TJ LS1 engine Q&A - Page 2 - JeepForum.com

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post #16 of 23 Old 06-06-2012, 04:43 PM Thread Starter
Staggito
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Quote:
Originally Posted by mhopton View Post
Question for the OP: why are you considering the LS1 when horse power is marginally better than the LM7, but the LM7, being a truck motor, has better torque numbers? The LM7 is much cheaper, from what I've seen.
i forgot to ask. does the LM7 make more torque because of the CAM/CRANK combination vice the LS1?


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post #17 of 23 Old 06-06-2012, 04:46 PM
chmo
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my build ... well ... ahhemm

just ordered the hopefully last part: a engine harness from speartech ... my 11 year old donor harness is most likely brittle at some parts due to the desert heat and dust here.

I will have something like USD 6.5k in parts after selling my "old" 4.0 and my 42RLE with 45k miles on the clock. The parts already include such small things like radiator hoses, exhaust stuff, clamps and TC and transmission cable shifters and intake stuff.

The shop will take another USD 1.5k to put all together.
Appointment with the shop is set for end of July ... and I will start a build thread

"The more I know, the more I realize how much I don't know"

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post #18 of 23 Old 06-06-2012, 04:49 PM
chmo
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Quote:
Originally Posted by Staggito View Post
i forgot to ask. does the LM7 make more torque because of the CAM/CRANK combination vice the LS1?
it has the higher truck intake manifold as well ...

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post #19 of 23 Old 06-06-2012, 06:20 PM
mattamd_xp
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The LM7 cam is exactly the same as the LS1 cam. The higher low-end torque of the truck motor is because the truck intake has longer runners.

99 Wrangler Project Detroit Mongrel 5.3/4l60e/Atlas HPD60/14B coilovers etc...
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post #20 of 23 Old 06-06-2012, 09:23 PM
rckchucker
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Quote:
Originally Posted by chmo View Post

If I were in the US I would go LM7 5.3 ... nearly same aftermarket power add ons and only 60 lbs heavier bc of iron block than LS1 (still 40 lbs lighter than 4.0!)
False. An LM7 is not 40 lbs lighter than a 4.0. I just finished putting a 5.3 in my Jeep. I put a long block 4.0 on a scale and long block LM7 on a scale and the 5.3 was about 160 lbs heavier. My Jeep gained about 150 lbs on the nose. The only thing that changed was the engine. I retained my AX15 and 241 transfer case. I seriously doubt that an L33 aluminum block 5.3 is lighter than a 4.0 as well.
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post #21 of 23 Old 06-06-2012, 09:31 PM
droz
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Quote:
Originally Posted by rckchucker View Post
False. An LM7 is not 40 lbs lighter than a 4.0. I just finished putting a 5.3 in my Jeep. I put a long block 4.0 on a scale and long block LM7 on a scale and the 5.3 was about 160 lbs heavier. My Jeep gained about 150 lbs on the nose. The only thing that changed was the engine. I retained my AX15 and 241 transfer case. I seriously doubt that an L33 aluminum block 5.3 is lighter than a 4.0 as well.
not sure how accurate these weights are as I've never weighed either the 4.0 in my jeep or the LS1 from my car but according to novak site for XJ (been considering the 5.3 or LS1 swap for my jeep down the road) these are the weights they listed

You'll be replacing one of three factory engines. Their nominal estimated, accessory loaded weights are:

•2.5L I4, 340 lbs.
•4.0L I6, 515 lbs.

Engines you may replace these with may include:
•Chevy Small Block V8 (Gen. I & II), 550 lbs.
•GM Small Block V8 (Gen. III), 525 lbs.
•GM Small Block V8 (LS1), 407 lbs.
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post #22 of 23 Old 06-06-2012, 11:06 PM
clintrivera
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Quote:
Originally Posted by rckchucker View Post
False. An LM7 is not 40 lbs lighter than a 4.0. I just finished putting a 5.3 in my Jeep. I put a long block 4.0 on a scale and long block LM7 on a scale and the 5.3 was about 160 lbs heavier. My Jeep gained about 150 lbs on the nose. The only thing that changed was the engine. I retained my AX15 and 241 transfer case. I seriously doubt that an L33 aluminum block 5.3 is lighter than a 4.0 as well.
That doesn't make a lot of sense to me. An L33 Has an aluminum block, heads, and oil pan. Plastic intake manifold. Overall, not a really big engine.

The 4.0 has an iron block, head, steel oil pan, and a metal intake manifold.

I don't see how the L33 wouldn't be lighter?


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post #23 of 23 Old 06-06-2012, 11:30 PM
chaserLJ
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engine help , engine swap , motor replacement , motor swap

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