grumpyvette Posted March 17, 2003 Share Posted March 17, 2003 look at the rods , both the (h) and (I) beam AFTERMARKET RODS are FITTED with bolts that SCREW into the rod body from the bottom of the rod cap the CENTER ROD WHILE NOT A CHEVY ROD shows the built in flaw that that style rod has in that any grinding for extra clearance on the head of the rod bolt weakens the rod bolt at least slightly, its not so much the (I) or (H) design as it is the ROD/NUT method of holding the STOCK style rods together, but to answer your question, [color:"red"] yes as a general rule getting the style rod that has a 7/16" ARP rod bolt that screws into the rod body significantly increases the strength of the rods over the 3/8" stock chevy style rods that use nuts to hold the rods together [/color] also keep in mind that a 7/16" rod bolt is 36% larger in area than a 3/8" rod bolt and tends to be made out of far stronger steel, the total differance in strength can easily EXCEED 200 % stronger rods for the 7/16" cap screw rod verus the stock chevy rod LOOK CLOSELY AT THE LINK BELOW,ALL THE STRESS ON THE LOWER END IS WHERE THE ROD BOLTS OR THEIR HEAD/NUTS NEED TO BE STRONGEST http://www.engr.rutgers.edu/~llongo/8K.html Quote Link to comment Share on other sites More sharing options...
Brad-ManQ45 Posted March 18, 2003 Share Posted March 18, 2003 Thanks for the info Grumpyvette... Now for a discourse on H vs. I beam configurations. Pro's Con's, which may be better for RPM's and which may be better for big boost turbocharged cars.... This is a discussion I've been waiting for! Brad Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted March 18, 2003 Author Share Posted March 18, 2003 heres some info to read, http://www.aros.net/~rbuck/rick/rodstudy.htm http://victorylibrary.com/mopar/rod-tech-c.htm http://www.stahlheaders.com/Lit_Rod%20Length.htm http://www.grapeaperacing.com/GrapeApeRacing/tech/rodslength.cfm http://www.grapeaperacing.com/GrapeApeRacing/tech/rodsstock.cfm http://em-ntserver.unl.edu/Mechanics-Pages/Luke-schreier/unzip/Tension%20and%20Compression%20in%20Connecting%20Rods%20VI.htm http://www.laffey.co.uk/budget/ratios.htm http://www.arp-bolts.com/media/pdf_files/RB_16-18.pdf short answer, if you can afford it the minimum mod to stock rods would be adding ARP rod bolts and resizeing , pollishing and mag. checking the rods for flaws , but youll soon find that the cost of the bolts,machine shop and testing comes to more than a good set of 7/16" rod bolt equiped (SCAT,EAGLE, or CAT rods)ALL of which are stronger than the factory 3/8" bolt rods EXAMPLE, theres no way to even approach the quality and strength of these rods for the same money starting with stock rods and stock sbc rods are optomistically rated at 450-500hp AFTER ROD MODS now most machine shops will charge $120-$150 to install ARP rod bolts, $150 to polish and inspect and resize stock rods at the ABSOLUTE MINIMUM so by the time you add in brass piston pin sleaves, oil holes and rough ballanceing youll have more money in INFERIOR RODS if you use stock factory rods Description: C-C Length: 6.000", Gram Weight: 645 Large Journal: 2.100" Crank Pin, Piston Pin: 0.927", B.E.Width: 0.940" Horespower Range 700+ HP at 8000 RPM Note: Horespower range is affected by Rpm, Stroke and piston weight "ESP" Features and Benifits 2-Piece forging for increased strength ARP 7/16" 8740 capscrews bolts standard (190,000 psi) Silicon Bronze bushings for floating pins. Multi-stage heat treated . Certified 4340 steel, vacuum, decreased remove impurities. Each forging is X-rayed, sonic tested & magnifluxed to insure quality. All surfaces are 100% machined. Shot peened to stress relieve the metal. Stroker Design provides cam clearance for 3.800 on small block Chevy and 4.250 on big block Chevy engines with no modification These connecting rods provide the strength & durability required in unlimited engines at a sportsman rod price. 8 New Rods Ready to run, Installation instructions & bolt lubricant included CNC-Motorsports Grantees's all Eagle products. Please Call 1-605-692-1697 For additional product information $20.00 SHIPPING!! Quote Link to comment Share on other sites More sharing options...
Brad-ManQ45 Posted March 23, 2003 Share Posted March 23, 2003 Thanks Grumpyvette! Finally found the information stated in an article due to your link. So that no one elese need look through it all for one piece of info: For Boosted applications, H-beam rods seem to be the way to go, it appears they can be a bit lighter than I-beam and still handle the larger low-rpm compressive loads, or the same weight and handle even more. For high rpm engines, either rod works, but once again, the h-beam will be a bit lighter. Thanks again Grumpyvette! Brad Quote Link to comment Share on other sites More sharing options...
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