6.7 conversion questions

[loganp]

Instead of trying to put all the 2nd gen stuff on a 6.7, could you put the 6.7 crank in a 5.9 to get the extra stroke?

 

[cumminsman315]

Heres some pics

 

[cumminsman315]

Instead of trying to put all the 2nd gen stuff on a 6.7, could you put the 6.7 crank in a 5.9 to get the extra stroke?

Im not certain but i dont think you can do that

 

[roachie]

I did the math a long time ago. Installing a 6.7 crank in a 5.9 block is only going to give around 4ci increase or something like that. Not worth the cost of custom pistons

More interested on why the 6.7's are popping on the dyno. Its a siamese bored block so it should be stronger. But I guess sleeving it back down to a 4" bore would just make the block that much stronger.

 

[DISTURBED]

Heres some pics

Are those pics of the same engine? The pic of the head studs shows it has a tappet cover and the pic of it red doesnt show the tappet cover

 

[cumminsman315]

yes those are the exact same engines

 

[5150ram]

yes those are the exact same engines

You really have no clue do you?

 

[cumminsman315]

Those pics of the block are the 6.7 look at the pistons, they are 6.7 pistons with the bowl machined for 5.9 injectors, that painted motor is the same 6.7 with 5.9 head

 

[roachie]

Thats not a 6.7 block.

 

[5150ram]

You might be able to fool the cummins forum crowd but it wont fly here on comp-d.

 

[jupton]

I looked at those pics those are not the same engine. The bare one has a tappet cover and does not have a cp3 timing cover on it.

But anyway, has anyone thought about just boring the cylinders right out of a 5.9 block and putting custom "wet" type sleeves in to take a 6.7 piston? If this would weaken the block too much then just fill it?

I believe the pistons are all the same compression height and the difference is in the deck height of the 6.7 block correct? Seems to me 6.7 bore with 5.9 stroke would make an ideal high rpm pulling engine.

just throwing out some ideas...

 

[cumminsman315]

ok ok i looked over those pics and those are a p-pump motor. II sent us the wrong pics of the bare block

 

[VMacKenzie]

I did the math a long time ago. Installing a 6.7 crank in a 5.9 block is only going to give around 4ci increase or something like that. Not worth the cost of custom pistons

Yep doesn't give you a bunch more displacement, you go from 359.58ci to 371.87ci, a gain of 12.3 cubic inches.