forged pistons...

[liamrh]

So I was hoping someone had all the dimensions for the deck & land etc for stock pistons. I remember those neato (cad?) drawings back on TSN that had all the specs. Anyone have them still? Also, since I am preparing to order them, besides the scat rod/pin thing, how do I go about specifying that I want this ring land thicker etc in relation to the stock specs? Thanks for the suggestions.

[SupraCharged007]

why do you need all the specs? You can order pistons in all kinds of compression ratios and styles that have already been drawn up. What specifically are you looking to do?

[liamrh]

Since I know nothing about ordering forged pistons I assumed that wrist pin diameter, top ring land thickness , etc. would need to be provided for them to produce the proper piston. Maybe they already have the information but I just haven't queried them on it. Looking for 8.5 CR pistons that have oil drain back holes and a larger top land but still retain a good quench. Please, let's hear it if you have ordered pistons already.

What brought this on....
http://www.jepistons.com/pdf/custompist ... erform.pdf

[Brandon94sc2]

CP's have been proven to be great. The thickest ring land i remember are the pistons that Mike (Boostedsl2) has Ross make for him. If you PM him i think it still has all the specs.

[liamrh]

Werd, let's see what we can get out of this for the information on s-series pistons and exact specifications etc. that are applicable.

[SupraCharged007]

I have the specs from Mikes pistons .... but its not very easy to read cause I scavenged it from a text file of TSN's database.

And most forged pistons are going to have the .787 pin. If you have the SCAT rods, tell them you need a .767 pin. Easiest way to do it it just call up SaturnMotorsports. You are going to pay a lil more but the CP's have proven to be great. Maybe call up JE and ask them. I don't know anyone who stocks those though. SPS might still have some info for them.

[onemeansaturn]

I've got the specs too, but alas... Mine are hard to read as well.

Joe

[S.Bretz]

I had a set of JE's that had a top ring about .1 thinner then Mike's. I got them from SPS years back and had them tell JE that nitrous WAS going to be run on the engine, so make whatever adjustments they need to. The dome wasn't as nice as my CP's, but they sure did wear a heck of alot better in the cycliners/bores.

[liamrh]

I had a set of JE's that had a top ring about .1 thinner then Mike's. I got them from SPS years back and had them tell JE that nitrous WAS going to be run on the engine, so make whatever adjustments they need to. The dome wasn't as nice as my CP's, but they sure did wear a heck of alot better in the cycliners/bores.

So the JE's held up better overall vs. the CP's? Anyone run wiseco pistons? What else have people tried. POst up the specs as best as you can arrange them and I am sure that we can get it filled out.

[liamrh]

Christ you guys, is it really that hard? Someone, and lots of you, have this info. Post it up so we can retain it for public knowledge.

[SupraCharged007]

lol here you go


bore size - 3.248 net dia 3.243\r\ncam - j\r\nC.H. 1.183\r\nring grooves 1.5 1.5 3.0mm\r\nring groove roots 2.965 2.965 2.933\r\nring lands .3 .175 .085\r\npin dia .787 pin length 2.350\r\nlox type WIR\r\nnet dome cc''s -14.000\r\ndome height 0\r\ndish depth 0.160\r\nint v.p. depth 0.090\r\nexh v.p. depth 0.090\r\npiston weight 288 grams\r\n\r\npins supplied under ross p/n 787-18-23c\r\n\r\npiston thickness data-\r\n\r\n2.920 a dimension (ross engineering only)\r\n.424 deck thickness major front\r\n.424 deck thickness major rear\r\n.415 min. thicknes under intake valve pocket\r\n.415 min. thickness under exhaust valve pocket\r\n.200 min thickness at top of dish\r\n.200 min thickness dome at edge on plug side\r\n.272 intake valve pocket to top ring groove\r\n.272exhaust valve pocket to top ring groove\r\nlox to oil ring groove - n/a they''re WIR\r\n.131 skirt\r\n.092 side relief\r\nspark plug notch -n/a\r\nspark plug slot - n/a\r\n291 w demension (ross engineering only)\r\n.076 pin hole to side of pin boss\r\n.625 pin engagement in pin bosses (each side)\r\n\r\n\r\nthe following is the lazer mike size report\r\neach piston measured or "sampled" on ross lazer mike in\r\n3 places on skirt...ignore the first two columns on report\r\nas they pertain to lazer mike recording system only (library 1)\r\nsample 1 is the net skirt dia at position 1 - immediately below\r\nthe oil ring groove\r\nsample 2 is the net skirt dia. at 2 - .400 above position 3\r\nsample 3 is the net skirt dia at position 3 (very bottom of skirt)\r\n\r\na piston position one net dia 3.2388\r\na " " two net dia 3.2429\r\na " " three net dia 3.2429\r\nb piston position " 3.2388\r\nb " " " 3.2428\r\nb " " " 3.2428\r\nc piston position " 3.2388\r\nc " " " 3.2428\r\nc " " " 3.2428\r\nd piston position " 3.2388\r\nd " " " 3.2429\r\nd " " " 3.2429\r\n\r\nWIRE LOX PIN DIA .787 - .791\r\n\r\nin case you wanted to know about the rings\r\n\r\ntop rings - molybdenum faced, barrel lapped,\r\nductile spheroidal graphite iron, phosphate coated,\r\nor gas nitrite steel barrel faced\r\n\r\nsecond rings - grey gast iron, reverse torsional\r\ntwist, taper faced, zinc phosphate coated, or napier\r\noil rings - stainless expander, circumferential type\r\nchromium plated rails, low radil depth.');

