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Iron duke engine

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larry_from_maryland
Senior Member
Username: larry_from_maryland

Post Number: 202
Registered: 07-2003
Posted on Tuesday, March 01, 2005 - 11:59 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

There is a fellow getting rid of an Iron Duke engine 1970 on another site.Does anyone know what hes talking about?I left a message for him to come here.He says it came from a boat.
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eddie
Advanced Member
Username: eddie

Post Number: 44
Registered: 04-2003
Posted on Tuesday, March 01, 2005 - 12:15 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Iron Duke was an advetising name given to an engine used in sub-compact GM cars to differentiate them from the earlier Chevy Vega aluminium engines which were a disaster. The aluminium Vega engine did show some inpressive proformance characteristics as modified by Cosworth but was hopeless as a practical economy engine.
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doug11k
New member
Username: doug11k

Post Number: 2
Registered: 12-2003
Posted on Tuesday, March 01, 2005 - 09:15 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Larry,
I think the Iron Duke was a 4 cylinder engine used in the early Pontiac Tempests(maybe others) & was based on the 389 cubic inch V-8 cut in half length wise.
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eddie
Advanced Member
Username: eddie

Post Number: 45
Registered: 04-2003
Posted on Tuesday, March 01, 2005 - 10:25 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Doug,
You're half right. The early Pontiac tempests offered a slant 4 which was, as you said, vitually half a V-8. Actually a great little engine. In the 1960s it along with other smaller engines were over-shadowed by the more exiting V-8s. Early Tempests also featured a combo transmission/diferential theoretically providing weight balance to the engine in front. Sort of a poor man's mid engine car. The Chevy Vega in the early 1970's had an aluminium engine block.An engineering nightmare. GM was quick to point out that later 4 cylinder engines had cast iron blocks and emphisized the point by coining the nickname "Iron Duke" in their advertising. Later advanced engineering allowed engine blocks to be made of aluminium with great success.
I saw the thread that Larry is talking about. The guy was looking for a next to nothing solution for a cracked block in his 4 cylinder Mercruiser.
Eddie from Oregon
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ernie
Senior Member
Username: ernie

Post Number: 475
Registered: 01-2002


Posted on Wednesday, March 02, 2005 - 07:12 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

The iron duke was the late version of the original 4 cylinder Chevy II engine. (1962 vintage)It is a plain chevy 6 194 ci 230 ci 250 ci 292 ci missing it's rear 2 cylinders. The iron duke name came out in the late 70's when it showed up in the Monza's and Sunbirds with a cross flow head. It also ended up in the Fiero. Yes the iron in the name was so it wasn't confused with the Vega engine. Actually the Vega engine was real good at the end. GM put iron sleeves in it (finally) and that solved it's problems. Yes there was the Cosworth version too. However the stock Vega was also real nice with real cylinders. I worked for a machine shop and we sleeved 2 or 3 of these a week for quite a few years back in the 70's
Mercruiser used the Iron Duke as an IO. They actually ran real good. However they didn't have a real long life in salt water.
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larry_from_maryland
Senior Member
Username: larry_from_maryland

Post Number: 203
Registered: 07-2003
Posted on Wednesday, March 02, 2005 - 12:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Thanks for the answers.
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butch malo
Visitor
Posted on Sunday, January 29, 2006 - 07:10 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

In the early 80's I built an iron duke turbochrged engine for the purpose of high mileage. There was a future fuel ralleye using alternative fuel.

The engine was installed in a 1973 caddilac fleetwood broaughm (5600lbs).It dominated the field getting 45mpg and producing 450hp running on methanol.

The competition was canceled and no prize money nor any recognition due to the promoter leaving with all proceeds.

You can find some mention of the ralleye on mother earth news web site.Othernames in the feild Brock Yates,Lynn StJAMES,ETC.

Manufacturers included Ford,Chevy,GM,etc.with millions of dollar budget and lots of r&d.My endeavor started with a donated car and six weeks to build with no time to test but ended up overall winner with no recognition or money to market my ideas but it was fun .

