I've recently aquired another B18C block, which will be mated to a B16 head with JUN III valvetrain. I am not going to sleeve this one, and thought I would go with 82mm pistons. Kind of an odd size in reality. Anyone have any suggestions? I'm assuming that the block will be able to handle 9.5k revs with these pistons. I do plan on Eagle rods and Rollerwave pistons, unless I get a killer deal on some JUNs. Would it be advisable to run a block guard?

 

Put a block gaurd in if you want to. It's not a bad idea but isn't something that has to be done. I think your spending too much time contemplating the size of the bore. You should be worried about other things like excactly what pistons you are going to run and then worry about the size of the bore based on weather or not you can get the pistons you want in that specific size. I am sure that you can get almost any piston in a relativley wide range of sizes but there are too many other things that need to be sorted out other than trying to figure out the way something is going to work out taking into account every size of bore feesably possible with any given engine. Same goes with the compression. Reaserch the pistons, rods, crank machining bla, bla, bla... Then start getting an idea of what type of compression your are going to be looking at when you start piecing things together. One brand of piston could be geared toward higher comp then another.

P.S. Does any of this really matter at all? When all is said and done I am still going to hand you your *** at the upcoming auto-x events!

Late

 

well you see, son... It's all about torque at this point. I know what compression I need, I know what I'm going to do to the engine. I'm just unsure of how far I want to go. I'm reall on the fence about going 85mm+ 12:1, or not sleeving and running an 82mm bore 12:1 comp. Realistically, it's coming down to time, $$$, and what not. I really want to get some opinions about boring and longevity more than anything. I don't want anther 2am masterpiece... hence I WON'T be milling my head to get compression.

 

Well when you bring boring vs. reliablility into the equation things can get a little tricky. If you go over .25 or so I would get it sleved no questions asked. This cylinder wall are not a reliable item to have. Heat kills and so does milling as a modo! By the way did you say that you have another B18C? Just curious. Looking to throw something together by the time auto-x starts so that I can whoop-up on a certain turbo'd hatch.....

 

anyone else with some thoughts?

 

when you are talking about going bigger than 85mm im wondering if you have ever seen how thick the cylinder walls are, even with sleeves. Believe me there is not much metal there, i had an 86mm b18c. The headgasket is extremely thin between the cylinders. When talking about reliability i would not go with over 85, expecially for street. but if youre just looking for power...hell, go 87. I have an 83mm bore right now on my current motor, with sleeves.

 

is it really benificial to go to 85mm sleeved when you start to compare costs? If I were to go to 85 and then blow my motor, I could go bigger. On the other hand if I went 82 and blew I could go ahead and resleeve it, sell the pistons and get some bigger ones. Inital cost would be less going 82mm but would it be safe?

 

The most i would ever go on stock sleeves is .50mm.... You probably could get away with 82mm but i wouldn't recommend it... Just sleeve it up like me..hehe How are you planning on blowing your motor up??? If something bad **** happens like you shatter a cam the whole motor is goin to be destroyed... If you get piston to valve contact on stock sleeves you most likely crack them, ruin the head, and pistons. That means you won't be selling anything, plus then you have to go through everything again... At the least you would have to get a new headgasket and rebreak in the motor.. Just build your motor right and don't do anything stupid like try to rev it up to 16,000rpm .. You should be fine...


[Modified by JDMspecEG6, 4:44 PM 12/5/2002]

 

Nah man, I just want to go to 10k. I was just hoping that I could beef up the bottom end a bit and not re-sleeve it, at this time. If I don't sleeve then I can get the motor done sooner... sleeving would take a year or two to get everthing done due to $$ and the wife.

 

Yea i know what ur sayin man... $$$ is everything... It's really up to what you wanna do... I would just put the motor together for now if you're gonna have to wait a year.... I think i would go nuts if i had to wait that long to put a motor together... hehe If you still have the option (as in you haven't got your stock block bored and new pistons) I would just overbore .50mm max... Keep it nice and reliable and don't rev it up as high as you wanna go.... There is really no reason to go that high cuz no matter what you aren't goin to make power up there... Erick's racings Civic starts to lose power after about 9900rpm but they still shift at 10500... You have to remember that is a full race motor with awesome tuning and Toda D's... they have a lot more lift and duration than our JUN3's... It's up to what you wanna do but if you wanna build that 10000rpm motor i would wait for ur sleeved block and do the whole thing at once.... latez .... Here's Erick's dyno plot.... http://www.hondata.com/dynoericksracingrc.html

 

.040 overbore (1mm) is nothing to worry about, even @ 9K+ (BTW, there is not much power to be found, even with Jun 3's, after 9-9.2K unless you are going titanium rods and valves and an extreme tune, I suggest skunk 3's if you want the most power from the camshafts); sleeving is not necessary to cope with that little of an overbore, but a block guard should be employed- it is cheap insurance, just make sure it's installed properly as to not distort the bores. Also remember tuning is the most important thing if you want to keep your cylinder walls together. Hammering everything in the cylinder with detonation raises your cylinder pressure to ungodly numbers, making it easy to crack cylinders.
If you are using rollerwave pistons, maybe you should go stock bore and block guard (both for max insurance) and just raise the compression some. You will make up for the negligible gains in displacement you were condsidering by going higher with your compression, since those pistons are notorious for allowing pretty sick c/r without destruction.


[Modified by GTI 1.8t, 2:22 PM 12/6/2002]

 

well I think I'll just go 84mm sleeved with rollerwaves and eagle rods. I've got a B16 in there now, and it's not going to smoting me that much to build a motor for a year or two. I'm just being impatient. I thought 84 would be good so that I have the "just in case" factor... lol. What torque do the bored 1.8s put down?

EDIT- Ahhh... maybe I won't go with rollerwaves.... anyone have some suggestions?


[Modified by advanracing62, 11:12 AM 12/7/2002]

 

Advanracing62 I know you have posted in this topic.... Remember my friend David with the CRVTEC Integra... Anyways he's got 228whp and 152 torque... out of that motor and it is nothing special... Here's the link in case you wanna check it out again... https://honda-tech.com/zerothread?id=346093

 

yeah, that's right... god I'm such a moron sometimes....