Engine and Transmission Tech

Nic, Thanks for the calculations. For the other Jim the engineer,what if you bored down between the head bolt bosses for the outer diameter of the sleeve that would make the block quite a bit stiffer. The flat bottom end with the maincaps flush with the panrails would be easy for 1/4" girdle. I think you could do a valley girdle also,picture three triangles bolted to the lifter valley bolts.Tons of info,search the current and archives on 4.9 in Pennocks Fiero Forum. That orange motor rebuild is on there. He had to use a 4.5 block as he found the junkyard motor was cracked in a front end collision.Northstar piston is .040 larger with same pin height, about 1 point higher compression(10.5).Quad4 piston (same bore, 3.62)is dished slightly for 1 point compression drop.(8.5)



Edited 4 time(s). Last edit at 12/31/2009 07:34PM by mgb260.

4.5 is 3.62X3.31=273 cubic inches. So Nic, help me out here. 3.8X3.31=? 4X3.31=? Same piston as 4.9,longer rod(5.9 vs 5.7 for the 4.9). Jim, what's a radius squared?

Damn near 300 even CID for 3.8" bore. That's nice.
333 ci (5.45l) for the 4" bore. Cool number.

Here's the long version:

8 pies stroked x square radius =

1) Bore dia divided by 2 equals radius.
2) Radius times itself times 3.14 (π) gives area of piston. (Pies are square)
3) Area times stroke gives cylinder displacement.
4) Displacement times number of cylinders gives engine displacement.

So for a V8,

8 pies stroked x square radius = displacement.

Happy New Year!

Jim



Edited 1 time(s). Last edit at 01/01/2010 03:03PM by BlownMGB-V8.

Folks, Carl Floyd "threaded" on 12/27, under "power cal'cs, a link to many of the formulas we need for such work. Thanks Carl, roverman.


Engine Calculators

[uempistons.com]



Edited 1 time(s). Last edit at 10/18/2023 10:00AM by MGBV8.

Happy New Year to you guys, This bench machining is a blast! You know like bench racing.Yeah, Carl thanks for the link.Cool!

Pies are round; cornbread are square

xcept for mathmaticians. They got square pies and round cornbread. Come to think of it. I always liked round cornbread better anyways. (baked in an iron skillet)

Jim

Call me old-fashined-jus doan call me, I like fish-net like material-line up the back... an an for just me, "Injection is nice, but I'd rather be bl.......", never mind. Is this our first "bench jacking" of 2010? -cool. roverman.

"I like....
I like the little way the line runs up the back of the stockings
I've always liked those kind of high heels, too, ya know I...
No, no, no, no don't take 'em off. Don't take...leave 'em on
Yeah, that's it...a little more to the right"

-Everybody Wants Some!!- Van Halen (David Lee Roth era)

Good one.

Isn't this graaaaate ! Our "commune", at the Cadillac Ranch, has woven the first hemp rope in 2010 from "Caddy" threads. roverman -not up-in-smoke

I don't know where to start here anymore.No wonder Nic crosses over to all these different threads. I think Roverman was inferring Jims fishnet idea for block filler.Carl's just got a good sense of humor! What really surprised me is Dan Masters started it! Hey I got it,you guys are very helpful and you can still goof around, but seriously after you get the 4"(or 3.8) liners in the Caddy you can pour in block filler easily because you can see down around the wet liners. There is a procedure to set the liners first. You have to torque the heads with an old gasket to 30 ft lbs first to insure they are seated on the O ring. The block filler would be insurance to prevent leaks. See how I intertwined the humor with getting back on track. I have a line on a 94 4.9 core I am going to try to get next week,plus a RWD 4.1 TBI intake and valve covers. The early intakes were single plane the later(89 and up) dual plane. My idea to make a 4 barrel manifold. First the 1/2"TBI adapter with counterunk scews,porting, then the Edelbrock split 1" spacer.Hey does that Extrudehone company still exist?More pictures:





Edited 2 time(s). Last edit at 10/17/2010 02:14AM by mgb260.

If I did fuel injection I'd be tempted to do what this guy did on a Northstar : use 650-750 Suzuki motorcycle throttle bodies on tube type manifolds because it looks so cool! I would use chrome stacks on top though.






Edited 1 time(s). Last edit at 01/03/2010 05:53PM by mgb260.

Jim, you entertwined somptin-"pfunny"?Pic's are TB's with port injection? If you "must have' I.R. ,for Caddy Shack, you mite "peep", type I or IV, VW(using IDF. Webbers) or John Eales,"swan Necks' for Rovers? roverman.

The individual runner manifold won't work, because as Nic noticed, you are limited with the intake being part of the head under the valve cover. You could do the Inglese 4 barrel to Weber deal though. This is shown on a V6 manifold.





Edited 2 time(s). Last edit at 01/05/2010 02:58AM by mgb260.

The runner/pushrod geometry kinda sucks doesn't it. A custom intake might be quite a chore.

Jim

Other than the forged crank, What does the push rod motor have to offer, vs. Northstar?

Inexpensive base,(thousands in wrecking yards for around $300 avg) easy 300HP,possibly larger bore. It looks like it is limited to the "poor boy" Performer 4 barrel intake mod.You could turbo or supercharge for more power.

Maybe you could chop off the two sides and graft in a different intake?