View Poll Results: What is the biggest stroke that will fit a stock LS2 block
Voters: 93. You may not vote on this poll
4.1" or 4.125" stroke possible in a stock LS2 block?
11-19-2006, 09:02 PM
#43
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Originally Posted by GIGAPUNK
Magical electrons really want to hear some one tell us about the 4.25" crank that they stuffed in a non sleeved block!
11-19-2006, 09:21 PM
#44
FormerVendor
Originally Posted by GIGAPUNK
Magical electrons really want to hear some one tell us about the 4.25" crank that they stuffed in a non sleeved block!
Even 4.100 is really pushing it with the short sleeves and most piston designs and ring packs. With the right piston I think it is alright but it is not going to be the best NOS or power adder piston. With a 5.450 long cylinder and 4.100 stroke you are already down to 1.350 or sleeve left at BDC.
A normal 1/16, 1/16, 3/16 ring stack is already .750-.800 tall so you only have .550 to .600 or piston skirt in the cylinder at BDC at that point. You can run a shorter ring stack to get more piston skirt in the bore at BDC but then the piston starts becoming weaker too so it depends on the application basically.
With the longer sleeves of the aftermarket blocks and the C5R or LS7 the 4.250 is not such a bad idea and should live a long time. I've built several and they run great. We had a 4.500 stroke in the 500 incher at SAM with the long 6+ inch long cylinders.
11-26-2006, 10:20 AM
#45
Originally Posted by racer7088
I've seen 4 or 5 of these 4.250 deals in stock blocks and all were oil burning pigs and 3 blew up. One was a deal from ARE and the other 4 or so were from buffoons here in Houston no longer in business. The problems were those we talked about in the other thread and the ones Brian Nutter was alluding too.
Even 4.100 is really pushing it with the short sleeves and most piston designs and ring packs. With the right piston I think it is alright but it is not going to be the best NOS or power adder piston. With a 5.450 long cylinder and 4.100 stroke you are already down to 1.350 or sleeve left at BDC.
A normal 1/16, 1/16, 3/16 ring stack is already .750-.800 tall so you only have .550 to .600 or piston skirt in the cylinder at BDC at that point. You can run a shorter ring stack to get more piston skirt in the bore at BDC but then the piston starts becoming weaker too so it depends on the application basically.
With the longer sleeves of the aftermarket blocks and the C5R or LS7 the 4.250 is not such a bad idea and should live a long time. I've built several and they run great. We had a 4.500 stroke in the 500 incher at SAM with the long 6+ inch long cylinders.
Even 4.100 is really pushing it with the short sleeves and most piston designs and ring packs. With the right piston I think it is alright but it is not going to be the best NOS or power adder piston. With a 5.450 long cylinder and 4.100 stroke you are already down to 1.350 or sleeve left at BDC.
A normal 1/16, 1/16, 3/16 ring stack is already .750-.800 tall so you only have .550 to .600 or piston skirt in the cylinder at BDC at that point. You can run a shorter ring stack to get more piston skirt in the bore at BDC but then the piston starts becoming weaker too so it depends on the application basically.
With the longer sleeves of the aftermarket blocks and the C5R or LS7 the 4.250 is not such a bad idea and should live a long time. I've built several and they run great. We had a 4.500 stroke in the 500 incher at SAM with the long 6+ inch long cylinders.
11-26-2006, 12:36 PM
#46
Originally Posted by Dragaholic
What the heck is up with this thread? I keep seeing it get bumped up with new postings, but when I view the thread, it still has the same last post from Randy WS6. If you're looking at the threads just browsing the section, you'll see the last post was made at 10:41 pm yesterday, but when you actually go into the thread and view it, it says the last post was made on 10/27/06.
11-26-2006, 01:07 PM
#47
FormerVendor
Hahahaha, yes it's hard to ever get enough cubes. Almost everyone I know starts small and then keeps buiding bigger on their subsequent engines. Never really seen the other way around much.
Originally Posted by Beast96Z
Making me wish I'd have went with the 4.250" when you tried to get me to. Tell ya what, talk someone into buying my 454 short and I'll get ya to build me a 469ci, LS7 sleeved, long stroke motor.
