Driveshaft or HBAR?

**tunneljet** · 06-05-2008, 07:15 PM

I currently have a 13" end to end driveshaft in my Cheyenne. I am looking to gain more interior space and was wondering if I should switch to a 1350 hbar driveline? Also for those running this setup, what kind of height difference should I have between the pump shaft and crankshaft CL and angle? Min - Max? This is for a very very mild lakeboat BTW.

**widowmaker** · 06-05-2008, 10:00 PM

I'm running 1310 u joints with a 15" driveshaft in my deal. running low 9.0s. They are plenty strong for what you are doing.

**snewton** · 06-06-2008, 07:55 PM

i am running 1310's with a blown motor in a cp. no problems so far!

**Outlaw** · 06-06-2008, 08:38 PM

can anybody tell us at what HP or torque should we step up to a 1350?

**Brendellajet** · 06-06-2008, 09:13 PM

Pretty sure a 1310 is out of its league around 500 hp.

**RCB19** · 06-06-2008, 10:58 PM

Spicer 1310's will handle well into 1000hp

**slow67** · 06-06-2008, 11:05 PM

Originally Posted by RCB19

Spicer 1310's will handle well into 1000hp

No kidding, I see cars all the time with 300-500 hp, and they usually have somewhere in the neighborhood of a 2.5x or so first gear. If you have say 400 lb. ft of torque, x 2.5 x about 2 torque converter, you have a lot of torque goin thru a 1310 u-joint. Jets obviously have no torque multiplication.

**396_Ways_To_Spit** · 06-07-2008, 02:26 AM

I have NEVER tore up a set of 1310's in a boat. If you do, then something is seriously WRONG!!!!!

**396_Ways_To_Spit** · 06-07-2008, 02:27 AM

Set them up proper and keep em greased

They will love you for it

**Brendellajet** · 06-07-2008, 08:28 AM

There was a guy on HB running a 1310 I think with a thousand horsepower. His boat sank when his driveline let loose...1350 for me.

Scary to think some of you with all the coin you have wrapped up in your toys will go with the weakest alternative available for a jetboat driveline...

**widowmaker** · 06-07-2008, 08:37 AM

Originally Posted by Brendellajet

There was a guy on HB running a 1310 I think with a thousand horsepower. His boat sank when his driveline let loose...1350 for me.

Scary to think some of you with all the coin you have wrapped up in your toys will go with the weakest alternative available for a jetboat driveline...

...... it didn't break from HP I can assure you. lack of maintenance or bad welds.

**hotrod56cars** · 06-07-2008, 08:47 AM

I think tunneljet is wanting to ditch the long driveshaft in favor of a short H bar and move the engine back accordingly. I was wondering what would change if that was done also (driveshaft angle, driveability, handling, etc...).

**widowmaker** · 06-07-2008, 09:09 AM

Originally Posted by hotrod56cars

I think tunneljet is wanting to ditch the long driveshaft in favor of a short H bar and move the engine back accordingly. I was wondering what would change if that was done also (driveshaft angle, driveability, handling, etc...).

As long a the motor mounts, I'm assuming a rail kit is on the same plane( possibily 4 degrees) with the pump. You can move the motor back no problem with the use of a H bar style driveshaft.

**cs19** · 06-07-2008, 09:50 AM

I run 1350's now just to be safe but the weight of a long 1350 driveshaft really bums me out. I ran 1310's for a long time and was running about 1000 hp with a shot of nitrous on that and it held up fine. There are a bunch of guys out there doing that right now and they seem to hold up, never seen one that was well maintained break. I didnt want to take a chance so I upgraded. One driveline guy told me that 900 HP was the limit of a 1310. Its probably safe to say jetboats dont load the driveline as hard as a car does, those guys drop the clutch and hook up and go we can only dream of traction like that so we can probably push a 1310 harder than they can.

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Driveshaft or HBAR?

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