okay. the best info i can give about the compression ratio and the pistons is that the block was built by ford strokers.com. i just visited the web site. it says that flat top pistons yield a 10:1 compression ratio on a 331 and dish top pistons make it a little lower. i believe i have dish top pistons (the ones that have the top of the pistons cut out a little and its shaped like a valve) i guess the next step really is to determine the cost. i would like to boost it and if that means changing the cam that is fine. does anyone know where i can get a 6 psi supercharger for less than 3,000? i dont wasnt one thats junk, but it might be nice to spend a little less. vortech has a kit for 3,000 but i think it comes with injectors and a fuel management unit, plus all the pulleys and everything to install.
how much horsepower?
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Lots of people have run turbo stock blocks. Might be a little overkill in your situation though. You can find some pretty good deals on used kits on ebay. Just make sure it's got all the bits. If you end up having to buy a few pieces seperately, it could end up costing more than a new kit. The full kit with the injectors from Vortech is not going to help you. It has enough injector to run a blower on a stock engine which isn't going to be enough with your added displacement and heads. And the FMU is the device of satan. They are notoriously unreliable and hard to tune. Much better to go with a larger injector size, and a good tune on the computer and skip the FMU all together.
You might have dish pistons, but don't mistake the dips in the piston for a dish. Those dips may just be valve reliefs, which all pistons are going to have.
Kurt
You might have dish pistons, but don't mistake the dips in the piston for a dish. Those dips may just be valve reliefs, which all pistons are going to have.
Kurt
well we specifically asked for dish top to allow for that big cam. what size injectors should i get and how much boost would you recommend? and as far as the cam goes.. should i just pick out a supercharger set up and tell one of the guys you recommend what i am running and just have him grind one?
Dish top would be preferrable. You want to have the compression ratio as low as practical for a blower. I would say 6psi is all you're going to need. Maybe 8psi at the most. I'd recommend a T-trim or better. An S-trim would get you buy, but with that much displacement, the air charge will be hotter. I'm not specifically recommending a Vortech blower, they are all pretty good. Just that it has the trims people are most familiar with for Mustangs. Probably looking at 36lb/hr or 42lb/hr injectors for 8psi on that engine. Somewhere in that range.
As for your second question you are on the right track. Pick the supercharger you want, and then let the cam guy know. If you are getting a custom grind, they will be able to make it work specifically for your blower combination. They are going to want to know the flow numbers for the heads. If they are stock Trick Flow Heads, you can get the flow numbers off the Stan Weiss flow chart. Since you are probably going to be over 9:1 compression on the engine, it's a good idea to get a good intercooler, but not absolutely necessary. Make sure it's an air to air intercooler for a streetcar. Don't get tangled up into those air to water to air sales pitches.
Stan Weiss chart
http://users.erols.com/srweiss/tablehdc.htm
Kurt
As for your second question you are on the right track. Pick the supercharger you want, and then let the cam guy know. If you are getting a custom grind, they will be able to make it work specifically for your blower combination. They are going to want to know the flow numbers for the heads. If they are stock Trick Flow Heads, you can get the flow numbers off the Stan Weiss flow chart. Since you are probably going to be over 9:1 compression on the engine, it's a good idea to get a good intercooler, but not absolutely necessary. Make sure it's an air to air intercooler for a streetcar. Don't get tangled up into those air to water to air sales pitches.
Stan Weiss chart
http://users.erols.com/srweiss/tablehdc.htm
Kurt
I also should mention a Kenne Bell style blower since they are are becoming more popular. If this is primarily used on the street, it's a consideration. The Kenne Bell will give you more low end grunt on the street, which some people prefer. If you are looking for more peak power, and better performance at the track, a Centrifugal would be preferrable. The centrifugal takes less power to turn, which will allow you to get more out of your engine with less risk to damaging it. It is also more efficient, and the air charge is cooler, which allows you to get bigger numbers with pump gas, which is a consideration on an engine with over 9:1 compression. However, it doesn't deliver as much boost at low rpm as the Kenne Bell.
Kurt
Kurt
You don't need boost or new (bigger) heads to make 500 flywheel hp with a stroker. You'd be surprised what unported TW heads can do with the RIGHT combo.
What are your goals for the combo and do you know your appx compression?
What are your goals for the combo and do you know your appx compression?
my goal at this point is 11.5 or less in quarter mile. i have not had it at the track, or had it dynoed or tuned because i dont want to pay to have it tuned and not be where i want to be and then add something else and have it tuned again. when i tune it i am done. as i said according to woody at fordstrokers.com my ratio is less than 10:1 i had my heads milled because they were scratched up. that took .006 off. i have flycut pistons not dish top. im an idiot. i would have to guess its like 9.5:1 or so but i just don't know. i can take the stuff apart and rebuild all day, but i dont know the real in depth stuff like that. im basically a mechanic working with moderate salary and i want to have a 15,000 dollar car that can bury someones corvette or their saleen. you get the idea.... im sure im not the only one that wants to show up someones expensive car that they bought fast out of the box and never had to touch it. i have a buddy from work who hangs out with rich kids and one has a bmw (not sure what kind) another has a charger srt another a 2010 camaro ss another a gto he claims has 600 horses. i would love nothing more than to smoke them with my ugly paint faded 94 mustang. lol
kurt i have lots of thinking to do. you guys have informed me a lot because here i was thinking i had 490 horses and i was ready to tune it and call it done. basically it will be next spring before i can really do anything. i will have to decide at that point if i wanna supercharge it or try something else. i really appreciate all the input from everyone
Pops Fun
10 Year Member
Hi
I have a vortech sq, with a 347ci, dished pistons, tw ported heads., 42lb injectors, steeda 19 cam, corba intake and make 507 hp. A new dart block. Running about 10 lb of boost.
