Search



Go Back   MustangForums.com > Ford Mustang Tech > Classic Mustangs (Tech)
Sign in using an external account
Register Forgot Password?
Search

Classic Mustangs (Tech) Technical discussions about the Mustangs of yester-year.

Welcome to Mustang Forums!
Welcome to Mustang Forums.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
 
 
 
Thread Tools Search this Thread
Old 08-12-2011, 05:13 PM   #1
emttrevor
1st Gear Member
 
emttrevor's Avatar
 
Join Date: Nov 2010
Vehicle: 67 ford mustang
Location: oklahoma
Posts: 66
Default ADDING A SUPERCHARGER- AM I CRAZY OR NOT?

I bought myself a wieand 174 supercharger and I am thinking of putting it on my 67. I have a recently rebuilt short block not sure how well cause I bought this as a running car supposably its an 87 302 block it has dome shaped pistons but thats all I know Im thinking its probably bored 30 over since it was a rebuild, edelbrock rpm heads e303 cam 2500 stall c4 built tranny and 355 gears also will be running 670 holley street avenger carb. I dont know how to work out compression some say you need to be no more than 9.5 to run supercharger so Im guessing that mine is somewhere between 8.5 and 12 LOL .... My question is should I and also what would be the max rpm to run at before body parts go flying out..any thoughts or suggestions would be appreciated
This ad is not displayed to registered or logged-in members.
Register your free account today and become a member on Mustang Forums!
__________________
67 Stang, 347 Roller, WINDSOR JR heads and RPM intake, 770 street avenger carb, c4 and 3.55 POSI 8" rear
emttrevor is offline   Reply With Quote
Old 08-12-2011, 09:42 PM   #2
MustangFTW
Anime Club President

 
MustangFTW's Avatar
 
Join Date: Aug 2010
Vehicle: your mother
Location: MFOT
Posts: 1,381
Default

you should be able to run at 6-7k if your body is rust free and stiff
__________________
MustangFTW is offline   Reply With Quote
Old 08-12-2011, 10:32 PM   #3
emttrevor
1st Gear Member
 
emttrevor's Avatar
 
Join Date: Nov 2010
Vehicle: 67 ford mustang
Location: oklahoma
Posts: 66
Default

So you are talking about my car being rust free and stiff right? LOL As for my car its in one piece and pretty stiff, Ive done a lot of work on suspension, brakes etc added sway bars but I am really concerned about what my compression ratio may be and have no real way of telling since I didnt do the bottom end myself.... Most places I go say if I have 9.5.1 or more I'll blow the engine up I just have no idea on how to calculate it or if this is even a real concern or if its one of those "cover their corporate asses" type things where hey we told you not to do it. My guess is that I'm right around that ratio but I could be way off so if you or anyone can tell me a way to work it out or put my mind at rest by saying " hey its all bs" or even a "what ever just do it and c what happens if it blows it blows" then I'll go with the majority vote and go for it so I'd like as much imput as you guys can give me and appreciate the knowledge and/or been there done that info
__________________
67 Stang, 347 Roller, WINDSOR JR heads and RPM intake, 770 street avenger carb, c4 and 3.55 POSI 8" rear
emttrevor is offline   Reply With Quote
Old 08-12-2011, 10:39 PM   #4
andrewmp6
6th Gear Member
 
Join Date: Oct 2006
Location:
Posts: 8,162
Default

Its only a 671 blower its not going to add a ton of power it should be fine unless you drive it hard.
andrewmp6 is offline   Reply With Quote
Old 08-12-2011, 10:43 PM   #5
emttrevor
1st Gear Member
 
emttrevor's Avatar
 
Join Date: Nov 2010
Vehicle: 67 ford mustang
Location: oklahoma
Posts: 66
Default

k cool I appreciate your input. Just been freakin out a little since it arrived and concerned if I was making an expensive mistake
__________________
67 Stang, 347 Roller, WINDSOR JR heads and RPM intake, 770 street avenger carb, c4 and 3.55 POSI 8" rear
emttrevor is offline   Reply With Quote
Old 08-12-2011, 11:01 PM   #6
Iskwezm
4th Gear Member
 
