Whats the largest displacement size you can go to with a +4

[370banshee]

because 4 mm cranks are easy to obtain at a reasonable price... go with a 7 or 10mm and your looking at about a grand for a crank... plus alot more machining costs...

[banshee lover 2]

what cc would it be with a 4mm crank w/5mm rods and 60 over bore with a 40 over decked head

[BigG]

Originally Posted by banshee lover 2

what cc would it be with a 4mm crank w/5mm rods and 60 over bore with a 40 over decked head

How many rod length options do you have with a 4mil crank?

[banshee lover 2]

i dunno i saw a vitos 4mm crank that had 5mm rods on it for sale on ebay, already welded/trued too, thinking about getting it, im just wanting to find out the cc of that set up i was talking about

[370banshee]

the milled head and 115mm rods do nothing for your displacement

your probably looking at around 390cc's
if i rememebr correctly my 65mm bore 58mm stroke came out to 384cc

[flotek]

increasing the bore and /or the stroke is the only way your going to increase your displacement ... the rod could be 20 feet long and it wouldnt change your cc's

[BigG]

So in conlusion the 72mm bore on a +4mil is the largest = 472cc but thats in a DM or Supercub. Outside of those two you cant go as far as 72mm?

[flotek]

if your goal is going to go that big in displacement ..you might as well acheive it by adding more stroke and i thin kyoud get better results and less headache , like going for a 10mill cub ,just my opinion

[370banshee]

why do you need huge displacement anyway?

[BigG]

Well I was really just interested in the maximum limit of +4mil stroke but your right obviously its starts gettin risky. I wanted to build a +4 stroker and wanted to go more than 421cc so as I got into it I begain to be curious how far you could take a +4 stroke.
Thanks guys