Roul Rosenow

hi there people hope your all doing great ....


i want to put h22 pistons on h23 connecting rods can i use the old pins if they look good ,,,,, and measure correctly ......


please no maybe or i think so

thanks and greetings from germany

JRCivic1

Using the pins over again just because they look good isn't the issue... the issue is WHY ??? New pins are cheap, and usually come with a new set of pistons.

The real question you should be asking here is why do you think H22 pistons will work on a H23 rod/crank combination ??? You do know that the install height of the H22A piston is nearly .020" taller than a H23 piston, and thus, will stick up above the deck of the block. This will cause piston-to-valve interference unless you have a really thick head gasket to gain back the quench area.

Can you give us more information so that we can help you better ???

98vtec

I am assuming you are using a h23/f22 crank with using a shorter rod? It's a common build though.

I've never had to do this because I have always used new after market rods and Pistons which are typically floating style pins, but the h23 uses a press fit piston pin and I believe there to be two different styles of SE bushings for press fit and floating pin rods. Newer h22s used floating pins but the older h22/h23 Pistons were press fit and I would be weary of reusing press fit pin Pistons and their pins. It is just a cast piston, pressing the pin out could easily hairline crack the Pistons and you would never know until the engine came apart while running. Plus the pins could be bent which will surely damage the Pistons.

If you can provide us with more information, we can help you better

snobordboy

It is possible, I re-used the pins in a press-fit setup for my budget H23 Vtec build. The pin presses into the rod, but you must properly support the piston when pressing, or it can damamge the piston as 98vtec said. Honda makes special tools for this task, or you can attempt something else, with possibly varied results.

If I were spending more than a few hundred dollars to build/ rebuild a bottom end, I would get new rods and pistons, and get the floating wrist pin style, as it inspires much more confidence in my mind.

With the H23 crank, I think the best option with stock parts would be rods from an H23A bluetop, and type-s pistons. This would require a rehone for new pistons, and I have only been able to find type-s pistons in first overbore, no A or B size, at least not OEM Honda parts. This solves the deck issue, as the H23A rods are .020 shorter than H23A1, so deck height is perfect, and compression ends up nearly identical to the H23A1 rods and H22A pistons.

Roul Rosenow

ok ok

there is no issue with valve clearance using a h23 crank+connecting rod and piston with h22 head for starters ..... yes piston does stick out i believe it was 0,02" but does not touch the valve ... as long as you use standard head gasket


the reason why i asked is that i didnt want to get new pistons as i have used h22 pistons of my old car and wanted to use them ....
see i have all parts already. i need to know if this works as i do not want to sleeve the engine and get aftermarket pistons

rebuilding buttom end is already startet with new bushings , balanced crank,flywheel pulleys and balanceshafts eliminated .,,,,,, seee guys if you live in europe getting the right parts isnt as easy shipping and toll is expensive.

im gonna inform myself if i can get a press thanks

JRCivic1

snowbordboy, you stated that " This solves the deck issue, as the H23A rods are .020 shorter than H23A1"... however, why would this be considering the piston itself has a compression height that is .019" LESS than any H22 piston ??? Incidentally, the USDM H23 non vtec and the JDM H23A VTEC pistons have the same compression height. It sure seems that the unique part is the piston and not the rod... can you confirm otherwise ??? I have never measured a H23A VTEC rod, nor do I have one available to do so... just wondering if you had in fact done a side-by-side comparison with a H22A rod.

snobordboy

Sorry I missed this earlier.

Yes, I have compared the rods from an H23A1, H23A, and H22A side by side. So have many other people, most reliably measured would be by Rosko.

The reason for the shorter rod in the H23A compared to the H23A1 would be the dome height of the piston, in the vtec model with higher compression and different head design.

This works to the advantage of someone trying to build an H23 Frank with good clearance, especially if they want to use H22 stock pistons, even more so with aftermarket cams.

The stock engines are built with a bit more "safety margin" than what many people use for frankenstein builds, hence why we can come up with different combos that work together that are a bit different than what came from the factory intended for 100-200+ K mile life and emissions, fuel and such reliability.