Can some one help me out. I was just wondering if someone can tell me are high compression good for N/A setup??? What type of compression point will i be rasing??? Anyone can help out.

 

what he is talking about..............

stock valves have a dish in the head, some aftermarket valves don't. They are heavier but transfer heat better. They might raise compression .1-.2 at the most.

They are NOT worth it for just raising compression.

 

So flat top valves like the skunk2 ones are heavier than the other skunk2 valves that have a dimple??? Can someone back that statement up. That flat top valves are heavier than ones that have a dimple! But I am trying to build a N/A setup(full rebuild). Every compression points make a difference, wouldn't you think?

 

The Valves ..I think would be a little heavy...you would want to upgrade the springs at the same time.... but there are better was of to raise your C/R ..

 

my whole valvetrain is being upgrade...skunk2 valve spring, itr retainers, 00-01 ITR Cams, skunk2 valves. But 'mista bone' right that my compression will only be bumped on .01 to .02???

If any is wondering why i had went with the ITR retaniers is because i am running only ITR cams for now. If i want to upgrade later with bigger cams i'll change the retainers to TI later.

 

Mista Bone is right..
BTW, I don't see the relationship between ITR retainers and ITR cams. Valves will float with any cam if you are runnin hi rpms. Run the lightest and strongest retainer you can and the same with the valves if you are building a high performance engine and u want it to live.

 

from what i've heard they are heavier if only just a bit, but every gram helps, if your doing a full build i'm goning to assume that also means pistons. why would you need any more compression? i have the skunk 2 valves/ springs/ retainers/ cams, i went with the dished valve because i don't want that extra .2 pt.

 

Hey dude, if you want to bump up your compression, when they take off your head, drop a spoon head gasket from http://www.jdmhondaparts.com then do all of the other work. It's not much but the gasket shortens the gap between the pistons and the head causing more compression. The only true way is go ahead and change out rods and pistons too. Aftermarket vavles are not heavier than stock, their actually lighter, and the ITR retainers are titanium which is a lot lighter than most stock retainers. The cams are good but if your running vtec cams I'd suggest Toda Spec B's with toda springs and ferrea valves and retainers. But that's just me. (If you put cams in put skunk 2 or toda cam gears for adjustment during tuning)

 

I have a spoon head gasket coming already. I have my rod just shotpeened and i have CTR pistons. So i thought if i got some flat tops that i could gain that much more compression. They say you could get 8% whp for everycompression point. So i can get maybe i can gain 2 comp. points.

For the cams...i need something a little more streetable...i don't drive hard very much...also, money is an issue too...TODA, SKUNK2, JUN, and CROWER=MONEY.

 

Flat top valves have more material (mass), therefore increasing compression. It'll depend on the material if its lighter than stock or not.

Also i would like to add.. on the 00-01' ITR, the Exhaust valves are actually heavier than the larger diameter Intake valves. Same stem, but the Intake valves are thin and have material removed.

 

stick with the stock valves,high comp. valves might raise your compression just barely(i've heard) but most of them are titanium, or somthing stronger than stock.Depending on what cams and pistons you are running, if you miss shift and they touch you could mess up your whole motor with high compression valves cause they are so strong.....now would you rather replace a valve or two, or your pistons??

 

I don't know of many people who put valves through a piston when they have a motor rebuilt unless it was rebuilt wrong. The stronger the vavle, the less chance of damaging during hard use.