390 .060 over,330 ft crank, 10 to 1 comp, 750 double pumper holley,
biggest cam I can fit in, Stock dizzy w/ petronix upgrade,single
plane intake of some type, headers, ported c8aeh heads with cj valves,
2-1/2" dual exhuast.Big thanks to the person who takes the time!
then run that setup with a 390 crank. thanks agian.





e power

 

With a 330 crank ?!! Why on earth would you build a nice engine and then cripple it with such a lame crank ? A stock 390 with a 3.78 stroke is going to be able to laugh at you, regaurdless of what you do with the little-cranked engine. You'll be giving away at least 100ft-lbs of torque all acrss the rev range. DF

 

DF,

I have read many of your posts and realize that you are quite knowledgable. However, the guy said "390 .060 over,330 ft crank". He may have meant a 332 FE crank (if this is teh same guy that wanted to build the "rat FE". If this is the case, then yes, he would be sacrificing a lot with a 3.30" stroke. However, from what he said, he would be using a 3.50" stroke crank (330 FT's are basically 361 FT's with a smaller bore, and are not FT versions of teh 332 FE). Now, Ford used this crank in NASCAR motors (ie. the "396" - 4.23" 427 block w/ 3.5" 361 steel crank) and it would make equivalent horsepower as the 427 except at a higher RPM. I don't have one of those programs, but I strongly feel that a motor built like this would perform very well at higher RPMs. Granted it would not have the low end grunt of a 390, but if built right and geared right, might just beat one in a race that utilized it's RPM.

Again, DF, I don't want you to think that I am being disrespectful, I am just challenging your assumptions.

Respectfully,
Nathan

PS: I'm not bashing you, so please don't beat me

 

it's not gonna be a truck motor so I don't care
for low end, my buddys car can barely pull itself
onto a hoist....but it'll pull past 5 cars with the speedo
buried at 120mph, I want the engine to start pulling hard
at 2800 or so then max out at 5000-5500 cause I'm gonna
build a good capable passing car.

Fe power

 

Here ya go. This is with a crane 341191 solid flat tappet. This will probably be my next cam.


http://www.clubfte.com/users/ratsmoker/BBPcomp.gif

 

I also specified to run that desk top dyno with
a 390 crank so I could compare the curves. Try not
to bash any ideas without reading first, thanks.




Dory

 

MMMMM, I'm on to some thing good maybe(thats a change!)
from the graph it seems better to have the shorter stroke
since I'm gonna be revin' harder and making more power
longer which is exactly what I want, and 25 ftlb low torque loss
won't hurt nothing,since the 330 crank is helping me generate
more torque where I would actually use it. Where does one buy
this software?

Thanks a big one! Ratsmoker

Fe power

 

The graph I posted has both 360 and 390 curves. YOu are basically building a 360 with a steel crank right????? I put the curves together so you could compare them.

 

You can buy it from most auto parts or performance stores. Summit Racing and jegs sell it. Also pretty much any software store will have it.

 

ya thats about what I'm gonna do, when I get
access to a good shop,cause my basement is a
pretty low clearence area.the 330 crank
is the same thing as a 361 crank,correct? would a
360 crank hold up to this?It would be easier for me to use one of those since I find 360's lying all over the ground at
my buddy's place,the 330 crank is still in the bus

I'm not all that keen on steel cranks unless it's gonna
help my motor stay together better than a cast crank.

 

>it's not gonna be a truck motor so I don't care
>for low end, my buddys car can barely pull itself
>onto a hoist....but it'll pull past 5 cars with the speedo
>buried at 120mph, I want the engine to start pulling hard
>at 2800 or so then max out at 5000-5500 cause I'm gonna
>build a good capable passing car.
>
>Fe power

You're still better off with the 390. While the 3.50" crank should give better peak horsepower, it doesn't do so until 6000 rpm. If, as you said, you want the engine to perform in the 2800-5500 rpm range, then the 390 is the better choice.

Even if you expect to spin up to 6000 rpm on occasion, the 390 is still the better choice. The shorter stroke engine doesn't have any significant power advantage until 6500 rpm, which is really pushing it with the FE valvetrain. You'd need some expensive parts up top to handle 6500 rpm continuously. And you'd need to spend a LOT of time up there to overcome the engine's disadvantage from idle to 5500.

If you still decide to build your engine with the shorter stroke, you should be fine with a cast crank out of a 352 or 360. It will be lighter which means it should allow the engine to rev quicker, and the crank is plenty stout for any naturally aspirated application. The reason Ford put steel cranks in the FT series is not because the FE crank wasn't strong enough to move a big truck - it's because the FT engines needed to accomodate front PTOs.

 

Kinda reluctant to build another 390 cause I allready got
3 of'em,need some thing new, it would be a 371 fe!
now there's a piece of work to talk about.



Fe power

 

I was thinking of going .080 over to get a 4.13 bore
but that's a waste of a block. What could I do
to get a tad more torque?


Fe power

 

desktop dyno is probaly just a rough idea of engine
performance, yet interesting. I'll have to find out
for my self once I build this thing.


Fe power