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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: dogdays]
#1334667
11/15/12 07:00 AM
11/15/12 07:00 AM
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Joined: Jan 2005
Posts: 4,862
the frozen wastes...
Pale_Roader
Swears too much
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Swears too much
Joined: Jan 2005
Posts: 4,862
the frozen wastes...
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Quote:
My only slant six experience was my grandpa's '64 Valiant. After he died we got to drive Grandma on long trips to see her other grandchildren. I don't remember getting over 23 mpg at 70. Long trips on the Interstate were murder. That constant commotion from under the hood drove me nuts.
Hah! Awesome. That made me laugh...
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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: Pale_Roader]
#1334669
11/15/12 12:05 PM
11/15/12 12:05 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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the slant in my duster is perfectly adequate with an A833OD and 3.23's and 25" tires....decent acceleration and not too buzzy keeping up with 70mph traffic. with 2.76's and a 904, I'd probably want to drop kick the motor as far as I could. can only imagine what it'd be like in a 400-800 lb heavier vehicle
although after having my '11 charger for a year now, the slanty is feeling quite underpowered, especially in 2-way backroad passing situations.
a 3.6L pentastar in front of my tranny/axle combo would rock in the duster....would probably hit the 13's and get an additional 2-3mpg over even the slanty....
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: Rug_Trucker]
#1334671
11/15/12 12:54 PM
11/15/12 12:54 PM
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Joined: Jan 2003
Posts: 9,875
Weddington, N.C.
Streetwize
master
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master
Joined: Jan 2003
Posts: 9,875
Weddington, N.C.
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I had an old 71 Dart /6 with a 904. I milled the head ~.080 and hand ported it and used a 2 bbl 318 on the old aluminum manifold with a 6 into 1 JR header and a single 2 1/4" exhaust with a dynomax turbo. Stock solid cam. It was pretty quick for what it was and got better MPG than the old 1 bbl stocker.
I built it only because it was the only mill in the Mopar family I hadn't tackled at the time ~25 yrs ago.
Last edited by Streetwize; 11/15/12 12:55 PM.
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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: DaytonaTurbo]
#1334673
11/15/12 01:18 PM
11/15/12 01:18 PM
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Joined: Mar 2007
Posts: 3,277
West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,277
West Coast, USA
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Quote:
Quote:
Thanks for all the replies guys, I think after all I've read and look at it just is not worth it to me to fool with the /6. Based on cost and results I believe I'd be better off just putting a v8 in and forget it. So the hunt begins for the right donor vehicle with a 5.2/5.9 magnum and a518. I really think I'll be money ahead and much happier with the end results.
Thanks again.
You won't regret it. I put a 5.2 magnum into my jeep instead of wasting more money on the carbed 4.2 inline 6 it had. I did carb and distributor and while it ran better, it was still a bagged out POS. You can use any year of 5.2/5.9 engine, but you want 92-95 wiring, computer and sensors if you want to keep the EFI and 95 or earlier transmission. Mine's a 99 5.2 running on 95 electronics.
After 8 something years of upgrading and tuning my /6, I sold the motor and am in the process of putting in a 90k mile 2001 5.9 Magnum. I'm keeping the serpentine belt and fuel injection. For now, I'm going to run a non-lock-up 727. Later, I'll put in a well-built 46RH. Thats the one that's a non-computer controlled overdrive with lock up torque converter.
After searching around for FI solutions, I ended up using the factory FI with some upgrades, as it turns out to be the lowest cost option that still has considerable tuning capability. I'm using a custom "Hotrod" wiring harness from Hotwire Auto, a rebuilt 1998 Ram 1500 truck 5-speed computer without security, and a SCT Tuner with unlimited tuning from Hemi Fever. These three fuel injection items ran about $1450, but it is pretty much plug-and-play now AND has the benefit of being highly tunable due to the OBDII design. When compared to the cost to the next lowest price alternative for a tuneable FI set-up, it's not a bad solution.
A good used complete take-out 5.9 cost me $400, add to that a new cam, timing set, injector change, the resealing of the motor, Shumacher engine mounts, Summit headers, misc parts and a good rebuilt 727. I have yet to buy a radiator, drive shaft and all the rest of the little stuff, which all adds up.
Eventually, I'll pull the motor back out, put in a stroker kit and upgrade to aluminum heads and a better intake. After that, a turbo or belt driven supercharger. The benefit of the later OBDII system is that all these changes can be quickly accomodated by simply using a wideband and the SCT to reprogram the computer.
Fortunately, I got a good price for my complete Slant set-up to offset most of the swap cost.
My point is, the cost to convert my car over to a good running fuel injected 5.9 Magnum is still below how much I put in my slanty over the years to get it to run really well. It was a fun motor and surprised a lot of people with it's performance for a slant 6, but it was just not satisfying enough at the end of the day.
Last edited by jbc426; 11/15/12 01:28 PM.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: jbc426]
#1334674
11/15/12 01:30 PM
11/15/12 01:30 PM
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Joined: Oct 2012
Posts: 1,106
Northeast
VincentVega
super stock
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super stock
Joined: Oct 2012
Posts: 1,106
Northeast
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I think the naturally aspirated /6 is just something to play with to see what you can do. I have plans in my head for something no one should do. Like I mentioned, I have an entire aluminum engine - they are open deck and known to not seal well.
