Just trying to get an idea (Without having them in hand) What the valve relief of a CTR piston is like compared to a USDM ITR. I know the there is a larger dome but is the valve relief area the same.

If Yes, It is safe to assume if there is clearance with a USDM ITR piston there would be the same with the CTR????????


FYI: I will be claying the motor when I get the pistons, just trying to get a heads up

Thanks Mattj

 

Anyone ever use CTR pistons?

 

How about some info such as:

What block?
What head?
What cams?
What crank?
Etc...

This will get us a little closer to an answer.

 

[QUOTE=EKhatch]How about some info such as:

What block?
What head?
What cams?
What crank?
Etc...

If the Block, head, cams, crank, ECT are all the same on both motors they are not needed info to get an answer to my question. Is the Valve pocket or Valve relief area the same on an ITR and CTR piston?

Mattj

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dropspeed &raquo;</TD></TR><TR><TD CLASS="quote">[QUOTE=EKhatch]How about some info such as:

What block?
What head?
What cams?
What crank?
Etc...

If the Block, head, cams, crank, ECT are all the same on both motors they are not needed info to get an answer to my question. Is the Valve pocket or Valve relief area the same on an ITR and CTR piston?

Mattj</TD></TR></TABLE>

Well obviously they are different depths due to the higher dome. The diameter of the cut for the relief will be the same because all OEM B-series vtec valves are the same diameter. If you didn't already know the compression height (different than the dome height) is taller on the CTR pistons.

You could have stated your set up and someone with a similar build could have chimed into to help you out but since you choose not to then I guess you won't get that luxury.

Have fun.

 

must be a top secret build that nobosy has ever thought of before. that is why he is guarding his info so closely.

 

I can make this very simple for you.

If I have a Bone Stock ITR motor.
I remove the ITR pistons
Install CTR pistons
Change nothing else

Is the valve clearance the same after the CTR pistons are installed?

PS: Dome does not effect valve relief directly, you can have a dish piston and high dome piston with the same amount of valve relief.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dropspeed &raquo;</TD></TR><TR><TD CLASS="quote">I can make this very simple for you.
</TD></TR></TABLE>

Being a jerk isn't going to get you anywhere.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dropspeed &raquo;</TD></TR><TR><TD CLASS="quote">PS: Dome does not effect valve relief directly, you can have a dish piston and high dome piston with the same amount of valve relief.</TD></TR></TABLE>

I never said it did, you must enjoy reading between the lines.

I don't know why I am still helping you arrogant *** but no the valve clearance won't be the same because the compression height of the CTR piston is 20 thousandths taller measured form the pin centerline than that of the USDM ITR piston.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EKhatch &raquo;</TD></TR><TR><TD CLASS="quote">
I don't know why I am still helping you arrogant *** but no the valve clearance won't be the same because the compression height of the CTR piston is 20 thousandths taller measured form the pin centerline than that of the USDM ITR piston. </TD></TR></TABLE>

Thank you, That was what I was looking for.

Yes, I am an arrogant ***, but its usually in response to stupid comments like:

must be a top secret build that nobosy has ever thought of before. that is why he is guarding his info so closely.

More often thant not, people on here (and any internet forum) like to toss around "internet-facts" and "my friend told me" facts. Being an *** can wead out some of the stupid comments.

Thanks again,
Mattj

 

u can run ctr in the itr motor with everything else being the same theres more than enough room.

FYI the ctr pistons suck i wish i hadnt put them in my motor and had used jdm pr3 or jdm itr pistons instead.

 

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

Thank you, That was what I was looking for.

Yes, I am an arrogant ***, but its usually in response to stupid comments like:

must be a top secret build that nobosy has ever thought of before. that is why he is guarding his info so closely.

More often thant not, people on here (and any internet forum) like to toss around "internet-facts" and "my friend told me" facts. Being an *** can wead out some of the stupid comments.

Thanks again,
Mattj

</TD></TR></TABLE>

No problem, sorry for being a dick.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by johnzm &raquo;</TD></TR><TR><TD CLASS="quote">FYI the ctr pistons suck i wish i hadnt put them in my motor and had used jdm pr3 or jdm itr pistons instead.</TD></TR></TABLE>

So why do they suck? It's all about things working together. Did the piston fail in some way and that is why you are unhappy. You accommodated for the higher compression with corresponding engine mods/upgrades right? You didn't just throw CTR's in a stock motor and think it was going to put out tremendous numbers did you?

Sorry, but when someone comes out and says such and such product sucks I kinda like to know why.

 

well, the pistons arent made for itr motor.

i have gsr bottom b16 head and ctr piston with itr throttlebody,aebs IM skunk2 cams and jdm dc 4-1

the pistons are easy to detonate on. the valve relieifs arent big enough for big cams. if i were to run high comression again i would get a forged piston that has bigger reliefs, flatter domes, and more detonation resistiance.

BTW power is made in the head, not the bottom. port polish, mill head to get the compression you want. keep flat tops itss better for an allmotor app