I would stay below 500rwhp with the stock block, I blew mine up last fall running 526rwhp after 4 years of hard use.
My son has about the same setup 331ci with smaller pulley and a better fuel stuff.... lines, 60# injectors etc. Makes 573rwhp
Going to 60lb injectors and smaller pulley this winter
Hope this helps Steve
I have a vortech sq, with a 347ci, dished pistons, tw ported heads., 42lb injectors, steeda 19 cam, corba intake and make 507 hp. A new dart block. Running about 10 lb of boost.
I would stay below 500rwhp with the stock block, I blew mine up last fall running 526rwhp after 4 years of hard use.
My son has about the same setup 331ci with smaller pulley and a better fuel stuff.... lines, 60# injectors etc. Makes 573rwhp
Going to 60lb injectors and smaller pulley this winter
Hope this helps Steve
Pops Fun
10 Year Member
Last year making 526rwhp I put slicks on it and ran a 11.6
http://popsfun.com/mustang/11_696 copy.jpg
here is kind of a history of what I did: Dyno Page
That compression ratio is probably to much for a supercharger... you might get by with a thicker head gasket but that is not optimum. i did that on my last build....
http://popsfun.com/mustang/11_696 copy.jpg
here is kind of a history of what I did: Dyno Page
That compression ratio is probably to much for a supercharger... you might get by with a thicker head gasket but that is not optimum. i did that on my last build....
As this thread has developed I see several things to think about 
If you are gonna force down the mix ..........
your parts selection is not as critical as when going NA
besides that fact
You are gonna use the OEM block
threfore
You WILL have to deal with its limitations of around 450 to the wheels
You will wanna go with no less that 42's for inj's
and
You might need larger so be sure to do the necessary research
As was said above ... amount of boost really doesn't mean a whole lot
If you have good flowing stuff your boost will be lower due to less
restriction to airflow and no matter if NA or Boosted ..............
That is always a good thing :Word:
If you have more compression than most would say is ideal
That don't mean you can't boost it
You just have to be realistic and keep the boost down to reasonable
levels
You should not have a cam with a good amount of overlap if going boosted
as it will blow away most of the charge from low to mid range levels
A cam change out is not all that bad
Grady
If you are gonna force down the mix ..........
your parts selection is not as critical as when going NA
besides that fact
You are gonna use the OEM block
threfore
You WILL have to deal with its limitations of around 450 to the wheels
You will wanna go with no less that 42's for inj's
and
You might need larger so be sure to do the necessary research
As was said above ... amount of boost really doesn't mean a whole lot
If you have good flowing stuff your boost will be lower due to less
restriction to airflow and no matter if NA or Boosted ..............
That is always a good thing :Word:
If you have more compression than most would say is ideal
That don't mean you can't boost it
You just have to be realistic and keep the boost down to reasonable
levels
You should not have a cam with a good amount of overlap if going boosted
as it will blow away most of the charge from low to mid range levels
A cam change out is not all that bad
Grady
Again the value of boost is dependent upon parts used
Lets talk about two extremes to show the idea here
1) Stock GT setup
2) Nice flowing aftermarket heads and intake
Does it make sense if you apply the same pressure to both setups
the little stock combo is gonna offer more resistance to airflow
therefore making for sake of discussion like 8 - 10 lbs of boost
Do the same on example 2 and you will certianly drop some boost
cause air flows better through the aftermarket stuff
See how a lower value here is not necessarily a bad thing
You should not just up the pressure with a smaller pulley without
some thought
This is one of those things that kinda goes contrary to what you
here a lot of people talk about but if you think about it logically
OR as they say ... think outside of the box ... you have to do
a bit of considering no matter what the masses say
I'm no expert on PA combos for sure
Myself and others here are just trying to offer ideas to get you
started to consider, and research to see what your options
might be
Grady
Lets talk about two extremes to show the idea here
1) Stock GT setup
2) Nice flowing aftermarket heads and intake
Does it make sense if you apply the same pressure to both setups
the little stock combo is gonna offer more resistance to airflow
therefore making for sake of discussion like 8 - 10 lbs of boost
Do the same on example 2 and you will certianly drop some boost
cause air flows better through the aftermarket stuff
See how a lower value here is not necessarily a bad thing
You should not just up the pressure with a smaller pulley without
some thought
This is one of those things that kinda goes contrary to what you
here a lot of people talk about but if you think about it logically
OR as they say ... think outside of the box ... you have to do
a bit of considering no matter what the masses say
I'm no expert on PA combos for sure
Myself and others here are just trying to offer ideas to get you
started to consider, and research to see what your options
might be
Grady
Agreed. 10.5:1 is getting a little too high for boost and pump gas. Go nitrous instead.
Kurt
okay. new question. i found trick flow heads to support my cam, they are twisted wedge 205 intake runner 65 combustion chamber part TFS-51400010-C02. currently i have 170 intake and 61 combustion chamber part TFS-51400004. again.. my cam .574/.595 part number TFS-51402002, my intake is trick flow track heat part TFS-51511002. my question.. lets forget super charger for now.. will i be best off to port my current heads(about $600) or buy these bigger heads and sell my old ones? and.. if i replace the heads... do i need to port the intake.. or will that intake flow what i need to flow? or is there an intake that will flow what i need to flow? seems like the best course of action is to stay na and add a shot of nitrous if i still have a need for speed.
I'd go for the bigger heads. Porting your old heads isn't going to have that much yield. I think since we found the compression to be a little on the high side, we're back to square one. Not sure what you're going to have to do with that intake. Might need a bigger intake altogether. Once you get to a head that big, you have to stop thinking "out of the box." Heads that big are designed to be customized. I'd at least get a good valve job done on those heads before they go on the car.
Kurt
Kurt
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