So my bright idea, naturally, is to put a turbo on it. Nothing major. I always thought I could get away with a mild cam (maybe a custom grind heavy on the exhaust), porting, and perhaps 10psi max. Maybe I could find someone silly enough to try to oring it for me. It won't be wild, but I bet it could be made to run like a 300+ci /6 with lots of area under the curve.
and a turbo would muffle the angry warthog exhaust
Looking for 1975 through 1978 B body 4 door sedan sheet metal or parts cars - monaco, fury, coronet. Please let me know
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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: VincentVega]
#1334675
11/15/12 04:54 PM
11/15/12 04:54 PM
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Joined: Jan 2003
Posts: 5,902
Athens, Greece
Pyper70
master
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master
Joined: Jan 2003
Posts: 5,902
Athens, Greece
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I'll raise the stakes....if I could ever get my hands on the 265cid Aussie Hemi Straight 6...I would love to have that instead...
Family owned 1969 Charger R/T DualQuad 440/727/GVO/3.55s
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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: michiganhotrod1]
#1334678
11/17/12 08:04 AM
11/17/12 08:04 AM
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Joined: Jan 2005
Posts: 4,862
the frozen wastes...
Pale_Roader
Swears too much
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Swears too much
Joined: Jan 2005
Posts: 4,862
the frozen wastes...
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Quote:
I was a Chrysler service rep when those trucks were new; sold as the Ram "Miser". The automatic version was marginal, and the 4 speed (3 + overdrive) was pitiful. However, they had extremely tall rear end gearing (2.70), which was one of the main causes of the gutless performance. This was also near the end of the line for the slant, as emissions with carburetors had sucked what life there was out of these engines.
If it is an O/D trans, a rear end swap would wake it up a bunch without destroying fuel economy. Also helps to have a properly working carb.
Even if you do swap to a v-8, you need to do something about that differential.
Mark
Funny... i have a 76 Pinto 'MPG' model... with a 2.3L, 4-speed (non-OD) and highway gears. It actually gets pretty damn good mileage, even compared to other Pintos ov similar years... but ONLY if you drive it like a granny and stay out ov it. Detroit was definitely just taking a shotgun approach to efficiency back then... they didn't quite get it, even when they tried. The problem with my 'MPG' or your truck is that when you need to go somewhere... NOW... you've got to dent the floorpan and hold it there... and the mileage goes out the window.
A particular example ov my (well-running) Pinto failing its 'MPG' destiny... was taking a drive up the Kelowna Connector... this rather long, heavy-grade hill that goes on forever. I had to stay in 2nd gear the whole way because the car would not pull 3rd. I could even wring it out to redline, powershift into 3rd and i'd be losing altitude immediately. 22mph... on a major highway... in 2nd gear, almost 30 minutes. That cost quite a bit ov gas...
My brothers hotrod-6 69 Valiant was always 'on'... he needed to flog it to go fast... and that thing had utterly atrocious gas-mileage. It even had 3.21's and an OD 833...
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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: Pale_Roader]
#1334679
11/19/12 09:09 AM
11/19/12 09:09 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
My brothers hotrod-6 69 Valiant was always 'on'... he needed to flog it to go fast... and that thing had utterly atrocious gas-mileage. It even had 3.21's and an OD 833...
that's the driveline my duster has, with the stock slant 6...even foot to floor for a whole tank, I've never gotten worse than 19mpg with it in the 21 years I've had the car, and typically get 24-26mpg a tank in mixed driving...but passing on a 2 lane road does take a little planning, especially compared to my '11 charger....
I really would love to try a stock 5.7L in my duster behind that driveline....bet mileage would be about the same, but it would probably be a high 12 second car...
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: patrick]
#1334680
11/20/12 06:50 AM
11/20/12 06:50 AM
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Joined: Jan 2005
Posts: 4,862
the frozen wastes...
Pale_Roader
Swears too much
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Swears too much
Joined: Jan 2005
Posts: 4,862
the frozen wastes...
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Quote:
Quote:
My brothers hotrod-6 69 Valiant was always 'on'... he needed to flog it to go fast... and that thing had utterly atrocious gas-mileage. It even had 3.21's and an OD 833...
that's the driveline my duster has, with the stock slant 6...even foot to floor for a whole tank, I've never gotten worse than 19mpg with it in the 21 years I've had the car, and typically get 24-26mpg a tank in mixed driving...but passing on a 2 lane road does take a little planning, especially compared to my '11 charger....
I really would love to try a stock 5.7L in my duster behind that driveline....bet mileage would be about the same, but it would probably be a high 12 second car...
Yeah... just like my Pinto, even 'bad' mileage is still pretty damn good. How stock was your engine though? My brother had a 525 Demon on an aluminum Clifford, ported head, shaved head and block (at least 10:1 true CR,probably more... it hated 94 octane), Comps biggest solid cam, that hokey-ass 6-into-1 Mopar header, 2.5" mandrel pipe all the way back into a Borla, electronic ignition, recurved distributor, no accessories, etc. It was also lowered quite a bit, and had pretty small tires (225/60-15's up front), 2800lbs curb. It was a nice combo, and well-tuned, but definitely older-school than some here. Certainly not how i would build a hot 225 anyways.
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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: Pyper70]
#1334683
11/21/12 10:48 AM
11/21/12 10:48 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
Quote:
We used to tow fighter planes with tugs powered by /6 motors...those motors were pretty bulletproof. While a V8 would be more cost effective for more power, I have a soft spot for /6 motors. The hot-rod /6 motors are pretty unique... even if they aren't the quickest, they're cool in their own way, 
We had inline 6 Ford's in our TUGs at FedEx on the ramp. They were a hoot to drive. I have gotten a few of them to pop wheelies. Got in trouble a few times for it too. The TUG was governed at 15mph. still weighed about 2500lbs and I know I could pull 4 J-Cans with dollies...thats roughtly 3800lbs per can and 1200 per dolly...that comes to about 20,000 pounds. You can't argue with that workhorse.
with enough gearing, a briggs and stratton lawn mower engine could tow a semi truck....
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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