K20 pistons (you bet!)

[hatchninja]

sweet i haven't seen that one before. good find!!

[hatchninja]

been looking out for some k20a2 pistons again. I had pretty much decided to go with forged pistons and rods, but then decided against it. Budget N/A will be slower buy probably more satisfying?

[wed3k]

been looking out for some k20a2 pistons again. I had pretty much decided to go with forged pistons and rods, but then decided against it. Budget N/A will be slower buy probably more satisfying?

you'll be different

cant buy those oem replacements for 200 bucks off that one website?

id do that, deburr and scotch brite the top of the pistons and be good to go.

[The G-Man]

OEM K20A2 pistons under $200 for the set:
http://www.oemacuraparts.com/partloc...layCatalogid=0

[hatchninja]

I just sent a payment of $100 for some k20z1 pistons and rods, they only have 800 miles on them.

[hatchninja]

there's a guy on k20a.org selling k20a2 pistons and rods also. $75 shipped, his SN is cstyleaccord, e-mail/paypal is cham@sapcoonline.net. I would have bought them, but the guy with the k20z1 pistons replied to me first.

[The G-Man]

there's a guy selling k20a2 pistons and rods also. $75 shipped, I would have bought them, but the guy with the k20z1 pistons replied to me first.

Where is he selling them?

[hatchninja]

http://www.k20a.org/forum/showthread...hlight=pistons

[wed3k]

he has quite a few blocks :o

[preludeman92]

I've got some A3 pistons right now. They are weird as hell. I'll have to dig up an adaptor for my camera tomorrow so I can post pics. I don't even want to try and describe them other than to say honda uses some weird anti-knock techniques!

[preludeman92]

Ok, below is a picture of several honda rod/piston combos.

From left to right:

F22A1
K24A4
F23A4
K20A3
JDM H22 PISTON/F23A1 ROD





Now a couple close ups of the k20a3 piston.

[The G-Man]

That is a really interesting piston design.

[d112crzy]

I think you'd have enough valve clearance.

Looks like the top of the pistons might hit the head tho.

off topic:

Looks like the f22 rod is thicker than the f23 rod. Weird.

[The G-Man]

I think you'd have enough valve clearance.

Looks like the top of the pistons might hit the head tho.

off topic:

Looks like the f22 rod is thicker than the f23 rod. Weird.

The real question I think is would it clear the head if it were a K20A2 piston. The dome on those should be taller than that odd protrusion on the K20A3 piston.

[preludeman92]

I think you'd have enough valve clearance.

Looks like the top of the pistons might hit the head tho.

off topic:

Looks like the f22 rod is thicker than the f23 rod. Weird.

I don't think there'd be a problem with clearance of any sort with that piston. The k20a2 piston is much more like the h22 piston design, but with a slightly taller dome to it. Try to get a good look at the k24a4 piston. It has 2 little mountains between the 2 intake and 2 exhaust valves on an otherwise very dished piston. That makes it impossible to run anything other than stock cams at perfect factory timing in our motors and impossible to run the good iVTEC head. The TSX (k24a2) pistons are more like a normal h/f piston.

It's interesting you noted the difference in the f22 rod to the others. It's significantly beefier, has much wider bearings, uses a bigger BE bore, and has rod studs, not bolts. It's too bad honda decided to use smaller rods for the f23 and mainstreem K-series (the RSX-s, 06+Si, and maybe the TSX use beefier rods, closer to the f/h rod design). Whatever, lighter recripricating mass . That means quicker revs, higher revs, and more HP. Downside is less power can be handled.