B16b(pct) CTR pistons????
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Joined: Mar 2007
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From: Medway, Oh, USA
B16b(pct) CTR pistons????
I just purchased a brand new set of jdm ctr b16b pistons(pct)...where they worth the money???Has anyone run these in an ls-vtec setup???Just lookin for someone who has run these particular pistons!!!!
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Joined: Apr 2003
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From: In the garage
Re: B16b(pct) CTR pistons???? (TNT)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TNT »</TD></TR><TR><TD CLASS="quote">I just purchased a brand new set of jdm ctr b16b pistons(pct)...where they worth the money???Has anyone run these in an ls-vtec setup???Just lookin for someone who has run these particular pistons!!!!</TD></TR></TABLE>
Those pistons carry so much hype its rediculous. Sell them and get something thats going to allow for lower compression levels.
Those pistons carry so much hype its rediculous. Sell them and get something thats going to allow for lower compression levels.
FSAE
Joined: Jan 2002
Posts: 5,495
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From: Drinking Beer, UT
Re: (TNT)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TNT »</TD></TR><TR><TD CLASS="quote">I did he calculations and with a 3 layer gasket i figured up id be running 11:9 compression with the b16a head....why is everyone sayin itll be so high?!?</TD></TR></TABLE>
If you are using an online "compression calculator", it is wrong.
You need to take into account compression height, along with dome height. I have yet to see a "compression calculator" factor compression height.
As far as PCT's go in 1.8L's, worst piston you can run IMHO. The dome obstructs flame travel and just is too much compression to run on a cast piston. You can make the same power, if not more, using P30's.
If you are using an online "compression calculator", it is wrong.
You need to take into account compression height, along with dome height. I have yet to see a "compression calculator" factor compression height.
As far as PCT's go in 1.8L's, worst piston you can run IMHO. The dome obstructs flame travel and just is too much compression to run on a cast piston. You can make the same power, if not more, using P30's.
Re: (TNT)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TNT »</TD></TR><TR><TD CLASS="quote">I did he calculations and with a 3 layer gasket i figured up id be running 11:9 compression with the b16a head....why is everyone sayin itll be so high?!?</TD></TR></TABLE>
i guess you're using the c-speed calculator. it doesnt take into account the pct's taller compression height.
using the http://www.zealautowerks.com calculator which does use different compression heights it comes out to 13.9:1.
these are just general estimations but it gives you a good idea.
i guess you're using the c-speed calculator. it doesnt take into account the pct's taller compression height.
using the http://www.zealautowerks.com calculator which does use different compression heights it comes out to 13.9:1.
these are just general estimations but it gives you a good idea.
Re: B16b(pct) CTR pistons???? (TNT)
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Joined: Apr 2003
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From: In the garage
Re: (doood)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by doood »</TD></TR><TR><TD CLASS="quote">
i guess you're using the c-speed calculator. it doesnt take into account the pct's taller compression height.
using the http://www.zealautowerks.com calculator which does use different compression heights it comes out to 13.9:1.
these are just general estimations but it gives you a good idea.
</TD></TR></TABLE>
Stick with the Zeal one. The C-speed is only as good as the information you put into it. Unfortunately, a LOT of people don't know the compression height changes with those pistons. I made the mistake a long long time ago and put CTR pistons in my B17. Took me a while to figure out why it wouldn't pass california smog and the NOX levels were WAY up there. After reviewing the facts and seeing that the pistons actually came OUT of the hole (as they also do on B16's), it was pretty clear the cause. Zeal is actually developed by a friend of mine and the reason behind it was because of the CTR pistons. Too many people don't know the truth. Even to this day people still argue.
i guess you're using the c-speed calculator. it doesnt take into account the pct's taller compression height.
using the http://www.zealautowerks.com calculator which does use different compression heights it comes out to 13.9:1.
these are just general estimations but it gives you a good idea.
</TD></TR></TABLE>
Stick with the Zeal one. The C-speed is only as good as the information you put into it. Unfortunately, a LOT of people don't know the compression height changes with those pistons. I made the mistake a long long time ago and put CTR pistons in my B17. Took me a while to figure out why it wouldn't pass california smog and the NOX levels were WAY up there. After reviewing the facts and seeing that the pistons actually came OUT of the hole (as they also do on B16's), it was pretty clear the cause. Zeal is actually developed by a friend of mine and the reason behind it was because of the CTR pistons. Too many people don't know the truth. Even to this day people still argue.
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Joined: Apr 2003
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From: In the garage
Re: CTR pistons (kartman5)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kartman5 »</TD></TR><TR><TD CLASS="quote">My son is running CTR pistons in his B16 and has had no problems. He uses
it for a daily driver and again, no problems. Good luck!</TD></TR></TABLE>
Compression in a B16 with those pistons is around 11.9 assuming no head milling or anything else. I could see that as "do able" on california 91 octane. In the B17, its 12.5:1... which is something I would say is not smart on 91 octane. Especially since the summers up here get quite hot. You are going to see issues.
it for a daily driver and again, no problems. Good luck!</TD></TR></TABLE>
Compression in a B16 with those pistons is around 11.9 assuming no head milling or anything else. I could see that as "do able" on california 91 octane. In the B17, its 12.5:1... which is something I would say is not smart on 91 octane. Especially since the summers up here get quite hot. You are going to see issues.
