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#1
02-09-2009, 11:01 PM
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Basic question about rods
I've had rods re-sized before putting them back in before but I don't really know what that is. So maybe somebody would be kind enough to enlighten me.
Robert |
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#2
02-10-2009, 12:08 AM
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a machine shop mills some off the cap and or the rod big end, then resizes the rod journal end of the rod.
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#3
02-10-2009, 07:28 AM
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Will you be putting your motor back together, or will a shop assemble it for you?
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#4
02-10-2009, 11:11 AM
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I once visited an (mass) engine rebuild shop and stood beside a guy resizing rods, it was amazing. For measuring. he had a cone shaped device that he slid the rod on (it was marked with demensions), it literally took him less than 2 minutes to resize a rod! -Jim
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#5
02-10-2009, 03:20 PM
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Quote:
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#6
02-10-2009, 10:18 PM
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Is it just the cap end that becomes deformed? Seems like the new bearings wouldn't fit right afterward if the hole was cut offset to the original parting line. I'm sure they don't recut the locating groove too.
Robert |
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#7
02-11-2009, 03:26 AM
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Both rods and caps get deformed. More than .005" is never milled from the cap (and maybe also from the rod) for resizing- if more than that is needed, the rod gets scrapped. Bearing tangs will fit fine- the locating grooves are sized "generously" enough, depthwise.
__________________
Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons? ... or has built a record breaking DOHC hemi four cylinder Pontiac? ... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967) |
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#8
02-11-2009, 12:42 PM
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Alot of builders say there's nothing wrong with resizing cast rods, and IMO they're good for grocery getters which will never see more than 3000 rpm, but I'd pass on them if you're planning to rev your motor over that. The price of a new set of 5140 forged rods is maybe $50-75 more than what it would cost for a set of cast resized rods, but they are much stronger and won't fail if you buzz them to 6000 rpm.
Geno |
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