KNOW IT ALLS APPLY HERE!!! (Take the Quiz)
Thread Starter
Instructor
Joined: Aug 2006
Posts: 103
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From: Sacramento Ca
KNOW IT ALLS APPLY HERE!!! (Take the Quiz)
I have a 1998 ls1 c5 with ported and polished patriot heads with dual springs, hardened p-rods, and 62cc combustion chamber.
I just spun a rod and need to rebuild my bottom end.
My question is whether or not I should replace the bottom end with stock
LS1 parts, or should I go for a 383 stroker kit instead. With the stock bottom end I was running around 10:7:1 compression. If I go with the 383 stroker, I know my compression will increase but by how much. I live in Ca and all I can get is 91 octane on pump gas. I have heard of people with 11:1 CR or slightly higher running 91 octane and say, "it is all in the tune." IS THIS TRUE? I need some input. I do not want to have to put race gas in my car because it is my daily driver.
I need some input. Thanks
I just spun a rod and need to rebuild my bottom end.
My question is whether or not I should replace the bottom end with stock
LS1 parts, or should I go for a 383 stroker kit instead. With the stock bottom end I was running around 10:7:1 compression. If I go with the 383 stroker, I know my compression will increase but by how much. I live in Ca and all I can get is 91 octane on pump gas. I have heard of people with 11:1 CR or slightly higher running 91 octane and say, "it is all in the tune." IS THIS TRUE? I need some input. I do not want to have to put race gas in my car because it is my daily driver.
I need some input. Thanks
Drifting
Joined: Oct 2003
Posts: 1,923
Likes: 5
From: San Antonio TX
Originally Posted by Jackal
I would go with the 383 if money is an issue. Otherwise I would build a 402. I dont know if the compression will change or not with a stroker, I guess it depends on the pistons you get.
you can get forged 347 shortblocks (stock crank forged rods, pistons, no core) for less than $3k, it is going to cost you aroung 1500 for forged parts and about 1000 for machine work, you supply the core. to me if going 347 then just get a short block.
More Than Zero
Tech Contributor
Joined: Dec 1999
Posts: 32,910
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Im by NO means a tuner but, yes,,,,its allllll in the tune. You can adjust the timing through out the RPM range to compenste for what grade fuel you have to work with!
GM has options in the timing tables that allow the car to operate on lower octane fuel if you have to use it. So, build the engine that you want and get a GOOD TUNER to make it work for you!
BC
GM has options in the timing tables that allow the car to operate on lower octane fuel if you have to use it. So, build the engine that you want and get a GOOD TUNER to make it work for you! BC
Melting Slicks
Joined: Jun 2004
Posts: 3,439
Likes: 6
From: Newark, DE
St. Jude Donor '06
Originally Posted by C5Stunner
I have a 1998 ls1 c5 with ported and polished patriot heads with dual springs, hardened p-rods, and 62cc combustion chamber.
I just spun a rod and need to rebuild my bottom end.
My question is whether or not I should replace the bottom end with stock
LS1 parts, or should I go for a 383 stroker kit instead. With the stock bottom end I was running around 10:7:1 compression. If I go with the 383 stroker, I know my compression will increase but by how much. I live in Ca and all I can get is 91 octane on pump gas. I have heard of people with 11:1 CR or slightly higher running 91 octane and say, "it is all in the tune." IS THIS TRUE?
I just spun a rod and need to rebuild my bottom end.
My question is whether or not I should replace the bottom end with stock
LS1 parts, or should I go for a 383 stroker kit instead. With the stock bottom end I was running around 10:7:1 compression. If I go with the 383 stroker, I know my compression will increase but by how much. I live in Ca and all I can get is 91 octane on pump gas. I have heard of people with 11:1 CR or slightly higher running 91 octane and say, "it is all in the tune." IS THIS TRUE?
I have an LS2-based 402 stroker (about the same order of magnitude cid difference as an LS1-based 382/383) w/ 11:1 cr, and it runs fine on California 91 octane. I believe that it IS all in the tune.
GL!
Former Vendor
Joined: Feb 2004
Posts: 10,876
Likes: 8
From: Las Vegas NV
St. Jude Donor '06 & '12
Originally Posted by C5Stunner
I have a 1998 ls1 c5 with ported and polished patriot heads with dual springs, hardened p-rods, and 62cc combustion chamber.
I just spun a rod and need to rebuild my bottom end.