Reply for more info.thank you.
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Robert Winternitz
Visitor
Posted on Friday, April 06, 2007 - 02:50 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Butch,
I'd love to hear more about that turbocharged Iron Duke pulling a '73 Cadillac and getting 45 mpg. The idea of getting a piece of classic Detroit iron to get that kind of mileage appeals to me. Besides, servicability must have been excellent with a small 4-cylinder motor in that enoumous engine compartment.
Rob
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thomas
Senior Member
Username: thomas

Post Number: 271
Registered: 07-2002


Posted on Saturday, April 07, 2007 - 01:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I can't help but wonder about the MPG claims. I did a search of Google and the latest Audi RB with a (dare I say hi-tech?) 420HP aluminum engine in a 3439 lb car got 16 city and 20 hiway.
The car costs $109K. This sounds like somebody got access to the Krell data base and (after the brain boost) just timkered the '73 Caddy together.......
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brad widstrom
Visitor
Posted on Monday, April 30, 2007 - 02:34 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Yes, but I see this is a marine engine website. There was an outboard motor in the early 70's that had been nicknamed "The Iron Duke" by its manufacturer. At least that was the name used in some of the print advertising. Believe it was a 150 hp Mercury. We had a Johnson 115 at the time which we thought was pretty sweet so the Iron Duke really caught my eye.
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jose de hoyos
Visitor
Posted on Saturday, June 16, 2007 - 10:44 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

where can i find a carburetor for an old slant 6 marine chrysler engine{has the intake upside down}
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Hman
Visitor
Posted on Wednesday, October 17, 2007 - 10:04 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Thomas,if your doubts from your April 2007 about fuel ratings haven't changed,check this out. I picked up an Olds 98 Regency Elite fully loaded,mfd 1996. powered with a 2.8 supercharged V6.At 55MPH I got around 22MPG,and at 70MPH I got 38+MPG according to the onboard computer.All factory components. No joke!
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Capt Jack
Visitor
Posted on Thursday, July 31, 2008 - 10:51 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I have an 89 4winns that used to have a 2.5 l inline iron duke buy gm was wondering if anyone knew where i might find a higher output 4 cyl that i could replace the old dead one with
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Will from seattle
Visitor
Posted on Tuesday, September 23, 2008 - 02:55 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hello, I am looking at purchasing a glassply boat from my boss, it has a 4 cyl, chev "iron duke" with a blown motor, apparantly heat exchanger went out and killed the motor. What is availability of the motor? could I get one from an old car, and use it in the boat? any advice is appreciated!


Will R. Seattle, WA.
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fastjunky
Visitor
Posted on Wednesday, January 07, 2009 - 07:01 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I use to work for a boat dealership, and using a car motor in place of a boat motor is not a good idea . Much more heavy demand is required of a boat motor. But my ? is the crank built heavier in a GM 2.5 marine motor then the automotive version? And if it is can it be a direct swap to upgrade the lower end of my 2.5 for my fiero motor }}}}
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george reading
Visitor
Posted on Saturday, January 02, 2010 - 02:25 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

took a 2.5 pontiac worked the block. 181 merc. crank installed. 11x brodix head installed. v8 chevy pistons installed. hilborn fuel injection installed. pulls 7,800 rpm in a midget race car lap after lap on a dirt oval. dont need to hear how weak the iron block is. its 183+ c.i. pulled 8,000 once and she really wanted to go, smooth as silk. next one will be 186 c.i. and more compression. this one has all but 14-1. the next one will have 16-1.
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John Sherwood
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Posted on Tuesday, February 23, 2010 - 07:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I have a 140hp Mercruiser, I believe it is an Iron Duke. I would like to overhaul this motor. What is the best place to get an overhaul kit.
thank you
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dick baner
Visitor
Posted on Monday, March 01, 2010 - 09:48 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I have a 1965 110 hp iron duke marine engine that is backfiring. Suspected a burnt exhaust valve but compression test showed #1-115,#2-117,#3-117,#4-110. Manual says 20% variance is acceptable. Are these numbers too low overall?
Any other suggestions?
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devilc9
New member
Username: devilc9

Post Number: 1
Registered: 06-2010
Posted on Thursday, June 17, 2010 - 01:41 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi I have a 1976 iron duke gm 2.5 lt 120 hp, the engine block is cracked any ideas where i can get another one, or can i use one from a car, and if so which cars had this engine.
thx
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david_in_ma
Member
Username: david_in_ma

Post Number: 11
Registered: 03-2010
Posted on Monday, July 12, 2010 - 04:11 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Just read this thread. I always called the Chevy II, 153" eng a "Chevy II". I believe Pontiac's 4 cyl was a totally different eng having 151". I think people just started calling both types "Iron Dukes", not knowing the difference. I believe the Mercruiser marine 181" is based on the chevy II. It has a larger bore, larger cyl barrel castings and I believe were cast in Mexico as well as the late '60s 153" engs were. I ran the 153" in my KK midget in the early '70s. Still have a few 153s & 181s, but am rebuilding a 110 Offy again. David
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eddie
Senior Member
Username: eddie

