Im building my 83mm B18 with Arias pistons. I've installed two and Im worried about the piston movement withing the sleeves. Can you see from the video if this amount of movement looks ok? The guy that machined the block says he used the clearance guide that came with the pistons. He had the pistons with him to match each sleeve. Thoughts?

Thanks

http://s396.photobucket.com/albums/p...Picture061.flv

 

i would put 25 to 35 clearance.

 

Mine are at 0.003 and are solid as a rock, thats looks like 0.3 .... I wouldn't chance it myself.

 

"Solid as a rock" in a good way? Are you saying it doesn't have enough movement? Do the pistons really expand much?

 

you need more clearnace. depending on if they are high or low silicone they could expand alot. i would change the clearance. .3 is just wrong.

 

did you check your clearance with a gauge.? the video doesnt look to bad but..

 

Im trying to check clearance but its hard to get accurate numbers with the tools I have. I'll find some other gauges. Arias says it should it be .0040. Anyone else runing tighter like the .0025-.0035 mentioned above? Ill be running about 500whp

 

looks about normal...i have seen many forged pistons rock back and fourth in the bore at TDC.

just ask your machinist exactly how much clearance they have....it should be at least what the piston manufacture recommends.

 

Didnt you say in your first post that you do .25 to .35?

 

Thanks. I'll double check with him. Hopefully he'll remember....

 

yes i did. i meant .0003 has you said seems tight. sorry

 

My 84mm arias measured 3.3028 about .25 inch from the bottom of the skirt. The top of the piston measured at 3.2678. That is a .035 difference in the piston itself.....which would make a .0040 clearance at the bottom look more like a .040 at the top (.02 all around).

 

If I recall correctly, Honda recommends (on a D-series, not sure if its the same for anything else) 0.0004 - 0.0016 P2W Clearance. Like I said previously, mine are at 0.003 but I told my engine builder I was shooting for around 300-350whp.

As in "solid as a rock", I meant they have absolutely no movement in them. I can't say for sure that yours are too loose, but in my opinion, it doesn't look right.

Good luck!

 

This is interesting. Arias says the 84s should be 3.307 and yours are less. I'm finding the same thing. Im mm, Arias says mine should be 83.01 and they are about 82.82 and my sleeve bore is at 82.93. .1mm = .004" right? So it seems my machine shop did it correctly?

 

Thanks. Are you running Arias brand or something else?

Im not sure if Ds are different than Bs. I know Honda's recommendations no longer matter when youre dealing with an aftermarket piston. All I know is Arias recommends .0040. I called them and they told me since Ill be running 25-30psi I can go another half thousands more. So maybe .003 works for 300whp and .0045 works for 500whp? Makes sense I guess. At least I hope

 

Those pistons are low silicone and should be run up around .0035-.0045 depending on your build. The rocking is normal and happens with every piston because there tapered, so don't listen to retards who think they can judge clearance by the vid.

Slap it together and run it!!!! If you really distrust your machinest then you'll have to take the slugs out and bring everything to another shop to be measured.

What sleeves are you running? They look like they were chizzled in with woodworking tools.

 

Does low silicone mean more expansion? I'm sure it's impossible to judge clearances by the vid, Im just unsure of the movement. This is my first build and I didnt know they expand. I like the slap it together attitude! I think that's what Im going to do. The guy helping me with the build trusts the machine shop so Im just going to go for it.

The sleeves are a long story. To be honest I dont know what kind they are. I think LA sleeves with some sort of welded in block guard crap. They are ghetto but they lasted for 15,000 miles at 430whp. That's why im building it on my own this time! I paid a shop for golden eagle sleeves and got this crap ALONG WITH a different turbo than I bought. Big time B.S.!! The block cleaned up nicely though. Here are before and after shots. Im going to start a build thread later today.

 

Yeah, except it turned purple!?!?!

 

Correct which is why I use .0035 to .0045 vs .0025 to .0035


Oh, nice color!!! hahaha sorry had to.

 

Keep it loose and it'll run forever. .0045 is recommended for higher hp levels

 

Thanks for the info. Yup! Purple it is. My car is going to be called either:

The Purple People Eater or
The Flying Grape

Thoughts?

Here's my ride:

 

super clean look. repaint that block so not to ruin it.

 

Looks like normal amount of play to me from the video. there should definatly be movement as your using low silicon content pistons which means more expansion at higher power levels. depending on power level is where you want to be for actual measurement but a good rule of thumb is .0035 to .0045 the lower being for 400-600whp and the higher being for 600+ IMO

 

That's a sweet looking ride!

 

agreed on power to clearance.

wonder if he's taken it off any sweet jumps???