Dished piston 9.5:1 is what you prob want. Research it man theres alot of good books out there

 

9.5 would be the best bet. Endyn sells them, but they were back ordered last time i checked.
Otherwise go with 10:1. This advise is of course given under the assumption that you are building the block.

High compression high boost is the way to go.

 

9 to 1 is good too

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by connvict &raquo;</TD></TR><TR><TD CLASS="quote">High compression high boost is the way to go.</TD></TR></TABLE>

I thought having high comp and running boost at the same time aren't good bed fellows.

 

i have arias 8.4:1 and still made 240 at 7lbs ...comming soon 15-20lbs

 

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

I thought having high comp and running boost at the same time aren't good bed fellows.</TD></TR></TABLE>

High compression just makes it more prone to detonation. Tuning is much easier with low compression.

 

i run 10.1. When we tuned it made 503 hp @17.5 psi

Lower compression will feel a little more sluggish of boost but not that much

 

how much boost would be allowable on 11.6:1? or definitely a bad idea?

 

https://honda-tech.com/zerothread?id=1027496

 

Haveing lower compression pistons allow more room for error, but it's a slug on the low end.

Driving my friends 1g TSI (7.8:1 comp or something close to that) below about 3k it feels like a slug.

If you got a good tuner who knows what he is doing go for higher ones, but if you want to be safe go for the 9:1's

 

9 to 1 you will get more power on pump gas

 

What if you sleeve the block and still run the stock pistons (11.1) You wounld be ok right? Because my motor put down 180hp 160 tq to the wheels stock. Plus i have a small turbo 56ar 53 think? forgot lol Or should i got with just lower comp pistons? Trying to save a buck

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by posjr &raquo;</TD></TR><TR><TD CLASS="quote">What if you sleeve the block and still run the stock pistons (11.1) You wounld be ok right? Because my motor put down 180hp 160 tq to the wheels stock. Plus i have a small turbo 56ar 53 think? forgot lol Or should i got with just lower comp pistons? Trying to save a buck </TD></TR></TABLE>
The ringlands are the weakpoint.So get some forged pistons with the sleeves.

 

Don't forget, if you're going to be getting forged pistons, you need to sleeve that bad boy.

9.5:1 works very well with boost if you've worked on the lower end. My advise also, is not to get a head gasket that lowers or highers your CR. Leave the gasket alone.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by matix &raquo;</TD></TR><TR><TD CLASS="quote">
The ringlands are the weakpoint.So get some forged pistons with the sleeves.</TD></TR></TABLE>

Thats all i need to know. Because i was reading it up about you loss low end which i really dont want. So i'm thinking now get some forged 10.1,

 

I'd go with 9:1 if you plane on boosting over 10 psi

 

10:1 might be a tad high. no?

 

9:1 is the best, if not lower. but i suppose for you pussies that are too scared to run over 15lbs of boost then 9.5:1 would be good for you.

why spend all that money on builing a motor and not see what it can do.........i think i'm gonna hit the dyno and try to free spool my 60 trim hehe jk

 

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

Thats all i need to know. Because i was reading it up about you loss low end which i really dont want. So i'm thinking now get some forged 10.1, </TD></TR></TABLE>

When I build up my bottom end, I'm going for 9.5:1 pistons & some good engine tuning. With that 9.5 I'll be able to add a few more lbs of boost.
You'll be fine with 10:1 forged, just as long as you get some good tuning done. Not to mention, it may require you to use higher octane fuel if you are boosting with high compression.

*Edit: Actually, how many psi are you going for? I didn't even know. I'm assuming 6-8 psi territory? How much boost you want to push will make a difference. That's one of the first things I would consider in determining which pistons to get.*

 

I'm boosting 10 right now. Didnt last to long. See i'm trying to work it out so i dont loss low end. And have really good high end. My goal is more like 350hp. My goal isnt 500+ ( 9.1 with 20lbs of boost.) over kill for me.Mybe later.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bstlude &raquo;</TD></TR><TR><TD CLASS="quote">i run 10.1. When we tuned it made 503 hp @17.5 psi
Lower compression will feel a little more sluggish of boost but not that much</TD></TR></TABLE>

If all goes good 10.1comp@ 10psi 350hp..I hope

 

if you install any aftermarket piston on any H series block you have sleeve it if you did'nt already know. But Mahle pistons is now selling a piston for the H series that will allow you to run them with out sleeving. the volume sizesare -1cc, -7cc, 10cc with bore sizes from 87mm to 87.25 check it out a http://www.mahlemotorsports.com

 

That isn't true. I have aftermarket pistons on my H22 and it was never sleeved. Just honed.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jnet &raquo;</TD></TR><TR><TD CLASS="quote">That isn't true. I have aftermarket pistons on my H22 and it was never sleeved. Just honed.</TD></TR></TABLE>

What aftter market pistons you have?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jnet &raquo;</TD></TR><TR><TD CLASS="quote">That isn't true. I have aftermarket pistons on my H22 and it was never sleeved. Just honed.</TD></TR></TABLE>

Are the forged?

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