Always stick to the basics, no short cuts....!!!!! - Page 4 - ZR-1 Net Registry Forums

Flyman 27 · 03-31-2018

Quote:

Originally Posted by A26B

Glen,
My apology if you already are aware of this;
The LT5 is notorious for slow oil drain-back to the oil pan from the top end after shutdown.

I noticed that you mentioned "just topped the oil up". If you did this based on the dipstick reading after turning the engine off, it is highly probable that you have overfilled. The best time to check oil level in an LT5 is the first cold start of the day.

Thanks for sharing this Jerry, I had never heard that before.
Good to know.

ghlkal · 03-31-2018

Quote:

Originally Posted by XfireZ51

Jesus was prescient and was actually prognosticating about working on the LT5 when he uttered these words.

No doubt!

Quote:

Originally Posted by Ccmano

I even recall thinking that the IH gaskets could be a possibility. I dismissed the thought because I saw no sepage into the valley and frankly I had never heard of such a thing on our engines.

I would have never suspected this.

Have others heard of this?

WARP TEN · 04-02-2018

Quote:

Originally Posted by A26B

Glen,
My apology if you already are aware of this;
The LT5 is notorious for slow oil drain-back to the oil pan from the top end after shutdown.

I noticed that you mentioned "just topped the oil up". If you did this based on the dipstick reading after turning the engine off, it is highly probable that you have overfilled. The best time to check oil level in an LT5 is the first cold start of the day.

Absolutely correct, Jerry. I learned this the hard way when first bought my '93 ZR-1 in 1994 and drove it home to Chicago from the east coast. On my first gas stop I checked the oil and it was more than a quart down! I was really worried so I added a quart and a half. Didn't discover the error of my ways until I was home and read some articles about it in the old Registry newsletters. Fortunately it must have just burned off on the rest of the trip because I never had a problem after that.

And I have had a big adjustment with my 2016 Z06. If one checks the oil in the morning before the first run--my ZR-1 habit of 20 years--it will show empty--no oil on the dipstick. The procedure for the newer dry sump Corvettes is to get the engine to operating temp (at least 175 degrees), turn the engine off, wait for between 5 and 10 minutes, THEN check it. Same old story as with the ZR-1s--few people actually know this, including some GM techs. When I attended the Spring Mountain Ron Fellows Corvette HPDE school, in my group of 12 drivers 10 did not know the procedure on how to check the oil on their cars. Scary.--Bob

Ccmano · 04-09-2018

Old engine is out and now for some cleaning, porting, powder coating and a secondary delete. It’s a shame the old engine didn’t get to run its course. Especially considering the great compression and oil pressure given its mileage. I really wanted to see how many miles it would go.
H

04-09-2018	#34
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Re: Always stick to the basics, no short cuts....!!!!! Old engine is out and now for some cleaning, porting, powder coating and a secondary delete. It’s a shame the old engine didn’t get to run its course. Especially considering the great compression and oil pressure given its mileage. I really wanted to see how many miles it would go. H __________________ 90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold.