Motech Gen V Startup

Lil Nasty

Member
The Gen V 5.3 L83 engine has a lot of promise. With direct injection, high compression and CVVT we hope it will have the mid range torque a heavy JK requires. We are hesitant to recommend the Gen IV 5.3 in a heavy JK because the 6.0 does a much better job hauling the weight. The problem with the Gen IV 6.0 is it is not compliant in California and other areas so you are stuck with a 5.3 or 6.2.

The new 5.3 also runs on regular gas, uses synthetic 0/20 oil and holds 8 quarts of oil. Here Mitch and Joey start a almost new L83 on the stand.

https://www.youtube.com/watch?v=Ymgaey9ktMc&feature=youtu.be

I'd be curious to see the low to mid-range torque numbers compared to the other options available. Aside from availability and CARB compliance, do you foresee a larger cost savings to benefit this swap over the others? A dollar to HP/FtLb ratio between the options would be interesting as well, at least for the "Efficient" (read frugal) among us.

 

Desertman

New member
Hi motech I watch every video you release. My friend builds LS race engines in Texas and he hooked me up with videos you release. One question I have not seen any of your videos showing an LS in a two door? Our desert driving here favours the use of a two door Jeep is an an LS possible?


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MOTECH

New member
I'd be curious to see the low to mid-range torque numbers compared to the other options available. Aside from availability and CARB compliance, do you foresee a larger cost savings to benefit this swap over the others? A dollar to HP/FtLb ratio between the options would be interesting as well, at least for the "Efficient" (read frugal) among us.

The price of the Gen V 5.3's is dropping rapidly, currently they do not cost much more than a Gen IV 5.3. The yards are gouging as usual on the 6.2's, the 6.2 is in high demand and they ask top dollar.

The cost of the 5.3, like the 6.0, is a major factor for the swap. I have been doing engine swaps for over 30 years and back in the day we used mostly SBC's. I like the 90's 5.7L "K" engine. Throttle body injected and very reliable. That 350 SBC put out about 180 HP, a Gen V 5.3 by comparison puts out over 330 HP. The 5.3 has roller cam and lifters, all aluminum construction, direct injection, 4 cylinder mode, variable valve timing and a lot more. You couldn't build that engine in the 90's let alone anywhere near the price of a current 5.3.

Emissions compliance around the nation is being stepped up. So even if you were to get a non compliant swap through now at sometime in the future you may have an issue, especially if you intend to sell your JK. Federal laws as well as local dictate a tampered vehicle cannot be sold. The fact California and other States are relaxing the laws regarding swaps in newer vehicles since they are so popular means they are stepping up enforcement. Monitor and mode 6 data are thoroughly checked now unlike the early days of the Hemi where they were set to not supported. USEPA data is being referenced. . We started support for the Gen V engines primarily to support 14+ JK's that require a newer engine. The Gen IV engines are still an excellent choice for an older JK IMO, I drive one every day and wouldn't trade it out. The Gen V engines do have advanced technology not present in the Gen IV engines; however, after many miles in both I do not feel the difference is enough to not go with a Gen IV. The LS3 and 6.0 Gen IV engines are still a bargain and perform better than any power adder I have driven in a JK.
 

MOTECH

New member
Hi motech I watch every video you release. My friend builds LS race engines in Texas and he hooked me up with videos you release. One question I have not seen any of your videos showing an LS in a two door? Our desert driving here favours the use of a two door Jeep is an an LS possible?


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Yes, about 15% of our swaps are 2 doors. The demand for a heavy expedition 4 doors is where it is at now. A vehicle with enough room to haul your family and gear so they are the bulk of what we do. Almost everything ahead of the center crossmember is the same on the 2 and 4 door. The two concerns in a 2 door is if it has more than a 3" lift the pinion angle can get steep causing a vibration; but this is true even without a swap. Also on the 2 door the exhaust runs in front of the crossmember and under the transmission pan like stock since there is not enough room between the fuel tank and transmission to get the pipe through.

Other than that 2 door LS JK are fun to drive. One of the cleanest JK's we did a swap on is up for sale. It is a 2 door 2011 JKUR in excellent condition, bright red with a TMD hood and all the options - LS3. It is a perfect example of power vs drivablilty. Jerry the owner drove it for about two years and passed away about a month ago; his wife contacted me to put it up for sale. We do not sell JK's here but if anyone is interested it is a great 2 door JK.
 

Lil Nasty

Member
Another off the wall question. Have y'all ever installed a 7.0L LS7? I'm a short fella so I like to imagine bigger is better. I just want to say "seven liter." It sounds so smooth....


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MOTECH

New member
Hi motech I watch every video you release. My friend builds LS race engines in Texas and he hooked me up with videos you release. One question I have not seen any of your videos showing an LS in a two door? Our desert driving here favours the use of a two door Jeep is an an LS possible?


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About 20% of our swaps are 2 doors, other than the exhaust and the fact we have a short rear driveshaft the swap is essentially the same.
 

highoctane

Caught the Bug
Any updates on the Gen V/8 speed? How far out do you guys think you are on the DIY builder's kit for the Gen V?
 

Desertman

New member
About 20% of our swaps are 2 doors, other than the exhaust and the fact we have a short rear driveshaft the swap is essentially the same.

Thanks , I follow all of you you tube videos. I will be upgrading in the near future if I return to Europe as engine swaps are not allowed here in Qatar. Some people change the engine but change back to the original factory engine for the annual inspection. However the cost of this makes it very exclusive.


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MOTECH

New member
These Gen V engines are torque monsters, flat torque curve off idle to redline, amazing.

HbOGNyW.jpg

https://www.youtube.com/watch?v=eP1dRucxrJU&t=1s
https://www.youtube.com/watch?v=h7EW6sBABzk&t=32s
https://www.youtube.com/watch?v=h7EW6sBABzk&t=32s
 

notnalc68

That dude from Mississippi

MOTECH

New member
That 5.3 is pretty impressive, for its size. How are the test runs going with it? I'm a little overdue, catching up on your YouTube channel.


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I'm resistant to change so I held judgement on the Gen V's, the Gen IV's are great so why change? Well same thing happened in 2007, I started dong Gen IV swaps when everyone else was comfortable with the Gen III engines. After a lot of miles I can say these Gen V's are the future, direct injection, CVVT, 8 speed, high compression, regular gas....... You can gear tall and get good mpg and not lose performance.

It's all about cylinder pressure and I say these Gen V's are 1/2 way to a diesel. GM is holding these engines back, we have removes much of the torque management and these engines can compete with most of the crate engines out there, LS and Hemi on regular gas getting good economy.
 

notnalc68

That dude from Mississippi
I'm resistant to change so I held judgement on the Gen V's, the Gen IV's are great so why change? Well same thing happened in 2007, I started dong Gen IV swaps when everyone else was comfortable with the Gen III engines. After a lot of miles I can say these Gen V's are the future, direct injection, CVVT, 8 speed, high compression, regular gas....... You can gear tall and get good mpg and not lose performance.

It's all about cylinder pressure and I say these Gen V's are 1/2 way to a diesel. GM is holding these engines back, we have removes much of the torque management and these engines can compete with most of the crate engines out there, LS and Hemi on regular gas getting good economy.

Good to know. The torque looks impressive, for 323 cubic inches.


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