could have something to do with that.. but i honestly dont see how 1 bore could be THAT much out from the machine shop.. due to the nature of the actual setup and it being beat on right away, some of that wear should be expected.. I'm interested to know how out of round that bore actually is, and if it is, why.. I'm also interested to hear about this "bent" rod theory as well.. I agree with wantboost and Rob, you would think a company like Crower, Eagle, Manley etc etc, all check their rods for straightness..

 

Well the manifold was port matched to the gasket, and the spark plugs, and even the exhaust manifold were checked, i literally had an IR thermometer with me after drag runs to see if i had a cylinder running hotter. #3 was the only one that needed 1-2% more fuel to get it even.

Only thing I can really think of at the moment is either the rods are slightly tweaked, which ill have checked out. Or, which would be probably the most LIKELY scenario, he didnt bore/hone the block with a torque plate, which is something you really should have on a open deck block because the sleeves can move ever so slightly.

 

The porting of the blower plus the porting of the manifold could have disturbed airflow. however, without you having individual egt and lambda sensors for each cylinder, we'll never really know exactly what each cylinder was doing.

Maybe you can look at your plugs and get a rough idea though

 

plugs were flawless, even flawless when i had it dyno tuned, if anything, that manifold and blower has smoother airflow after we got done with it.

 

when i originally got the JRSC kit, the all the ports on the manifold had casting shift to the upper left of the ports matching against the head, i had to correct all of that to even get them to line up properly. The casting on the outlet of the blower was dogshit, theres only an 1/8th of an inch removed and blended on that outlet.

 

Supertech pistons are 4032 aluminum aren't they? .004" clearance would be just fine for a 2618 alloy, but very excessive for 4032.

 

On their specification sheet they give a minimum clearance of .0024 and a break in becuase they are coated for .0004, if it was just too loose, I dont understand why #1 wore badly and #4 didnt at all.

 

How well do you trust the machine shop that did the hone? If you get a chance, ask what grit stone they used.

 

He does alot of the work for most of the south jersey area, and alot of performance vehicles, and has a good reputation. I specifically requested a 400 grit stone, and thats what i got.

 

what place did you go to ? hangers auto did my buddys teg and did a great job i went to fones performance , recomended by randy and i wasnt very please with what i received i asked to know what clearences i needed for bearings and all that , it took 2 1/2 months to get my block crank and rods back, when i picked it up i asked the guy where it the paper work with my clearneces he was like hold on let me ask the tech, guy came out and was like everything is standard turned around and walked away, they where very pricey also ended up costing me 950 , hopefully its one of those you get what you pay for things