Join Date: Feb 2006
Vehicle: 1965 Mustang Fastback
Location: So. Cal,the O.C.
Posts: 1,532
Send a message via Yahoo to Iskwezm
Default

You cant guess on your compression.You would need to know the pistons you have, if they are dished or domed and what cc.You would also need to know the chamber size of the heads,headgasket thickness etc.Say your at about 9.5-10:1,with about 5-7 psi which is what those blowers put out, your compression could be as high as 13:1.i wouldnt take that chance being that its your dime to fix it.Also i would NEVER spin a 174 past 55-6000 rpm,they arent made for that.Usually its about 15 hp per PSI of boost, but that also depends on how efficient your engine already is.
__________________
Sound Desicion Car Audio & Perf.
TMI Products.
Ford Cert./ASE Master Tech

2006 Mustang Gt 'Vert-12 sec. daily driver-sold
2006 F250 PSD,9"lift,37's on 20's,King coilovers,air ride,Gearheads 120hp tune,Phoenix Gold 6600 watts,4 12's
1965 FASTBACK- 18X8 18X9.5" TSW's 235/275 M/T's,
http://www.mustangandfords.com/featu...own/index.html
Iskwezm is offline   Reply With Quote
Old 08-13-2011, 09:34 AM   #7
emttrevor
1st Gear Member
 
emttrevor's Avatar
 
Join Date: Nov 2010
Vehicle: 67 ford mustang
Location: oklahoma
Posts: 66
Default

another question should i just go with holley carb i have or get a blow through type made for superchargers ive heard conflicting stories about that also. I dont mind spending the money just dont want to if I dont need to
__________________
67 Stang, 347 Roller, WINDSOR JR heads and RPM intake, 770 street avenger carb, c4 and 3.55 POSI 8" rear
emttrevor is offline   Reply With Quote
Old 08-13-2011, 10:39 AM   #8
Iskwezm
4th Gear Member
 
Join Date: Feb 2006
Vehicle: 1965 Mustang Fastback
Location: So. Cal,the O.C.
Posts: 1,532
Send a message via Yahoo to Iskwezm
Default

Quote:
Originally Posted by emttrevor View Post
another question should i just go with holley carb i have or get a blow through type made for superchargers ive heard conflicting stories about that also. I dont mind spending the money just dont want to if I dont need to
That is not a blow through blower.They do make blower carbs, but im not sure what is changed. When i had mine built for a blow through, it cost me about $900 bucks.
__________________
Sound Desicion Car Audio & Perf.
TMI Products.
Ford Cert./ASE Master Tech

2006 Mustang Gt 'Vert-12 sec. daily driver-sold
2006 F250 PSD,9"lift,37's on 20's,King coilovers,air ride,Gearheads 120hp tune,Phoenix Gold 6600 watts,4 12's
1965 FASTBACK- 18X8 18X9.5" TSW's 235/275 M/T's,
http://www.mustangandfords.com/featu...own/index.html
Iskwezm is offline   Reply With Quote
Old 08-13-2011, 11:10 AM   #9
JMD
6th Gear Member
 
JMD's Avatar
 
Join Date: Jan 2007
Vehicle: 39 Ford
Location: AR
Posts: 5,468
Default

I am going to admit to not supercharging anything of my own, but I have done a bit of research on this because I have always thought it would be way cool to do so.

IMO, if a person wants to supercharge an engine, this engine needs to be BUILT for this purpose from the beginning. If I were to supercharge anything, (even with a mild setup), I would start with a steel crank (cast steel or forged depending on boost), forged pistons, H-beam rods, no more than 8 to 1 CR, (probably lean more to about 7.5 to 1 or even a touch lower) and almost certainly a roller cam with good lift but not super aggressive duration.

I would also build the engine to make power at no more than 5,000 or 6,000 RPM. In other words, I would build a STOUT but MILD engine, and make up the difference with the charger.

