How Much Compression for a Stroker?
#265801
03/25/09 02:42 AM
03/25/09 02:42 AM
|
Joined: Jun 2006
Posts: 5,166 CT
GTX MATT
OP
master
|
OP
master
Joined: Jun 2006
Posts: 5,166
CT
|
Just a question for a stroker, say a 500 or 511, if running a cam with 250ish degrees duration at .050, how much compression do you think would be safe for pump gas? And how much compression do you think it would take to give good results with a cam like that in the 500 cube stroker?
Looking for a cam that will work well with a stockish stall (2500) converter and 3.23 gears.
Last edited by GTX MATT; 03/25/09 02:47 AM.
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
|
|
|
Re: How Much Compression for a Stroker?
[Re: n_bogie1984]
#265804
03/25/09 08:20 AM
03/25/09 08:20 AM
|
Joined: Jan 2003
Posts: 16,123 Grand Haven, MI
patrick
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
|
11-11.5:1 with tight quench and AL heads, no problem on 93.
1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!*** 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
|
|
|
Re: How Much Compression for a Stroker?
[Re: DaytonaTurbo]
#265806
03/25/09 11:53 AM
03/25/09 11:53 AM
|
Joined: Jun 2006
Posts: 5,166 CT
GTX MATT
OP
master
|
OP
master
Joined: Jun 2006
Posts: 5,166
CT
|
It would be using iron heads for the time being, aluminum when the budget allows.
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
|
|
|
Re: How Much Compression for a Stroker?
[Re: GTX MATT]
#265807
03/25/09 12:02 PM
03/25/09 12:02 PM
|
Joined: Jan 2007
Posts: 160 Florida
hemisurfer
member
|
member
Joined: Jan 2007
Posts: 160
Florida
|
You can go with more compression with aluminum up to 11.5 max and that is pushing it. The iron heads much less. I would keep it at 10.5 max with the iron and again that's pushing it. Keep an eye on your timing if you get any detonation, less is better with todays cruddy gas.
Chris
|
|
|
Re: How Much Compression for a Stroker?
[Re: BELVEDERE67]
#265809
03/25/09 12:21 PM
03/25/09 12:21 PM
|
Joined: Jun 2006
Posts: 5,166 CT
GTX MATT
OP
master
|
OP
master
Joined: Jun 2006
Posts: 5,166
CT
|
Wow, this is at least a full point more than I expected, with 500 cubes I figured 9.5:1 would be pushing it with iron heads and 93. Keep the comments coming, im trying to sqeak by with upper 9s or lower 10s with the irons so that I can be in the mid to upper 10s when I go aluminum.
And for the best quench, I guess the easiest way would be zero deck and .039 inch head gasket?
What if I do not have good quench and am, say, .020 in the hole to make things more realistic.
Last edited by GTX MATT; 03/25/09 12:27 PM.
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
|
|
|
Re: How Much Compression for a Stroker?
[Re: GTX MATT]
#265814
03/25/09 07:03 PM
03/25/09 07:03 PM
|
Joined: Feb 2005
Posts: 4,318 Prospect, PA
BSB67
master
|
master
Joined: Feb 2005
Posts: 4,318
Prospect, PA
|
Quote:
It would be using iron heads for the time being, aluminum when the budget allows.
You know that you'll need to be a little creative to do this and have both good quench and reasonable CR under these two conditions with out changing pistons - right?
I would not go over 10.5 CR with aluminum heads, based on what you describe for your combination.
|
|
|
Re: How Much Compression for a Stroker?
[Re: BSB67]
#265815
03/25/09 07:48 PM
03/25/09 07:48 PM
|
Joined: May 2007
Posts: 430 New Hampshire
n_bogie1984
mopar
|
mopar
Joined: May 2007
Posts: 430
New Hampshire
|
i still think your all nuts just entered my specs and this is what i got 499.1 ci 8.18 lifter 13.76 to 1 static 10.46 to 1 dyna off 93 oct, 34 deg timing and 915 heads
Last edited by n_bogie1984; 03/25/09 08:27 PM.
|
|
|
Re: How Much Compression for a Stroker?
[Re: ahy]
#265818
03/26/09 12:25 AM
03/26/09 12:25 AM
|
Joined: Jun 2006
Posts: 5,166 CT
GTX MATT
OP
master
|
OP
master
Joined: Jun 2006
Posts: 5,166
CT
|
Sorry guys didnt specify, they are 516 closed chambers. I know I know, they wont work well but they have a fresh valve job and I cant see dropping the dough for machine work on a set of 906s and the price of cores for something that will get changed a year later.
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
|
|
|
Re: How Much Compression for a Stroker?
[Re: RapidRobert]
#265820
03/26/09 12:58 AM
03/26/09 12:58 AM
|
Joined: Jun 2006
Posts: 5,166 CT
GTX MATT
OP
master
|
OP
master
Joined: Jun 2006
Posts: 5,166
CT
|
Quote:
Closed chambered 516's now and are you going to closed chambered alum ones when you switch(hope so) & if so are the cc's of the 2 close enough that you can get your CR where you want it now & have it pretty much the same when you switch to alum heads & you'll still have your quench(if you get it now) & if the cc's are radically different & you're switching in a year I'd get the CR where you want it based on the cc's of the upcoming swap
Yes I think the compression will be pretty close, what does a 516 chamber cc at, 83-85? I know 78 is what its supposed to be, but thats blueprint spec.
Also, the compression ratio options are slightly different if I run a 493 or a 505, what are the disadvantages to the 505? It has smaller Chevy rod mains, is that something to seriously consider? It will be a street driven engine, flooged quite a bit, and will see the strip to see what it runs and tune it to get the best results and have fun.
The difference in stroke is only .1 inch, I couldnt imagine im comprimising much in durability. But at 6000 rpm, is it really going to make a difference or no? Its only 12 cubes, but 12 cubes is 12 cubes.
Should I just pick the one that yeilds me the compression I really want?
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
|
|
|
|
|