so ive had a sound for awhile which i still cant find a source other than possible wrist pin. so im putting together my next build list awhile since its always good to have a plan B.

things that are for sure with the bottom end:

staying with 4g63 block- currently 85mm bore stock 88mm crank
dont want a 2.3l
looking to either go 2.2l or 2.1l
will be using 93oct only
CP pistons will be used
Power Enterprise F1 bearings will be used
CBRD will be doing the blueprinting/balancing/assembly

so ive been looking around at what everyone else has been building and ive come up with 2 options for my bottom end. ill include my calculations for the setups and im sure they are wrong so feel free to enlighten me.

Bottom End Setup 1:

86mm bore
CP pistons 9.5 comp 1.015ch
Mil-Spec 156mm Rods
94mm Crank (idk which brand i want)
specs:
133ci 1.66r/s 2.18liter

156+47+25.781= 228.781 .195mm piston compression height

Bottom End Setup 2:

86mm bore
CP Pistons 9.5 comp 1.015ch
157mm Rods (anyone make them?)
92mm Magnus Billet Crank
specs:
130ci 1.7r/s 2.14liter

157+46+25.781= 228.781 .195mm piston compression height

i like the 2nd option the most as long as im not wrong with my calc, since im just learning this stuff. i need to find a 157mm rod though which wont be cheap im sure. i want to increase displacement but at least keep the stock r/s ratio. my current build is over 25k and id dont see why i cant build something with a better list of parts and get at least 50k out of it.

this car is my daily driver and i mean all seasons daily driver. i also dont have a garage so it sleeps outside. im not looking for crazy power im already at 550hp and am not expecting to make any extra just something more reliable and efficient.

also i dont know of anyone running option number 2, so that tells me im an idiot.

 

Neither will give you enough compression height for a decent piston. Id either do a 150mm rod 94mm stroke on your current block or get a 4g64 block and do a 94mm stroke with 156mm rods.

 

the pistons i listed from cp are made for 4g63 with 94mm crank with 156mm rods. do i would think they will be ok.

 

anyone on these forums anymore?

 

here are my pistons with 6mm more compression height than what you are asking about. moving the pin up 6mm more than mine would not make for a strong piston at all. like i said, i would either stick with a 150mm rod, or go with a 4g64 block with a 6mm taller deck.

 

I know nothing about what you asked but just wanted to say good job on Daily driving your built evo all year. Not many on here with strong builds that drive every day, let alone winter.

 

^thanks for the kind words, i built it in my parents garage back in 2007. thanks to this forum for all the info i needed to get it done. pure luck that its still going after the crap i put it through.

n2oiroc, i sent an email to cp to try and get a pic of the piston since it should be something they stock. i could have sworn that it was a stroker piston with the hole moved 6mm like you show but i could be wrong. i have seen a thread with jam and how they use wrist pin locks plus button ends to help support the oils rings, sounds like a good idea but i dont see anyone else doing this with stroker pistons.

 

i would imagine the oil ring is like mine, but the top and second ring are moved up a lot. the top ring needs to be down from the top for strength.

any reason you are stuck on cp's? they generally make good pistons, but for an evo, they wouldnt be in my top 3.

 

i have wiseco pistons now, when looking at the 2.2 i had found that co already had part numbers for the first setup i was looking at. not realy set on them just liked that they had off the shelf pistons for it.

 

here is the pdf they sent me of the cad which is cool of them. idk if posting it here will work. this is a 9.5 comp piston

 

one of my turbo coolant hoses split while i sat a the bus stop waiting for my son on thursday. gotta love it.

 

ok so to update this thread i believe i figured out my setup. i am now thinking about getting a spare block and maybe even head so i can get parts a little at a time so its better on my wallet.

wheres the best place to source a used 4g63 block and evo 8 head that are still good for machining?

 

ive junked the 156mm rod idea but i still plan on a 2.2 custom setup. im also looking at trying the power enterprise F1 bearings, they seem to be a best bet for longevity at least thats what thier ad says . i have acl race bearings now that have almost 27k on them.

ive been looking at internal coatings and will definitely be coating the pistons(top/sides), combustion chambers and valves. what do ppl with experience with coatings think? id like to do the oil shedding on the crank and rods, maybe the ams oil pan as well. when i say coatings im talking from swaintech by the way.

 

Why not stick with an 88mm stroke, 156mm rod?
Less side load force, and easier on your main bearings.
You're not looking for more power, and you're looking for reliability

 

im gonna try something thats in the middle of the two normal builds with the 4g63. im gonna increase displacement but also increase rod length to get the r/s ratio better then a normal 2.3 but not as good as a 2.0lr. ive been rocking the built 2.0 and i want something different but i dont want a 2.3.