JDMmadness

so i have been in the process of turboing my b16a2, all i have left is to pout the downpipe on. but when i was putting my freshly tapped oil pan i looked up at my internals and found that i have eagle rods and srp pistons. Shocked and pumped but now that i have been looking into it ,my main concern is i have no idea what the comp ratio is. Any ideas to what i should do to tell?

im worried they are 11-1, which wouldnt that be dangerous to run?

and i have already put the new pan on and i dont want to take it back off if there isnt a part number on the piston. if they were purchased before 04 there wouldnt be one, i read on srp's website

so im stuck in a rock in a hard place

any ideas to how much power i could run if they are 11-1, or would the psi be noticeably higher if i do a compression test? And does any one know if the srp b18c5 pistons are domed or not?

Need answers thanks

JDMmadness

http://www.jepistons.com/Catalogs/SR...6a1-a2-a3.aspx

that link is for the b16 pistons do you think the picture in the corner is accurate?

i would think the type r ones would look like that,

here is the link to the type r

http://www.jepistons.com/Catalogs/SR...ura/b18c5.aspx

you think i could tell by looking through the spark plug tube?

Nailclipper

well, in terms of cr, ya its high, but it totally doable. my tuner has a h series in the 12 range making 550whp, but thats race gas. still though, i would think with good engine management and that ever important tune you could def run reliably. for your other questions, I'm at a loss. gl.

JDMmadness

im want it to be on pump gas and i have hondata s200

JDMmadness

Up

4cylfiend

iTrader: (1)

11.0:1 turbo on pump gas? Idk about that. Sounds like you are askin for problems unless you run e85 at least..

JDMmadness

I will be driving the car pretty often and e85 isn't around me everywhere,

If it turns out I do have 11-1 would a thick head gasket drop my comp into a safer range?

If so what size head gasket would do that?

4cylfiend

iTrader: (1)

Ya go with the thickest cometic headgasket that you get. Downside to that is if those pistons are not high compression..

Turbo-LS

iTrader: (4)

DO NOT run a thick cometic headgasket, you can boost 11:1 compression on 93 pump gas just need a good tuner. it will be responsive as **** and make great power on low boost but the pump gas is going to be limited as the higher compression brings you closer to the knock threshold but its completely doable with a good tuner

Dioxine

I agree. I probably wouldnt tune it yourself. It will need to be tuned by a pro. Just be carefull and make sure you dont detonate if you ever have to buy less then reputable gas from a 3rd rate gas station. And this is assuming you can get 93 octane. Sadly around here i can only get 91 from the pump

rich7777

In my opinion its better to do something about now than later. You need to pin point exactly what pistons they are so you can work out what to do next. If you find out they are 11:1 then i'd just get them machined to a more "safe" compression ratio... Its no big deal.

JDMmadness

That's what I thought , what kind of power am I looking at? I was hopeing for something in the 300 and I'm going to get it tuned at a place called balanced performance there is a guy there who I hear is good.


What pound wastegate spring should I buy, as of right now i have 1 bar , in using a tial 38mm

4cylfiend

iTrader: (1)

You would definitely need a great tuner. Im not saying its not possible, but leaving it at that high of a CR on pump (assuming 93oct) is a pretty good risk you are taking. Especially when you could knock the compression down a tad with something as simple as a headgasket.

Btw- It was surprising to you that it had aftermarkey internals right? It would be more surprising if the head has been milled down and the block has been decked. That will significantly increase the compression adding to the already "higher than I would recommend" compression you plan on running on pump gas.

If you dont mind taking a chance and have stacks on deck, then go for it! High compression turbo cars are pretty gnarly because of the low-end power they produce.

My .02 cents: A $100 headgasket could save a $1000+ engine.

cleansi

have you done a compression check yet??????


it can easly be boosted with e85

4cylfiend

iTrader: (1)

It would be fine on e85 but its not always available to the OP.

m3tech95

thats a nice surprise....lets say u take off the head and find out you have 10:1 compression pistons...u could achieve more power by knowing whats in your block... if not, lets say u tune to 400whp....it would make me sick to find out later that i had a 700hp setup in my motor and never pushed it further..

sc34dc4

iTrader: (1)

How do you know they are SRP pistons from looking at the bottom of them? Where did you get the block from? 1st thing I'd do is ask that person.

JDMmadness

I looked from the bottom to see that they are srp. This weekend I'm going to pull the pan back off to try and find the engraved part number on them.

I have done a compression test in the past but I don't remember the numbers.

There is a long list of people who had the motor, who had no clue that there are internals in it so there is no way I can find the orginal person.

Does anyone have a ballpark idea what the compression would be around if they are 11-1?

blackeg

ballpark maybe 225-250psi per cylinder?

my current 10:1 motor is 220psi and my old 11.5:1 all motor setup was 245 but the cams had some overlap on them

JDMmadness

so if my compression is lower than 225 i should be in the green

AlexDphoto

11:1 should be no issue to boost. Just make sure youve got a good tuner.

What do the top of the pistons look like? are they flat or domed?

LightningTeg

Why dont you just do a damn compression test. You wont have to take off your pan and you'll know exactly what your dealing with

JDMmadness

haven't tried to look at the top of them, ill do that this weekend along with the comp test now that i know the ballpark of where it would be if they were 11-1

Turbo-LS

iTrader: (4)

300whp is no problem on that motor and will come pretty easily 8-10 psi maybe 12-13 depending on turbo being used

met

I know a guy that has been boosting his stock s2000 for a few years now. Its all stock with a 5857 turbo making 505hp on pump gas with alcohol water injection. Before the alcohol injection he was at about 400hp with regular pump gas. I guess my point is if memory serves me right s2000's are about 11:1. I completely agree with these people saying to get a good tuner and you will be fine. I am down in Jacksonville Florida and Mase is the tuner, he tuned mine too but i'm at 9.5cr.