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Old 06-24-2005, 06:10 PM
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Driveshaft length

My question is just how short can a driveshaft be..when I laid out where I wanted my engine to set I wound up with about a 9 1/2" driveshaft..I do have some room to move the engine forward if I have to..the car is 106" wheelbase (same as a 32 Ford) if that helps..Engine is 351W with a C-6 trans..Rear end is a Ford 9"

Thanks guys

OMT

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Old 06-24-2005, 06:36 PM
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OMT,
I don't think the length matters, as long as its balanced.
The driveshaft in my Anglia is 14 inches.
Good luck
Bob
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Old 06-24-2005, 07:49 PM
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Thanks

Thanks Bob,
I will see if I can move the engine forward a skoosh and get closer to 14". The way it is now I am not sure I could install the driveshaft without lifting the motor..It is all good makes more room in the cockpit area..

Thanks

OMT
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Old 06-25-2005, 07:14 AM
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Quote:
Originally Posted by OneMoreTime
...when I laid out where I wanted my engine to set I wound up with about a 9 1/2" driveshaft...
OMT,

You must have your block set back pretty far. My rat project has a 351M, C6, 9" rear, and 106" wheelbase and my drive shaft is just a hair under 24".

About your question, are you going to leave the offset in you rear end or are you going to center the rear ( or move over the engine/trans)? I think the angle of the drive shaft starts becoming more important as they get shorter and shorter. So a 9" shaft with a (stock) 2" offset of the rear center section might be cause for some concern (at least in my estimation).

Dewey
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Old 06-25-2005, 10:59 AM
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Origiginal Plan

Dewey,
The original plan was to build according to circle track modified rules..The ones I have call for the engine to be no closer than 70" to the centerline of the rear axle as measured to the back of the block..Of course this C-6 has to to as long as a well rope and the pinion housing sticks forward some resulting in a drive shaft issue..and also I need a certain length of driveshaft to accomodate suspension travel..

The rear is centered in the car from end to end so the car is straight and square and that makes the pinion center offset about 2" as you say..that in and of itself I do not think is a major concern..That is if I can get enough driveshaft length to accomodate the angle..

Couple of options here..one is to move the engine froward and the other is to go shopping and see if I can find a bellhousing tranny combo that is significantly shorter than the C-6..actually it brings to mind that I may go shopping any way as I would prefer the manual..

This is a budget build but it is also a do it right build as well..Well at least the best I can do..

Thanks
OMT
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Old 06-27-2005, 04:02 PM
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I have a 351w stroked to a 408, C4 trans going to a Ford 9" (91"wheel base) in a Suzuki Samurai jeep, although I forgot the exact length, I remember it was under 10inches.
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Old 06-27-2005, 04:47 PM
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Quote:
Originally Posted by brainsboy
I have a 351w stroked to a 408, C4 trans going to a Ford 9" (91"wheel base) in a Suzuki Samurai jeep, although I forgot the exact length, I remember it was under 10inches.

Did you center your 9" or leave the off set?
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Old 06-28-2005, 02:25 PM
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Quote:
Originally Posted by cboy
Did you center your 9" or leave the off set?

Centered, so that the pinion is in the middle of the car.
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Old 06-28-2005, 03:03 PM
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In this case

The rear is using the stock housing so the pinion gear location is fixed with that offset..I went out looking at some manual trannys and they are a bit shorter than the C-6 and not all that basly priced..In addition they are not as bulky as the C-6 so I think I will go that route..probably will need to move the engine forward a bit but since I have almost a full 12" or so to do that that is not a real problem..upsets the weight distribution in the chassis but then there are just those things that have to be "worked around" so things fit and work OK..

All for now...

OMT
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Old 06-28-2005, 03:20 PM
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Keep in mind another good choice is the C-4. They are also shorter then its big brother C-6, and there are lots of parts available to beef them up. I believe even shorter is the FMX, I love these as you can rebuild them while they are still in the car.
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Old 06-28-2005, 04:03 PM
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Quote:
Originally Posted by brainsboy
Centered, so that the pinion is in the middle of the car.
Sounds like a wise move with that short of a shaft.
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