HiProfile

I was searching for the Wiseco piston P/N and found different pistons they now offer for the Evo8: K667M855AP & K669M855AP

I think this may be a better option for many reasons. The valve reliefs should be in the correct spot, since EVO 4g63 pistons are reverse of DSM pistons. They also have much larger valve reliefs. They are the more modern "strutted" pistons, so they may be lighter and/or stronger. You can get it in many sizes from 85mm to 87mm, whereas the K596M only ranges from 85mm to 86mm. They also increase compression a bit for those who want to use an H22 head. They achieve that with a smaller dish along with a slightly higher compression height (28.88mm vs 28.7mm); they still sit 0.005" below the deck. They also use Wiseco's new "Armor Plating", which they claim is the proverbial better mouse trap. Keep in mind the K669M piston has special gas ports and a slightly thicker wrist pin made from tool steel than the K667M & K596M used in the OP's motor.

The best part from most people's perspectives: they're cheaper! $37 from the vendor I was looking at.


K667M855AP Compression ratios
F22 head, 85.5mm: 8.56:1
H22 head, 85.5mm: 8.18:1

K669M855AP Compression ratios
F22 head, 85.5mm: 9.39:1
H22 head, 85.5mm: 8.93:1

K596M855 Compression ratios
F22 head, 85.5mm: 8.13:1
H22 head, 85.5mm: 7.79:1

http://www.importperformanceparts.ne...itsubishi.html
http://forums.evolutionm.net/evo-eng...eleases-3.html

GhostAccord

Why not just get pistons that are made for your engine? How much are you really saving byu buying these pistons that aren't designed for your engine?

$470 for EVO pistons that aren't 1005 fit or $500 for custom fit Wiseco's from race engineering that are 100% fit and the exact compressionm ratio that you are looking for.


Makes no sense to run aftermarket DSM shelf pistons in a Honda when you can get custom fit for a few bucks more!

HiProfile

Can you tell me HOW to get that price? It seems odd that they offer custom spec pistons for $500 when their Wiseco F22 shelf pistons are $559. Is there a coupon code I don't know about?

If not, then it comes down to two reasons: 1) Price, 2) Time. Custom piston's don't exactly come off a 90-second waffle iron, and certainly not for less money than a shelf piston. The EVO pistons are also more than enough regarding valve clearances; the EVO head is 34mm/30.5mm, the F22A head is 34mm/29mm, and the H22 head is 35mm/30mm. Considering the OP's motor has worked great for ages with pistons that have the intake & exhaust sides flipped, I think many people will agree the money saved can be put to other go-fast uses.

GhostAccord

I got them from the boys at Race Engineering, they did all the leg work for me as well. I told them what I had for an engine and what I wanted for bore and compression and they ordered them from Wiseco for me. Right now they have Wiseco piston and Rod combos starting at $800 and up. All you have to do is make a phone call or send them an email to have them change that to custom pistons for a little bit extra. That is a fact!

This is what my bill says;
Carrillo H22 Pro-A Con. Rods - $720
Wiseco F22 pistons - $510 w/89mm bore, 29.08mm CH, 0.06cc Dome

Had them to my door in 3 weeks after payment!

Realistically there are no custom parts or quality engine machining that you would get done in a week without paying for it. It doesn't take long to realize, that in the world of engine building, at some time you are going to end up waiting for quality parts and craftsmanship. It's well worth it in the end. Everything fits as it should and the parts are made specifically for your build.

Try getting any sort of warranty if you have EVO pistons in an F22...... be lucky if a shop would even offer a warranty for the machine work in this case.

You mention valve clearance, seems as though the valve diameter is good, how about the valve angle?

All in all, it really is too each his own. and just because it works, doesn't mean that it works as well as it should have! After all we are only talking about $100/$150 dollars to have it done right.... not going to get much in the way of quality go-fast parts for that.

HiProfile

The H22 & 4g63 both use the same 28 degree valve angle, and I presume the F22 has less than 25* (H23 is 25* and F22 is said to be less). We already know it works fine with an F22 head, so the H22 head should technically work better especially with the reversed EVO piston design.

Sure we can spend a few bucks here and a few weeks there for the right parts. But then we end up with a never ending blog instead of time slips. No offense, but I'd rather have a half-assed bulletproof motor making good power than a boat anchor that's built like a Swiss watch.

GhostAccord

No offense taken... that endless blog makes money. I appreciate that you took the time to visit.

