codrus

I'm not sure what the piston-to-wall clearance is, I gave the pistons and block to the machinist and let him worry about it (same machinist Savington uses for his builds, so it's probably whatever Savington usually sets them at). Ring gap is .018 for the top, .020 for the second ring, IIRC.

The pistons have holes near the oil control ring, yes:



--Ian

williams805

iTrader: (2)

Same gaps as mine. My rings are wiseco XX. Is that what you have?

My PtW is .0036", .0037", .0038" and .0039". These were measured on the engine stand and it makes me wonder if on a table they would be a little closer together. One ten thousandth every hole out from the stand. A little loose, but I wouldn't say excessive.

codrus

For rings, I have whatever it is that TSE sells, because that's where I bought them.

Did you bore with a bore plate?

--Ian

psyber_0ptix

iTrader: (4)

This makes me sad. My motor is already in the car, with Supertechs and squirts. But I guess it doesn't matter, I don't have consumption issues because my car doesn't run. I should finish that huh?

williams805

iTrader: (2)

No plate. I didn't find out I could rent one until afterward.

Mazdaspeeder

For what it's worth, I have Weisco low comp pistons, factory squirters, and run Rotella T6. I drive mostly street (sometimes hard) and produce a peak of a bit over 300whp.

The only oil consumption I seemed to have was when my tuner had the car for 3 weeks and was romping on in on the street and the dyno and during that time it needed an extra half quart or so. For when I drive the car, my oil level stays fairly steady (nothing that is concerning) and certainly not as bad as the OP had with his setup.

My motor is not the tightest setup either, so some use is expected. I even asked the tuner what he thought about the oil consumption and he said that for the power the car is producing and how he was driving it, it was totally normal. I had a habit of checking my oil level at work and always panicked about it reading low until I realized our parking lot is not flat.

williams805

iTrader: (2)

Do the wiseco's have the drain back holes in the pistons?

I've made a habit of always parking in the same spot at work. Pretty level by eyeball. However more importantly I alway check it there so I can see if it has actually lost some or not. It really doesn't take much tilt to really throw things off.

Mazdaspeeder

I do not remember off the top of my head, and I don't have photos of the piston bottoms. Yes, level can really mess with the oil level, especially in my lot where the nose is angled down and the back of the pan (dipstick part) gets low for no reason

The pistons did have some holes, IIRC where the oil control rings go.

Chooofoojoo

iTrader: (7)

99% sure wisecos have oil drainback holes on oil control ring lands. My 10.5:1 ones did at least.

Mazdaspeeder

Here are my Weiscos before they went in

williams805

iTrader: (2)

Update: at 2200 miles since removing the squirters, I added one quart. So far oil consumption is roughly cut in half.

I'm thinking that hone and PTW clearance are the contributing factors here. Although not ideal, I can live with 1/2 quart in 1K miles. I may be going on a pretty long road trip in the next few weeks so I'll get to see if consumption goes down with less cold starts in between fills.

Chooofoojoo

iTrader: (7)

Installed and have about 500mi on new engine without squirters. Wiseco 10.5:1, coated skirts, .003" p2w clearance, XX rings.

Have been driving the crap out of motor during break-in and not a lick of oil loss, oil pressure is rock solid, oil temps have been more stable, and about 10 cooler than last motor. Aples to oranges comparing motors, but I am very happy with my choice to remove them for this build.

EO2K

iTrader: (37)

You ***' have me second guessing my choice to leave the squirters in my motor.

18psi

iTrader: (76)

There is never a clear cut answer on this G, don't even stress about it

williams805

iTrader: (2)

Yeah, seriously. I know of two vendors on here who run them in all their engines.

patsmx5

iTrader: (16)

I'd say for sure, stock cast pistons, keep them. The pistons will run cooler, which will help keep them alive.

For Weisco's, I would not run them as they are not needed due to the alloy. They will not get hot enough to ever fail from temperature in normal use since they are much stronger at temp vs other alloys.

patsmx5

iTrader: (16)

Supertechs are not as strong at higher temps than Weisco due to the alloy. So they help keep those pistons alive. I wouldn't run supertechs, but if I did, I'd run the squirters to help keep them cool/happy.

Squirters/no squirters really depends on the piston you are running.

TNTUBA

iTrader: (1)

I wouldn't put Supertech pistons in my lawn mower......just saying.

williams805

iTrader: (2)

Seeing your car... your lawn mower probably has more power than my car.

Chooofoojoo

iTrader: (7)

My Thoughts exactly.