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Mike, sorry to bother you, if you don't have time don't worry about answering. In 6 months I am getting my hands on a 96 JDM ITR (how you ask? why a direct import from japan, I live in New Zealand so it is relatively easy to do). I have a goal for it of 200whp on 98 octane gas. To do this I am planning; Hi-tech exhaust system, cam gears, Apexi V-AFC, Iceman CAI, FPR, Spark plug indexing, underdrive pulleys (I know they can be a waste of time but if it's the difference between 198whp and 200whp I will get them) and dyno tuning with a wide band O2 sensor. My question is, if this is not enough to get me to my goal and I decide to up the compression, whether it be CTR pistons or a 2 layer head gasket will I then be undercamming my engine? (particularly if I get the CTR pistons because they will give me a 12.1/1 CR). I am also slightly confused about the stock CR of the JDM B18c5, I was under the impression they ran a 11.5/1 CR due to the 100 octane off the pump in Japan, but I have read that you stated that they were an 11.1/1 CR in a previous article. Any advice is muchly appreciated.

P.S. I am also thinking about a port and polish job from my local Honda motorcycle specialist.
 

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I am hoping to hit around 200whp on stock cams as well. I a more robust engine management program like the Hondata would net better gains than a simple V-AFC. You would need an OBD2-1 conversion for it and someone capable of tuning Hondatas in your area.

The B18C5 engine is for North America only. A JDM Type R engine is simply coded B18C. So if the engine block you get says B18C5 you got a USDM engine.

The B18C-R does run 11.1:1 stock, if you drop in CTR pistons I believe it will put you at about 11.7:1.
 

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okay.. mike, you say that they do not "need" that compression to make over 200 whp.. in other articles you say that under camming for compression may hurt hp in some instances.. would this be an instance?
im thinking that even though ctr cams may not "need" a ctr piston.. does it hurt to have a bit more compression they give in this case?

buying ctr pistons, or JDM itr pistons cost basically the same price. so i'd rather just stick with the ctr piston for higher compression as long as i can tune it right for daily driving with the ctr cams.

basically what im saying is.. in a b18c motor.. if you were going to drop in new oem pistons.. would you go max with ctr pistons, or settle for jdm ITR, and a thin headgasket? this is of course using ctr cams, or possible upgrading to skunk stage one.
 

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I'd say you should plug in the numbers into the Dynamic CR Calculator using the static CR you would get with CTR pistons vs JDM ITR pistons and see what the cylinder pressure is that you get.

compare those cylinder pressures to stock...tell me what you get for dynamic CR for stock CR with CTR cams, CTR CR with CTR cams, JDM ITR CR with CTR cams...

the CTR intake cam's ABDC valve closing spec is 45 degrees.

Is Diamond Bar at sea level? if not you must be close so I imagine 50-100 ft altitude would not be a stretch for you.

I don't know Skunk2 Stage 1's intake ABDC closing spec...perhaps you can call them and ask for the lobe separatyion angle (LSA), overlap, and ABDC spec for the 3 stages of their cams for me?....that would be a huge help for everyone here. thanks
 
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