Im getting some wiesco pistons with some rings. im not sure on what the spacing or gap they should be at. there 8.5.1 turbo pistons. im not putting this thing together but the machine shop is. i just want to give them some specs to follow so this gets done right. can someone give me some info on this.

also em i usen the rught terminology? Gap??

 

turbo / na ??

 

8.5.1??? NA..hahah jk. turbpo. it listed above.

also i see they come in diff. thickness. im not sure what i need. planning to run about 12psi on high boost.

 

http://store.summitracing.com/...w=sku

 

wiesco pistons should have their own formula for determining ring gap.. but for 87mm pistons (stock bore size) i use .17 - .19 top ring / .20 - .24 botttom ring gap for turbo charged motors

i think i have to recheck my numbers when i get home to my garage. but im pretty sure thats what i use

 

will these work fine for this build?

http://cgi.ebay.com/ebaymotors...ZWD1V

 

those are just rod bearings... your gonna need new main bearings too.. ACL's are good bearings.. i use them in the motors i build and my personal motor as well..

you should hit up earl laskey on honda tech name is earl, he can sell you a complete set of bearings

 

okay. thanks for the reply. im usen 88mm bored. what u think the gap should be be on that??

how are these for gearings. i can get the set of rod/main for about 100 bux. good deal right?


http://cgi.ebay.com/ebaymotors...wItem

 

theres a formula, for bigger sized pistons to determine ring gap.. i have that at home.. ill look it up for you.. you really should just buy main and rod bearings from earl.. look him up.. its the same price.. if not cheaper.. and hes not some unknown ebay seller.. hes well known on here plus.. he will send you the right bearings the first time around

 

okay..if he gives me the same deal then ill get them from him. that would be awsome if u would forward me the chart.

why does ring gap play a big role on motor life?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DrivinVtec &raquo;</TD></TR><TR><TD CLASS="quote">okay..if he gives me the same deal then ill get them from him. that would be awsome if u would forward me the chart.

why does ring gap play a big role on motor life?</TD></TR></TABLE>

because heat causes metal to expand, and you need proper clearances to compensate for that..

 

thats what i thought. i just wanted to make sure i was thinking right.

 

u think 740 injectors would be okay for 12-14psi of boost?? t3/t4 60 trim

 

i dont know anyone who makes 740cc injectors.. how much power are you looking ot make? psi number is irrelevant

 

I would suggest getting higher comp pistons if its a DD..8:5:1 is gonna be sucky on the street while just driving.
what about 9:5:1? make more power as well..

 

i ment to say 750 rc. looking to make maybe 300. maybe a bit more, but not to much more. max 350

 

i drive 9:1 on the street daily driven.. i doubt .5 of a CR would make the drive that much sucky'er

 

you will be fine with 750s

 

750cc is fine for 300whp

 

i can get some eagle rods an pistons for 360 shipped. cant pass it up. i make full boost now at 3700. i think it wount be maybe 4200 rpm until i hit full boost with the CR

 

what about 350?

 

compression ratio has nothing to do with spool up time of the turbo

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DrivinVtec &raquo;</TD></TR><TR><TD CLASS="quote">what about 350?</TD></TR></TABLE>

350whp can be obtained with 750cc..

 

what??? oh no. im sorry but i cant agree with that. high compression with increase spool time.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mykizism &raquo;</TD></TR><TR><TD CLASS="quote">compression ratio has nothing to do with spool up time of the turbo

350whp can be obtained with 750cc.. </TD></TR></TABLE>

So having a higher compression piston that makes a more powerful explosion causeing exhaust gases to expel out to the exhaust manifold at higher rate than a lower CR piston wouldnt cause faster spool up?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by roller3804 &raquo;</TD></TR><TR><TD CLASS="quote">

So having a higher compression piston that makes a more powerful explosion causeing exhaust gases to expel out to the exhaust manifold at higher rate than a lower CR piston wouldnt cause faster spool up? </TD></TR></TABLE>