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I beam conrods

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722 views 9 replies 6 participants last post by  Dickieboy  
#1 ·
#6 ·
Been looking at this myself (94mm pistons) as I've just bought a 78.4 crank from beetleragtop (cheers dude). Did some searching and got: "use whichever length makes your deck height and compression ratio come out the way you want - the difference in characteristics between a 1.75 and a 1.78 rod-length-to-stroke-ratio is insignificant"....

and...

"With B-pistons and a 78.4 crank you're looking at 5.5" for a good deck measurement. If you are trying to configure for a specific rod ratio, don't bother. There will be no measureable difference in performance whether you get short 5.349 rods, 5.4 rods, 5.5 rods or even 5.6 rods. When you stroke a VW, ignore rod ratio. Choose rods to assist in engine configuration and deck."

As such I'll be going for 5.5 rods (or rather Laurie will be when I get it to him.....)