Slant 6

[pflaming]

This statement was made on the web. How accurate is it?

 

"the slant 6 in- line engine tilted to around 30 degrees had a great balance of economy and power plus bucket loads of torque,. The “Super Six” equipped with its two-barrel Carter twin throat carb helped the slant six mopar engine come alive, It is reported that crusing down the highway fuel economy as high as 30 mpg could be achieved.

[Plymouthy Adams]

on a TDY trip once I had a rental car with the Super 6 in  it....cruising from Chicago to Indianapolis a couple times , it would garner at best 26.2..of course I  would have to add that a bit of congestion on the highway may have eaten into it's overall peak capability in economy..but for a fair report and such of actual conditions..would say that would be a good overall  evaluation of the performance and mileage.

[Tony724]

I had a 225 slant in my 71 Valiant. I think it had 145HP stock on barrel carter. Ran okay.

I think the hypers ran pretty nice. I know clifford performance has split headers, dual carb kits....etc for them.

Wished they had that stuff for my 52 Plymouth.....

Here's my buddies slant at the track. He loves those things!

 

 

 

 

 

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Edited April 2, 2015 by Tony724

[P15-D24]

Had the 225 in a '68 Dodge Dart. Choke was crap, always stumbled when cold. Finally fixed that problem with a manual choke. Gas mileage was crap also, never saw over 20 mpg even at 55 MPH cruise. Once it was warmed up it did pull good and had decent performance. "Economy" of these engines are way overrated.    

[Tony724]

Had the 225 in a '68 Dodge Dart. Choke was crap, always stumbled when cold. Finally fixed that problem with a manual choke. Gas mileage was crap also, never saw over 20 mpg even at 55 MPH cruise. Once it was warmed up it did pull good and had decent performance. "Economy" of these engines are way overrated.    

 

I got no economy out of mine. I think my 225 slant was pretty bullet proof, and durable. I think I got about 15mpg, I am guessing. i am hoping my old 52 Plymouth 6 banger runs good for a while. This is my first 50's car, and a flathead. It made it 60,000 so far for others, hopefully a little more for me.

[Plymouthy Adams]

I regularly got 21 or better with my slant 6's execpt for the one in the truck...which is understood due to the final ratio....driving habits, state of tune and such along with terrain of operation plays greatly in anyone's economy/performance...they were always a very dependable engine...never walked home with a slant 6 under the hood...but...they have as most all things...gone well past their prime...

[pflaming]

I hope this thread will be oriented based upon experience not opinion nor personal preferance. One thing I've noticed as others have as well, is that dealers ordered their cars with a direct link to their road and usage conditions.  Hilly, curvy, non paved road areas oftern had a 4:11 while flat landers had 3:73 rear axles. Trucks were even more focused so that a truck could PULL a load to town and get back home. Dependability not time was quite possibly the game in town.

 

So now if I should buy or rent a nice used car I may get a 3;73 axle or I may get a 4:11 and not be any the wiser. If my friend drove a 3:73 and I a 4;11 I may well question his MPG claim. Now add a OD to that and things get even dicyer.  So the set up is the ticket, the combination of engine, tyranny, rear ratio and of course tires. 

 

That review accurate or inaccuate as it may be you may confirm like Reagan said "Trust but verify"

 

Now this question. Will a slant 6 bolt directly to a Pilot-House clutch housing if not what modifications would be required. The truck motor mounts are on the frame not resting on a cross member.  So that must be addressed to  put a slant 6 in a pilot house. 

[pflaming]

I am going to search out the most economical / 6 tyranny, differential, rear rim/ tire stock Mopar combination for my truck. Non-opinion combinations requested. I am not intereted in fluid drive nor overdrive, may have interest in 5 speed.

[Plymouthy Adams]

Gee PP I though you had that combo already...you made it to Clements and back and never used a gallon of gas...

[pflaming]

Yes, but that was in a ford focus which certainly worked well but not my preference.

[wayfarer]

OK, I'll bite.... First, most 5-spd are overdrive......

 

Next, there is no commonality between the /6 bell and the I6 bell bolt patterns. If you keep the /6 bell, and if you use a post-62 trans, then consider that the A-833 was used in OD form with the /6. If you need/want a truck style trans then that is easy since many trucks used the NP435 behind the /6.  If you keep the /6 bell then you are limited to other transmissions due to the long-ish input shaft on Mopar trans (over 8" on the 435...).

[oldodge41]

I have a 225 slant in my 69 Dodge Dart GT. Love that engine. Not sure if it gets much better than about 20mpg. It has a 904 Auto and I believe a 2.94 rear. A set of 3.23 gears would really liven it up and, for around here, may increase MPG a bit. I added a two barrel Super Six setup and it runs stronger for sure. Try Slantsix.org for all things slanted.

Edited April 8, 2015 by oldodge41

[Tony724]

I have a 225 slant in my 69 Dodge Dart GT. Love that engine. Not sure if it gets much better than about 20mpg. It has a 904 Auto and I believe a 2.94 rear. A set of 3.23 gears would really liven it up and, for around here, may increase MPG a bit. I added a two barrel Super Six setup and it runs stronger for sure. Try Slantsix.org for all things slanted.

 

I use to always be on slantsix.org That site is awesome! They helped me a lot with my valiant. I miss that car damnit!

[Ulu]

 

 . . . crusing down the highway fuel economy as high as 30 mpg could be achieved.

 

Depends on the vehicle.

 

My slant 6 only got about 16 in town, maybe 18 on the freeway, but it was pulling this:

 

 

This van had a 4-speed stick on the floor & the stick pointed forward from behind the front seats.

 

I sold it to the guy I bought my P-15 from & I've seen it running around the area from time to time.

Edited April 13, 2015 by Ulu