stock pistons psi

[mo' parts]

Quote:

Originally posted by turbovanman What does the gasket look like between cylinders 2 and 3. Is it dark? if so, thats where it blew. You should still see the crosshatch pattern in the bores, thats a good sign. If you can't, then you have wear.

there is little cross-hatch. but also some scuffing(which was there previously) honestly, it looks like they only ran the hone up and down 2-3 times. though im not a certified mechanic. but my dirt bike hones were WAY better when i did my rebuilds.. give me a couple of days to get the pistons out, then ill know for sure. im working on picts., though they will prob. be in my other thread in the help sect. under blown rings?

but on topic, i want to run about 25 psi max on track, and 15-18 street. im working on 2 stage boost while car is down. so would i be wasting time using the cast again? or splurge and get forged? JE 's? i dont want to rebuild every 5000 miles, though my car is a toy as i have a chuby z71 for back up.

[glhsken]

splurge. Can you run cast, yes. Going to run cast? Make sure everything is 100% right and double checked.

Bryans car is an extreem example, but it doesn't get pounded on daily. More of a "track" star . You run it often on the street, your chances at hurting something increase. Insurance is worth the time and dollars down the road to replace cast pistons.

[mo' parts]

so ill need to order pistons first? if the block was fresh at .020 over, will i still need to have the block machined to the pistons, or can you order the pistons to the size of my existing bore? man, looks like i might miss running it this summer.

whats the best? JE? i heard you can order them singly from FM. what pistons seem to work best, w/ little noise, as ive heard some are quite noisy on start-up.

[glhsken]

You can measure each bore and have them made . I run wiseco (under $400 with rings and pins. The clearances are great .0035 is all they recommend. Tolerances are great.

Why not pop 2 more cast in and run while they are being made. Risk is hurting a cylinder and having the new psitons be worthless. But there is such a thing as PATIENCE lol

[mo' parts]

in waited 3 mos. on shortblock, and another 2 on the turbo, have to find more patience. hopefully have the pistons out tonight. know more then. may just do that and turn it down to 12-15psi. that way i can prep my other block in the mean time. i didnt think i hammered them that hard? wiseco? ive ran them in the dirtbi.kes ect. for years w/ lots of abuse. w/rings under 400? where? sold!! my other block is stock bore.


do the wiseco have larger wrist pins like the JEs? just estimating machine shop prices(machining rods ect.)

thanks again ken

[glhsken]

Pins are .901" I Believe stock is .900" so a hone will do it.

WWW.wiseco.com

Ask for Duane Snyder, Give him my name.

[mo' parts]

Quote:

Originally Posted by glhsken Pins are .901" I Believe stock is .900" so a hone will do it. WWW.wiseco.com Ask for Duane Snyder, Give him my name.

thanks again

pistons are out, #2-#3 are cracked on the underside, rings are fine.. clean, no chunks luckily. broke from ring land on one side to the other. at a weeks worth of 22psi(94 oct.). so back on topic. i would say 15-18psi would be a safe limit for stock pistons. i ran that psi for 1500 miles or so. then i turned it up. ill check out the wiseco when i get back from work. was up till midnite tearin it apart(got a late start, waited on an extra set of hands) :big grin:

[turbovanman]

Bummer breaking 2 pistons, wow. I hope that doesn't happen but if it does, it will be forged next time. Good luck and let us know what you find out for the forged fit! :big grin:

[mo' parts]

well it seems as though both of my blocks must go the machine shop first. i bought a dial bore gauge from jegs today, and they both are out of round, and tapered just beyond the service limits. thats funny, i just bought this shortblock from FM. it had to have been out of limits when they put in the new pistons and rings. there is no way it got that far out of specs from 1500 mi. so i guess ill order pistons and have my block matched to them. gonna go with wiseco forged. the block from FM is already .020 over, could this just be honed to square it up? or am i gonna need a bore? and if so what size to go to? isnt .030 over an oddball size? or is .040 over too far? start shopping for a reputable machine shop i guess, anyone in central ohio that knows of one?

thanks!

[turbovanman]

Hey, no offence but maybe have a good machine shop check your bore. Those dial bore guages can be difficult to read sometimes and you might have a really round bore but you yourself read it as tapered or out of round.
If they are out of round, bummer. Good luck!

[mo' parts]

well the difference in meas. is off quite a bit from top to bottom(tapered), and the side to side(parallel and opposite to crank). so ill have a machine shop check it anyway. cause your right, they are kind of hard to read for a beginner, but ill learn, like ken mentioned earlier, patience!

where do you run in southern oh ken? or have you? just curious. the closest place to me is marion raceway, or pacemakers(only 1/8 mi.). would like to get to track this summer at least a couple times.

[glhsken]

We run at edgewater or tristate. My cars best was a 12.51 @ 111.85. It was POORLY tuned then. I have a complete new set-up (block and Head) ready to go, won't be at the strip again until August. But I do like to go and watch.

YES .030 over is an oddball size. This one is going to take time. Let the machine shop check it out and tell you what size to order. Any help you need, Between Reeves and I we seem to have trouble shot them all.

[glhsken]

LOL.. I have well over 250 passes on my car. It's a toy

[turbovanman]

Quote:

Originally Posted by glhsken We run at edgewater or tristate. My cars best was a 12.51 @ 111.85. It was POORLY tuned then. I have a complete new set-up (block and Head) ready to go, won't be at the strip again until August. But I do like to go and watch. YES .030 over is an oddball size. This one is going to take time. Let the machine shop check it out and tell you what size to order. Any help you need, Between Reeves and I we seem to have trouble shot them all.

Who's Reeves?


Adam, how old is that long block from FM? how many km's on it. If and when the machine shop confirms the bores are bad, if its low miles then I would be making a phone call to head office and letting them know of there poor quality of there rebuilt engines, you never know, you could get something back? :thumbs up

[mo' parts]

Quote:

Originally Posted by turbovanman Who's Reeves? Adam, how old is that long block from FM? how many km's on it. If and when the machine shop confirms the bores are bad, if its low miles then I would be making a phone call to head office and letting them know of there poor quality of there rebuilt engines, you never know, you could get something back? :thumbs up

it was a shortblock, and highly doubtful as all motors are SOLD W/ NO WARRANTY, the shortblock had 1500 miles on it. the timing and boost was my problem though the motor may have needed work before hand. thats a toughfy. cause they were kind of doing me a favor(i thought) by doing a stock shortblock for me for 900$. sh** happens, and sometimes it happens to the best of us. but ill figure it out(money, money, money!!!). anythings worth a try!!!

lmk when you plan on running, ill be interested in checking it out, just for sh*#s and giggles and such. at least this time around ill know whats going on in the shortblock before hand. where before it was just trusting someone else.


yea, whos reeves?