Will my 347 stroker work with my speed density?

[ramjetlx]

Im finally throwing in a 347 stroker after snapping my crank a few months ago. I still have the speed density setup and was wondering will it be compatible? If not, what can I do besides switching to MAS? Thats about $600 from FMS, plus Im would change the MAS to a bigger one and to also be compatible with 24LB injectors,as well as the piping. I really dont wanna spend alot of money to upgrade to a MAS. So do I have an alternative to sticking with my current SD? My H/C/I is still stock, but in about 6 months they should be all replaced. Any advice is greatly appreciated.

 

[Daggar]

If it were me and I were tight on money, I'd put it all back together with the 19s and see if it were enough injector to power it all. My initial inclination is that the 19s will be fine. It's really the cam and heads that are most important here. It should all run very well. You should notice 'some' additional power from the freshened block and extra displacement but don't expect a miracle.

Run that combination for a while an gradually put together your own MAF conversion. The FMS kit is turnkey but it's also pretty small.

 

[ramjetlx]

Thanks for your advice. Do you know where I could just buy a stock MAS computer and then buy the MAS meter and pipes seperately? I agree with you that the FMS kit is small for my future upgrades....

 

[304billet]

My 347 stroker had 24lb inj, 70mm TB, 73mm MAS and a custom burned chip. Remember ur stock computer still thinks the engine is a 302ci and u run the risk of running too rich, washing out the rings or too lean, burning a piston, when the air/fuel ratio is not correct. I did not get a chip burned for the 347 until about 3 years later after it was built and when the air/fuel was done it was not that far off. But at least do the 24's and a MAS bigger than ur TB.

Since u have not built it yet, consider a Scat 4340 forged steel profiled crank, Scat 4340 H-beam rods w/ L-19 upgrade, 9:1 comp forged pistons to throw a blower on later, Comp Cam XE282HR, SVO Z304 aluminum heads, Canfield 192's or AFR 205's and a port matched TFS Track Heat, Holley, or Performer ll intake.

My old 347 stroker with ported AFR 185 heads, ported Downs lower and upper, a Comp cam XE282HR and 30lb inj, put down 400rwtq and 400 rwhp, NA

 

[Daggar]

Ebay! I got mine for $95 including the shipping. You can get the wires and pins from http://fordfuelinjection.com/index.php?p=21 and conversion instructions can be found http://www.stangnet.com/tech/maf/massairconversion.html

Lemme know if you need sources for various couplers etc. Most folks just get an aftermarket CAI, the meter they want, then do the conversion.

Good Luck!

 

[Daggar]

My 347 stroker had 24lb inj, 70mm TB, 73mm MAS and a custom burned chip. Remember ur stock computer still thinks the engine is a 302ci and u run the risk of running too rich, washing out the rings or too lean, burning a piston, when the air/fuel ratio is not correct. I did not get a chip burned for the 347 until about 3 years later after it was built and when the air/fuel was done it was not that far off. But at least do the 24's and a MAS bigger than ur TB.

I doubt that this will be an issue with the stock H/C/I. My only concern might be running out of injector at the top of the RPM range and I don't think that that's going to happen with the stock heads and cam.

 

[2000xp8]

Get the maf setup. You will be playing with fire without it.
Ya, it can work out for you without it, but on the other hand, it may not, and i wouldn't risk a $2500 shortblock on it.

 

[304billet]

I doubt that this will be an issue with the stock H/C/I. My only concern might be running out of injector at the top of the RPM range and I don't think that that's going to happen with the stock heads and cam.

Why would anyone build a 347 stroker with stock heads and cam, that is just plain stupid, Daggar!!!!!!!!!!!!!!!

 

[Daggar]

Get the maf setup. You will be playing with fire without it.
Ya, it can work out for you without it, but on the other hand, it may not, and i wouldn't risk a $2500 shortblock on it.

I would have to disagree. SD is no less capable than MAF of handling that combo. Again, my only slight concern would be on a "maybe" as to whether the injector size might be an issue with the additional displacement. The thing that enters my mind on that detail though, is that even though the motor is slightly larger and capable of more air, the heads and cam are not. In other words:
My thought is that the H/C/I is still going to be the bottle neck in the combo, not the injectors.

If it comes down to a point where larger injectors and a custom tune is required, then I would certainly put that money towards tuning a MAF setup as opposed to SD. There's allot more support for MAF unless you happen to be running a stand alone AEM ECU or something of that nature.

 

[Daggar]

Why would anyone build a 347 stroker with stock heads and cam, that is just plain stupid, Daggar!!!!!!!!!!!!!!!

read the original post. My suggestion was not a permanent one. Just a "hold me over" until he can afford to get those parts necessary for his plans down the road. Why spend money on the FMS conversion kit when the only things out of that kit that will be usable after the H/C/I is installed are the computer and harness? The other parts will be inadequate.

My H/C/I is still stock, but in about 6 months they should be all replaced. Any advice is greatly appreciated.

 

[2000xp8]

See, i think the car is going to have driveability issues with all those cubes, and no air feeding them.

Probably make alot of torque and no hp. Along with idling like crap.

 

[88_GT_5_oh]

like said the mass air conversion is the way to go... i did mine for like $150 canadian (thats like $5 US or something) plus i bought a c&L meter and I used taurus electronics on top of the C&L since it doesn't come with them. the plug can be taken for a taurus for example, and the pins for the computer can be taken from a 4 banger stang. then use the instructions on this site and you can't go wrong. plus the car "should" run better.

if it were me i would try the stock injectors like dagger says cuase of the stock HCI. but that may be pushing the injectors right to the edge

 

[sn9550]

I'm in the middle of my mass air conversion now. I didn't need to convert but I'm going to add an S-trim pretty soon so I'm just preparing for that.
I agree with Dagger that your stock inducted 347 will probably work with SD. I would also start collecting the parts for the MAF conversion. I got my computer and harness off ebay and the meter from a friend. For couplers and pipe try www.racepartsolutions.com.

 

[ramjetlx]

Thanks for the advice everyone. I already purchased the stroker from CHP, right now its getting balanced. I do agree the stock H/C/I is too small for a 347, thats why I plan to upgrade them soon. I know its going to be expensive regardless of what I do, I just need something to hold me over for awhile till I can decide which is the best option for me. Would it be alright to run my nitrous system with the stroker or am I pushing my luck?

 

[88_GT_5_oh]

is this your only car? cause if you have a daily i'd say wait it out and get the HCI before breaking in that 347. but thats just me. i don't know much about nitrous but if you are gonna stick with those 19's it may be a little risky

 

[Daggar]

Thanks for the advice everyone. I already purchased the stroker from CHP, right now its getting balanced. I do agree the stock H/C/I is too small for a 347, thats why I plan to upgrade them soon. I know its going to be expensive regardless of what I do, I just need something to hold me over for awhile till I can decide which is the best option for me. Would it be alright to run my nitrous system with the stroker or am I pushing my luck?

Hold on on the nitrous until you can afford to get it properly tuned.