Exp. LS Short Stroke advice needed
12-02-2006, 10:42 AM
#1
Staging Lane
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Exp. LS Short Stroke advice needed I would like someone to chim in, who has done Short Stroke engine. 6.0L with 3.28 Stroke or similar. A bigger bore would be ideal 4.125 with the New LSX. Most Road race cars have short stroke therefore I plan on building a short stroke for my future GTM but need a little detailed info.
Would a 4.8 LS stock 3.28 stroke crank with stock 4.25 rods work well enough? What heads would work? And the approximate cam lift. I realize this has been talk about alot. Katech has done this but with high dollar stuff. Is it possible and most important has it been done on the lesser $$ range.
Would a 4.8 LS stock 3.28 stroke crank with stock 4.25 rods work well enough? What heads would work? And the approximate cam lift. I realize this has been talk about alot. Katech has done this but with high dollar stuff. Is it possible and most important has it been done on the lesser $$ range.
12-02-2006, 10:52 AM
#2
Originally Posted by Karlo
I would like someone to chim in, who has done Short Stroke engine. 6.0L with 3.28 Stroke or similar. A bigger bore would be ideal 4.125 with the New LSX. Most Road race cars have short stroke therefore I plan on building a short stroke for my future GTM but need a little detailed info.
Would a 4.8 LS stock 3.28 stroke crank with stock 4.25 rods work well enough? What heads would work? And the approximate cam lift. I realize this has been talk about alot. Katech has done this but with high dollar stuff. Is it possible and most important has it been done on the lesser $$ range.
Would a 4.8 LS stock 3.28 stroke crank with stock 4.25 rods work well enough? What heads would work? And the approximate cam lift. I realize this has been talk about alot. Katech has done this but with high dollar stuff. Is it possible and most important has it been done on the lesser $$ range.
Karlo,
To make the power you're going to need a 2 stage dry sump system to reduce windage 7000-8000rpm. This is a big part of the cost.
12-02-2006, 01:17 PM
#3
Staging Lane
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Jason
Your Katech CNC-ported LS6 head PN: KAT-AA3825-R01 would this work?
Also your Katech CTS-V KAT-4072 Cam 226/226 0.585/0.585 116 would all this be Match / Fit + the dry sump????
Your Katech CNC-ported LS6 head PN: KAT-AA3825-R01 would this work?
Also your Katech CTS-V KAT-4072 Cam 226/226 0.585/0.585 116 would all this be Match / Fit + the dry sump????
12-02-2006, 02:03 PM
#4
Originally Posted by Karlo
Jason
Your Katech CNC-ported LS6 head PN: KAT-AA3825-R01 would this work?
Also your Katech CTS-V KAT-4072 Cam 226/226 0.585/0.585 116 would all this be Match / Fit + the dry sump????
Your Katech CNC-ported LS6 head PN: KAT-AA3825-R01 would this work?
Also your Katech CTS-V KAT-4072 Cam 226/226 0.585/0.585 116 would all this be Match / Fit + the dry sump????
Yes, but LS7 heads would be ideal. That cam won't make near the power of the race cam originally developed for the sneak attack LS7.
12-02-2006, 02:28 PM
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Originally Posted by Karlo
I would like someone to chim in, who has done Short Stroke engine. 6.0L with 3.28 Stroke or similar. A bigger bore would be ideal 4.125 with the New LSX. Most Road race cars have short stroke therefore I plan on building a short stroke for my future GTM but need a little detailed info.
Would a 4.8 LS stock 3.28 stroke crank with stock 4.25 rods work well enough? What heads would work? And the approximate cam lift. I realize this has been talk about alot. Katech has done this but with high dollar stuff. Is it possible and most important has it been done on the lesser $$ range.
Would a 4.8 LS stock 3.28 stroke crank with stock 4.25 rods work well enough? What heads would work? And the approximate cam lift. I realize this has been talk about alot. Katech has done this but with high dollar stuff. Is it possible and most important has it been done on the lesser $$ range.
Nate
12-02-2006, 02:34 PM
#6
Karlo,
I know you like the sounds of this short stroke deal... I don't blame you in some respects but your always going to have a tall deckheight block as part of the problem here. The least amount of stroke I would run is a 3.622" stock stroke. Unless you had Dart make you a short deckheight large bore billet LS block I wouldn't worry about going with a shorter stroke. The main benefit of a short stroke other than allowing more RPM with less stress on the parts is packaging and a lower center of gravity. A 9.240" deck height and a 3.3" stroke don't make much sense. If I was going with a stroke that short I would take 1" out of the deck height, run some killer heads and sheetmetal intake. That would get you the 6.0L displacement in a low package, which seems to be what you want here for your car.
FWIW fit as much displacement as you can into a package. Racing versions of LS motors are 350lbs, and that can be anything from a 5.0-7.0L motor.
Bret
I know you like the sounds of this short stroke deal... I don't blame you in some respects but your always going to have a tall deckheight block as part of the problem here. The least amount of stroke I would run is a 3.622" stock stroke. Unless you had Dart make you a short deckheight large bore billet LS block I wouldn't worry about going with a shorter stroke. The main benefit of a short stroke other than allowing more RPM with less stress on the parts is packaging and a lower center of gravity. A 9.240" deck height and a 3.3" stroke don't make much sense. If I was going with a stroke that short I would take 1" out of the deck height, run some killer heads and sheetmetal intake. That would get you the 6.0L displacement in a low package, which seems to be what you want here for your car.
FWIW fit as much displacement as you can into a package. Racing versions of LS motors are 350lbs, and that can be anything from a 5.0-7.0L motor.
Bret
Last edited by SStrokerAce; 12-02-2006 at 04:14 PM.
12-02-2006, 02:56 PM
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YES, the new LSX motor bored to 4.25 and running a stock LS1 3.662 crank would make the ULTIMATE AFFORDABLE 410 cubic inch ALL BORE MOTOR and would REV super fast and make for a great racing motor!! 
MAN, this Longblock could probably be put together for $6K (estimate off the top of my head) uitilzing one's existing stock LS1 crank in their LS1/6 car
MAN, this Longblock could probably be put together for $6K (estimate off the top of my head) uitilzing one's existing stock LS1 crank in their LS1/6 car Trending Topics
12-02-2006, 06:15 PM
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Originally Posted by Katech
Yes, but LS7 heads would be ideal. That cam won't make near the power of the race cam originally developed for the sneak attack LS7.
12-03-2006, 01:42 PM
#10
FormerVendor
You could run the 4.8 crank but again like has already been said you will just lose torque everywhere. I've seen many of these and they just accelerate somewhat slower while making more noise and wearing out faster.
12-03-2006, 01:43 PM
#11
FormerVendor
If you have a manifold optimized for it it might work better and you need to worry about high rpm oiling as well since LSx engines don't fair so well up at high rpm with the stock oiling systems. You might want to look into Katechs oiling system mods and system for sure.
