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Pauter Connecting Rods
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w/ ARP rod bolts

A Pauter S14 connecting rod My 2.5 L rebuild was prompted by a "spun" #3 rod bearing. Because the bearing had spun, it was doubtful that the #3 stock rod could be reused. This prompted me to order a set of Pauter rods through a friend of mine who is a distributor for Pauter . I did not really get the Pauters because I thought they would be better than the stock rods. By many accounts the stock rods are strong enough to withstand a beefed up 2.5 L S14. But buying a new set of Pauters was actually cheaper for me than trying to acquire and recondition a used set of stock rods. And although the stock rods work well, once you hold a nice custom rod in your hands it is difficult to resist. Also the Pauters are lighter than the stock rods which is a plus at high RPM's.

The Pauter rods come with ARP rod bolts. There is little doubt that ARP fasteners are among the best in the industry. And rod bolts are probably the single most stressed fastener in any high revving engine. Thus it makes sense not to cut any corners in this area. A good set of rods with a strong big end and a quality set of rod bolts will go along way towards letting your engine stay in one piece as the rev's climb. There is also a high probability (in my opinion) that the rod bearing failures which S14's are known for are at least partially caused by detonation. A strong bottom end will stand a much better chance of surviving occasional detonation.


The general specifications for the Pauter rods were written on a card which came with my order. These values are apparently measured for every set of rods that they produce - truly custom. I have included the mass values for the stock BMW S14 rod as a comparison point: ,/font>

Pauter Rod Specifications
Big end mass 409 gm 466 gm (stock)
Total mass 579 gm 665 gm (stock)
Center-to-center length 5.670 in
Small end diameter 0.8667 in
Big end diameter 2.0472 in
Small end width 0.941 in
Big end width 0.940 in



The stock S14 rods after reconditioning Here we see my original BMW connecting rods, which I brought to my trusted machine shop so that they could check the big ends for "out-of-roundness". I figured that one rod would be bad but maybe the other three could be salvaged. The machine shop said that indeed one of the big ends was slightly out of round, but that it was no big deal to fix. They felt the damage was not nearly bad enough to warrant throwing the rod away. The way they fix the big end is to machine a very small amount off of rod cap. This has the effect of making the big end ID undersize. Then they bore/hone the big end back to its nominal ID, but in such a way that the hole is offset, away from the pin area. In this way they maintain the original rod length to within 0.0005". I had the rods reconditioned at a very reasonable cost. But there is a strong feeling among the experienced S14 engine builders in this country that once a bearing is spun, the rod is junk. Thus, whether I would ever use that particular rod again is unclear. A new set of rods is not "that" expensive - $1000 will buy you a very nice set of rods from several respected manufacturers (Pauter, Carillo, Crower etc.).

Pauter rod compared to stock unit »

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