383 stroker compression ratio
Thread Starter
Drifting
Joined: Mar 2015
Posts: 1,275
Likes: 165
From: Utah
383 stroker compression ratio
This winter I'm planning on pulling my engine for a refresh.
While planning this I'm thinking about doing a 383 stroker...
Using my heads (70cc chamber aluminum heads) and forged pistons available, it seems I might end up a bit limited on options...
Think a Dynamic compression ratio of 8.32, and a Static of 10.08 will be ok on pump gas?
(I'll have many more questions as I get closer
)
While planning this I'm thinking about doing a 383 stroker...
Using my heads (70cc chamber aluminum heads) and forged pistons available, it seems I might end up a bit limited on options...
Think a Dynamic compression ratio of 8.32, and a Static of 10.08 will be ok on pump gas?
(I'll have many more questions as I get closer
)
Safety Car
Joined: Apr 2005
Posts: 3,624
Likes: 431
From: Dale City VA
I am not sure how you are calculating DCR but thats a pretty high number for only 10.0 SCR.
Honestly 10.0 SCR sounds optimistic with 70cc heads and 8cc pistons... you would need to be zero deck with a .039 4.166 (Fel Pro 1010) gasket to get 10.03SCR. Switching to 6cc pistons only gets you to 10.25... even a stock L98 cam will run fine on 93 octane with that compression ratio.
Depending on what rod you want to use Wiseco has some 7cc flat tops that are very affordable, around $450 a set including rings.
Will
Honestly 10.0 SCR sounds optimistic with 70cc heads and 8cc pistons... you would need to be zero deck with a .039 4.166 (Fel Pro 1010) gasket to get 10.03SCR. Switching to 6cc pistons only gets you to 10.25... even a stock L98 cam will run fine on 93 octane with that compression ratio.
Depending on what rod you want to use Wiseco has some 7cc flat tops that are very affordable, around $450 a set including rings.
Will
Last edited by rklessdriver; Nov 17, 2017 at 05:00 PM.
Thread Starter
Drifting
Joined: Mar 2015
Posts: 1,275
Likes: 165
From: Utah
I am not sure how you are calculating DCR but thats a pretty high number for only 10.0 SCR.
Honestly 10.0 SCR sounds optimistic with 70cc heads and 8cc pistons... you would need to be zero deck with a .039 4.166 (Fel Pro 1010) gasket to get 10.03SCR. Switching to 6cc pistons only gets you to 10.25... even a stock L98 cam will run fine on 93 octane with that compression ratio.
Depending on what rod you want to use Wiseco has some 7cc flat tops that are very affordable, around $450 a set including rings.
Will
Honestly 10.0 SCR sounds optimistic with 70cc heads and 8cc pistons... you would need to be zero deck with a .039 4.166 (Fel Pro 1010) gasket to get 10.03SCR. Switching to 6cc pistons only gets you to 10.25... even a stock L98 cam will run fine on 93 octane with that compression ratio.
Depending on what rod you want to use Wiseco has some 7cc flat tops that are very affordable, around $450 a set including rings.
Will
if i could fimd some forged 8cc pistons i would be right where i need to be.
7cc pistons are closer, but not a huge difference in the numbers.
Maybe i need to entertain the idea of a cam swap, my current cam i replaced about 2 years ago...
Mostly I'm trying to talk my self into a 383 usimg my stock rods, adding a 383 crank, and new pistons.
Thread Starter
Drifting
Joined: Mar 2015
Posts: 1,275
Likes: 165
From: Utah
As my car sits it's a hoot to drive, i giggle every time i leave a black patch behind me...
I'm thinking stroking the thing will help it hit my converter that much harder.
when i did the build originally i was being told to keep the DCR below 8..
However it's possible they thought i still had the original heads...
I'm thinking stroking the thing will help it hit my converter that much harder.
when i did the build originally i was being told to keep the DCR below 8..
However it's possible they thought i still had the original heads...
Last edited by Gibbles; Nov 17, 2017 at 09:45 PM.
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Team Owner
Joined: Oct 2004
Posts: 81,241
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From: altered state
St. Jude Donor '05
Yes a qualified one otherwise they may ruin them
Look up Straussberg machine in UT they are incredible
email tpi421vette@comcast.net aka tpi421vette he will guide you. Trust me you want his help & will be glad you did.
Look up Straussberg machine in UT they are incredible
email tpi421vette@comcast.net aka tpi421vette he will guide you. Trust me you want his help & will be glad you did.
Last edited by cv67; Nov 18, 2017 at 10:35 AM.
Supporting Vendor
Joined: Oct 2004
Posts: 761
Likes: 68
Cr
Yes a qualified one otherwise they may ruin them
Look up Straussberg machine in UT they are incredible
email tpi421vette@comcast.net aka tpi421vette he will guide you. Trust me you want his help & will be glad you did.
