hp from LS2 vs. LS6 blocks
hp from LS2 vs. LS6 blocks For a complete buildup from a block what would the hp difference between the LS2 block and LS6 block? I'd be using the same crank and similar comparison. What is the difference in hp with the difference in bore?
LS2 is a 4.0" bore compared to a 3.9" bore LS6. I would worry more about the heads and cam selection then the block to determine hp. There are to many factors to give a set number.
Yet again, depends on too many variables. If you have a 3.622" stroke for the test, it yields 347 ci for the 3.905" bore and 370 ci for the 4.030" bore. That is a difference of roughly 23 ci. With a 4" stroke, the results equal 383 ci for the 3.905" bore and 408 ci for the 4.030" bore. That is a difference of roughly 25 ci. For a wild comparison of exponential growth with change to stroke and displacement (area) lets use an 8" stroke. For the 3.905" bore, it yields, 767 ci and 816 ci for the 4.030" bore. This is a difference of 49 ci.
Also, using different heads on different bores yield different flow numbers as well. This is due primarily to shrouding of the valves due to a tight fit with large valve heads on a small bore block.
Why don't you break it down and tell us the setup or is this just hypothetical? If thats the case, 14.53384903 hp
Also, using different heads on different bores yield different flow numbers as well. This is due primarily to shrouding of the valves due to a tight fit with large valve heads on a small bore block.
Why don't you break it down and tell us the setup or is this just hypothetical? If thats the case, 14.53384903 hp
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A 4.00 bore is obviously better but I have easy access to a Ls6 block. I'm debating if the Ls2 is worth the hassle of selling the old block and buying a new one. I'm using a 3.622 crank which be a 23 ci difference. If the gain is around 10-14hp its just not worth the hassle.
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FYI ... A Stock LS6 produces 1.17 HP per cubic inch and a Stock LS2 produces 1.10 HP per cubic inch ... but these numbers can vary by as much as 15-20 HP depending on the particular car..so go figure.
Last edited by slt200mph; Aug 10, 2010 at 07:43 PM.
You should get another 20-25 hp everything being the same...which as has already been stated...seldom is. I would go with the ls6 block if that is a lot cheaper. If not go with the ls2 and make some more power. You wider head selection with the larger bore. You can go with the ls3 heads for example.
how about this. Just for fun please enlighten us with the wildazz sicentific fornula that you used to calculate this mythicial horse power gain of 12...block are blocks they make HP/TQ with the heads and rotating assembly and induction that you use...the block is just the house that they live in and on..the only edge that the LS2 has is the 18 cubic inches of displacement it has over the LS6 ... my particular combination of parts makes 1.31 HP per cubic inch .. so if you used my engine as a referrence point that would make a difference of 23.58 HP...but that is bullshit...that is just my particular engine...they are not all the same...just look at the difference in the HP out put of stock LS1 engines...I have seen as much as 20 HP difference in completely stock engines .... they are not all created equal ... so it comes down to the configuration of the particular engine...there is no formula to calculate what a block will produce ... that is the reason that we strap them on a dyno when all is said and donw to see what we produced...nuff said ...
FYI ... A Stock LS6 produces 1.17 HP per cubic inch and a Stock LS2 produces 1.10 HP per cubic inch ... but these numbers can vary by as much as 15-20 HP depending on the particular car..so go figure.
FYI ... A Stock LS6 produces 1.17 HP per cubic inch and a Stock LS2 produces 1.10 HP per cubic inch ... but these numbers can vary by as much as 15-20 HP depending on the particular car..so go figure.
like was previously said, too many variables; therefore, I like to assume all other variables are constant, makes guessing easier.
what other questions you have for me genius?
well, i thought the ci diff was about 12, but looks like i was wrong. so , i just assume 1 hp/ci (should be a little higher) for n/a typical street cams your going to buy from a sponsor here.. 12-20 hp depending on the assumption. again depends on how agressive the valvetrain is. Gets you in the ballpark.
like was previously said, too many variables; therefore, I like to assume all other variables are constant, makes guessing easier.
what other questions you have for me genius?
like was previously said, too many variables; therefore, I like to assume all other variables are constant, makes guessing easier.
what other questions you have for me genius?
