How much power from 441"
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From: Granbury Texas
How much power from 441" I am talking to a sponser right now about building me another great set-up and this time going all out on a 441" using LS7 parts with a medium size cam.
I searched and cannot find any HP numbers from these size motors.
Please post up what you guys are seeing.
Thanks DG
I searched and cannot find any HP numbers from these size motors.
Please post up what you guys are seeing.
Thanks DG
8 Second Club
Joined: May 2002
Posts: 1,043
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From: Toronto
Originally Posted by David Gordon
I am talking to a sponser right now about building me another great set-up and this time going all out on a 441" using LS7 parts with a medium size cam.
I searched and cannot find any HP numbers from these size motors.
Please post up what you guys are seeing.
Thanks DG
I searched and cannot find any HP numbers from these size motors.
Please post up what you guys are seeing.
Thanks DG
I agree with Andre, you should be able to make close to 700 to the crank no problem. You just have to spec out your cam properly, and make sure you're running good compression.
What are the specs on the engine going to be? What are you going to use? I was doing a 446 not too long ago that fell through the day I was supposed to get the engine...not too happy about that. I'm now getting a 427 and should have it by this weekend if everything goes well.
Adrian
Adrian
What are the specs on the engine going to be? What are you going to use? I was doing a 446 not too long ago that fell through the day I was supposed to get the engine...not too happy about that. I'm now getting a 427 and should have it by this weekend if everything goes well.
Adrian
Adrian
You can't run a 4.125" crank in the LS7 block because the sleeves are too short. You'll end up pulling the piston out of the hole too much to the point where the rings will come out....VERY bad. The largest you should go is 4" on the LS7 block.
If you want to be able to use a 4.125" crank, then you'll need to get it resleeved with Darton LS7 sleeves which can accomodate a 4.25" stroke. Also, depending on how much you can find a LS2 block for, you can end up with a better block then the LS7 for less then the cost of a LS7 block.
Also, using a 4.125" stroke will make for some poor pistons, as the ringlands will all be really smashed together if using a 6.125" rod because the Compression Height will be too small.Yyou should call Eric at Diamond Racing so he can help guide you with options for pistons so they can make you a good quality piston.
Now, if you're building a straight race motor that will be rebuilt year after year, then forget the last bit about the pistons
Best Regards,
Adrian
If you want to be able to use a 4.125" crank, then you'll need to get it resleeved with Darton LS7 sleeves which can accomodate a 4.25" stroke. Also, depending on how much you can find a LS2 block for, you can end up with a better block then the LS7 for less then the cost of a LS7 block.
Also, using a 4.125" stroke will make for some poor pistons, as the ringlands will all be really smashed together if using a 6.125" rod because the Compression Height will be too small.Yyou should call Eric at Diamond Racing so he can help guide you with options for pistons so they can make you a good quality piston.
Now, if you're building a straight race motor that will be rebuilt year after year, then forget the last bit about the pistons
Best Regards,
Adrian
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What work? If it has been resleeved, then you're golden, if not, then you're toast to use a Stock LS7 with a 4.125" stroke. The only way you can run that big of a stroke is to get new sleeves, there are no other options.
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Originally Posted by Haans249
What work? If it has been resleeved, then you're golden, if not, then you're toast to use a Stock LS7 with a 4.125" stroke. The only way you can run that big of a stroke is to get new sleeves, there are no other options.
Show me somewhere where someone put a larger then 4" stroke on stock sleeves and didn't have the engine fail.
Its not just the ringlands that you have to worry about, its how far the skirt comes out as well, cause if you pull it out too much, the piston will rock at BDC, and toast your pistons skirts/cylinder walls. The engine won't last longer then one season, if not one week.
You can't run longer then a 4" stroke on stock sleeves and expect the engine to last....end of story.
Adrian
Its not just the ringlands that you have to worry about, its how far the skirt comes out as well, cause if you pull it out too much, the piston will rock at BDC, and toast your pistons skirts/cylinder walls. The engine won't last longer then one season, if not one week.
You can't run longer then a 4" stroke on stock sleeves and expect the engine to last....end of story.
Adrian
Originally Posted by Haans249
Show me somewhere where someone put a larger then 4" stroke on stock sleeves and didn't have the engine fail.
