Alright fellas. Desktop Yno this for me please, but first I have a question. My crank has a 2UA cast into it. According to the Clevite book, it a crank special for trucks. Does anybody know whats makes it a truck crank or whats special about it. Heres the build.

390 bored .60
flat top pistons (from the 360 master kit from EPWI for more compression)
CRN-343902 Crane Powermax cam lifters and valve springs
hv oil pump
double roller timing
ported & polished D2 heads
dynomax blackjack headers
S code 4brl intake
Edelbrock 650 cfm performer carb
open element air cleaner

Thanks fellas

 

It all depends on flow through the cylinder heads. It should be anywhere between 345 and 388hp, and 447 and 458ft-lbs, depending on how you did porting the heads.

Also I think you may have too much compression for that cam; you'll probably have problems with pinging.

 

Hey rusty, what does IMEP, FMEP, and BMEP mean, or stand for in that program?

 

IMEP: Indicated mean effective pressure
FMEP: Friction Mean Effective Pressure
BMEP: Brake Mean Effective Pressure

 

Ok Now we need the brake down of what each one means and what effect it has on the motor?? and what would be the optimum numbers to run?

RJ

 

cool, and yea, what Russ said!

 

Hell, if I knew that I'd be making money doing this stuff!

http://en.wikipedia.org/wiki/Mean_effective_pressure
http://www.epi-eng.com/ET-BMEP.htm

As far as I know, the other one, FMEP, indicates how much of your potential horsepower is lost to friction.

 

Thats OK Kurt..I dont know them all either..LOL.. yeah your friction HP loss, and then one is for pressure under the intake (the Heads see as restriction) Like trying to suck air thru a 10" hole as sucking thru a 1/4" hole...

And I dont have the book for my EA3...Or I could READ it, like most people do...LOL..So I have had to use it buy the seat of my pants, and call on others that have it for Shop use to find out what I need pertaining to my build..LOL..

I was just pulling your leg..as not many guys that have been in it for years know!! But your a pretty sharp kid..And there was allways the chance that you researched it and knew? Thats why I asked..."not that I knew" and even If I did know..doesnt meen I would understand it?? LOL

I'am just happy I'l be getting my air from outside the engine bay!! and not trying to induce a couple hundred degree air into the induction system!

RJ

 

Now there is some good thinking! Got any ideas on that?

 

Well, what were the compression readings.

 

Well kurt, as a matter of fact I do.....there's a couple i've been working on for about 2 years now....and I'am still in the process of taking them from a final draft to put them on CAD..

The first proto type I made was out of sheet metal for a single 4 induction Ram air....and I designed one for a 2 x 4 set-up for glenns 454" sideoiler..and added a couple things to the inside of the airbox to help in atomization...

But when the shop is done? hopefully by the end of summer...I have a Sheet metal brake and a few other tools to start making some up out of stainless sheet.. and I'll buy one of my uncles mig welders..and practice up on my welding...I dont weld that offen..and it takes me about an hour of practice to run a bead that I like..and I think someone would be happy with.. So once I get everything roller...they'll be made on a custom basis.. For different throat size carbs..shallow and tall side..depending on hood clearance..a few more options..

So if I'am lucky ? I 'll have a couple built proto types done by next summer...I'am not loking to make major quantities..Just some for some of the guys I know...and a few for whoever likes em... we'll see what happens...LOL

RJ

 

With that combination, somewhere around 9.75:1. Of course, I'm making some assumptions there. I'm assuming about 71cc combustion chambers, .014" deck clearance, 10cc of valve reliefs, and a .041" thick Fel-Pro head gasket. Your measurements will probably differ from that somewhat. Oh, and the 2UA 390 crank. That is functionally identical to a standard 390 crank. As far as I can tell, the only difference is the casting number. Good strong unit.

Russ, that sounds good! Did you ever hear about these guys:
http://www.ramairbox.com/

 

Hey fellas, my block gets out of the machine shop tomorrow and I am fixing to order my cam. Like I said the CRN-343902 but I was woundering if the CRN-343941 would be better or is there another cam yall would recommend. Thanks

 

Like I said...

I think the 343941 would be a wise choice!

 

SHould be here tomorrow. Thanks a million rusty.
Ryan