1972 Chevy 4wd Longhorn Project: Never Ending Changes

[watahyahknow]

im kindah wondering if boxing the frame will cause it to crack near the crossbraces where you need to work the plating and welding around ,
wat might work is to get a second frame take both the original and the extra apart so you only have the framerails make one of those thinner cut them towart the bended part so they shut straight ontoo the other original rail and swap left to right and vice versa , cut and shut the crossmembers so they fit ontoo the inside out and thinned framerail and you still can use the original bodymounts on the outside part on the original framerails and can still fit the front suspention parts after you remount those , put the original framerails on the outside and weld them together to get a boxsection out of one piece , only the part near the front suspension needs sumting made as it bends in more than one direction

its hard to explane but basicly you make the boxplates out of one piece using the extra frame and change the crossbraces to fit and be mounted to the inside plates so they dont go through the plates to the other frame and keep the original frame as is exept for the crossbraces everything mounted on the outside of those rails need to stay at the original location and at the original width

[Dieselwrencher]

I highly doubt the frame will crack. It's already a pretty heavy duty frame. Plus I'll be redoing some cross members and the GN hitch will be sitting on 2"x4" 1/4" tube. I'm sure it'll be rigid as all get out. This isn't a trail truck, so I won't be trying to twist it up either.

[Dieselwrencher]

It's amazing that I've lost the little bracket that holds up the steering column against the brake pedal bracket twice during this build. Man, it'll be nice when this thing has all it's parts bolted on it.

[Dieselwrencher]

Yes I have. They are still trying to get the braking power side of it to work better. They sound cool, but I guess don't brake well yet.

[mknittle]

Originally Posted by Dieselwrencher

Yes I have. They are still trying to get the braking power side of it to work better. They sound cool, but I guess don't brake well yet.

Could be not enough manifold pressure. that was one of the problems the cat 3406 had. Swapping a holset turbo helped.

[watahyahknow]

i think a retarder / magnetbrake would work better ,

i have seen motorbrake stuff but i think it works by smothering the intake air while cutting the injectors the vacuum makes the engine resist reving when running downhill in gear , prolly whont work with turbo's as they get hurt when you cut the air intoo them ... sucks the oil right trough the seals

[mknittle]

Originally Posted by watahyahknow

i think a retarder / magnetbrake would work better ,

i have seen motorbrake stuff but i think it works by smothering the intake air while cutting the injectors the vacuum makes the engine resist reving when running downhill in gear , prolly whont work with turbo's as they get hurt when you cut the air intoo them ... sucks the oil right trough the seals

thosr things are too heavy. all class 8 truck engines can be fitted hith engine brakes and do not work on vacuum thy work on compression and the more manifold pressure the better the braking.We are getting around 30 PSI on a Cummins big cam 2 on the jake.

[Dieselwrencher]

I bet a magnet brake isn't cheap either.

[Dieselwrencher]

More porting pics. Man, this is a lot of work and hard on a guy's back.











It's hard to capture some of the angles and such with the lighting.

[watahyahknow]

Originally Posted by Dieselwrencher

I bet a magnet brake isn't cheap either.

definetely not , i was looking intoo using a set of those for a dynomometer-rerthingamajig and there way up there pricewize , they dont wear out though as here no parts touching it kindah works like a dynamo creating its own power to create the magnetic field
the cast iron disk usually isnt coated verry whell and there sitting behind the transmission in the open air so they look like a big ball of rust when you do find them at a truck wreckingyard

there was a show on discovery some time back that incolved a landspeed record attempt using some jetfighter turned intoo a car , they used a thick aluminium disk that turned with the wheels and another one that was stationairy next to it on the axle with permanent magnets in them
to brake they put the plates with the magnets closer to the rotating disk and the magnetic field caused the disk to resist rotating , it worked harder if the wheels where spining fast and redused in drag when the wheels started spinning slower , it allso didnt create heat

http://www.youtube.com/watch?v=Bkbdm66UQis

[Dieselwrencher]

Oh yeah, a couple of days ago I put on the LH door handle. That's progress. Right?

My ORD zero rates came today and I plan on putting them in this weekend.

[jbclassix]

Originally Posted by Dieselwrencher

Oh yeah, a couple of days ago I put on the LH door handle. That's progress. Right?

My ORD zero rates came today and I plan on putting them in this weekend.

Ok, I am guessing that zero rates relocate your axle off the center pin with no degree change correct? I am not getting the 2-hole, 3-hole thing. I have never used them before. Educate me.

[1985-GMC]

Nice job on the head porting, you can really tell the difference on those exhaust ports!

Now show us your weapon of choice for all that!

[ryanroo]

They are called zero rate add-a-leaf. they can recenter the axle or not. they are called add a leaves because they become a part of the springpack when you bolt them on with the center pin but do nothing to change the springrate like a normal add-a-leaf. the 2 hole three hole is the choices for moving the axle forward or back
Ryan

[jbclassix]

Originally Posted by ryanroo

They are called zero rate add-a-leaf. they can recenter the axle or not. they are called add a leaves because they become a part of the springpack when you bolt them on with the center pin but do nothing to change the springrate like a normal add-a-leaf. the 2 hole three hole is the choices for moving the axle forward or back
Ryan

Ok. Hence the countersunk holes. His just have multiple positions, right?
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[Dieselwrencher]

Originally Posted by jbclassix

Ok. Hence the countersunk holes. His just have multiple positions, right?
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It allows you to move the axle 1" or 1.5". That's why there are 3 holes. You'll end up using 2 holes when you're done. I'm not too keen on the grade 5 bolts they want to use as the new center pin.

[jbclassix]

Don't cheap out and use the low grade hardware. Check out this problem we ran into at work. Link-a-ma-jig

[Mattman2010]

Originally Posted by Dieselwrencher

It allows you to move the axle 1" or 1.5". That's why there are 3 holes. You'll end up using 2 holes when you're done. I'm not too keen on the grade 5 bolts they want to use as the new center pin.

Use grade 2, it will make things far more interesting when you put the foot to the floor!

[mknittle]

Ryan, This is off topic but thought you might like to see this. it is still in the mock up stage on the grill shell. the engine needs to be moved back. and and and....

[watahyahknow]

Originally Posted by mknittle

Ryan, This is off topic but thought you might like to see this. it is still in the mock up stage on the grill shell. the engine needs to be moved back. and and and....

would be kindah neat to make it intoo a panelwagon
http://www.ewillys.com/wp-content/up...bridges-mt.jpg
cut the rear of the cab of behind the door and move it to the rear than fill up the space between with sheetmetal mount the lights straight on the rearsteel and channel the whole lot over the frame so it sits a bit lower and you have to cut out fenderopenings in the rear

[Dieselwrencher]

And and and, sell it to me! Nice progress on the ol girl!

[mknittle]

Originally Posted by Dieselwrencher

And and and, sell it to me! Nice progress on the ol girl!

yeah, he is moving right along! the problem is the farther he gets the more my 52 gets buryed

[truckdude239]

man i just took 4 hours to read this thing and your not done with it!!

[1985-GMC]

I think its taken him more than 4 hours to get this far, so...
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[Dieselwrencher]

Originally Posted by truckdude239

man i just took 4 hours to read this thing and your not done with it!!

Well sorry man.

Originally Posted by 1985-GMC

I think its taken him more than 4 hours to get this far, so...
Posted via Mobile Device

Uh, yeah, you're totally right. It'd get done if I quit improving on it every time I work on it.