11-26-2006, 06:41 PM
#48
Pin size? Some new ring packs are supposed to be coming out in the near future to make new found craziness possible, but like was said before, they won't be ideal for power adders.
What are the pros and cons of changing the size on the pins?
What are the pros and cons of changing the size on the pins?
11-26-2006, 07:24 PM
#49
I got my LS2 418cid. running and love it, 4.100"stroke & 6.125 rods & 4.030" bore . It has massive torque. It was a job to build at home , a lot of clearance problems with the crank and rods hitting every thing in the block and the front of the f-body oil pan ,but all in all it was well worth it. I had ROSS cut me a custom set of pistons. They had never herd of a 418cid. I had to take a lot of measurement while on the phone with Chris at ROSS and they fit perfect
11-26-2006, 07:29 PM
#50
Sleeve length and stroke Nate,
The Darton dry sleeves for the LS2 and LS7 blocks are actually 5.800" overall length. C5R has the longest sleeves at 6".
The original Darton dry sleeves were 5.675". I had them increase the length to 5.800" several months back.
Why stop at 5.800". The main web is 6.250" from the deck surface. At 5.800" there is .450" over travel for honing. Much less than this and it becomes very difficult to hone the cylinders without getting taper in the bores. A longer over hanging sleeve in the crankcase would be unsupported. If it hangs out in open space too much it will spring away from the hone. I bet the C5R is a real bitch to hone without a lot of experience and the correct machine $$ to hone the block with.
I would not go further than 4" stroke with the LS2 blocks and stock sleeves. Even 4" is pushing things with the short stock sleeve length for long term street use.
Steve
The Darton dry sleeves for the LS2 and LS7 blocks are actually 5.800" overall length. C5R has the longest sleeves at 6".
The original Darton dry sleeves were 5.675". I had them increase the length to 5.800" several months back.
Why stop at 5.800". The main web is 6.250" from the deck surface. At 5.800" there is .450" over travel for honing. Much less than this and it becomes very difficult to hone the cylinders without getting taper in the bores. A longer over hanging sleeve in the crankcase would be unsupported. If it hangs out in open space too much it will spring away from the hone. I bet the C5R is a real bitch to hone without a lot of experience and the correct machine $$ to hone the block with.
I would not go further than 4" stroke with the LS2 blocks and stock sleeves. Even 4" is pushing things with the short stock sleeve length for long term street use.
Steve
Originally Posted by Nate_Taufer
The liners are the same length as the LS2. I believe they're 5.4" whereas the Darton sleeves or LS7 are 5.9" but I could be wrong...it's been a while since I looked. A 4.125" stroke crank will work but if not setup right (like any setup) will have big problems. I think SDPC steers away from setups like this is because it requires custom pistons and clearances start shrinking pretty quickly. Better to just play it safe.
Nate
Nate
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Steve Demirjian
Race Engine Development
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Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
11-26-2006, 10:54 PM
#51
FormerVendor
I am going to do some of my own custom pistons that will work with the short cylinder at 4.100 stroke but they won't be for power adder usage. Otherwise with the stronger stuff I agree with Steve that 4.000 is about the limit for the stock sleeves in the LSx stuff.
11-26-2006, 10:59 PM
#52
Originally Posted by racer7088
I am going to do some of my own custom pistons that will work with the short cylinder at 4.100 stroke but they won't be for power adder usage. Otherwise with the stronger stuff I agree with Steve that 4.000 is about the limit for the stock sleeves in the LSx stuff.
04-04-2007, 06:55 AM
#54
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Just got my newest edition of GM High Tech Performance today and see that Sroggin Dickey has released their new LS2/L92/LS7 "Big Bull" short blocks. All of these new shortblocks posted below are right out of SDPC's add and they all utilze the new SDPC/CALLIES 4.1 crank. It is my preference to use a 4.00 crank in a big cubes LS series motor but I would think these bad boys would be reliable in a full max effort N/A application that I am looking to build with Trick Flow 225 heads and a nice aggressive street/strip cam making around 11:5 to 1 compression.
