03EBZ06

Just took out a 3,800 mile LS2 due to severe oil consumption. Put the engine in my sig in. Now, after 600 miles, 1.5qts already.

Upon inspection, the engine looked good before installation. Does anyone have an idea what the static compression ratio should be for this setup?
The heads are 61cc, 0.042 gaskets (or close), cam in sig.

LSmonster

iTrader: (2)

You are close to 12.5:1 with a 4.100" bore head gasket and a zero deck.

MrDrezzUp

iTrader: (1)

Same issue as me. :-(

We should get together and see who can burn the most oil in the shortest distance?

I too have a high-comp 416. I am working my through the engine to try and figure out exactly what the issue is.

Pics
http://picasaweb.google.com/jackson....GoAgainRound4#

Do you consume oil primarily when the car is driven hard or at all times?

LS6427

iTrader: (2)

Whats the fluid pooled in the cylinders?

Looks like bad valve seals were on that engine in the pics.

.

MrDrezzUp

iTrader: (1)

Coolant in the bores.

I have replaced those valve seals, (well entire heads actually) and am in the process of putting the top end back together.

If the issue was valve seals I would be ecstatic. ;-)

Anything in particular that made you question the previous valve seals?

03EBZ06

Mine seems to use it whether its driven hard or not. So far, 600 miles really not driven hard, never WOT yet. I had a 302 FORD one time that burned about a qt until it hit 1000 miles, then it stopped using. I'll give it a little more time to break in before I write it off. I'm going to try running it hard a few times to heat it up. It may need a little push to break in.

I don't have problem with consumption if its small, but I'm concerned about power loss from it too. I'm guessing the high compression cause a back pressure past the rings pushing oil through the other side in to the intake.

more info tommorrow.

Pauls416Z

1) What oil are you using???
2) Exhaust color at idle, under load, oil all over the inside of your exhaust pipes or are they dry?
3) What does your engine builder say and what rings are you using?

(edited to add) Your last post jumped in before I posted....I would add you might want to install a catch can to keep all that oil from going into the intake, if that is what's happening.

03EBZ06

VR1 10-30. It never blows smoke out the exhaust and I haven't seen it spit any drops out the exhaust like my last engine. The tips have carbon on them, but they are not wet. Your notes on the catch can may prove useful. We put a catch can on the last engine, then found a dry catch can with an intake full of oil. Hence, severe blow by.

I guess I better take the intake pipe off and check it for oil from the valve cover. I hope thats all it is. I have a feeling the high compression is hard on the break in.

BTW, bringing it to the shop tommorrow. We haven't really discussed the issue in that much detail or than I noticed a bit of usage already which I thought was not normal. I'll ask which rings were used.

03EBZ06

I guess I should ask if anyone has an engine that doesn't use oil and which rings were used, maybe how were the cylinders honed, break in prococedure, oil used?

Pauls416Z

Here's my info:

No oil consumption issues:
416ci
11.7:1 CR
break-in oil Castrol 10w40 (non-synthetic)
Pistons: Wiseco Forged 4.070" -3 cc L92 VP's
Rings: Childs & Albert Dura Moly
Catch Can
Idle Oil Pressure: 42psi
Oil Pump: Melling 10295 HP/ported

405HP_Z06

iTrader: (11)

03EBZ06

that reminds me 28psi oil pressure at idle. seems low to me.

1.8t

What is your idel rpm? As for the consumption....prior to me breaking my TC, my LS3 consumed almost NO oil at all. Even with the cam and all the power, she ran sooo cleanly. I was amazed.

jay_lt4

iTrader: (4)

no oil usage on my 415ci, used standard 5w30 at startup for about 30-40 min at varying rpm, then drained and running Castrol syntec 10w30, 3500 miles so far, running great. i thought i might get a little usage because i had the rings set up for a small shot of nitrous someday, but all is good.

03EBZ06

925rpm. sounds like a good build.

1.8t

Oil pressure is way too low for that rpm. Did you pinch or cut the O-ring on the pick up/to pump tube?

03EBZ06

I didn't put the pump on, but that will obviously have to be explored. I fail to believe a new engine has crappy oil pressure like this. I believe it has my ls6 pump on it though. I wonder if thats a problem.

Pauls416Z

That would be a problem for me....I'm too freakin particular to reuse something as important and as difficult to get to as an oil pump...


Let me give you this life lesson I learned years ago from my grandfather....

"If it costs more to install the part, than the part itself......you better replace it when you get the chance."

It's also called "WHILE YOU'RE IN THERE" thinking...... when you replace a clutch you always replace the pilot bearing and throwout bearing(slave cylinder on Vettes) and you make darn sure that rear engine cover and rear seal are not leaking and if there are a lot of miles on that rear seal you go ahead and replace it - while you're in there.

Slowhawk

iTrader: (12)

Had the same problem on a customers 416 we did. Ended up that the cylinders were not perfectly round.Would use alot of oil but not smoke at all.

Sent the shortblock to Shawn at Virginia Speed and he verified the problem,rebuilt it correctly and now the motor doesn't use a drop of oil.

I'll keep who built the shortblock the first time, but we'll never buy another shortblock from them again.

03EBZ06

And that is exactly what concerns me, the cylinder machine work.
How does a cylinder get out of round when using a torque plate? Any machinist on this site? Also, phone# please for the engine shop that knows how to machine an LSX block.

I'm having the engine inspected right now, plugs, compression/leak down,oil changed, dyno tune. I should have it back by tommorrow night with some type of overall results and I HOPE to run it by this weekend.

On a positive note, it actually feels way stronger than my 509rwhp 402 so maybe some redeeming qualities about the engine. Do you think an engine, say like you mentioned with out of round cylinders could burn oil, but still make a good ring seal? Doesn't seem like it would be possible.