new valves, pistons, etc...

[markmdz89hatch]

Ok, so as many of you may or may not know, i'm going to be doing a 2x45DCOE swap on my car soon enough. However, I'm not going to cut any corners, or cheap out on anything. And (I know it's a little late in the game) I need to put together a price list for all the stuff.

What I'm having trouble finding is someone to make valves for the stock A20 head. I'm going with the full head and block from an A20A3. I also am having serious trouble deciding on what compression pistons I should run. I am keeping it N/A so a high compression is desireable. (I think.)

I decided to go with Wiseco for the pistons, but I can't order them until I know what compression to run. Also, for the valves, being that I'm gonna be running these pistons, should I get them made shorter then stock for clearance reasons? Fuel and ignition are not a problem, that's under control.

I just need an estimated price list on getting a head hot-tanked and P&P. The new pistons, new valves, P&P on the manifold, and any other engine related items I should consider.

Also, does anyone have even a guess as to the power gains of this conversion compared to a stock A20A1?

Any feedback is appreciated...

[shepherd79]

i know you can get stock valves from Adance auto parts.
i think you should be fine with 11:1 compression as long as you going to use 93 octane.

[Grant2k]

you should find out how much piston to valve clearence is now, and then see how high of a compression you can realisticly run. if there is a lot of room for a high dome piston, than go for it. but if you shorted the valves they won't open as much.

[Mike's89AccordLX]

Alright I was just wondering if LX-i pistons can be swapped in without changing the valves?

[shepherd79]

i don't see why not. LXi has the same valves plus LXI has higher lift cam.

[kraftaroni]

Wiesco, I would highly not recomend using wiesco pistons. They are a cheap alternative to JE Ross or Arias but The castings they use seem to be more flawed than the oter companies. I was a machinest for Ross years ago and i think JE Arias and Ross are the best on the market. I race dirtbikes and have used many many wiesco pistons because for a while it was the only alternative to stock. The machine is fine but the quality of the material is poor. Its Ironic that I'm writing this today because I took apart an engine earlier today that had no compression I thought the rings went bad but it only had about four days on it It turnes out the alighnment pin for the rings thats pressed in to locate the ring in the proper orientation came out. It damaged the piston head and cylinder.It was a wiesco.. But this is just my opion on wiesco. Some people love them... I only use pro x on bikes and JE Arias Or Ross on cars with the exception of VW's

[79EK1]

You'll need to measure the chamber volumes in the head to accurately calculate the compression ratio. On stock heads, the chamber volumes can vary, so you wouldn't want to build a high CR engine without knowing for sure. Once you know the volumes, you can specify the piston dome volume for the CR you want. You can also have valve reliefs cut into the domes to prevent piston to valve contact.