Re: Harmonic Balancer on (not) a Iron Duke 120?
The iron duke is a pontiac based motor, at 151 cid,....
Yer motor is a chevy 153 cid,....[/QUOTE]
Wow, there are a lot of misinformed folks out there. Thanks for educating this one! So I do NOT have a Iron Duke engine, crap, I was going to enjoy saying I did. I will enjoy telling everyone I have a Iron Duke's Daddy in the back, that might even be a good name for my boat. The stock version of my IDD does not have a harmonic balancer and just a chinsy, thin, easily rusted out pulley. As mine is rusted out and before I spend too much money on used version of what already rusted out (at least once) on my boat, can I upgrade tot a new HB made for a 3.0 140 Mercruiser? Will it fit and will it be better and do no harm?
Cheers,
Bill
[FONT="]As part of the decision to build the new L-4 engine, a review was made of recent General Motors engine designs. This review revealed a 2.5 Litre (151-cu.in.) L-4 engine was being produced by General Motors do Brasil. This particular engine had started life as a version of the early 1960s Chevrolet II 153-cu.in. L-4 which is currently produced by General Motors of Mexico. General Motors do Brasil had reduced the stroke from 3.25" to 3.00" and increased the rod length from 5.70" to 6.00" to reduce the vertical shaking forces inherent in an L-4 without counter-shafts. At the same time, they had increased the bore from 3.88" to 4.00" to maintain the displacement. Pontiac's analysis indicated that this engine had significantly reduced secondary vertical shake versus either the 153-cu.in. engine of the aluminum 2.3 Litre (140-cu.in.) engine then being used in small General Motors vehicles. In addition, since the 2.3 Litre was currently being produced by Chevrolet, the 2.5 Litre, being slightly larger, fit well into Pontiac's marketing plans.[/FONT]