Not sure if it is clear or not but I'd really rather not put my name on anything halfassed. That's just me. I don't own a boat so I have no need for a boat anchor ether. I like to refer to it as garage jewellery or an attractive conversation piece.

thehatchninja

I researched this in '04. Some guy actually tried it, it's all in this thread.

http://www.cb7tuner.com/vbb/showthread.php?t=21173

ashb82

Have not been on here in a very long time. My kids got into sports and I quickly became as obsessed with there sports as I was with Hondas. This engine setup is running just as good now as it did before. The car is setting in my garage waiting on the day I'm ready to race again.

jwicecold

Hell yeah right on!!!! Glad to hear it!!! Please explain to these guys why you decided to go with the pistons you did and not with boring STOCK pistons!!! I bojght me the 4g63 pistons as well and cant seem to make few of em realize why!

BeastlyB

That is good news

Can you give us an amount +- of how much km you drove with it?

Thanks for keeping us updated.

L.a.

Any videos of the car?

N8vSi

Great build, It was a good read with lots of awesome information.
I am aimed at building my f22b2 with a Evo 8 16g twin scroll setup, I will make a build thread and document my journey, can't wait.

Andryzzle

I think some of the subscribers may be interested that I'm parting ways with some BNIB 4g63 pistons and h22 rods if anyone wants to follow ashb82's lead on this build.

https://honda-tech.com/mid-atlantic-...hings-3104025/

edit: I don't mean to derail this thread, just PM me or reply to the linked thread.

LeeMajors19082

I'm interested.... plz pm me asap. With price and detailsm

mr.tatertits

Hey ash, I know this build is old but what would be your opinion on using factory 4g63 pistons? I'm on a budget and dropping 500 bucks on pistons will set me back a good bit. What do you think the max hp/psi limits would be?

Samidrk268

hello am about to start this same build. what type of piston rings did you use I have oem 4g63 piston from an evo 3 an they have on the oem piston rings. what type of rod bearing and main bearing did you use thanx

dbsharp

FYI, I built a setup with k596 pistons w/ Holset at 375WHP. I tore my engine down after 100k of beating on it daily because it was running like ****. Pistons showed a little wear, but nothing bad. My valve guides were worn the hell out and that's it! I probably could have gone another 100k on the bottom end, so I am throwing it back together and have been getting the head right. Had the block honed to get the cylinders back round, and it didn't take much at all and they look great.

500 WHP or bust this time. I don't regret building this setup at all.

CloudR

legit build!

LeeMajors19082

I also did this build in my DD and since Ash is rarely (if ever) active anymore I thought maybe I can help out...?

I'm not sure that the Stock 4g63 pistons will work?... I say this because this build is based on a .5mm overbore. I'm sure it's possible to just hone the cylinder walls and use the OEM 4g63 piston without overboring but that would alter the VE, displacement, and CR slightly. Also the point of using the forged 4g63 pistons was the endless aftermarket support, availability, and most of all, COST of the pistons vs buying custom or Bisi pistons for the F-series. I'm not sure about the OEM 4g63 pistons being forged and/or much beefier than the OEM Honda pistons, so if I were you I'd be sure to do an extensive amount of research on that before tearing your engine apart for a minimal gain..?

And in terms of hp/psi limits I'd have to say (if you use the OEM 4g63 piston) it'd be the same as the limits of a stock 4g63, because you chains only as strong as it's weakest link.

I can't speak for Ash but in my build I used the ring set that came with my Arias pistons. Iirc they were chromoly? For bearings I used Clevite tri-metals but I'm pretty sure Ash used ACL Race bearings (this was before ACL went to **** though). Nowadays King bearings seem to be the "go-to" IF you don't want to spend the money to buy OEM Honda. And of course the sizes will all depend on your clearances.

This is GREAT to hear! I haven't got 100k on mine yet but I'm quite sure I'll get it there. What exactly are "k596 pistons" though, I've never heard of these?

Definitely a solid F-series build here

ashb82

sorry for not being active but my engine is still running maybe one day i will put the car back on the road

MytealCB7<3

I cant wait to turbo my f22.

GSeries

Wow, I have not been on this site in years and randomly found this thread. I did the 4g63t pistons on f22 rods way back in 2005 but used a f22b block with h22 head. It is not a bolt on project. It requires some machining and custom head gasket work. My swap was in a 93 eg hatchback and is now in a 98 accord and still running strong in 2022. Stock sleeves no issues STD bore. No leaks. Prep is key. But yes, just confirming this is a solid build for whoever is on budget and has access to a machine shop.

Sisol95

I have some questions about this could you message me when you have time?

GhostAccord

ashb82 hasn't logged in since March of 2020, doesn't mean he won't message you though. One never knows.

Sisol95

I noticed I was just hoping he might. I was reading through this and never saw if he had to make the valve relief cuts deeper on the pistons to make the setup work. I’m wanting to turbo my 96 LX but I’m not looking to make any big Hp just 250-280ish range it’s my daily and just want to make it a little more entertaining to drive but still be reliable