HERE YOU GO and let's get your feedback as this is exciting ****:
LS2 block, 4.005 bore, 4.1 stroke crank, 413 cid for $4,569.00
L92 block, 4.068 bore, 4.1 stroke crank, 427 cid for $4,929.00
LS7block, 4.125, 4.1 stroke crank, 440 cid for $6,289.00
"All of the above big bull LS engine short block by SDPC features the new SDPC/CALLIES 4.100 stroke crank, manley forged pistons, scat H-Beam Rods, and a new GM alum Block.
What do you guys engine gurus (like ERIK) think and others here with good knowledge on this stuff. Do you think these shortblocks would be reliable in a max effort 11:5 to 1 compression street engine that is only going to stay N/A?
HERE YOU GO and let's get your feedback as this is exciting ****:
LS2 block, 4.005 bore, 4.1 stroke crank, 413 cid for $4,569.00
L92 block, 4.068 bore, 4.1 stroke crank, 427 cid for $4,929.00
LS7block, 4.125, 4.1 stroke crank, 440 cid for $6,289.00
"All of the above big bull LS engine short block by SDPC features the new SDPC/CALLIES 4.100 stroke crank, manley forged pistons, scat H-Beam Rods, and a new GM alum Block.
What do you guys engine gurus (like ERIK) think and others here with good knowledge on this stuff. Do you think these shortblocks would be reliable in a max effort 11:5 to 1 compression street engine that is only going to stay N/A?
04-04-2007, 10:57 AM
#55
FormerVendor
Originally Posted by Chicago Crew UnderBoss
Just got my newest edition of GM High Tech Performance today and see that Sroggin Dickey has released their new LS2/L92/LS7 "Big Bull" short blocks. All of these new shortblocks posted below are right out of SDPC's add and they all utilze the new SDPC/CALLIES 4.1 crank. It is my preference to use a 4.00 crank in a big cubes LS series motor but I would think these bad boys would be reliable in a full max effort N/A application that I am looking to build with Trick Flow 225 heads and a nice aggressive street/strip cam making around 11:5 to 1 compression.
HERE YOU GO and let's get your feedback as this is exciting ****:
LS2 block, 4.005 bore, 4.1 stroke crank, 413 cid for $4,569.00
L92 block, 4.068 bore, 4.1 stroke crank, 427 cid for $4,929.00
LS7block, 4.125, 4.1 stroke crank, 440 cid for $6,289.00
"All of the above big bull LS engine short block by SDPC features the new SDPC/CALLIES 4.100 stroke crank, manley forged pistons, scat H-Beam Rods, and a new GM alum Block.
What do you guys engine gurus (like ERIK) think and others here with good knowledge on this stuff. Do you think these shortblocks would be reliable in a max effort 11:5 to 1 compression street engine that is only going to stay N/A?
HERE YOU GO and let's get your feedback as this is exciting ****:
LS2 block, 4.005 bore, 4.1 stroke crank, 413 cid for $4,569.00
L92 block, 4.068 bore, 4.1 stroke crank, 427 cid for $4,929.00
LS7block, 4.125, 4.1 stroke crank, 440 cid for $6,289.00
"All of the above big bull LS engine short block by SDPC features the new SDPC/CALLIES 4.100 stroke crank, manley forged pistons, scat H-Beam Rods, and a new GM alum Block.
What do you guys engine gurus (like ERIK) think and others here with good knowledge on this stuff. Do you think these shortblocks would be reliable in a max effort 11:5 to 1 compression street engine that is only going to stay N/A?
I think with the right piston and staying NA the ring stack and skirt can be made to work with teh stock cylinder length as I have done it and am doing it right now. But the key word is NA only as the rings are getting pretty tight. I use thinner rings and a longer rod on mine.
04-05-2007, 08:36 PM
#57
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maybe im just a little slow, but somebody let me know if i am understanding this right.
an LS2 block bored to 4.030 with a 4.100 crank using 6.125 rod (or a 6.200 rod???) will have sleeve issues at BDC, but should be fine if staying NA? thanks
an LS2 block bored to 4.030 with a 4.100 crank using 6.125 rod (or a 6.200 rod???) will have sleeve issues at BDC, but should be fine if staying NA? thanks
04-06-2007, 09:59 AM
#60
FormerVendor
Originally Posted by GIGAPUNK
There are starting to be some used LS7 blocks floating out there in the used market. Do they differ to the LS2 in a way that would allow a longer stroke?