Springfield Flyer.

[robfrey]

What exactly is the current rear end?


Rob Freyvogel
#496
AA/BFS

[tauruck]

7.5" GM I'm told but I can get part nos in the AM Rob.
Thanks for caring. God Bless.

[kiwi belly tank]

There is no 2.44 in a 7.5-10 bolt Mike, the closest to that is a 2.41. I think I have some 2.29's here & the tallest of the 2 series is the 2.14 that actually calculates out to be 2.136.
  Sid.

[tauruck]

Thanks Sid. I'll check and get back.

[tauruck]

Rob, these are the nos stamped on the pinion.
560140-21-48-GM   81-7

On the casting on the crown wheel it is 558912 GM50.

[tauruck]

More pics.

[tauruck]

Last one. Hope this helps?.
Thanks man. God Bless.

[robfrey]

Btw, I asked my buddy the small block ford engine builder specialist and he did not understand the valve angle issue that Ferrea was asking about unless he was referring to what angle the valves are in the head.


Rob Freyvogel
#496
AA/BFS

[Dynoroom]

I need help again guys.

Zeke from Ferrea wants to know if I want 15 or 24 degree valves.
I don't know enough to answer.
I'm using Ethanol and twin turbos.

Thanks in advance.

Mike, they are most likely referring to "Backside Valve Angle" or "Underhead Angle". I go with 15 degrees in this instance to help keep the valve lighter. This is also a good choice on intake valve for flow in general. On the exhaust go with the 24 degree as it helps with flow out of the chamber at the cost of a little weight.
Hope your project keeps moving forward.  

[desotoman]

I need help again guys.

Zeke from Ferrea wants to know if I want 15 or 24 degree valves.


Thanks in advance.

What Zeke might be asking you is what you want the back side of the valve to look like. In other words do you want a nail shaped (T) valve or more of a tulip shaped valve. Flow testing will dictate which is better, or someone who has run the same type combination.

All the best,

Tom G.

[kiwi belly tank]

Rob, these are the nos stamped on the pinion.
560140-21-48-GM   81-7

On the casting on the crown wheel it is 558912 GM50.

21-48 is the tooth count Mike, that makes it a 2.29 ratio. The carrier is an open 2 spider & probably a 26 spline. If you're going to run that, check the spider gear cross pin "locating bolt" to see if it's broken.
Don't run a collapsible pinion spacer, turn up a solid one that's about .020" wider than the old one & trim it down until you have bearing preload.
Keep the same shim pack when you change the bearing to retain pinion depth.
  Sid.

[robfrey]

I need help again guys.

Zeke from Ferrea wants to know if I want 15 or 24 degree valves.
I don't know enough to answer.
I'm using Ethanol and twin turbos.

Thanks in advance.

Mike, they are most likely referring to "Backside Valve Angle" or "Underhead Angle". I go with 15 degrees in this instance to help keep the valve lighter. This is also a good choice on intake valve for flow in general. On the exhaust go with the 24 degree as it helps with flow out of the chamber at the cost of a little weight.
Hope your project keeps moving forward.  

This makes much more sense.


Rob Freyvogel
#496
AA/BFS

[tauruck]

Rob, I was hoping you might have some advice on how I could get help on a CAD drawing for those gear ratios?. Thanks brother.

[robfrey]

Drawings gears is a bit of a different discipline that I do not have enough experience with.
Much information is needed but not too much as some of the dimensions are actually driven from others.
I would not know what dimensions should be “Reference” dimensions.
I’m struggling through this right now with just simple spur gears.
I would think that hypoid ring and pinion would be even much more difficult.
I’m sorry, I really wish I could help.


Rob Freyvogel
#496
AA/BFS

[tauruck]

No problem Rob. Thanks brother.👍👍👍