Post Number: 251
Registered: 04-2003
Posted on Monday, July 12, 2010 - 08:36 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

The 4 cyl engine in the early Pontiac Tempest was a slant 4 developed by literally lopping off one bank of cylinders off a V-8 block pattern. It performed well. Also, those early Tempests boasted a transaxle in the rear which was supposed provide weight balance, a sort of poor man's mid-engine car. A few years later the Tempest evolved into a larger model sharing the same platform as GM's Chevelle, Skylark, and Cutlass. The Slant-4 dissappeared with little notice. Tempests offered another maverick of an engine in 1966, an overhead cam straight 6 cylinder. It also disappeared in 1970 as there was little interest in it.
Chevrolet introduced the sub-compact Vega in the early 1970s which had a 4 cylinder aluminum engine block. The early Vega engine was a disaster as a production engine, althought it had potential as a low weight to horsepower racing engine as demonstrated by Cosworth as a modified twin overhead cam engine. GM scrambled to replace the aluminum engine with a cast iron one, using the advertising name "Iron Duke" to lure back customers who were dissapointed with the earlier aluminium engine.
The Pontiac slant-4 and the Iron Duke a decade later were very unrelated other than they were used in Pontiacs, the Iron Duke in the Vega sized Pontiac Sunbird.
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HEATH VON STADEN
Visitor
Posted on Monday, August 09, 2010 - 05:14 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I HAVE 2 IRON DUKE MOTORS 1 IS A BOAT MOTOR COMPLET RUNS THE OTHER IS A 1979 AMC MOTOR OUT OF A STIRIT WITH NEW HEAD AND REBUILT LOWEREND WOULD LIKE TO GET RID OF THEM
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duktapekid
New member
Username: duktapekid

Post Number: 1
Registered: 02-2011
Posted on Monday, February 28, 2011 - 11:38 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

THE IRON DUKE IS 151CI OR EXACTLY HALF A 302 z28 CAMARO ENGINE, 4" BORE, AND 3" STROKE, VERY QUICKI NOW HAVE A 3 L ONE IN A BOAT THAT IS THE SAME ONLY LARGER INSIDE. DOES ANYONE KNOW WHAT THE BORE AND STROKE OF THESE IS. DO THE BLOCKS HAVE THICKER WALLS SO IT COULD BE BORED EVEN MORE THAN THE 2.5 ? I WOULD LIKE TO KNOW TO SEE IF IT WOULD MAKE A BETTER BLOCK TO START WITH FOR A DRAG RACING ENGINE. ANY HELP WOULD BE APPRECIATED. THANKS, BILLY 813-610-1344
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doug22h
New member
Username: doug22h

Post Number: 1
Registered: 03-2011
Posted on Saturday, March 12, 2011 - 04:28 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

the 3.0L or 181 is a better motor then the 151 it has a 4'bore and a 3.625 stroke and it use's a 6 inch rod also, the crank is the same as a super duty crank it use's the same rod as a small block chevy,and yes i have one of these engine, this motor well smoke the 151 like crazy
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david_in_ma
Member
Username: david_in_ma

Post Number: 14
Registered: 03-2010
Posted on Monday, March 14, 2011 - 07:40 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

A lot of mis information on this thread.
Doug22h: All my 181s have a 3.600 stock stroke. You would have 182+" if the stroke was 3.625. The conrod is nothing like a SBC. They are prox 1.125 long at jrnl. The SBCs are prox.945. I wouldn't suggest running w/ that much axial play. The rods are 5.700 C/C, not 6.00. All SBCs I've seen have 5.700 rodsC/C length, except 400s. There are aftermkt 6.00 rods commonly installed. David
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dcwendorff
Visitor
Posted on Friday, November 25, 2011 - 07:36 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

1976 17ft tahiti i/o deep v hull,4 cylender murcruiser,the motor is good the outdrive needs work 400 bucks and its yours
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michaellagueux
Visitor
Posted on Sunday, January 20, 2013 - 09:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Could one of you folks help me figure out what I need to put a marine iron duke in my cj3?
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michaellagueux
Visitor
Posted on Sunday, January 20, 2013 - 09:41 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Could one of you folks help me figure out what I need to put a marine iron duke in my cj3?
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s10builder
Visitor
Posted on Friday, August 30, 2013 - 12:24 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

where can you find the 232 hp iron duke people are posting about id love to get my hands on one.

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