Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

I bought these pistons from a member off of HT for basically for basically dirt cheap in a package deal, there used SRP's. They originally came form the member Spun Vtec but he doesnt seem to remember the compression of them

They are for a D16
They are SPR forged based on the thick ringlands
They have a #10 and SRP logo stamped inside of them

Heres the measurements I took with a digital vernier

http://www.we-todd-did-racing.com/we...MXk1NDE%3D.jpg

Pics a little blurry but the 4 measurements are all there

Heres an overhead pic if it helps

http://www.we-todd-did-racing.com/we...MXk1NDE%3D.jpg

Now any other measurements you guys need I will gladly take as Im doing absolutely nothing this weekend, girlfriend is sick and Im just keeping company while she sleeps I guess. Ive got the used rings they were used with

Im hoping someone can help me identify what pistons they are exactly from SRP's lineup and what compression they will yield in what motors. Im going to be using them in a D16A6 with a .040 milled head, just need a compression number to see if I should sell them or not.

Thanks

Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

whats the deck height and CC of the piston :-*

Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

Am I able to figure those out?

Is deck height the 2" measurement Ive got on the right?

Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

is the piston dished or domed? if its dished or flat top, use it.

Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

well there basically flat, if you look at the overhead pic you can see a ring going the circumference of the piston about 1cm inwards, well the height of the piston drops about 1mm on the inside of that ring

At first Spun said they were 9.5:1

Now I emailed him under another name and he says 10.5:1....

Which with my .040 milled head just isnt going to work

I need to get an accurate compression ratio

I was hoping the ringland hieghts and #10 stamping would be able to determine the exact piston from SRP's site

Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

I have a set of SRP pistons with the number 10 stamped on the inside between the holes for the wrist pins. The top is flat like your pictures above. The serial number for the ones I have is SRP-149199. They are 75.00mm and the dish is 11cc. I was told the compression ratio is 9.00:1. These are for a stock bore D16Z6. I hope this helps.

Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

ya man any info at all helps

Is your serial number on your pistons somewhere, maybe its hidden somewhere I cant see it...? or on a spec sheet, something I wish I had so I can either assemble these to my eagles or buy another set and not get an LSD

Thanks, gonna go enjoy some canadian parking lots sideways

Hopefully SRP will throw me an email

Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

I checked one of the piston, and there is no serial number on it.

Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

ya none on mine either, I dont want to use them if my compression is gonna be like 11:1 and I try and run 18psi on 93 octane

KABOOM!

Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

dude are you ever gonna buy my nitrosu kti you won on ebay? if not i'll have to relist it and pay the 15 dollar ebay fee, which will not come out of my pocket cuz that just isnt cool, this is the 2nd time ive relisted it and now it will be the 3rd.

Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

lol, where did he go? ???
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Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

pm'd you again scott, m/o is MIA but Im trying

bump for late night installs and top speed runs on Steeles

Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

the only way to find out the compression is to check the volume of the dish. even w/ "9:1" pistons .40 off the head is rediculous. I'd say pick up a new, un-milled head and start from there.

Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

.40 is alot to have milled off a head

Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

milling heads is for old people w/ carburators. there are better ways to gain compression then that.

Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

lol its .040 guys, huge difference, about .7 compression will be gained from it

The head was ------- built to the tits, stage 3 port, gasket matching and 5 angle valve job + all upgraded internals a delta 272 cam for $435, wasnt passing that ---- up at ------- all

Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

should've went stage 4 porting

Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

lol, I heard stage 4 is only for 30psi+ and not recommended for the street. A friend of mine had a stage 7 clutch. The cops wouldn't let him drive on the city streets with it. I'm thinking about getting a stage 3 valve cover though. I've heard good things about them.
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Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

oh snaps dog; aint got nothin on my stage elevinty oil cap

Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

when I went to sleep this morning, I realized I had said .40 instead of .040, but I was too drunk and tired to get up and fix what I said. and regardless. milling heads is still for old people w/ carbs.

Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

or people with warped heads.

Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

back to the pistons,they look like stock replacements.

Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

Ya well based off the info Ive gotten from JE tech and some posts I found by the original buyer, they are either the 9:1's or 10.5:1's

He bought them for a boost application D16a6 aswell so Im gonna pray that they are 9:1

BTW- Installing sprial locks >:(, ------- so hard, kinked one last night and stopped trying, need to try it with some oil or something

Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

the high comp d-series pistons should be domed and not dished...you should have low comp pistons there. now the real question is which low comp pistons do you have.
srp makes different ones that all fit d-series, but will yield different comp ratios depending which block/head/gasket you use.
d15--9.0
a6--9.5
a6--8.5
z6--9.0
y7--9.0
y8--9.0
these are all for the applicaple piston in the listed block head gasket combo. i've calculated the z6 9.0 piston in a y7 block, head, gasket combo to come out to 9.4. you should be fine, but you won't know what the exact comp ratio is until you find out which piston it is and run through a comp calculator...don't forget to account for the head milling. you might want to clay/platigauge the pistons to see if the valves hit.

Re:Piston ID Gurus. SOHC SRP's. Pics N Prescision Measurments
 

well the original buyer bought them for an A6 so Im assuming there either the 8.5:1 or the 9.5:1

I was asked to measure the compression height, from the middle of the wrist pin to the top of the piston.... so Ill go do that right now