Re: Secondchance - 380 build begins!
 

Oh yes, you are right. They are cast iron.
Nevertheless, my engine consume up to 1 quart of oil each 650 miles in spite of all new parts (pistons, liners, rings, valve steam seals etc.). It was correctly broken in and I run it with semi-synthetic Mobil oil 10W-40.

It's not as the consumption would disturb me much because the engine really pull strong and run on german highways a topspeed of +200 miles. I am just curious to know what experiences about oil consumption other cast iron sleeves LT5 owners did.

Sam

Re: Secondchance - 380 build begins!
 

Are you actually burning oil? Bluish smoke and smell out the tail pipes? Or are you blowing oil through the PCV system?1 quart every 650 miles is a bit excessive. Even with 140,000 miles I was losing may be a quart every 1,000 or so.

Re: Secondchance - 380 build begins!
 

Not at all.

My car only smoke a bit black when accelerate fast. While my engine was stock it also didn't use much oil with about 100'000 miles on the clock.

I think engines with iron sleeves like to take a bit oil. I spoke with some C6 Z06 owners and they told me their engines also take about 1/2 till 1 quart of all each 650 Miles.

Re: Secondchance - 380 build begins!
 

Did you stay w/ 3.9" pistons or go with 4" liners and pistons? L.A. sleeve liners? Which brand pistons?

Re: Secondchance - 380 build begins!
 

4.030 JE Pistons and LA sleeves

Sam

Re: Secondchance - 380 build begins!
 

Once my car is completed I will share my result from oil consumption perspective. In general, if you are not burning nor leaking oil and yet see oil consumption suspicion is being blown out through the PCV system. Perhaps one of the LT5 gurus will chime in.

Re: Secondchance - 380 build begins!
 

HELLO YUN,
Did you do a complete compression check before you pulled apart .
Thanks,
Nelson

Re: Secondchance - 380 build begins!
 

Sam,

Look for a thread here where one of the members had oil consumption issues that were significantly improved w a more accurate tune/calibration. You mention black smoke when getting "on it". Too rich, maybe washing the oil off the liners?

Re: Secondchance - 380 build begins!
 

The smoke is not exzessive and only happen brefly when accelerating hard. And the fuel milage is also fine.
The compression on all cylinders is also absolutely equal. It would be really interesting to share with other owners their oil consumption experiences.

Sam

Re: Secondchance - 380 build begins!
 

My bottom end is stock, so Nikasil liners. Motor has about 50k on it with ported top end and cams done. I drove to BG and back last weekend which covered about 1100mi. I'm down a quart. I use Castrol 15W-40 Diesel.