Is the 5.7L i-Force an LS1?

I came across the 3UR-FE about a week or two ago and I'm currently wondering if the 5.7 is just an LS1. Like how the A90 is with BMW, etc. I do notice similarities between the motor such as compression ratio and the bore x stroke size, but I just want to see if my suspicions are right. I have tried researching this question, but I'm always seeing mixed answers. If you can help me out it would be greatly appreciated.

 

All you have to do is look at the block to know that the engines are completely different.
3UR


LS1


3UR is an overhead cam engine whereas LS1 is a pushrod engine. This makes the block architecture completely different. You can see the LS1 has a cavity above the bores. This cavity is where the lifters and pushrods go.

 

Alright thank you

 

Definitely not a LS1.

 

Fun fact, the 3UR has a longer stroke than a 454

I still have guys at work trying to convince me the Toyota has a Chevy V8. Not worth the argument anymore

 

Doesn’t even come close to looking like an LS1. Being an OH cam engine I think they could rework the computer and fuel system and get some serious HP out of this engine and still have decent fuel economy with performance.

 

Thank you very much

 

This was the main thing that I was confused about. Because I saw people saying it was the block, or how chevy designed it and handed it off which didn't make any sense, but I greatly appreciate you guys

 

Yea I probably should've looked at the block and the cam setup first, but thanks anyway

 

If it was related to a GM motor it would be the 1990-1995 LT5 ZR1 engine. Both are DOHC engines and produce similar HP.
But its not.

 

I'm pretty sure it might possibly be...one!!!

 

Based some evidence I've seen, I was thinking the same thing.

Here is some of that hearsay evidence:


And here is a fun video that talks about the history of the LT5 in the ZR1 C4 Corvette:
https://youtu.be/6Vs2tdR-9C8?feature=shared

 

Yeah… but that’s not a GM engine. That’s a Lotus designed, Mercury Marine built mill.

 

Yamaha,,,,,,,, Japan

LS1,,,,,American


Is not a match

 

The ls1 is basically a cathedral port SBF.

 

According to the video I posted earlier, General Motors LS engines were actually designed as a response to the Lotus built 350 LT5 Corvette engine.

Here is where it is mentioned in the video:


https://youtu.be/6Vs2tdR-9C8?feature=shared&t=908

 

That was amusing end to that video. I enjoyed it thoroughly thank you.

 

Split hairs much?

 

I've never seen that facebook screenshot before, seems outlandish.
The video however is favorite of mine when people ask "how come it took so long for this to happen" because you weren't ready for it the first time.

 

It seems that people still get confused when different engines have the same displacement. The 3UR is obviously not remotely related to a Chevrolet LS1, which is completely different in design. FWIW, at one time GM produced 4 different 5.7 Liter or 350 engines, a Chevrolet , Pontiac, Oldsmobile and Buick V8. Other than displacement, they shared almost nothing else in common.

https://youtu.be/ixbQuTyV7iQ?si=-CpRZ4QGNaN_DA74

That above quote is complete garbage information. Again there is no relation between Toyotas 3UR 5.7 L and the Chevrolet LT5, other than both are 5.7L DOHC V8s.

The LT5 didn't fail because Americans didn't like the high revving engine. It failed because you had to buy the highly expensive Corvette ZR1 to get it. Then Chevrolet increased the power and performance of the base engine with the Gen II LT1 engine, making the ZR1 seem very expensive for not much more performance. It was also costly to manufacture. The LS V8s essentially replaced both the old SBC and the LT5. The Gen III LS engines were smaller, lighter and cheaper and eventually produced more power and performance.

Here is an accurate history on the LT5. It also explains the relationship with Lotus, which GM had an interest in at that time.

https://www.curbsideclassic.com/aut...dohc-v8-a-british-heart-for-an-american-icon/

 

Here is a question from an idiot. (Me)

why are there so many engine designs for the same application? Wouldn’t it make sense that as things are discovered as far as making power efficiently and reliability, wouldnt all designs naturally end up in almost the same place?

For example, all half ton trucks have similar room under the hood, so why at a time would the NA V8 desings from brand to brand differ so radically?

 

Competition, need a compelling product to entice a sale

Fabrication expertise, established manufacturing techniques in a company are more consistent and less expensive

Patents and trade secrets

And the fact it's not an easy task to make an engine and bring it to market

 

LOL, no. Not even remotely close.

 

This is the biggest horsesh1t I've heard, typical patent in US lasts 20yrs, no one in their right mind is going to buy a 19yr old patent, and most likely expired already since if a product is introduced in 1989 it usually means a patent application was filed 2-3 years prior.

costs, supply chain, leadership.

1UZ, aka LS400 was the basis for all Toyota V8, so it makes sense to take that knowledge, expertise, experience to derive from that.

GM V8 derived from their pushrod design because they have "perfected" in a sense, its small, compact, and they've been doing it for 50 years.

Ford likes to try new things, so you get pushrod, SOHC, DOHC, twinturbo, etc, some were good, some aren't.

 

Just to clarify:
• I was agreeing with @Heavy_Guns that if it were related to a Chevy engine, it would be the LT5... BUT IT'S NOT
• The Screenshot is from Quora, not Facebook
• I did purposely label it as "hearsay evidence" in order to bring its credibility into question.
. -I don't believe hardly anything on the internet, but I thought this was some interesting BS related to the topic.
• The curbsideclassic.com article was good, and covered a lot of the same information as the video did... I didn't see the two being in hardly any conflict

 

Oh, not pointing finger at you, just the guy who made the claim.

Reminds me of a story of how someone's grandfather used to post on earlier car forums, the old man would post false statements and watch people argue, until the grandson pointed out to him: "grampa, that's a troll, you are a troll"