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Old 01-25-2011, 08:06 PM
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frame idea critique on a 1942 Pontiac

im in the beginning stages of designing a frame for my 1942 pontiac.

the reason i am building a new frame, is because i want to.
ive built 4 complete chassis so far, so the more i build the better i get.
street/strip car ( yea i know its heavy. but so is my foot)

im thinking of building the parameter of the frame with
2 x 4 x 1/8" rectangle tubing.
2x2 x-member with driveshaft loops.
2x3 x 1/8th inch for crossmember in the rear to mount a truck arm 2 link. w/ a panhard and coilovers.
Z'ing the frame 4" in the front, because i want to run a 4" drop solid front axle.
front axle is going to be on a set of ladder bars/hairpins. and either a traverse leaf or semi-elipticals.
chopped top inbetween 3-4 inches.
the drivetrain i have for it is a 466 pontiac and a 4 speed m-21.
most probally going to use a 9" rear not sure on gear selection yet.

good or bad, what are your guys opinion?
the said car is on the left of this pic.

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Old 01-27-2011, 01:41 PM
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Why run a solid front when you already have IFS?

Cool project!
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Old 01-28-2011, 04:13 AM
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weight would be my guess BUT if it were me, a MII type crossmember alston, heidt's etc ( not fatmans, too heavy) but if you're really wanting a straight axle, i'd go semi eliptical rather than transverse (less linkage to fool with)

sounds like an interesting project!
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Old 01-29-2011, 10:12 AM
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Quote:
Originally Posted by CALI4N1A
Why run a solid front when you already have IFS?

Cool project!
the reason i want to run a solid front axle is mostly because i want to be different. weight is one factor, but being different is the main factor. ive been looking around at projects of the same nature and everyone is running IFS.

i will not run any fabricated type of IFS, it actually has a early camaro clip in it right now but the ********* installed it 2" further foward that its supposed to be.

i plan on having this car on the track more than the street. and all the really fast cars run a straight axles.

i was originally going to do a gasser style project with this, however this car is too damn beautiful to be in the nose bleeds. so "LOW AND ALLLLL GO!" is going to be the moto.

im not a stickler for how nice a car rides, i like em bare bones rugged and straight to the point!

semi eliptical hua?? this type of spring action is actually more work than a traverse leaf. you still gotta have a set of shackles, but on the eliptical, you have to mount 2 springs, instead of a spring perch. both ways will have to have a panhard installed, im guessing

keep the ideas rollin! appreciate it !
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Old 01-29-2011, 10:54 AM
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Quote:
Originally Posted by h0trod389
the reason i want to run a solid front axle is mostly because i want to be different. weight is one factor, but being different is the main factor. ive been looking around at projects of the same nature and everyone is running IFS.

i will not run any fabricated type of IFS, it actually has a early camaro clip in it right now but the ********* installed it 2" further foward that its supposed to be.

i plan on having this car on the track more than the street. and all the really fast cars run a straight axles.


not true (unless you count fuel cars)


i was originally going to do a gasser style project with this, however this car is too damn beautiful to be in the nose bleeds. so "LOW AND ALLLLL GO!" is going to be the moto.

im not a stickler for how nice a car rides, i like em bare bones rugged and straight to the point!

semi eliptical hua?? this type of spring action is actually more work than a traverse leaf. you still gotta have a set of shackles, but on the eliptical, you have to mount 2 springs, instead of a spring perch. both ways will have to have a panhard installed, im guessing

keep the ideas rollin! appreciate it !

transverse sping'll take more work and will possibly get in the way of pulling the pan (depending on where the engine is set back)
your car, do what you want..sounds like you've got it all figured out anyway
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Old 01-29-2011, 11:17 AM
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ive got the jist of it, but i dont have it all worked out yet!

when i was talking about the ease of installation i was thinking im building a suicided hotrod..lol cant do that with this car.

wasnt thinking about the wheel placement of the front,
this is why i posted this thread! so i can have it all worked out by the time i get to fabication!

sounds to me that a dual leaf spring is the way to go....
for the simplicity of matinence!

ive seen semi elipticals but something in my brain tells me to not touch it.
mabe the fact that they are not semetrical, who knows.

and coil overs would look like garbage!
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Old 01-30-2011, 01:38 PM
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semi-elipticals=dual leave springs...
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Old 01-30-2011, 09:37 PM
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ok now im confused....ive always thought that semi elipticals were 1/2 a leaf spring, one end ridged mounted and the other end on a shackle.
but after you posted this i started lookin things up and they call dual full length leaf springs semi eliptical also....
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Old 01-31-2011, 03:48 AM
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Quote:
Originally Posted by h0trod389
ok now im confused....ive always thought that semi elipticals were 1/2 a leaf spring, one end ridged mounted and the other end on a shackle.
but after you posted this i started lookin things up and they call dual full length leaf springs semi eliptical also....

yeah, those would be 1/4 eliptical's..
btw, it you DO go semi-eliptical, make sure the shackles are at the front (take a look under a CJ jeep)
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Old 01-31-2011, 12:41 PM
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whats the differences on the locations of the shackles rear vs. front?
i have been wondering this question for some time.

ive asked alot of people this very question, without solid feedback.
i was building a 46 plymouth gasser with a straight axle a few years ago.
ive looked at alot of cars, but wasnt able to come to a conclusion.

what i have noticed is that on 4wd rigs the shackle is in the rear, and a 2wd straight axle has them in the front.

seems to me that if the shackle was in the front it would give the axle more leway to move during cornering and braking..
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Old 01-31-2011, 06:07 PM
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i can't think of any oem vehicles that the shackle is on the rear 2 or 4 wd (but i could be wrong)
no real proof but i'm thinking it's more for steering issues than anything.
i suppose if it's a cross steer setup, it's not a big deal...
anybody got an answer?
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Old 01-31-2011, 06:49 PM
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my 71 international, and my buddys 73 dodge truck both have shackles in the rear of the front end.... im going to start aother thread for this!
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