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I had a 1UZ-FE in my 92 LS400. It was incredibly smooth and refined as a flagship luxury car should have for an engine, but I never thought of it as being a particularly hot motor.
it needed to be just that little bit hotter than the 420SEL and 735i... and we know toyota doesn't really do the whole 'above and beyond' thing unless absolutely necessary haha
What is your obsession with the 8.1? It's not a good engine, it was just a temporary solution and the 6.2 totally replaced it since the 6.2 had a 6 speed allowing better effective pulling and far less drawbacks.
6.2 isn't as robust as the 8.1, it's aluminum.
6.2 will tow fine until the cows come home but the big blocks are serious tow pigs.
I should have also added that the 8.1 is a 25-year-old engine, and an evolution of the 454 introduced in 1970 (itself a descendent of the original 1955 409/427 big block). It was discontinued 15 years ago, so of course it's outperformed by the 6.6L that replaced it, as well as Ford's 7.3L "Godzilla". But though the technology has improved to allow for similar outputs from those somewhat-smaller motors, the basic design goals remained unchanged: Make an engine that is both everyday driveable with low maintenance requirements, while nonetheless being able to easily pull a heavy trailer almost like a diesel when required.
This makes no sense. The 8.1 and 6.2 are totally different engines with totally different applications. The Vortec 8100 has never been available in the half-ton, and the 6.2L has never been available in the 3/4 and 1 ton. So in no universe is one a replacement for the other.
6.0 sorry, I always screw that up since 6.2 is far more common for the brand
6.2 will tow fine until the cows come home but the big blocks are serious tow pigs.
I have towed with both.....the 6.2 in a heavy half ton SUV is better than the 8.1 in a 2500 class suv. The 8.1 just doesn't really impress when you actually use it mostly due to transmission disadvantage
I would 💜 to try the Chevy 8.1. Wonder what it’s like to drive an engine that big?
my E-class effectively has a near 8 litre engine when factoring in the 2.1 litre supercharger, it's a total riot! something tells me this chevy 8.1 isn't nearly as exciting in any way, and that's even assuming it didn't have all that weight to pull around lol
I should have also added that the 8.1 is a 25-year-old engine, and an evolution of the 454 introduced in 1970 (itself a descendent of the original 1955 409/427 big block). It was discontinued 15 years ago, so of course it's outperformed by the 6.6L that replaced it, as well as Ford's 7.3L "Godzilla". But though the technology has improved to allow for similar outputs from those somewhat-smaller motors, the basic design goals remained unchanged: Make an engine that is both everyday driveable with low maintenance requirements, while nonetheless being able to easily pull a heavy trailer almost like a diesel when required.
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Thanks for the update. I read something that it’s based on the old 7.4.
This makes no sense. The 8.1 and 6.2 are totally different engines with totally different applications. The Vortec 8100 has never been available in the half-ton, and the 6.2L has never been available in the 3/4 and 1 ton. So in no universe is one a replacement for the other
my E-class effectively has a near 8 litre engine when factoring in the 2.1 litre supercharger, it's a total riot! something tells me this chevy 8.1 isn't nearly as exciting in any way, and that's even assuming it didn't have all that weight to pull around lol
well obviously not gonna be the same riot. I just would love to try out the Chevy to
See how ridiculous it would be to live with it. Maybe achieve 5MPG
The UZ series will never be able to compete in today's market and even 10 yrs ago. The UZ was built for refinement and linear power and topped out at around 290hp, which was great it for its time. I think its safe to say we all wish there were modern day versions of the UZ, JZ (I think BMW stole it), 4AG and 3S engines, but we dont. Its all about lightness, top power, modularity and maybe long term reliability. Modularity is the biggest downfall of modern engines. If there's a design flaw, it pretty much spreads throughout the entire engine family like a contagious disease and automakers is not in the business of making vaccines for it. Unless it blows up spectacularly like the 3.4tt.
aside from the stupid timing belt, there was less to go wrong with the 4.7. Earlier the 4.7 the better.
Cam seals
Cam caps
Knock sensors
Coolant pipe
Valve cover leak
Vac lines turn to dust
ASIC runner control motor seizes
Air mix paths in the intake carbon up
VVT solenoids
Upper oil pan leak
Exhaust manifold leak/cat failure
All things I've commonly seen on 4.7s, heck I have one here now I just did manifolds and cam seals on. MASSIVELY expensive work but Toyota owners are totally okay with it even if they could have avoided it with more regular oil changes and premium gas.
Also, what URs have you owned? I've owned 2 UZs and two URs so I've actually lived with both and worked on both
Cam seals
Cam caps
Knock sensors
Coolant pipe
Valve cover leak
Vac lines turn to dust
ASIC runner control motor seizes
Air mix paths in the intake carbon up VVT solenoids
Upper oil pan leak
Exhaust manifold leak/cat failure
All things I've commonly seen on 4.7s, heck I have one here now I just did manifolds and cam seals on. MASSIVELY expensive work but Toyota owners are totally okay with it even if they could have avoided it with more regular oil changes and premium gas.
You didn’t know, but the VVT stuff was not on the original 2UZ. Mine doesn’t have it. Too much stuff on the 4.6 to go wrong and it sucked that Toyota never did any updates to the 4.6. Not one on the GX460 in 13 or 14 years
cat failure
my mechanic recently removed one of my cats.
Down to two now.
Last edited by Toys4RJill; Sep 13, 2024 at 10:35 AM.
Man you have some good deals that come across your plate!
I'm good with stuff like this anyway, always getting low prices... But yeah, the cars are crazy how cheap I get them sometimes.
I still can't believe how cheap I got the Mercedes, they could have sold it for double. I've had it practically 2 years and nothing big has gone wrong (just age related stuff like mounts), it's a golden goose creampuff. Runs and drives like it's brand new. He just didn't know what he had. I didn't tell him what he had, but I called every single day while it was waiting on a part for the top and not available yet. Said top has worked flawlessly knock on wood for almost 2 years, and we use it a lot.
The LS430, yeah. Got that 17 grand worth.
The LX I got for $500 over what my friend paid, used my broker buddy for that one. Impossibly cheap we got that for.
