shortening the 354 spring???

[rattlebox93]

what actually do i need to do to the "4200" or 354 spring im getting realy to asseemble the geartrain and pump ect and would like to shorten the spring

[ahale2772]

i cant see why ud want to shorten the 4200 spring, thems are some uncaharted waters if ur making power up there

[BobS]

I know it's just me and my opinion but I can't for the life of me see any increase in engine longevity when you start spinning it at more than twice the RPM where it was designed for peak torque. I think Cummins tested brand new engines years ago for collateral damage RPM's and IIRC it was 5250 RPM's when they go boom! I had that bookmarked before but seem to have misplaced it after a computer crash episode...

[oldestof11]

The 5250 rpms is a TDR myth.

Peak torque can be changed.

[BobS]

The 5250 rpms is a TDR myth.

Peak torque can be changed.

I thought I read it someplace else other than TDR because I don't vi$it that web$ite.

I know, I'd like to lower mine to 1500!

[ellis93]

What is all this talk of peak torque can be changed. With what?

[Richie O]

You do need to clip them so it will fit and work correctly. How much?? No idea. Me scared of those RPMs.

[oldestof11]

Ellis, things like timing, cam, turbo, compression, all effect where the peak torque is at.

Something as simple as changing the 18cm exhaust housing to a 12 will lower peak torque down a few hundred RPM's as the turbo lights quicker bringing the full boost to the engine sooner.

[PToombs]

And here I thought you were going to use an eraser and change the curve on the dyno chart.

[pulltilbroke]

IIRC I clipped 2 coils out of mine, Just set it next to your 366 or 386 spring and make it that length.

Why is everyone afraid of high rpms? You guys oughta try it its a whole lot of fun.



http://www.youtube.com/watch?v=XB4AvbOyzoU


A 6B won't grenade at 5K, There are a lot of 5.9s out ther turning a lot faster than that on a stock bottom end.

[rattlebox93]

sweet thanks man and just for the reckord from what i understand the 1st gen has the best rods and the biggest main bolts out of any of the b series motors that have ever been put in dodge truck correct me if im wrong but thats just what i have heard

[pulltilbroke]

I have heard the same thing many times.

I believe the N/IC shortblocks were the best and stoutest ever put in a dodge and had better pistons from a performance standpoint.

[92 D/UNIT]

I ran the 4200 spring. I did have to clip it to the right size. the truck ran better/different than it did with the 3200 spring. im not sure why, but it felt more responsive. and if anyone feels uncomfortable revving it that high, watch your tach..

[Begle1]

Somebody needs to get all scientific and stuff and graph these springs' tension verse their given length... See what kind of fueling curve the actually give per RPM, to see if a 3200 RPM spring does actually act harder on a governor than a 4000 RPM governor spring...

Just need a caliper and a newton gauge thingy...

For an all-out performance stand-point you want a stiff spring that stays stiff right up until the RPM you want it to cut-out, right?

Although doesn't Hook's law kinda mean the springs' curves will all be linear and that you just want as stiff a spring as possible that is long enough to still give you full fulcrum lever travel?

[BC847]

Somebody needs to get all scientific and stuff and graph these springs' tension verse their given length... See what kind of fueling curve the actually give per RPM, to see if a 3200 RPM spring does actually act harder on a governor than a 4000 RPM governor spring...

Just need a caliper and a newton gauge thingy...

For an all-out performance stand-point you want a stiff spring that stays stiff right up until the RPM you want it to cut-out, right?

Although doesn't Hook's law kinda mean the springs' curves will all be linear and that you just want as stiff a spring as possible that is long enough to still give you full fulcrum lever travel?

So, . . . . . . has anyone else dinked around with the fly-weights of the mechanical governor? Lightening them would raise the fueling roll-off point.