What the 4.0 could have been

Car safety features are low on the list. We need Doctor safety features. Fat people safety features. Drug ingestion safety. Etc, first. Go down the list of causes of death and most are poor diet and excercise leading people to doctors who kill hundreds of thousands with medical errors each year. And Fentanyl use.

But I'm sure when they want .gov to go after dangerous car and motorcycle people they'll start with the crazy offroaders sending it on government land.
 
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BlueC said:
The general consensus is you will gain a few %, like 2-3%, in power output per point of compression ratio gained. So a 200 hp engine moving from 8.5 to 9.5 might gain 5hp, nothing significant. You would never notice that. On a 500hp engine, that % change would become more noticeable.

An engine is a system, so if you were to bump the compression and increase the VE, then you start making noticeable power changes.
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I'd rather have the ability to run on 2 year old shitty gas in the hot desert honestly. I'm not in love with needing 91 octane for my 10.2 compression ratio
 
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The 4.0 should have been a 4.6 liter with modern OHV head design. Basically take an LS head and morph it onto our straight six. Add provision for roller lifters and you’re there! 300hp factory and can play the “lineage” card.

Bonus points for aluminum head. Bonus bonus points for cross flow head. Bonus bonus bonus points for aluminum block. But at that point scrap it all and build fresh. The block did need work however to provide cam and crank sensors that do not rely on the bottom half of a distributor. Too much work for a niche vehicle.

Someday I’d like to build a 4.6 stroker, aluminum edelbrock head, high-ish compression and full roller valvetrain (roller lifters and roller rockers) …
 
Ericshere03 said:
The 4.0 should have been a 4.6 liter with modern OHV head design. Basically take an LS head and morph it onto our straight six. Add provision for roller lifters and you’re there! 300hp factory and can play the “lineage” card.

Bonus points for aluminum head. Bonus bonus points for cross flow head. Bonus bonus bonus points for aluminum block. But at that point scrap it all and build fresh. The block did need work however to provide cam and crank sensors that do not rely on the bottom half of a distributor. Too much work for a niche vehicle.

Someday I’d like to build a 4.6 stroker, aluminum edelbrock head, high-ish compression and full roller valvetrain (roller lifters and roller rockers) …
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Like the gm vortex 4200 that came out during the same era as the tj?

https://www.drivingline.com/article...rful-dohc-inline-six-was-almost-americas-2jz/
 
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JustDandee said:
Other than striking a nerve with comments I don’t think the conversation moved much In the direction of original question?-, giving this a bump. Curious as well on what happens moving the compression ratio up- no other changes- even if one had to run one of upper tier octanes- what does it give you?

Had a CJ7 with a 2.5- doing The head gasket I took the head to a local old school machine shop, ask them to true the head and take a little bit more
off . Really informal on the request and no clue- other than it was conservative- but the result was a slightly zippier 4cyl. So I always wondered if one addressed this with purpose, what could be had. It’s not just a matter of peak HP/torque- this would should everywhere in the curve.
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I don't think moving the dynamic compression ratio to 8.0 would require more than 87 octane.

In my opinion this is the biggest problem.

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The red cells are timing adjustments I made. I don't think throttle position has any influence. The RPMs and absolute pressure are the dominant inputs. With the stock timing the ECM reduces power when you need more power to go up a long hill on the interstate.
 
Rickyd said:
My first car was a 66 rambler classic 660. 232 torqueflight. That car drove great. I wish I'd kept it and put a 401 in it

There was a turbo 199 with crazy boost levels run in racing back in the day. Indy500? Daytona?
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Actually, your '66 would have had a Borg Warner M-3x "Flash-O-Matic", and hooked up to a torque-tube. The TorqueFlite 904 didn't appear behind AMC engines until '72, and were called Torque Commands. Just so you know. ;)
 
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mrblaine said:
When you get your license to drive, all you have to do is post a bond large enough to cover your care should you accidentally wind up in a coma at the state's (read mine and yours) expense for a few years.
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Now that's the proverbial slippery slope talk right there. If you do that, then you must also ask owners of swimming pools to post bonds. And ladders. And dirt-bike riders. And off-road only rock-crawlers. Where do you draw the line between personal risk and public medical care? Once you start using that argument to limit personal choices, it's tough to find that line. One man's pursuit of happiness is another man's burden?
 
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sab said:
Now that's the proverbial slippery slope talk right there. If you do that, then you must also ask owners of swimming pools to post bonds. And ladders. And dirt-bike riders. And off-road only rock-crawlers. Where do you draw the line between personal risk and public medical care? Once you start using that argument to limit personal choices, it's tough to find that line. One man's pursuit of happiness is another man's burden?
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I like to remember the time I was in a foreign country and a fellow traveler had a blood clot, he'd have died in the corner of the waiting room if he hadn't handed them a credit card.
 
Longwhitejeep said:
Like the gm vortex 4200 that came put during the same era as the tj?

https://www.drivingline.com/article...rful-dohc-inline-six-was-almost-americas-2jz/
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That was a good one! A little complicated and the vehicles they put that motor in were crap … 4.2 liter, all aluminum, robust straight 6 with all the modern goodies… Imagine if Chevy made a solid axle K5 blazer to compete with the TJ or JK. The 4.2 would have shined. Instead we got that trailblazer ugh, it was a good minivan but that’s about it.

We also gotta remember Jeeps were not the hot ticket they are today, in the 90s they were a fun vehicle. It wasn't till the JK captured the poser and soccer mom crowd that sales exploded.
 
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mrblaine said:
I'm fine with every bit of that. When you get your license to drive, all you have to do is post a bond large enough to cover your care should you accidentally wind up in a coma at the state's (read mine and yours) expense for a few years.
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How would this differ from insurance? Isn't posting a bond/having an escrow an option for the wealthy in lieu of auto insurance in states that require it?
 
Squatch said:
Actually, your '66 would have had a Borg Warner M-3x "Flash-O-Matic", and hooked up to a torque-tube. The TorqueFlite 904 didn't appear behind AMC engines until '72, and were called Torque Commands. Just so you know. ;)
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Gotcha, yeah i remember the flashomatic label.my dad called it a torqueflight during one of the times we replaced it after neutral dropping the poor thing to get it to peel out.

That torque tube with panhard bar and triangulating braces was an interesting design.it sure rode nice
 
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Rickyd said:
Hint- runs on #2

But its a ford so "run" is a controversial word🤫
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That makes more sense. My neighbor has one of those with a 6.7 and it sees more duty as a trash hopper than ass-hauler, but he thinks his yard art looks good. :LOL:
 
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