phaphon

hey i was wondering could i have had a boost spike and that cause it to crack my sleeve ? cause i just rebuilt my motor and made a bad decision and decided not to use block guards. my set up consists of a rebuilt bottom end just with arp rod bolts and head studs. Did not really touch the head.My turbo setup is a turbonetics turbo, piping, 750 rc injectors with ebay wg and bov. It was tuned on chrome but my motor siezed up when i brought it home so the tune was not finish'd. i changed the crank cause it had spun bearing.Then everything was good for about 200 miles i decided to step on it which i did not even floor. Then it died on me so i started checking things and i thought i had a blown headgasket since there was milky oil so i pulled the head off and there it was a crank and broken cylinder wall

AlexDphoto

so you said it was not completely tuned and you attempted to beat on it and youre wondering why it has broken on you? Am I understanding this completely?

blackeg

yes you could have had a boost spike. happened to me a long time ago, cracked sleeve had a boost spike. crome has a boost cut, use it next time.


the block guard is a waste, not having one didnt cause you motor to crack. also, dont use the ebay wg, its not worth it

phaphon

yeah it was not completely tune and yes i did beat on it. But i didnt beat on it like crazy i did not floor it and was shifting really slow.And i did not beat on it daily i didnt even drive the car daily i just drove it to my friends to tare down his motor for him then i was gonna go finish the tune. And yeah this time around i do plan on upgrading my wg and i guess im gonna be using a block guard since i plan on buying another dd with my income tax.And the reason i brought up the block guard is for some odd reason my friend decided he wanted to boost 40psi on his stock gsr block.He had block guards and the only thing that crack was the pistons

00Red_SiR

It sounds like you had a number of problems because of not understanding and paying attention to details when building a motor. If your motor seized and spun a bearing, it probably wasn't clearanced correctly. The tune is critical in a high performance motor, especially a boosted one. A block guard is not needed and wouldn't have saved anything. Cracking a sleeve or a piston is always a result of the same thing... the TUNE. Before you start building anything again, you need to step back and figure out what went wrong with your motor each time, so you can learn from it and not repeat your mistakes. It sounds like your buddy needs to educate himself as well before someone tuns him loose on another build.

phaphon

i didnt know you had to measer clearance when rebuilding a motor back to stock with oem parts?? cause i lookd up the measuring clearance they said you did not need to measure it and i think my bearing spun then seized the motor the first time cause when i did a oil change for some reason when i turn the car on it reved up by itself and i did not think to turn off the motor first so i just tried to get the rpms to go down but when i got it to go down i had a rod knock already then it ran for a couple of seconds then seized up

GranDaddyPurp

block guard wont do anything for you its a cosmetic piece, if your sleeves are gonna crack the block guard wont do anything to stop it. it was your car being untuned and you beating on it, is my guess

good luck with your next build but dont go and purchase a block guard cause u think its gonna save your next block cause it wont.

00Red_SiR

...and that's why your engine seized/spun a bearing. Checking your clearances when building a motor, even a stock one, is critical to it working great, or breaking down. That's the lesson to you, regarding what happened, now you'll know to always check everytime you build something right?

rev-speed

it doesn t matter how slow u shift
when u go into boost

and 40psi will blow a headgasket or snap a rod on a stock gsr

dcmatt

iTrader: (7)

You do know that oem bearings come in different sizes so you can create proper clearances right?

http://articles.evans-tuning.com/200...e-build-video/

check out these videos of a GSR build. same principle for clearances and measuring apply. you can read on this page that there are 7 different OEM bearing sizes.

phaphon

yeah i do know honestly i was just to lazy...and also how would bearing clearances have anything to do with my cylinder walls breaking??? just wondering not tryin to sound like a smart person..... also when my cylinder walls crack i was still able to drive it and it didnt make no noise or what so ever but it just drove stupid

phaphon

yeah my friend was the one boostin 40psi im not sure what made him want to boost that high im sure he was aware that something was going to go wrong but i was only boostin 8psi

phaphon

and honestly i have watch'd the video about three times. I still dont get how to measure the clearance.If someone would be willing to try and help me understand that would be cool

mechanix619

Few things wrong:

Block guard
eBay BOV and WG.
Not having a full tune


Who built the engine?

rev-speed

your boy has ***** lol.....
send him to my shop in fresno next time he s willing to push something that hard

im game when there s something to learn from....

phaphon

i didnt run a block guard
the bov im sure was fine i could hear it pretty good
and the full tune i was on my way to get the tune finish
oh and i built the engine.
and im sure if it was something with the engine build i would have heard it or
notice it cause something else would have happen right? cause other then
it sounding like a subie and driving like it has crack cylinders it had no knocking whatsoever

phaphon

yeah thats what i thought but he just honed it changed pistons and bearings and i do still see the car driving in the fresno area

kyden

did you even measure the crank to see if it was reusable after spinning a bearing?

mechanix619

Just because you can hear the BOV doesn't mean its actually working properly. BOV and WG from eBay have been know to fail. They don't function as well as a Tial or Precision.

I'd think the issues stems from the tune but the eBay parts would also be a red light.

dcmatt

iTrader: (7)

You had mentioned you spun a rod bearing so I figured I would let you know. Since you didn't check bearing clearances I'm going to assume you didn't check piston to wall or ring gaps either so I figured the videos would help.

00Red_SiR

Bearing clearances have to to with your crank and rods, cylinder walls cracking have to do with the tune (or lack of) that you were running.

EFPhilly

Ran lean....cylinder walls got hot and broke. Sounds like its time to get a nice Wg and wideband

turbociv910

lol... cheap ebay parts= blown up engines

phaphon

yeah i plan on building another motor soon since some money should be coming in. And upgrading some parts on my turbo kit.Its funny my tuner told me i didn't need to bother getting another wg.Thanks for all the info and yeah i'm also leaning towards this as a reason is that my car has overheated pretty bad a couple of times when i let the turbo timer stay on.This has happen about three times.The needle was well pass the red line