Look up Straussberg machine in UT they are incredible
email tpi421vette@comcast.net aka tpi421vette he will guide you. Trust me you want his help & will be glad you did.
Thread Starter
Drifting
Joined: Mar 2015
Posts: 1,275
Likes: 165
From: Utah
Yes a qualified one otherwise they may ruin them
Look up Straussberg machine in UT they are incredible
email tpi421vette@comcast.net aka tpi421vette he will guide you. Trust me you want his help & will be glad you did.
Look up Straussberg machine in UT they are incredible
email tpi421vette@comcast.net aka tpi421vette he will guide you. Trust me you want his help & will be glad you did.
Melting Slicks
Joined: Dec 2008
Posts: 2,772
Likes: 64
From: Mystic CT
You used positive numbers for the piston that infers you want to reduce ccs in chamber / combustion space. Which one is it. With what you have is the compression too high or too low? If you have nothing with the 6.4 cc pistons what is the compression ratio (static please)
Thread Starter
Drifting
Joined: Mar 2015
Posts: 1,275
Likes: 165
From: Utah
You used positive numbers for the piston that infers you want to reduce ccs in chamber / combustion space. Which one is it. With what you have is the compression too high or too low? If you have nothing with the 6.4 cc pistons what is the compression ratio (static please)
+cc means its adding to the combustion chamber size.
Like a flat top piston with two or 4 valve reliefs.
-cc would be subtracting from the chamber size.
Like a piston with a dome on top sticking up.
Melting Slicks
Joined: Dec 2008
Posts: 2,772
Likes: 64
From: Mystic CT
You had me confused with what you are trying to do. I had thought you wanted to raise the static cr. 10/1 seems a bit low to me I would be thinking 10.75/1 and a bit more cam if even borderline serious. 11/1 would not terrify me unless a tpi.
Last edited by ddahlgren; Nov 18, 2017 at 03:33 PM.
Thread Starter
Drifting
Joined: Mar 2015
Posts: 1,275
Likes: 165
From: Utah
That high DCR has me worried, and i hate to spend more than i need to, however i would like a different cam that is a little more high rpm friendly.
With the heads i bought, i have to be careful to not go past .550 lift with out having the spring pockets machined (per edlebrocks instructions).
right now with the camshaft i have + the 1.65 roller rockers i have i'm @ .500 lift (or just a hair shy).
My heads are the e-street series, springs included have limitations...
I'm willing to spend the money, this car is totally my "happy place" right now... However i do want to watch the spending...
if the cost goes to high, i might have to hold off until the summer...
Melting Slicks
Joined: Dec 2008
Posts: 2,772
Likes: 64
From: Mystic CT
Yeah, i could have been a little more clear.
That high DCR has me worried, and i hate to spend more than i need to, however i would like a different cam that is a little more high rpm friendly.
With the heads i bought, i have to be careful to not go past .550 lift with out having the spring pockets machined (per edlebrocks instructions).
right now with the camshaft i have + the 1.65 roller rockers i have i'm @ .500 lift (or just a hair shy).
My heads are the e-street series, springs included have limitations...
I'm willing to spend the money, this car is totally my "happy place" right now... However i do want to watch the spending...
if the cost goes to high, i might have to hold off until the summer...
That high DCR has me worried, and i hate to spend more than i need to, however i would like a different cam that is a little more high rpm friendly.
With the heads i bought, i have to be careful to not go past .550 lift with out having the spring pockets machined (per edlebrocks instructions).
right now with the camshaft i have + the 1.65 roller rockers i have i'm @ .500 lift (or just a hair shy).
My heads are the e-street series, springs included have limitations...
I'm willing to spend the money, this car is totally my "happy place" right now... However i do want to watch the spending...
if the cost goes to high, i might have to hold off until the summer...
Thread Starter
Drifting
Joined: Mar 2015
Posts: 1,275
Likes: 165
From: Utah
Thread Starter
Drifting
Joined: Mar 2015
Posts: 1,275
Likes: 165
From: Utah
And the knock sensing is pretty good, while data logging i can see it picking up some bumps...
but i do have the iinfamous 84 Z51, drives like a gocart, and it will try and send you through the roof over bumps..
but i do have the iinfamous 84 Z51, drives like a gocart, and it will try and send you through the roof over bumps..
Burning Brakes
Joined: Oct 2012
Posts: 1,152
Likes: 252
Any suggestions on which piston manufacturer/
No manuf recommendation but just make sure to get full compression height, or better. Many "builder" pistons are .020 farther in the hole (shorter CH) than factory. The piston company assumes you are decking the block .020". If you run a piston with a shorter compression height not only will you loose a lot of compression but the quench will not exisit. you need around .030" quench for best power