Leakdown numbers of 10%-12% are generally acceptable for street engines. The best way to test the extent of the seal failure is to do a leakdown test. However, we don’t always recommend this option as replacing the seals is quite expensive and requires a lot of the engine to be taken apart. The only way to resolve the problem is to replace the seals. Rough idling, lack of acceleration, poor performanceīad ring seals is very common on LS1 engines as is piston slap which we will cover later on.When the piston seals wear fuel and oil leaks into the crankcase which is eventually passed back through the intake system via the PCV valve. Ultimately, when the ring seals go bad excess oil will seep into the cylinder causing oil consumption and blow-by. The rings come with very tight ring end gaps from the factory and the additional heat caused by extra horsepower can cause the end gaps to close. While they are sub-par on stock engines, modded LS1’s are a lot more likely to run into these issues. These rings on the LS1 are known to deteriorate quicker than normal.
STOCK PRO CHARGED LT1 FREE
The seals maintain the cylinder compression and also reduce blow-by and help keep the combustion chamber free of oil by scraping and sending the oil back to the crankcase.Įach LS1 piston uses 4 seals, a 1.2mm combustion ring, a 1.5mm seal, and two 2.8mm oil rings. Piston ring seals sit within the piston head and seal together the piston and the cylinder wall.
Availability of LS1 engines and performance parts makes them common candidates for engine swaps into all sorts of cars. The LS1 was also built and used in Australia in Holden vehicles where it reached power levels of up to 400bhp and 405lb-ft of torque.īuilt with an all aluminum block the lightweight nature and strength of the engine make the LS1 a popular engine for performance modification, capable of producing significant power with simple bolt-on modifications. Most prominently used in the Chevy Corvette and Camaro, the LS1 produced 345-350hp and 350-365lb-ft. While the LS1 shares the same displacement, engine sizing, and rod bearings as the LT1 it was otherwise a freshly designed engine. It’s the successor to the 5.7L Gen II LT1 engine which produced up to 305hp and 340lb-ft. The LS1 is part of the “Gen III” small-block V8 engine family which also includes the LS6 as well as the 4.8, 5.3, and 6.0 Vortec engines. I know it's blurry and you can't see much but I figured it can't hurt to post it anyways.The Chevy & GM LS1 engine is a 5.7L small-block V8 engine produced from 1997 until 2004.
STOCK PRO CHARGED LT1 MOD
There isn't anything obvious that I've seen or heard (so far) that would indicate it being a bad car or a bad mod (after the rebuild). Otherwise from the pictures it looks very clean and well maintained. Normally my uncle would help me out but he's across the US right now 🙃 and he told me to get a stock C4 and slap an LS into it. What should have been done to accommodate the procharger and what are some red flags to stay away from it? My question is, what do you guys think about this? I've never owned a car with a procharger on it and I am not sure what to look for/ask for to make sure the engine isn't just gonna blow up on me. In addition other parts were replaced like the optispark and water pump, upgraded break disks and calipers and some other parts. That is what I've got so far and tomorrow I'll be taking a look at it. Apparently it needs a tune because it runs rich but it drives just fine other than that. He drove it that way for 3000 miles but it's now sitting in the garage because he got himself a C6 last month. So he had it rebuilt with Cast Iron pistons and some other things.
They say that the previous owner had put a procharger onto the engine and melted the aluminum pistons. So I was looking around and found one for sale. I've narrowed my search down to a 95 or 96, manual. I'm looking at buying my first Corvette, specifically a C4. It also had other issues with a rough idle once warm, that it "needed a tune" and white smoke coming out of the exhaust. The fluid turned from blue to a teal color. Edit: So I checked out the car, used a block tester on it and the result was that there was a combustion leak into the coolant system.
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