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Joined: Nov 2006
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From: MoonSHINE Metropolis, .FL. Run Free, North America
Re: CTR pistons (Hybrid93Eg)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hybrid93Eg »</TD></TR><TR><TD CLASS="quote">You are going to see issues. </TD></TR></TABLE> What sort of issues?
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kartman5 »</TD></TR><TR><TD CLASS="quote">My son is running CTR pistons in his B16 and has had no problems. He uses
it for a daily driver and again, no problems. Good luck!</TD></TR></TABLE>Sweet. how longs he been running for??
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kartman5 »</TD></TR><TR><TD CLASS="quote">My son is running CTR pistons in his B16 and has had no problems. He uses
it for a daily driver and again, no problems. Good luck!</TD></TR></TABLE>Sweet. how longs he been running for??
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From: In the garage
Re: CTR pistons (MotorSpecies ver1.6)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MotorSpecies ver1.6 »</TD></TR><TR><TD CLASS="quote"> What sort of issues?
Sweet. how longs he been running for??</TD></TR></TABLE>
This is the problem with Honda-tech. Did you read all of what I wrote? *IN A B17* with CTR pistons, 12.5:1 compression + hot summer days + 91 octane is going to lead to problems. Mainly detonation. Now, *IN A B16* the compression levels are a half point lower. I could see this setup possibly working without issues. Would I do it myself? Hell no. Could it be done, I am sure. Just because you hear about someone who "has it working" also doesn't mean there are no isssues. Did the guy whos son has the pistons clearance the engine? Did he check piston to valve and valve to valve clearances? How much adjustment does he have with adjustable cam gears? How much total timing is he running? Think of it this way... If you have 12.0:1 compression, everyone thinks "awesome, more compression, more power".. Well, yes, but only to a point. There will come a time when you have to start pulling timing to prevent detonation. Whats the point of high compression if you just pulled all the timing out of it and lost power as a result? Then there is the issue of clearances. The domes on the CTR pistons are quite large. This combined with the fact that on a B16/B17 they come out of the hole = very little clearance. I was right on the edge with my B17 when I checked clearances and all I had was a set of stage 1 skunk2. I had a maximum of +/- 2 degrees I could move the cam gears with that setup, thats it! Now, you tell me what value you feel these pistons hold when you will be limited in how large of cam you can run and also most likley wind up pulling timing to compensate for the compression unless you run higher octane fuel? Then there is the fact that the piston weighs a good deal more then say PR3's or even ITR's. I'm sure we all should have at least some understanding about what adding weight to the rotating assembly will do for the engine.
Bottom line, there are MUCH better piston choices out there then the over hyped CTR pistons. Everyone seems to flock to them because they don't understand compression height and can't think for themselves. They use the online calculators which have the wrong information in them and get "good" results that they think will be ideal for the street. In reality, there is a lot more to it then just running the highest compression possilbe. Not to mention the fact that most people don't even know how high compression these pistons will REALLY yield.
Sweet. how longs he been running for??</TD></TR></TABLE>
This is the problem with Honda-tech. Did you read all of what I wrote? *IN A B17* with CTR pistons, 12.5:1 compression + hot summer days + 91 octane is going to lead to problems. Mainly detonation. Now, *IN A B16* the compression levels are a half point lower. I could see this setup possibly working without issues. Would I do it myself? Hell no. Could it be done, I am sure. Just because you hear about someone who "has it working" also doesn't mean there are no isssues. Did the guy whos son has the pistons clearance the engine? Did he check piston to valve and valve to valve clearances? How much adjustment does he have with adjustable cam gears? How much total timing is he running? Think of it this way... If you have 12.0:1 compression, everyone thinks "awesome, more compression, more power".. Well, yes, but only to a point. There will come a time when you have to start pulling timing to prevent detonation. Whats the point of high compression if you just pulled all the timing out of it and lost power as a result? Then there is the issue of clearances. The domes on the CTR pistons are quite large. This combined with the fact that on a B16/B17 they come out of the hole = very little clearance. I was right on the edge with my B17 when I checked clearances and all I had was a set of stage 1 skunk2. I had a maximum of +/- 2 degrees I could move the cam gears with that setup, thats it! Now, you tell me what value you feel these pistons hold when you will be limited in how large of cam you can run and also most likley wind up pulling timing to compensate for the compression unless you run higher octane fuel? Then there is the fact that the piston weighs a good deal more then say PR3's or even ITR's. I'm sure we all should have at least some understanding about what adding weight to the rotating assembly will do for the engine.
Bottom line, there are MUCH better piston choices out there then the over hyped CTR pistons. Everyone seems to flock to them because they don't understand compression height and can't think for themselves. They use the online calculators which have the wrong information in them and get "good" results that they think will be ideal for the street. In reality, there is a lot more to it then just running the highest compression possilbe. Not to mention the fact that most people don't even know how high compression these pistons will REALLY yield.
Honda-Tech Member
Joined: Jan 2003
Posts: 2,841
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From: the backwoods, usa
Re: CTR pistons (Hybrid93Eg)
a couple years ago a local kid built and lsv with ctr pistons and it made like 156whp on race gas(because it wouldnt run on pump) on a mustang dyno. at the time we had a gsr with itr pistons making 184whp on pump gas on a mustang dyno. i'm guessing that kid wished he would have run different pistons