hello
i have a ek9 ctr here in dominican republic, like a week ago my b16b block get damaged and now i couldnt afford a b16b block, but i have a b18b block, its posible to make that hibrid with internals ctr?, also my doubt is because the piston to head clearance is too low, i think it will be like 0.003", is that too low?

thanks in advance

 

https://honda-tech.com/search.php?searchid=10389314

 

this link doesnt work

 

Don't waste your time. The result is a heavy piston and a compression level that is higher than pump gas will tolerate without adverse affects. B16A pistons do the job well though in a b18b.

 

b16b block = b18c block (b18c1, b18c5, b16b, b18c) all the same block

 

There is a slight diff in the deck height hillbilly.

PCT pistons should be used in B16's only.

 

as long as he is using a b16 crank, he should not have any problems using any of those blocks i mentioned. correct???

 

https://honda-tech.com/forums/all-motor-naturally-aspirated-44/attn-people-who-rebuilding-gsrs-hate-ctr-pistons-2931459/

 

I misread the point of this thread. Yes as long as he used his rotating assembly he would be fine.

That thread you referenced I don't consider to hold much water. That is one motor that has survived(we think), but how many have blown in comparison? There is one person I know of for sure that saw that thread, went with his piston choice, and soon after tuning it popped. It's safe to say that 9 times out of 10, PCT's in a gsr motor is not a good idea.

 

fasho, wasnt disagreeing with you, or saying that this one thread proves anything. just throwing stuff out there to see what your opinions are.

so you think the reason motors dont last with these pistons on 87-89mm cranks is cuz of the piston weight?? does a 81mm pct piston weigh more than a 84mm piston?
or so you think the flame travel is somhow killing these motors?

 

It's the compression levels that it puts the 1.8 motors at that kills them.

In a ls/vtec, it's gonna be over 14. If it's a gsr it's 13+. There are better, more effective ways to gaining compression than using these pistons. Just not a good idea.

 

how is 13:1 catastrophically dangerous to 9/10 motors if they are tuned well?

please dont take my questions as sarcasm or ignorance. i really wanna learn this so i can give a good explanation when someone asks me.

if i built 2 motors. both gsr's. motor "X" had p73 pistons, and 13:1 compression say due to head milling and smaller head gasket and flat valves and so on. and then motor "Y" had 13:1 compression using PCT pistons. both tuned by a reputable tuner perfect AFR's. All else being equal, Is there a reason why you would say Motor X is going to be more reliable than motor Y?

 

whats wrong with high compression?? i've done race motors with a LOT higher than 13:1 compression.. and the dome on those pistons is much larger.

whats your deal with ctr pistons?? because a street car will need to run higher octane fuel to use these.. heavier pistons?? are you fking kidding me.. its not like one is a lead block and the other is a feather..

I guarantee you that if i put a motor together with itr pistons and i put the same spec motor together with CTR's i'm going to make more power with the CTR's...

We ran low 11 sec 1/4 miles runs in a street car with CTR pistons..

and flame travel?? you think those custom 15:1 or 16:1 comp pistons dont have a giant dome?? maybe you havent seen a custom piston before??

And whats a better more effective way to gain compression without something that will cost a hell of a lot more than $100 CTR pistons?

 

THE ONLY THING THAT MAKES ME UNSURE TO BUILD IT ISS THE PISTON TO DECK CLEARANCE THAT IS 0.004"

 

you would have to clay the motor and make sure its safe.
look for p2v clearances. or just run a "1.8L vtec block."

 

Run your ctr pistons. I don't care.

Have a nice day.

 

You dont have respond to other people who are being rude. But would you answer my question which was asked respectfully?

 

https://honda-tech.com/forums/showth...2884964&page=4

 

good thread, ive read through it before. there are many arguments, but what i got from that thread is that it is completely possible to make PCT pistons work in a gsr, you just gotta check all your clearances and make sure nothing is going to smack anything else.
13:1 compression is totally do-able with modern tuning on 93 octane. just have to clay the motor, check clearances and make sure no 2 separate moving pieces of metal are going to run into eachother. right?

 

Have you ever seen a custom piston? they are MUCH more domed than a Ctr and have no problems with "Hitting the head" unless somebody milled the crap out of the cylinder head beforehand CTR's won't give any issues with hitting the head.. (don't pay attention to these people who havent even used them before and are still stuck on some old BS internet rumors)

i've done many CTR builds with success, they do need tuning as the higher compression tends to make lean conditions. but as with any build (except stock rebuild) i would hope the person tunes the motor before just taking it out and beating on it..

Feel free to use whatever pistons you want but if you do decide on CTR's i think its a better decision. i've made very good power with CTR's.. a lot more than the ITR builds.

Anyway Good luck with whatever you decide to do.

 

For your question, Milling the head is not the way to increase compression. Bringing the pistons closer to the valves by milling the head and running large cams = boom..

you can raise compression without using just piston dome height by running a lower dome height piston and then reworking the cylinder head combustion chamber, Cloverleaf or similar design.

I'd rather just run a high compression piston though. better than the milling, flat valves, or combustion chamber work.

all up to you in the end

 

Put the B16B head on a B18B or B20Z block and call it a day.

 

Lol yes I know all of that. But you didnt answer my question?

 

Oops sorry didnt see you first comment. Thanks for the good info

 

Why would you tell someone that building an lsvtec is as easy as tossing a vtec head on a ls or b20 block? People are gonna read that and take u seriously....