bottom end knock from built engine. please help.

[bastarddsm]

Drop your "machine shop" and get one that knows how to use plastigauge.

HAHA! that was funny. any machine shop that uses plastiguage isn't a machine shop, i'm sorry but it is just a hack job using that stuff

 

[92redman]

HAHA! that was funny. any machine shop that uses plastiguage isn't a machine shop, i'm sorry but it is just a hack job using that stuff

Actually it's a very useful tool. You of course don't rely on it to machine the block/crank/rods, but it is very good for double checking your work. If you wanted .0015" clearance for the mains and your plastigagauge was smashed down to like .0005", you would know that you messed something up. Anybody who is confident enough in their work to not use plastigauge, is the same guy that is going to build an engine and spin a bearing eventually.

If you use it, you should never have a problem with clearances. You measured it, cut it to spec, then backed up your calculations. Otherwise you are just assuming your clearance is correct, and I would feel more comfortable knowing that when everything is assembled, the clearances are what I wanted them to be.

 

[TSIfreek]

Actually it's a very useful tool. You of course don't rely on it to machine the block/crank/rods, but it is very good for double checking your work. If you wanted .0015" clearance for the mains and your plastigagauge was smashed down to like .0005", you would know that you messed something up. Anybody who is confident enough in their work to not use plastigauge, is the same guy that is going to build an engine and spin a bearing eventually.

If you use it, you should never have a problem with clearances. You measured it, cut it to spec, then backed up your calculations. Otherwise you are just assuming your clearance is correct, and I would feel more comfortable knowing that when everything is assembled, the clearances are what I wanted them to be.

I totally agree.

 

[bastarddsm]

I totally agree.

Why would you bother using plastiguage if the correct tools are at hand. plasti guage is better than nothing, but it isn't the tool that should be used on a performance application.

 

[92redman]

Why would you bother using plastiguage if the correct tools are at hand. plasti guage is better than nothing, but it isn't the tool that should be used on a performance application.

Because there is no tool that you can measure clearance with. It's just calculations that are based on a couple of instruments that are only precise to the ten-thousandths. No where in the machining process(except for piston clearance) can you physically measure clearances.

 

[AWD~SLEEPER]

well i went to the machine shop today and talked to the owner, and he said that he already threw the barings away, so no pics. so i told him that i was on a thread and you all were talking about the oil squerters could be staying open and he told me that he checked them that they were fine. he said that everything was balanced, all oil passeges were clean, he plastigauge the crank, and checked all the clearances, and put the wright barings in. so this is all the news for now. thanks for the help everyone.

 

[anomalyinva]

What blew the motor in the first place? If the balance shaft seized, like it did in mine, the oil passages got ####ed up, and no matter how many hot tankings (went through 3 attempts) could get the shit out. As well one of the passages was warped, so it cut off flow. I ended up buying another block/crank for $150, which would have been cheaper then trying to fix it. I would suggest just getting another block.

 

[AWD~SLEEPER]

i got another block he is going to just rebuild it. but i didnt have any balance shafts. the motor didnt blow, it just had a realy bad knocking noise from the bottom end.

we're now on our 3rd set of bearings. let you know how things go.

 

[Defiant]

BEARINGS

Please.