Can you use full floating wrist pins with prelude type s pistons if the rods accepts them or does it have nothing to do with the piston itself just the rod ?

 

wrist pins either float or press into the piston.

they always float in the rod.

if i remember corectly the type s wristpins are larger than the h22 wristpins. so if you want to use the s pistons w/ h22 rods you will have to machine the bushing in the rod to accept the larger wristpin.

 

you can use a set of rods from a 97+ prelude they have full floating pins
and pressed pins are designed to be retained by an interference fit in the rod.
full floting pins simple slide through the piston into the rod and are retained on each side by a snap ring

 

well im going to be using type s rods. So are full floating pins gonna work ?

BTW stock h22a4 USDM bone stock what type of wrist pins do they have ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Missing Gears &raquo;</TD></TR><TR><TD CLASS="quote">wrist pins either float or press into the piston.

they always float in the rod.

if i remember corectly the type s wristpins are larger than the h22 wristpins. so if you want to use the s pistons w/ h22 rods you will have to machine the bushing in the rod to accept the larger wristpin.</TD></TR></TABLE>

According to my 4Gen Helms, the wrist pin fit in the rod is an interference fit. There is 0.0005" to 0.0010" clearance between the wrist pin and the piston. It's not a press fit in the piston, it's in the rod. That's why there are no retaining clips on the 4Gen.

On a 5Gen the wrist pin floats in the rod and the wrist pin. The clearance between the wrist pin and the piston is -0.0001" to 0.0002", so it can be a very slight interference fit. The clearance between the pin and the rod is 0.0002" and 0.0006", thus it's a floating wrist pin. Hence the need for retaining clips.

Also the 4Gen uses a larger wrist pin according to my Helms manuals, but I have not measured a 4Gen wrist pin myself. I have measured plenty of 5Gen wrist pins, and the Helms is right on. It's just a tad under 22mm.

From what I remember, the Type S wrist pins were the same diameter as the 5Gen wrist pins, which are supposedly smaller in OD than the 4Gen wrist pins. I have a set in the garage I can double check tomorrow.

 

hmmm so will i need a press for install ?

 

If you use rods that are made for the Type S pistons, you will not need a press. You could use 97+ H22 rods or Eagle rods that are made for the Type S pistons.

 

i dont know if its because its so late right now, but i seem to remember the stock wristpins in my 94' jdm h22a floating in the rod and pressing into the piston?

maybee i just need to get some sleep

 

You're saying that you're going to use Type-S rods with Type-S pistons...so what exactly is your problem?

 

Will i need a press to install them are are they full floating pins and slid right in and just use that lock thing on the two sides.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Missing Gears &raquo;</TD></TR><TR><TD CLASS="quote">i dont know if its because its so late right now, but i seem to remember the stock wristpins in my 94' jdm h22a floating in the rod and pressing into the piston?

maybee i just need to get some sleep </TD></TR></TABLE>

haha, yeah I think you got it backwards. If you pressed the pin into the piston you'd most likely deform it. I can't speak for the H22a4's but the a1's all had press fit rods and slip fit pistons. The type-s are full floting and the pins are a bit bigger by .001" I believe. IMO either type rod would work on a type-s piston, but if not made specifically for the type-s you'd have to hone it either for the proper "floating" clearance, or to avoid excessive press fit from the oversize pins.

 

to install the type s pistons on a type s rod you do not need a press.

First you install one of the snap rings in the piston. when the piston is at room temperature the pin will not fit in the pin boss. Using a heat gun heat the piston to
158 degrees as stated in the manual. now lubricate the piston pin with new clean engine oil. Now the pin will slide easily into the piston pin boss. Install the other snap ring and allow the piston to cool at room temperature.