Why would anyone ask you a queston sence you have proven that you obviously are not qualified to answer one..:
You know whats is funny when people come in here and try to be stealth about your build. Really this is a place where people come to ask for help and no one is on a ***** size envy trend. Let us know what your build is going to consist of, what cam are you looking to get, what heads, valves, springs. What stage of head work are you planning on getting. What are you doing with this engine track only, DD, weekend duty. What intake are you going to use FAST, stock, 76MM or up to 102 MM. What type of rockers are you suing and is that going to help your valve train geometry to maximize your valve train ability to extract as much hp as you can from your build. What lobes are you planning to use on your cam XFI, EPS or anything in between. Are you looking for under the curve hp or are you planning on running this thing mostly between 4K rpm to 7K rpm. Are you planning to go with any type of FI and will that FI be helpful in your final use for this engine....
I can go on and on but really spill the beans or go play with the foreign car kids who's cars for some reason all seem to be stock.
I can go on and on but really spill the beans or go play with the foreign car kids who's cars for some reason all seem to be stock.
I honestly don't know what I'm going with the other parts. I'm not "stealth", I'm a newbie haven't figured out my valvetrain. I'm just wondering if its worth the hassle to get a bigger block to start out with.
I look at it this way, you can take the LS2 block out to a 4xxCI without having to resleeve and whatnot like you would with an LS1/6 block. Also, the bigger bore allows use of the now very popular L92/LS3 head. There are plenty of people more qualified than I to tell you why which is best, but these 2 facts alone would sway me into the
In short, LS2 > LS6.
PS- I think VA speed has taken an LS2 block to well over 1500hp multiple times, dont know the limits of the LS6. just throwing that random fact out there.
In short, LS2 > LS6.
PS- I think VA speed has taken an LS2 block to well over 1500hp multiple times, dont know the limits of the LS6. just throwing that random fact out there.
I look at it this way, you can take the LS2 block out to a 4xxCI without having to resleeve and whatnot like you would with an LS1/6 block. Also, the bigger bore allows use of the now very popular L92/LS3 head. There are plenty of people more qualified than I to tell you why which is best, but these 2 facts alone would sway me into the
In short, LS2 > LS6.
PS- I think VA speed has taken an LS2 block to well over 1500hp multiple times, dont know the limits of the LS6. just throwing that random fact out there.
In short, LS2 > LS6.
PS- I think VA speed has taken an LS2 block to well over 1500hp multiple times, dont know the limits of the LS6. just throwing that random fact out there.
qualification Any answer other than that is uncalled for.
- What block do you currently have?
- What vehicle is this in?
- What is the ultimate goal for this vehicle (street, street-strip, race)?
- What is your budget?
- Power/or ET goals?
There are a lot of people in the forum who have been there, done that. Most of the people here are prepared to give you some sound advice, if we can get away from the debate over HP per 18 cubic inches.
If you are like the rest of us, you will probably want to make the most power you can for the least amount of money. If you have to spend a bunch of money for an LS2 conversion on a 98-02 F-Body, that is money wasted that could have made you more power.
Cheaper displacement is better, why not build an LQ4/LQ9 for cheaper than the LS2? There is a slight weight penalty, but it might be worth it if we know what you are trying to accomplish.
- What vehicle is this in?
- What is the ultimate goal for this vehicle (street, street-strip, race)?
- What is your budget?
- Power/or ET goals?
There are a lot of people in the forum who have been there, done that. Most of the people here are prepared to give you some sound advice, if we can get away from the debate over HP per 18 cubic inches.
If you are like the rest of us, you will probably want to make the most power you can for the least amount of money. If you have to spend a bunch of money for an LS2 conversion on a 98-02 F-Body, that is money wasted that could have made you more power.
Cheaper displacement is better, why not build an LQ4/LQ9 for cheaper than the LS2? There is a slight weight penalty, but it might be worth it if we know what you are trying to accomplish.