My question is whether or not I should replace the bottom end with stock
LS1 parts, or should I go for a 383 stroker kit instead. With the stock bottom end I was running around 10:7:1 compression. If I go with the 383 stroker, I know my compression will increase but by how much. I live in Ca and all I can get is 91 octane on pump gas. I have heard of people with 11:1 CR or slightly higher running 91 octane and say, "it is all in the tune." IS THIS TRUE? I need some input. I do not want to have to put race gas in my car because it is my daily driver.
I need some input. Thanks
I just spun a rod and need to rebuild my bottom end.
My question is whether or not I should replace the bottom end with stock
LS1 parts, or should I go for a 383 stroker kit instead. With the stock bottom end I was running around 10:7:1 compression. If I go with the 383 stroker, I know my compression will increase but by how much. I live in Ca and all I can get is 91 octane on pump gas. I have heard of people with 11:1 CR or slightly higher running 91 octane and say, "it is all in the tune." IS THIS TRUE? I need some input. I do not want to have to put race gas in my car because it is my daily driver.
I need some input. Thanks
You have to replace the pistons anyways to compensate for the longer stroke don't you?? If you didnt, you'de be crazy for rebuilding the motor with stock pistons and rods. It would be no better than an OEM motor.
I say (If your strapped for cash) go with a 4" crank, diamond pistons, and eagle rods. This will give you a nice and stout forged 383.
If you've got extra cash, then go with a 402. But dont expect to get away with only and extra grand. becuase there are quite a few extra parts needed when building a stronger motor.
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Former Vendor
Joined: Mar 2004
Posts: 1,518
Likes: 7
From: Valencia CA
Given the same induction and exhaust (heads, cam, intake, etc.) a 383 will make similar power compared to the 402 (but do it a little higher in the curve) and make less peak TQ. Depending on traction available and presumably a street tire that could be a good thing. I think while the LS2 based engines represent good value, they still do in fact cost a little more and the swap is more involved as well assuming you want to retain your knock sensors and other things. You have to buy a new front cover, extend some wiring and also purchase a new valley pan. These are the little hidden costs and extra labor thats involved with the LS2 based swap.
Either one is a winner, but if your on a budget and want a cake install, and LS1/LS6 based 383 stroker is still very effective....ask me how I know....LOL
Tony M.
Either one is a winner, but if your on a budget and want a cake install, and LS1/LS6 based 383 stroker is still very effective....ask me how I know....LOL
Tony M.
Last edited by Tony Mamo; Aug 25, 2006 at 11:23 PM.
Team Owner
Joined: May 2005
Posts: 23,682
Likes: 9
From: Flagstaff Az.
Compression
American HP
Since the compression ratio is the ratio between the cylinder volume at down stroke as opposed to the volume at top stroke and the volume is greater with a longer stroke crank at down stroke the compression ratio is greater unless you dish or fly cut the pistons. In a stroker kit you can usually order the pistons to give you the ratio you want.
Since the compression ratio is the ratio between the cylinder volume at down stroke as opposed to the volume at top stroke and the volume is greater with a longer stroke crank at down stroke the compression ratio is greater unless you dish or fly cut the pistons. In a stroker kit you can usually order the pistons to give you the ratio you want.
Team Owner
Joined: May 2005
Posts: 23,682
Likes: 9
From: Flagstaff Az.
quiz
Originally Posted by kpforce1
He said it was a 98... could have been oil starvation issues or just oil issues in general...
Thread Starter
Instructor
Joined: Aug 2006
Posts: 103
Likes: 0
From: Sacramento Ca
Originally Posted by tiojames
Ferrets was refering to the post "I spun a rod" instead of I spun a rod bearing, I think, maybe.
Drifting
Joined: Oct 2003
Posts: 1,923
Likes: 5
From: San Antonio TX
Originally Posted by Tony Mamo
Given the same induction and exhaust (heads, cam, intake, etc.) a 383 will make similar power compared to the 402 (but do it a little higher in the curve) and make less peak TQ. Depending on traction available and presumably a street tire that could be a good thing. I think while the LS2 based engines represent good value, they still do in fact cost a little more and the swap is more involved as well assuming you want to retain your knock sensors and other things. You have to buy a new front cover, extend some wiring and also purchase a new valley pan. These are the little hidden costs and extra labor thats involved with the LS2 based swap.
Either one is a winner, but if your on a budget and want a cake install, and LS1/LS6 based 383 stroker is still very effective....ask me how I know....LOL
Tony M.
Either one is a winner, but if your on a budget and want a cake install, and LS1/LS6 based 383 stroker is still very effective....ask me how I know....LOL
Tony M.
More Than Zero
