6.7 verses 5.9

[CUMMINZ]

With all the hipe about new 6. 7 coming out with more HP/TQ, I suppose the real issue is how both stock engines deliver the HP/TQ to the rear wheels. The 6. 7 with more gizmos on the engine and exhaust, and I am sure that will decrease the the actual HP/TQ at rear wheels.



Any ideas?

 

[jwilliams3]

No, there should be any extra drivetrain loss.

If you buy a 305hp engine (ie Cab Chassis) then you are still getting the rated 305hp at the flywheel.

 

[Cummins360]

OK I got a question for all of you out there, With all the pawer that can be made from 5. 9 liters of displacement, dont you guys think that if you were to take all the emissions crap off of the 6. 7 AND put some kind of a re-programmed ECM on the engine (to get rid of the emissions programming) that you would have an engine capable of lets say 1000hp and like 1500foot pounds of torque???? I may be off with those numbers but I'm just saying I think there will be some pretty damn powerful trucks out there as soon as someone comes up with a way to re-program an ECM for the new engine.

 

[16919]

Lets hope so or we'll all be driving the trucks we have now; until they come out with spaceships. :-laf not that its a bad thing

 

[FDavid]

First off, I am sure Marco will have something in the works to make the trucks run right without the emission garbage. Second, most of the big pullers are running bored or stroked 5. 9s that are over 6. 7

 

[NIsaacs]

My guess is the two trucks will be very close in power output at the rear wheels. The Cab & Chassis (or "truck" specs will be sae net) or including all belt and gear driven accessories, while the ("pickup truck") will be sae gross power, or with none of the accessories being powered, at the flywheel.





"NICK"

 

[JasonCzerak]

I would think given time that they 6. 7's will be modify-able just like the 5. 9's.



The only concern would be at this point how well the block deals with heat since there are no cooling jackets between the cylinders.

 

[COWBOYDUALLY]

The only concern would be at this point how well the block deals with heat since there are no cooling jackets between the cylinders.



??????????? Seriously, there aint no damn cooling jackets in there?????

 

[Cummins360]

???????????????????Why arent there any cooling jackets there??????????????????

 

[jwilliams3]

The only concern would be at this point how well the block deals with heat since there are no cooling jackets between the cylinders.

Before everyone cries foul..... That is not the whole story.



The block does have cooling between the cylinders and all around them. The only place the casting touches is between each cylinder and it is only a very small area. The post above makes it sound like all the cylinders are running in a blocked off area with no coolant around them.



The 6. 7 has extensive changes to insure that the engine and all of its compenents are cooled properly.



To analogize the cylinder cooling just picture in your head you sitting a coke can next to another coke can so they are touching each other. (or pepsi if you dont drink coke :-laf ). This had to be done to maintain cylinder wall integrity with the increased bore size of each cylinder and maintain the same block length as the 5. 9.

 

[JasonCzerak]

... .



To analogize the cylinder cooling just picture in your head you sitting a coke can next to another coke can so they are touching each other. (or pepsi if you dont drink coke :-laf ). This had to be done to maintain cylinder wall integrity with the increased bore size of each cylinder and maintain the same block length as the 5. 9.

#ad






coke can sure but yeah, not the entire cylinder, about an "inch" or so is shared metal.



I'm sure things will be fine.

 

[EricBu12]

That's interresting to hear but glad they did something to help strength...



I rebuilt my '01 and it is bored . 20 over. . what size litre would that be?... 6. 2?... . higher?

 

[KCJackson]

I rebuilt my '01 and it is bored . 20 over. . what size litre would that be?... 6. 2?... . higher?

You have created a 396, which translates to 6. 5L.

 

[JasonCzerak]

You have created a 396, which translates to 6. 5L.

and . 30 over is a 6. 8 liter..... hmmmmm and that's just with bore.



what kinda a stroker cranks can be put in these blocks?

 

[Scrappy]

and . 30 over is a 6. 8 liter..... hmmmmm and that's just with bore.



what kinda a stroker cranks can be put in these blocks?

European 6. 7 crank maybe?

 

[NIsaacs]

I may be all wet, (I have been several times), however, isn't a twenty thousands over bore on a six cylinder only about 3 cubic inch larger?





"NICK"

 

[Lightman]

That's interresting to hear but glad they did something to help strength...



I rebuilt my '01 and it is bored . 20 over. . what size litre would that be?... 6. 2?... . higher?

Don't you mean . 020 over bore I don't think there is . 20 that can be removed from the cylinder thats just short of a 1/4"

 

[KCJackson]

I may be all wet, (I have been several times), however, isn't a twenty thousands over bore on a six cylinder only about 3 cubic inch larger?

He said . 20" (two tenths), not . 020" (two hundredths or twenty thousandths), so I took him at his word.

 

[JBlock]

touching cylinders

#ad






coke can sure but yeah, not the entire cylinder, about an "inch" or so is shared metal.



I'm sure things will be fine.

Did Chey 400 small block use simese cylinders, how they hold up??

 

[JasonCzerak]

Don't you mean . 020 over bore I don't think there is . 20 that can be removed from the cylinder thats just short of a 1/4"

HA! yeah. that's right . 020... wonder why I took it at face value as well... .