Call me stupid... but I was thinking about this the other day...

Why is the ls1 faster than the lt1?

given the lt1 has a working optispark (do those even exist?)... but come on... bigger displacement... higher c/r.... reverse cooling heads......

why is the output so low compared to the ls1?

 

displacement isnt always everything, especially in cases where it only varies by 4ci. as for the difference. im not sure exactly but lighter motor, and id assume a slightly more performance cam, better flowing heads. the ls1 is faster stock for stock, hands down.

and yes, unfortunately the optispark does very much exist.

 

the heads and a few small other things

 

I stopped reading your post after this

 

more lift? larger duration? I know they have bigger rocker arm ratios.... intake flows better.... but 50 hp?... I need more info damn it...

 

there are alot of small things just technological advances....the 8 coils, less dwell time. Better pcm, the intake is a bit better, I see the heads as the best advantage, not just the flow but the design overall.....stock for stock the ls exaust manifolds are way ahead in flow....The rockers and stuff I don't see the power gain from the ratio, alot of little things that just work better.....Like the knock sensors....they detect less false knock

I'm sure anyone who knows LS motors could go on all day

 

allright... I think that's enough to satisfy me.....

 

now you want one don't you

 

only if its a 511 small block or this one http://www.ls1tech.com/forums/showth...99#post6325899
... other then that... i'll stick to my red headed step child lt1 thank you very much

 

95 is correct. displacement isnt always everything. a lighter c6 z06 runs ~11.7 on the 1/4 and here i am with a stock block 346 running a 11.87 and i can drop off another .4 if i lose the stock tc. some cars on here with 383's would destroy a stock ls7 427.

 

15-degree heads offer a significant advantage over 23-degree heads.

 

There are 4 cylinders in the 9's... whats your point.... does that mean 4 cylinders are better for drag racing, they have a smaller displacement

thanks injuneer

 

Why are you arguing about displacement, or even bringing it up..... you used at as an example on an advantage the LT1 has over the LS1. Do you really think 4 cubic inches makes any difference?

 

EVERYTHING flows better in an LS1, from the intake, through the heads, and out the exhaust. Fred (Injuneer) mentioned the 15° heads vs. 23° heads, which is obviously another advantage. The LS1's ignition system is by far the best factory ignition system to date, providing very high energy spark.

Also factor in that the intake manifold is a composite (plastic) material, compared to the LT1's aluminum intake. The composite doesn't get heat soaked the same, therefore, the LS1 "breaths" cooler air. Another point about the heads that (IMO) probably makes a difference, is the valve layout. Instead of the old SBC arrangement of E-I-I-E-E-I-I-E, the LS1 uses the BBC arrangement of equal spacing, E-I-E-I-E-I-E-I. I think that would make it more "balanced", both from a flow perspective (through the manifolds) and also from a heat perspective (not having that concentrated hot-spot between cylinders 4 & 6 and 3 & 5).

AND, speaking of "balance", the firing order on LS1's was changed from the old 18436572 (<--I think that's what it was? ) to 18724365 (or something like that?! ). This was studied, and they decided it made for smoother idle, and subsequently smoother revving I'm sure. And REV is what LS1's do best!!