Why is the ls1 more efficient?
11-19-2008, 08:34 PM
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Car: 85 camaro z28
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Why is the ls1 more efficient?
Why is the ls1 more efficient?
How come the ls1 is more efficient then the sbc, and why does it get so much better gas milage? Is it because air flows better or location of injectors?
How come the ls1 is more efficient then the sbc, and why does it get so much better gas milage? Is it because air flows better or location of injectors?
Last edited by five7kid; 11-19-2008 at 10:43 PM.
11-19-2008, 09:31 PM
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Car: 1991 Z28 1LE
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Re: Way is the ls1 more efficient?
its like comparing apples to oranges, better airflow, different borexstroke combo, different materials....too much to get into. bottom line is although i adore SBC i will be first to tell you GEN III motors are 10x better.....
11-19-2008, 09:49 PM
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Car: 1984 LG4 Camaro
Engine: 350 Roller Motor
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Re: Way is the ls1 more efficient?
A few reasons:
The cathedral port heads give great flow without losing much low end.
The 6 bolt bottom end holds the engine together at high rpms.
The intake manifold allows both low and high rpm operation.
Optimal bore/stroke ratio.
The cathedral port heads give great flow without losing much low end.
The 6 bolt bottom end holds the engine together at high rpms.
The intake manifold allows both low and high rpm operation.
Optimal bore/stroke ratio.
11-19-2008, 11:44 PM
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Car: 1988 GTA
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Re: Why is the ls1 more efficient?
Sequential fire injection is arguably more efficient too, as opposed to TPI batch fire.
11-20-2008, 12:02 AM
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Car: 1991 RS Camaro
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Re: Why is the ls1 more efficient?
I'm just theorizing but the aluminum rather than cast seems like it would allow higher compression for the same fuel.
11-20-2008, 05:38 PM
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Re: Why is the ls1 more efficient?
aluminum heads yes, block im not so sure about since they have a sleeve.
11-20-2008, 05:56 PM
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Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Re: Why is the ls1 more efficient?
Most important item....they are 18 degree heads. (valve angle)
That makes for better flow.
That makes for better flow.
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11-21-2008, 02:31 PM
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Car: 1984 LG4 Camaro
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Axle/Gears: Strange 12 bolt 3.42
Re: Why is the ls1 more efficient?
The cathedral port shapes are the other...
They work synergistically to allow good low end flow with the top end normally associated with very large cc heads.
11-21-2008, 02:55 PM
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Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Re: Why is the ls1 more efficient?
Have you noticed lately how many times they have changed the port shape?
11-22-2008, 04:32 PM
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Re: Why is the ls1 more efficient?
As mentioned by the last few posts, the cylinder head design is 95% of the differences.
Nice question, i have often wanted to ask that myself, just was too shy. 
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