high horsepower & extremely high torque transmissons?

[Ibexe666]

Already said to much not releasing any more on the engine need to focus on the transmission when entire project is finished ill release everything down to the bolts used if asked

 

[Jbulach]

Fully understand. Good luck!


M925A2 with dump hoist

 

[Ibexe666]

Nice to see people who understand went on a 4x4 page looking for help and just got called crazy and flammed

 

[Jbulach]

Yeah given the numbers and weight, A Allison HD is the only way to go.

You do have my curiosity though, is this a completely ground up prototype, or are you basing it off a production engine?

Anyone know if these transmissions are up to the task of those RPMs?

 

[Ibexe666]

I checked data sheets for one thwy supplied it maxed out at 2100rpm

 

[Jbulach]

Well there goes your warranty


M925A2 with dump hoist

 

[Ibexe666]

what warranty

 

[Jbulach]

I know it's apples to oranges on weight, but what kind of numbers are those guys pushing in the new 7000lb pickups that are smoking all the fast street cars on the strip


M925A2 with dump hoist

 

[grendel]

I'd check with Allison about a custom pump.

 

[Ibexe666]

Pump would help keep high clutch pressure correct?

 

[grendel]

Pump would help keep high clutch pressure correct?

Yep. They can build one that will handle that in the weight range you plan on.

 

[patracy]

I know it's apples to oranges on weight, but what kind of numbers are those guys pushing in the new 7000lb pickups that are smoking all the fast street cars on the strip


M925A2 with dump hoist

Not really a good comparison. You're talking a huge weight difference. HP numbers, sure 1K is doable from modern pickup truck diesels. Heck I had 500rwhp in my dodge that was a daily driver. But the torque will be a bit different in it's bands between the two. Also consider that weight works backwards as well. It's easier from a "leverage" perspective to move 10K lbs than it is to move 20K lbs. The lever being the transmission.

 

[Jbulach]

I was thinking in terms of scale, (torque vs weight) those pickups are already putting more demand on their transmissions.
Maybe their trany builders would be a good place to look for build tips on a big Alison


M925A2 with dump hoist

 

[BenRoberts]

I know some of the guys at Firepunk diesel in plain city ohio. They build custom trannys for high hp trucks. I have one in my pickup. They have won the diesel power challenge 2 years in a row now.

 

[HETvet]

I'm not going to throw the BS flag, but from what I have see, it's hard to believe. With out knowing what kind of bolt pattern the block has, we can't really give you a direction to go with transmissions. In the light duty world, you can build any of the transmissions to handle the power, be it for a short period of time. In the medium/heavy duty range, a twin or triple countershaft transmission is the way to go. They will take the power and weight with out much fuss. But it's a non synchronized transmission with a trans brake. You could float the gears like they do in big rigs, but that just makes rebuilds more frequent. The trans brake is friction material on the trans housing and the throw out bearing is a pull type; if you push the clutch to the floor, you engage the brake slowing the rotation of the transmission for first or reverse engaugment from a dead stop. Activate this at any other time while the vehicle is moving and you will **** *** **! Not to mention these transmissions are super expensive. To make 1Khp reliably, again is not cheep or budget friendly. Just don't seem logical to drop that kind of coin when there are proven, more caust effecency ways to do what you want to do. There is a reason mark Cuban hasn't designed and built his own Ferrari, the Italian one works and is Cheeper. Just sayin

 

[dk8019]

This could be done. One could take a Detroit 8V92 or the even bigger 12 cylinders could easily make 1000HP and hit those torque numbers. Fitting it into a 5-ton I'm not sure, but crazier things have been done. It's spendy no doubt!

 

[HETvet]

Cummins ISX15, DD15, CAT C18 all will make that power easily. But hard to fit. A DT466 will do it as well and fit. The problem is the transmissions ability to take that much torque at such a low RPM while moving that size of a vehicle under the abusive conditions the OP is planning on putting it through. Every aspect of this is spendy. Would love to see it done, but the combination of requirements seems to be a pipe dream from my point of view

 

[ScubaCat]

Until you find out how much it costs.

Ain't that the truth...Speed costs money how fast can you afford to go? I was on the phone with an Allison rep yesterday and the tannies your looking for are in $20k area, PLUS exta parts and fab needed PLUS set up and dialing in...

 

[Ibexe666]

Limit for this build is 150k

 

[99nouns]

cost is no issue lol and whatever transmission will take the cake it will take a **** of a beating

Until you find out how much it costs.

Cool so this is where all the rich guys hangout, I might not belong here but simple hi wouldnt hurt...