Moving the engine back behind the front axle.

[Cummins12V98]

I am curious why the 5 speed instead of a 6 speed from say a HO 2002 ?

 

[Charlie Lawhon]

I am curious why the 5 speed instead of a 6 speed from say a HO 2002 ?

Almost everything so far has been a generous donation just to see how far I can take a build with what we have to work with.

 

[Cummins12V98]

Understood! So it’s a PIZZ with the pecker ya got project.

 

[Charlie Lawhon]

Understood! So it’s a PIZZ with the pecker ya got project.

Sort of. That was what got it started and we're going that direction but at some point that has to stop. I plan to test bed an all wheel drive center unit my engineers and I are hashing out.

Another thread gave me the indication there could be a market for it if priced right and could just bolt in replaced a transfer case

 

[Wayne M.]

Thinking about your driveline arrangement, the prop shaft sizes/ speeds and critical mass, I think maybe you need the right ring and pinion. Have you thought about using quick change axles? They can be gotten for a good price through the right sources. A narrow case version will tuck right in next to the engine very nicely. You’ll be able to dial in the ratio you need to control shaft speeds.

 

[Charlie Lawhon]

Thinking about your driveline arrangement, the prop shaft sizes/ speeds and critical mass, I think maybe you need the right ring and pinion. Have you thought about using quick change axles? They can be gotten for a good price through the right sources. A narrow case version will tuck right in next to the engine very nicely. You’ll be able to dial in the ratio you need to control shaft speeds.

The plan is to use a torsional differential as the power divider. Rather than a ring and pinion we can alter the power split in 2 ways. The transfer gearing between the transmission and front output is the primary set to change to get the vehicle to steer correctly at highway speed with power applied as an all wheel drive is indented to operate. The second is in the the angle of the helical gears of the torsional differential that ultimately limits the offset in revolutions each output can vary from each other during a slip to insure there is slip where slip is needed but power is transferred to a tire with traction at all times.

 

[Wayne M.]

I’ve never heard of a differential like this. Have a link? I’m a sponge to learn!

 

[Timd32]

Saw this and thought of this thread.

https://frontstreet.media/2020/02/28/the-secrets-of-the-3200-horsepower-executioner-diesel-engine/

 

[Charlie Lawhon]

I’ve never heard of a differential like this. Have a link? I’m a sponge to learn!

I meant to include some pictures of the differential. Here is what I have.

 

[Charlie Lawhon]

That is incredible!

 

[Wayne M.]

Thanks, Charlie. That’s what I know as a Torsen diff. What I was suggesting is a “quick change” axle assembly that offers an large choice of ratios in order to reduce drive line speeds, which I think could be an issue for you. This Diff can be used in an axle like im suggesting. The race car parts market is flooded with axles like this.
Example-
https://www.speedwaymotors.com/Wint...-56-Inch-Quickchange-Rear-End-Plain,5062.html

Here’s a chart with the ratios possible in this axle.

 

[Charlie Lawhon]

Thanks, Charlie. That’s what I know as a Torsen diff. What I was suggesting is a “quick change” axle assembly that offers an large choice of ratios in order to reduce drive line speeds, which I think could be an issue for you. This Diff can be used in an axle like im suggesting. The race car parts market is flooded with axles like this.
Example-
https://www.speedwaymotors.com/Wint...-56-Inch-Quickchange-Rear-End-Plain,5062.html

Here’s a chart with the ratios possible in this axle.

View attachment 118985

We must be telepathic or something. I was just looking at gearing. I have run quick change before in several sizes. I just found a good deal on the hellcat 2.62 chunk. This truck won't be able to pull a trailer and I want to see 1st gear not be a waste of gearbox space. I can buy the hellcat chunks for less than a ring and pinion. If they break... hard lesson learned. My theory is that if you have to dump the clutch and power shift you don't have enough engine for your own taste. I like to drive normal and do what I intend to do. Without surge loading I think the factory unit will work ok

 

[Charlie Lawhon]

That last post said.... this becomes a stall period in the build where choices have to be made that are a long thought process. I'm ready to go feel this thing out but an impulse build leads to a piece of junk which in turn leads to a sale and starting all over.

 

[Charlie Lawhon]

Hang tight guys! This isn't a hoax post and I have built enough to know what I'm facing. I needed to get where I am to physically see how it lays out to move forward.

Btw I set the front unit I have in the rear with the axles and hubs.... man those constant velocities are pretty sexy in the rear.

Frame needs to get narrowed most likely front and rear. I like long suspension arms even with a few inches of travel.

Right now the frame is flexing with the engine weight not centered over the front suspension so that means I have to cage the entire thing. That in turn means more planning to keep all the neighbor parts happy. Not a huge deal but this is definently not a shade tree build at this point.

 

[Charlie Lawhon]

So I got some really good news today! Looks like I'm getting a full rear drive and suspension assembly out of a hell cat. That will be an extremely simple drop in almost plug and play rear half. I'm also getting a second matching 2.62 gear set differential and axles for the front end.

That will get it knocked down to just making knuckles and suspension for the front and building the center diff as the last of the major design and building portion.

 

[Charlie Lawhon]

 

[Charlie Lawhon]

Bored waiting on parts so I threw the Chevy IFS in the rear to eyeball. Also blocked the frame to the 6 inch ride height.

This part is so slow. I hate the waiting.

 

[Charlie Lawhon]

Thanks, Charlie. That’s what I know as a Torsen diff. What I was suggesting is a “quick change” axle assembly that offers an large choice of ratios in order to reduce drive line speeds, which I think could be an issue for you. This Diff can be used in an axle like im suggesting. The race car parts market is flooded with axles like this.
Example-
https://www.speedwaymotors.com/Wint...-56-Inch-Quickchange-Rear-End-Plain,5062.html

Here’s a chart with the ratios possible in this axle.

View attachment 118985

I would like to see the bottom of that list. The ratios kept getting taller and taller. I'm ordering 2.62 for this particular build. It is being purpose built to be a Corvette killer, not pull trailers or haul cargo. 2.62 is the highest I've been able to find

 

[Joe Mc]

Subscribed to this crazy cool build!

 

[Charlie Lawhon]

Subscribed to this crazy cool build!

It's slow going right now. Had to wait on the initial stages of the patent and now with the virus thing I'm at a stand still.

No worries though. My engineering team is waiting on me to get the prints drawn up for the transfer case and we will move on forward soon enough.

This stuff never moves as fast as it should but it always gets done somehow.