what kind of piston rings and wrist pins are you using? and aftermarket rods like eagle fit onto the without modifications?

 

Most of the time when you buy Vitara pistons they come with Hastings rings. So, that's what most people use...

The Vitara pistons come with floating wrist pins that fit aftermarket rods like Eagles without modification. They just slide right in.

 

i also read that d16 civic pistons are 95mm or something...and vitaras are 94.9mm...does that make much of a difference?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sohc ninja &raquo;</TD></TR><TR><TD CLASS="quote">i also read that d16 civic pistons are 95mm or something...and vitaras are 94.9mm...does that make much of a difference?</TD></TR></TABLE>

Uh, no. D16 pistons are 75mm.

 

oh...lol i was 20mm off...i ment d16 pistons are 75mm in size and i heard vitara pistons were 74.8 or .9 mm...does it make much of a difference?

 

I got a b series so no personal experience but I've read that they make a lot of noise till they warm up and expand cause they do fit a little loose in the cylinder.

 

Vitaras slap a lot, no big deal I guess.

 

so is slap good or not? and how can you get piston slap? does one millimeter really matter inside the combustion chamber?

 

no, slap is not good. But for a lot of applications it really doesn't produce enough wear so that it's a serious problem. The sleeves might start to get weak after like 100K but for all intensive purposes it's just an annoying noise. From what I have heard and experienced (motor has 11K on it) the vitaras piston slap isn't a performance issue, so far.

 

i still dont see the benefit of these pistons really . they lower compression quite a bit. slap isnt a big deal my cp's slap a tiny bit when cold....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hella_JDM &raquo;</TD></TR><TR><TD CLASS="quote">i still dont see the benefit of these pistons really . they lower compression quite a bit. slap isnt a big deal my cp's slap a tiny bit when cold....</TD></TR></TABLE>

Budget minded alternative to forged pistons. They are a stronger casting process of AL, have beefier ringlands and lower the compression for a lil margain of safety.

All those pluses... for under 150shipped... with rings.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hella_JDM &raquo;</TD></TR><TR><TD CLASS="quote">i still dont see the benefit of these pistons really . they lower compression quite a bit. slap isnt a big deal my cp's slap a tiny bit when cold....</TD></TR></TABLE>

They're cheap, low compression is nice when in a beginner setup where you need a nice margin of safety. They're not for everyone but motors like the 4g63 run cast low compression pistons and make 500hp on stock motors so, this isn't new, and it definitely works.

 

yeah i was thinking, vitara pistons into my d16z6 with eagle rods...i've seen similar setups and im just looking for around 250hp with a 14b turbo setup with 2.5" exhaust. see drag racing is not my thing...i like road but everybody needs power once in a while right? what does piston slap sound anyways?? i've never heard it before.

 

All your questions have been answered in lots of other threads je je je

I use what i sell! I am using the exact setup i sell..Vitaras with Hasting rings.The pistons comes with the wrist pins and they fit on Eagle rods perfectly.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">i still dont see the benefit of these pistons really</TD></TR></TABLE>
Well the benefit is being able to have a much nicier and stonger piston than OEM..Being able to have something that will reliably hold power and boost at the fraction of what aftermarket pistons cost..

Compare $125-135 a set of these vs 350+ for a set of aftermarkets...which i've seen them(CP's) blow with less than 15 PSIs of boost..

 

u think i can buy a set of vitara pistons when i can get the money? im taking engine building class so i'm going to get them before june next year.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sohc ninja &raquo;</TD></TR><TR><TD CLASS="quote">u think i can buy a set of vitara pistons when i can get the money? im taking engine building class so i'm going to get them before june next year.</TD></TR></TABLE>

Just PM FJT, he'll take care of you.


I'll let you know if 250 is doable on the vitaras and the 14b on a z6. I'm in the process of aiming for that with one... we'll see if the turbo breathes long enough (i also dropped in a set of flat top valves though... so i'll sneak a little more compression back.. i might have dyno pre-valves though... just depends on my funds).

 

i'll be dyno-ing the same day as my man splitime, and i'll be running my vitara piston/eagle rod bottom end by then, as long as the build finishes up nicely.

i'm shooting for 300 whp, but i'd be happy with 250.

my car is making around 200 whp now, stock d16a6. made 185/155 at 6.5 psi, and its at 8-9 psi now.

hopefully we can make some good numbers for vitara pistons that day.........i'm REALLY anxious.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by redzcstandardhatch &raquo;</TD></TR><TR><TD CLASS="quote">i'll be dyno-ing the same day as my man splitime, and i'll be running my vitara piston/eagle rod bottom end by then, as long as the build finishes up nicely.

i'm shooting for 300 whp, but i'd be happy with 250.

my car is making around 200 whp now, stock d16a6. made 185/155 at 6.5 psi, and its at 8-9 psi now.

hopefully we can make some good numbers for vitara pistons that day.........i'm REALLY anxious. </TD></TR></TABLE>

what engine management are you using for your a6? pretty good numbers for 6.5psi

 

turboedit, dsm 450's, walbro 255, and a b&m regulator.

will be running a motorola 2.5 bar map with engine build.

 

FJT made 266whp IIRC, and that was all stock (besides pistons/rods) on a d16y7. It depends on the motor, but they really don't reduce the compression as much as people think. BTW, on a d16 you'll see less than 5hp decrease before spoolup when you lower the compression ~1 point. I think that's worth the safety margin you gain.

FWIW, there are a few 230-250 whp d16's with all stock components still holding, excellent tune was a key factor of course. I'm shooting for around 300hp after I do some tuning with a z6 & zex cam running a s-trim t3/t04b (essentially an oversized super60 t3). I plan on running 3 boost levels, stock actuator's 7lbs (using GM solenoids to bypass turboxs hpds), 12-15lbs on stage1 of turboxs, and 15-20psi on stage2 if I ever need it (after tuning).


btw I just measured a piston, from just below the oil ring (above the largest part of the skirt) I get 74.87mm with my digital caliper.


Modified by HiProfile at 11:39 AM 9/23/2005

 

250 on a 14b will be a piece of cake man. Just requires some boost, but low compression motors like boost..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fjt &raquo;</TD></TR><TR><TD CLASS="quote">
Compare $125-135 a set of these vs 350+ for a set of aftermarkets...which i've seen them(CP's) blow with less than 15 PSIs of boost..</TD></TR></TABLE>

cp's are 500 i have them . and if youve seen them blow at 15 lbs its because something happend ie. improper tuning , bad gas , detonation , fuel or ignition malfunction etc....

cp's are argued to be the best piston on the market so you cant really compare the value of vitaras to cp's blowing at 15 lbs...

 

agreed. but you also cant compare the $126 shipped i got the vitaras for (i think) to 500 bucks. (obviously)

i WANT cp's...but it just doesnt make sense for my situation.

i'll be able to achieve more than the HP goals i have with the vitaras...so they are my choice....and, cast pistons are easy on the cylinder walls.

man, i want CPs.......oh well!.

 

forged pistons are no more harder on cylinder walls than cast , its the size of the piston and the amount of slap which if anything , would hurt an engine , my cps slap like ****** hell when cold , but warm up nice and toasty they are fine.

 

stock z6's are loud when they are cold also arn't they?