[SupraCharged007]

thats the specs for Mike's old Ross pistons, JW has the job number i think

[d3ad1ysp0rk]

Formatted:

re size - 3.248 net dia 3.243
cam - j
C.H. 1.183
ring grooves 1.5 1.5 3.0mm
ring groove roots 2.965 2.965 2.933
ring lands .3 .175 .085
pin dia .787 pin length 2.350
lox type WIR
net dome cc''s -14.000
dome height 0
dish depth 0.160
int v.p. depth 0.090
exh v.p. depth 0.090
piston weight 288 grams

pins supplied under ross p/n 787-18-23c

piston thickness data-

2.920 a dimension (ross engineering only)
.424 deck thickness major front
.424 deck thickness major rear
.415 min. thicknes under intake valve pocket
.415 min. thickness under exhaust valve pocket
.200 min thickness at top of dish
.200 min thickness dome at edge on plug side
.272 intake valve pocket to top ring groove
.272exhaust valve pocket to top ring groove
lox to oil ring groove - n/a they''re WIR
.131 skirt
.092 side relief
spark plug notch -n/a
spark plug slot - n/a
291 w demension (ross engineering only)
.076 pin hole to side of pin boss
.625 pin engagement in pin bosses (each side)


the following is the lazer mike size report
each piston measured or "sampled" on ross lazer mike in
3 places on skirt...ignore the first two columns on report
as they pertain to lazer mike recording system only (library 1)
sample 1 is the net skirt dia at position 1 - immediately below
the oil ring groove
sample 2 is the net skirt dia. at 2 - .400 above position 3
sample 3 is the net skirt dia at position 3 (very bottom of skirt)

a piston position one net dia 3.2388
a " " two net dia 3.2429
a " " three net dia 3.2429
b piston position " 3.2388
b " " " 3.2428
b " " " 3.2428
c piston position " 3.2388
c " " " 3.2428
c " " " 3.2428
d piston position " 3.2388
d " " " 3.2429
d " " " 3.2429

WIRE LOX PIN DIA .787 - .791

in case you wanted to know about the rings

top rings - molybdenum faced, barrel lapped,
ductile spheroidal graphite iron, phosphate coated,
or gas nitrite steel barrel faced

second rings - grey gast iron, reverse torsional
twist, taper faced, zinc phosphate coated, or napier
oil rings - stainless expander, circumferential type
chromium plated rails, low radil depth.

[boostedsl2]

all of that crap is filed away in my taxes from about two years ago. thats why i never give it out.

there are a bunch of different jobber numbers for those pistons because they came in different bore sizes. call ross tell them what you want to do and most likely, they'll do their job and give you the right jobber number.

not to mention, it took me a lot of time and money to get those specs. i wanted it bad, so i did the research myself.

they are going to be way more expensive then any other piston. the reasoning is because the top ring land is so thick that it pushes the pin boss into the oil control ring.

because of this, you have to run a oil support ring which is an additional $80 or somthing like that.

if you get jobber pricing and order 3 sets, you might be able to get them for about $580. if you pay for one set and full retail, you'll be more twords $700.

[liamrh]

Formatted:

SHENS

Good work on that! I was going to do it when I got to to work but BAMO, you did it already.