Its not just the ringlands that you have to worry about, its how far the skirt comes out as well, cause if you pull it out too much, the piston will rock at BDC, and toast your pistons skirts/cylinder walls. The engine won't last longer then one season, if not one week.
You can't run longer then a 4" stroke on stock sleeves and expect the engine to last....end of story.
Adrian
Its not just the ringlands that you have to worry about, its how far the skirt comes out as well, cause if you pull it out too much, the piston will rock at BDC, and toast your pistons skirts/cylinder walls. The engine won't last longer then one season, if not one week.
You can't run longer then a 4" stroke on stock sleeves and expect the engine to last....end of story.
Adrian
TECH Regular
Joined: Feb 2006
Posts: 437
Likes: 2
From: Cleveland
sleeve length. helping out for the greater good. Don't be so quick to determine what stroke will and will not work. Piston skirt design on custom pistons is a variable and it's your duty to know the sleeve length of your motor (if you're building a stroker). If your piston company goes "huh?" when you bring up the subject, you better move on to one that's knows something about building engines-because they're going to screw up another 9 variables that I didn't tell you about.-Brian Nutter
Originally Posted by Haans249
Show me somewhere where someone put a larger then 4" stroke on stock sleeves and didn't have the engine fail.
Its not just the ringlands that you have to worry about, its how far the skirt comes out as well, cause if you pull it out too much, the piston will rock at BDC, and toast your pistons skirts/cylinder walls. The engine won't last longer then one season, if not one week.
You can't run longer then a 4" stroke on stock sleeves and expect the engine to last....end of story.
Adrian
Its not just the ringlands that you have to worry about, its how far the skirt comes out as well, cause if you pull it out too much, the piston will rock at BDC, and toast your pistons skirts/cylinder walls. The engine won't last longer then one season, if not one week.
You can't run longer then a 4" stroke on stock sleeves and expect the engine to last....end of story.
Adrian
Wow, that really amazes me, I didn't think it would be possible with stock sleeves and I haven't heard of anyone yet who has a motor lasting with an arm that big on stock sleeve length. I've talked with guys with lots of experience in this realm, but I guess I have to take everything with a grain of salt until i see if for myself. God damn I hate being that guy... Sorry for causing an argument over something that I realize I didn't know anything about. On to more research for this guy right here...
Best,
Adrian
Best,
Adrian
https://ls1tech.com/forums/showthrea...66#post5366766
Here is an interesting post about the sleeves in a LS7 block. Verifies what Beast was saying! Probably some very interesting info for you Mr.Gordon. You could probably run a 4.25" stroke crank in that LS7 block with little worry, but don't quote me on that
Here is an interesting post about the sleeves in a LS7 block. Verifies what Beast was saying! Probably some very interesting info for you Mr.Gordon. You could probably run a 4.25" stroke crank in that LS7 block with little worry, but don't quote me on that
Originally Posted by Haans249
https://ls1tech.com/forums/showthrea...66#post5366766
Here is an interesting post about the sleeves in a LS7 block. Verifies what Beast was saying! Probably some very interesting info for you Mr.Gordon. You could probably run a 4.25" stroke crank in that LS7 block with little worry, but don't quote me on that
Here is an interesting post about the sleeves in a LS7 block. Verifies what Beast was saying! Probably some very interesting info for you Mr.Gordon. You could probably run a 4.25" stroke crank in that LS7 block with little worry, but don't quote me on that
Teching In
Joined: Mar 2003
Posts: 44
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From: Forest Hill, Maryland
Originally Posted by David Gordon
I am talking to a sponser right now about building me another great set-up and this time going all out on a 441" using LS7 parts with a medium size cam.
I searched and cannot find any HP numbers from these size motors.
Please post up what you guys are seeing.
Thanks DG
I searched and cannot find any HP numbers from these size motors.
Please post up what you guys are seeing.
Thanks DG
Last edited by supercoupe01; Aug 17, 2006 at 10:51 AM.
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Joined: May 2002
Posts: 1,043
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From: Toronto
Originally Posted by supercoupe01
I have an ECS447 LS6 Darton block with LS6 stage three heads with a medium size cam making 570/540 at the wheels running pump gas. Most have not been getting much more with LS7 stuff yet. Two years and still running strong.