LSX Piston Selection
LSX Piston Selection Need to buy the pistons for my LSX-440 engine. I've seen Pistons designated for 4.000 Stroke and 4.125 Stroke, big price difference between the two... I'm guessing I can't, but can you use 4.000 Stroke Pistons on a 4.125 Stroke-Crank? Assume same connecting rod.
What's the difference between the two pistons? Is it the distance from the centerline of the pin to the top ring land or something like that?
Charlie
What's the difference between the two pistons? Is it the distance from the centerline of the pin to the top ring land or something like that?
Charlie
Need to buy the pistons for my LSX-440 engine. I've seen Pistons designated for 4.000 Stroke and 4.125 Stroke, big price difference between the two... I'm guessing I can't, but can you use 4.000 Stroke Pistons on a 4.125 Stroke-Crank? Assume same connecting rod.
What's the difference between the two pistons? Is it the distance from the centerline of the pin to the top ring land or something like that?
Charlie
What's the difference between the two pistons? Is it the distance from the centerline of the pin to the top ring land or something like that?
Charlie
any compression height piston, con rod, stroke can be manipulated to achieve a specific ci engine.
what crank do u plan on using,pistons?
I've got a Callies 4.125 Crank, and 6.125 Rods. TSP L92 Heads. Plan is for a 10.5'ish compression ratio motor. No racing, just want lot's of torque.
The LSX Block is new, plans were to bore it to 4.125 to leave room for future expansion if needed.
I've got a lead on a new set of 4.125 Bore/4.000 Stroke Diamond PN 11522 Pistons/Rings for $500, so I'm real interested to understand if they could work, just not familiar with all the variables of what can/can't work. Getting it done at a shop here in the D/FW area, but it is time for pistons.
Thanks for the help...
Charlie
The LSX Block is new, plans were to bore it to 4.125 to leave room for future expansion if needed.
I've got a lead on a new set of 4.125 Bore/4.000 Stroke Diamond PN 11522 Pistons/Rings for $500, so I'm real interested to understand if they could work, just not familiar with all the variables of what can/can't work. Getting it done at a shop here in the D/FW area, but it is time for pistons.
Thanks for the help...
Charlie
Last edited by CharlieC; Oct 18, 2008 at 11:25 PM.
This should answer your question. Give Brian Nutter a call. He'll take care of your engine.
https://ls1tech.com/forums/showthrea...ht=lsx+pistons
LSX
https://ls1tech.com/forums/showthrea...ht=lsx+pistons
LSX
Thanks for the reply... I had read that thread previously, but it was more of a why Diamond vs Wiseco. Good to know, but I'm just trying to understand the 4.0 vs 4.125 piston question.
Charlie
Charlie
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Given the same deck height... you would need .125" shorter compression height(distance from wrist pin centerline to the fire deck of the piston) with the 4.125" stroke using the same rod.
Deck height is measured from crank centerline to the top of the deck. Then take the rod length add 1/2 the stroke and subtract that from the deck height to get compression height needed on your pistons. Some guys run the pistons a little above the block's deck..."Out of the hole".
Here is what i get for your setup.... This assumes that you want it even with the block's deck....
Deck Height: 9.240 LS
Stroke: 4.125
Rod Length: 6.125
Compression Hgt: 1.053 inches
So basically, no you can't use the 4" stroke pistons on the 4.125" stock crank using the same rods cause the 4" pistons will have a taller compression height and be sticking out of the hole by .125" when using the 4.125" crank.
Deck height is measured from crank centerline to the top of the deck. Then take the rod length add 1/2 the stroke and subtract that from the deck height to get compression height needed on your pistons. Some guys run the pistons a little above the block's deck..."Out of the hole".
Here is what i get for your setup.... This assumes that you want it even with the block's deck....
Deck Height: 9.240 LS
Stroke: 4.125
Rod Length: 6.125
Compression Hgt: 1.053 inches
So basically, no you can't use the 4" stroke pistons on the 4.125" stock crank using the same rods cause the 4" pistons will have a taller compression height and be sticking out of the hole by .125" when using the 4.125" crank.
Given the same deck height... you would need .125" shorter compression height(distance from wrist pin centerline to the fire deck of the piston) with the 4.125" stroke using the same rod.
Deck height is measured from crank centerline to the top of the deck. Then take the rod length add 1/2 the stroke and subtract that from the deck height to get compression height needed on your pistons. Some guys run the pistons a little above the block's deck..."Out of the hole".
Here is what i get for your setup.... This assumes that you want it even with the block's deck....
Deck Height: 9.240 LS
Stroke: 4.125
Rod Length: 6.125
Compression Hgt: 1.053 inches
So basically, no you can't use the 4" stroke pistons on the 4.125" stock crank using the same rods cause the 4" pistons will have a taller compression height and be sticking out of the hole by .125" when using the 4.125" crank.
Deck height is measured from crank centerline to the top of the deck. Then take the rod length add 1/2 the stroke and subtract that from the deck height to get compression height needed on your pistons. Some guys run the pistons a little above the block's deck..."Out of the hole".
Here is what i get for your setup.... This assumes that you want it even with the block's deck....
Deck Height: 9.240 LS
Stroke: 4.125
Rod Length: 6.125
Compression Hgt: 1.053 inches
So basically, no you can't use the 4" stroke pistons on the 4.125" stock crank using the same rods cause the 4" pistons will have a taller compression height and be sticking out of the hole by .125" when using the 4.125" crank.
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Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