IMO cast or hyper pistons and/or a cast iron crank with a blower is just asking for trouble, the problem with detonation on a blower motor is not "IF", it is when. Be ready for it when it happens. A stock or near stock rotating assembly would imo be a huge risk.

If you are going to do this, I would at least want to KNOW the makeup of the engine so I could attempt to properly compensate for the parts that are not ideal for your blower.

A bit of self education will go a long way BEFORE you slap that blower on.

Oh yea, the Holley carb will need to be modified because the power valve (and some other things) won't work right. Whatever you do with a blower, the A/F mixture MUST not EVER go lean, carb (and fuel system) preparation is paramount.
__________________
Building cars is EASY, building cars right is a mite bit harder.


Last edited by JMD; 08-13-2011 at 11:15 AM.
JMD is offline   Reply With Quote
Old 08-13-2011, 11:56 AM   #10
ozarks06
2nd Gear Member
 
ozarks06's Avatar
 
Join Date: Dec 2005
Vehicle: 1965 Ford Mustang
Location: MO
Posts: 439
Default

Quote:
Originally Posted by JMD View Post
I am going to admit to not supercharging anything of my own, but I have done a bit of research on this because I have always thought it would be way cool to do so.

IMO, if a person wants to supercharge an engine, this engine needs to be BUILT for this purpose from the beginning. If I were to supercharge anything, (even with a mild setup), I would start with a steel crank (cast steel or forged depending on boost), forged pistons, H-beam rods, no more than 8 to 1 CR, (probably lean more to about 7.5 to 1 or even a touch lower) and almost certainly a roller cam with good lift but not super aggressive duration.

I would also build the engine to make power at no more than 5,000 or 6,000 RPM. In other words, I would build a STOUT but MILD engine, and make up the difference with the charger.

IMO cast or hyper pistons and/or a cast iron crank with a blower is just asking for trouble, the problem with detonation on a blower motor is not "IF", it is when. Be ready for it when it happens. A stock or near stock rotating assembly would imo be a huge risk.

If you are going to do this, I would at least want to KNOW the makeup of the engine so I could attempt to properly compensate for the parts that are not ideal for your blower.

A bit of self education will go a long way BEFORE you slap that blower on.

Oh yea, the Holley carb will need to be modified because the power valve (and some other things) won't work right. Whatever you do with a blower, the A/F mixture MUST not EVER go lean, carb (and fuel system) preparation is paramount.
Good advice. To get the most out of a blower, you need a motor built both to handle the boost, and built to make power with boost. I would stay with about 8:1 - 8.5:1 for a roots type blower on a SBF. It will make lots of boost at low RPM so you will end up with high static pressures, equivalent to about 12.5:1 - 13.5:1 compression. You will definitely have to watch the mixture and timing. You also normally want a mild, if not stock, cam for a blower motor. Typical N/A performance cams have too much overlap and you'll just blow boost (and fuel) out the exhaust valve while both valves are open (the smooth idle is also good for fooling the 'fools' at the stoplight).

Whatever you do, do your homework (Supercharging, Turbocharging & Nitrous Oxide Performance Handbook by Earl Davis et al is a good place to start), and make sure you have it tuned by someone who knows supercharging and does it on a dyno. Too much spark advance at the wrong RPM/load or a lean condition can destroy your engine almost instantly (like less than 2 seconds at WOT - boom!). Blowers are great but they place enormous stress on the engine components (and the drivetrain too).
__________________
Plain Jane 65 Coupe - 284 ci with virtual displacement enhancer
Feature Car in December 2010 StreetScene (the magazine of the National Street Rod Assoc)

Last edited by ozarks06; 08-13-2011 at 11:58 AM.
ozarks06 is offline   Reply With Quote
Old 08-13-2011, 11:56 AM
MustangForums
Ford Mustang




Paid Advertisement

 
 
 
Reply

Tags
174supercharger, 302, 670, avenger, cast, crank, ford, heads, jr, supercharger, supercharging, windsor, work

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Advertising

Featured Sponsors
Vendor Directory
New Sponsors
All times are GMT -5. The time now is 04:06 AM.

© Internet Brands, Inc.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.

This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company
Emails Backup