|
Author
|
Topic: 408W Build question
|
ChadRockCapri
Journeyman Posts: 38
From: Hicksville, OH USA
Registered: Jan 2005
|
posted 04-23-2006 09:01 AM
   
Been researchin over and over again about my very near future 408w build. Question I have is how high i can bring up the compression ratio and still be safe with pump gas. Plan on using vic jr head/intake and SteveW said to use the Comp 282S cam for the build.. Plan on using either victor reinz or cometic head gaskets which will obviously affect compression ratio of pistons. I know the rule of thumb is around 10-1 for pump gas but just wondered how far it could be taken with the aluminum heads and the cam. Used the search for quite awhile and found a lot of answers but just figured i'd ask you guys to see what you think with this combo.. Thanks... 
IP: Logged |
66-408-stang
Journeyman Posts: 71
From: lafayette, in usa
Registered: Nov 2000
|
posted 04-23-2006 09:18 AM
You could probably go a little higher if you plan on 93 octane and build for maximum quench. Getting true 93 reliably may be the problem. In my area either the 93 is not selling fast enough and going bad or the stations are actually pumping 87. Because of the gas quality I would stick close to 10 and a 035-040 quench (steel rods). But because of questional gas
IP: Logged |
393Bird
Gearhead Posts: 186
From: Clarksville Tn.
Registered: Feb 2004
|
posted 04-23-2006 09:59 AM
I do not know how close you are to any of these town listed, but if reasonable close, you may want to consider converting over to E85 Ethanol. It runs berween 105-108 octane, and runs about what 87 octane cost. Using in a carbed setup also cools the incoming air as it passes through the carb, which frost up some. It has most of the advantages of menthanol, but not many of its draw backs. I am adding a supercharger to my 393, and switching to E85 so I can run it on the street with 15 lbs boost. ------------------
1993 Tbird
393 stroker, 3500 RPM TCS converter, Lentech Strip Terminator http://members.tccoa.com/392bird/
IP: Logged |
CometGT1974
Gearhead Posts: 466
From: Asheville, NC USA
Registered: Jan 2002
|
posted 04-23-2006 02:47 PM
I'm curious, what is involved in switching a vehicle (whether FI or carb.) over to E85??
IP: Logged |
FSTBK65
Gearhead Posts: 368
From: Salem, Virginia 24153
Registered: May 2004
|
posted 04-23-2006 07:11 PM
I am also curious about what needs to be done to switch. I have a carb / supercharger setup.
Thanks------------------
65 fastback. 302, Paxton Supercharger 7PSI, Edelbrock heads and intake, comp cam, Motorsport rockers,flowtechs with cutouts, x pipe and 2.5in flowmasters. Subframe connectors and shelby traction bars. 4 speed, hurst shifter,Zoom clutch. 368hp and 378ft lbs at the wheels on pump gas. 8.01 @ 87.72 mph 1/8 mi with a 1.78 60ft.
IP: Logged |
JJonesy99
Gearhead Posts: 184
From: Lakewood, CO USA
Registered: Jan 2005
|
posted 04-24-2006 01:05 AM
I have a 408w with 10.5 compression. In Colorado our premium is only 91 octane, so thats what I run. I have Vic Jr heads, rpm manilfold, cam specs: .555/.575 & .238/.242. My car is daily driven and I've had NO problem with my compression.Jason ------------------
66' stang
408W, C4, 4.11 gears
11.94 1/4 @113mph @ 5,800 elevation
367 RWHP & 373 RWTQ
DAILY DRIVER
IP: Logged |
steve'66
Gearhead Posts: 9664
From: Sonoma,CA,USA
Registered: Mar 2000
|
posted 04-24-2006 05:53 PM
quote:
Originally posted by CometGT1974:
I'm curious, what is involved in switching a vehicle (whether FI or carb.) over to E85??
Check this out, http://xcelplus.com/e85/article.htm SteveW
IP: Logged |
Quarter Horse
Journeyman Posts: 16
From: Kansas
Registered: Oct 2005
|
posted 04-24-2006 06:33 PM
The rule of thumb I've heard when running aluminum heads is 10.5:1 static CR. As someone else said make sure your quench distance is correct. That will help eliminate "hot spots" in in the cylinder. I recently completed my 393W. It's static CR is 10.7:1, AFR 205 heads, and Comp 286/292 solid roller cam. I run on 92 Octane just fine. The real question is what is your dynamic CR. That can be dificult to estimate, but basically bigger cams with more overlap have lower dynamic CR. With the cam you are considering, I suspect you would be fine if you keep your static CR below 10.5:1. What pistons are you considering? Probe makes a couple different dished pistons (I think a 15cc and 30cc) that can help you adjust your CR.
IP: Logged |
393Bird
Gearhead Posts: 186
From: Clarksville Tn.
Registered: Feb 2004
|
posted 04-24-2006 08:56 PM
Here is some good information on using E85 in boost applications. http://www.turbomustangs.com/smf/index.php?topic=47094.0
IP: Logged |
Mustangsandmore Forums
