Learn me the Super Duty 4 (Page 2/3)
Will SEP 13, 09:39 AM
Going to need a 3.0 shortblock turning 7000 RPM and a big ruppity rump cam to take advantage of that flow.

A stock Iron Duck block will not survive that.
olejoedad SEP 13, 10:56 AM
Wasn't the SD based on a Mercury Marine block?
fierosound SEP 13, 01:37 PM

quote
Originally posted by olejoedad:

Wasn't the SD based on a Mercury Marine block?



Nope. The Pontiac Iron Duke.
https://en.wikipedia.org/wiki/Iron_Duke_engine
wftb SEP 13, 09:28 PM
According to the talk that John Callies gave at the 30th anniversary, the Super duty 4 had identical bore spacings that the Iron Duke had and whatever else had to be the same so that it could be classed as a production motor. It was very close to being half of a 307 v8. They farmed out (get it?) the job of casting the blocks and heads to John Deere, the only way they could stay in budget. I don't know if anyone ever stuck a super duty head on an Iron duke or not, would like to see a thread on that.

The original iron duke 4 cylinder was made in the 60's and put in to Chevy 2's and some Pontiacs and gained a rep as being bulletproof. But it was never officially called the iron duke, that was the nick name that the magazine writers gave it. GM stopped putting it in cars but sold it to Mercury and OMC for use in I/O drives,usually with a 130 HP rating. Still being sold by Mercury and some were sold attatched to Volvo drive units. I think they now displace 3L.

[This message has been edited by wftb (edited 09-13-2019).]

fierosound SEP 14, 12:06 AM
Pontiac's write up on the Iron Duke (not a Chev 153)
https://gafiero.akroncdnr.com/docs/IronDuke.pdf
edfiero SEP 16, 02:39 PM

quote
Originally posted by wftb:

According to the talk that John Callies gave at the 30th anniversary, the Super duty 4 had identical bore spacings that the Iron Duke had and whatever else had to be the same so that it could be classed as a production motor. It was very close to being half of a 307 v8. They farmed out (get it?) the job of casting the blocks and heads to John Deere, the only way they could stay in budget. I don't know if anyone ever stuck a super duty head on an Iron duke or not, would like to see a thread on that.




Wow, never heard before that any of the SD parts were made by John Deere. If true, very cool. 'Nothing runs like a Deere"!!
wftb SEP 20, 02:33 PM
It is true, as told to us by John Callies himself. One of the Porsche team managers teased him about having a very nice tractor engine.

[This message has been edited by wftb (edited 09-20-2019).]

RWDPLZ SEP 20, 02:58 PM

quote
Originally posted by wftb:

It is true, as told to us by John Callies himself. One of the Porsche team managers teased him about having a very nice tractor engine.




Did he in turn compliment the gentleman's Beetle engine?
fierosound SEP 20, 04:44 PM
Hemming's article on the Iron Duke
https://www.hemmings.com/bl...vy-ii-four-cylinder/

2.5 SEP 24, 11:29 AM
Cool thread.