Now first off take price out of the equation because it doesnt matter. And all this is for an H22

Im having a little dilema(sp?) right now, i cant figure out which pistons i want to run. And i have been considering these two in these specs; Endyn 90mm 12:1 cr(maybe a little more), or IB spec wiseco 88mm 12.5:1cr(maybe a little less). What im concerned about right now is valve-piston clearance. and with whatever i choose i plan to use Jun cams w/ ferrea valvetrain. As for induction i will probably go with some ITB setup.

The question is, is which setup would yield me the best all around power gains? and because the displacement on the 90mm is bumped up, would i need to make more changes to the head to make it flow right? Also what size valves should i or do i need use with either setup?

As of right now the car is my daily driver, but i plan to get into road racing and possibly some auto-x. the car will still see the street every now and then but will be replaced after awhile but another daily driver.

All this is on an A4 block that will be sleeved. thanks for your help in advance yall!

 

this thread won't last long...

 

I have Endyn 89mm 11.89:1 Rollerwaves and Crower Stage 3 cams, stock valves and JUN Valvetrain. No clearance problems, the Endyn's have deep valve reliefs. I can't speak for the IB Spec, but they are both made by Wiseco...so the reality of the matter is they are both good pistons.



Pretty sure 90mm rollerwaves would require head modification as they bring the dome all the way out to the edge of the piston.

 

I have the 88mm 12.5:1 IBSpec Wiseco pistons.... I may be able to snap some pictures for you so you can see the piston dome and the valve reliefs. And, if you're interested, I'm selling my longblock as well... Or, if you just want the shortblock, that can be arranged to... H22A block, RS Machines Sleeves, 88mm IBSpec Wiseco 12.5:1 custom pistons, IBSpec Probe Ultralite Rods, custom crank work, Balanced/blueprinted, etc, all new seals, bearings, thrusts, etc... Prodrive Billet Oil Pump gear, new oil and water pumps, etc... All brand new, zero miles... Check my sig if you're interested...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LudeTuner &raquo;</TD></TR><TR><TD CLASS="quote"> What im concerned about right now is valve-piston clearance. and with whatever i choose i plan to use Jun cams w/ ferrea valvetrain. As for induction i will probably go with some ITB setup.
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piston to have clearance depends upon several things that you have not made clear.

we need to know if you are going to run different length rods, if your head is going to be shaved or if you are going to run an aftermarket head gasket (thicker or thinner)

even still if we know that stuff, you are going to need to check piston to valve clearances once everything is installed.

why go with itb's?
unless you are going to custom fab some. you might be better off running a ported oem intake manifold or get someone to make you a custom one.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LudeTuner &raquo;</TD></TR><TR><TD CLASS="quote">
The question is, is which setup would yield me the best all around power gains? and because the displacement on the 90mm is bumped up, would i need to make more changes to the head to make it flow right? Also what size valves should i or do i need use with either setup?
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both pistons will be good. wiseco is thought of as some of hte best stuff out there.
in terms of what will make more ultimate power, they will both be really close. maybe 5-10whp difference after everything has been fully tuned and you are broke from spending soo much money

if you really want to make big power, you will still need to get a head that flows good and is done by someone with alot of porting experience.

stock valves are fine. why are you even going aftermarket?
aftermarket vavles do flow more air, but the benefits usually doesnt out weigh the cost difference

as far as 88mm vs 90mm. I dont know enough about the two options. with everything being equal bigger displacement always makes more power

I dont know if there is a downside or upside to running 90mm vs 88mm

btw, who is gona build your motor?
the person that can give you the best answers is your engine builder. tell him you have XXXX.00 amount to spend and want a given amount of hp.

you might want to read this
basic Piston Tech article
to learn a few more things on what makes a good piston vs a average piston

 

Not this again.

 

&lt;---fetal position

 

so far its not a problem...just keep the information just that ...information. no voting...if you have nothing good to add....don't reply.