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View Full Version : Whats the largest displacement size you can go to with a +4



BigG
04-08-2007, 10:55 PM
Whats the largest displacement size you can go to with a +4 stroke in a banshee?

flotek
04-08-2007, 11:28 PM
421 cc for a 68mm sleeve or more like 383 i think* for a oem stock sleeve bored out

370banshee
04-08-2007, 11:47 PM
what about a super cub? they are a 72mm bore right?

fiveOnick
04-09-2007, 12:27 AM
4mill DM, 78 bore.

BigG
04-09-2007, 09:49 AM
4mill DM, 78 bore.

DM?

What cc size would a 78 bore be

BigG
04-09-2007, 09:50 AM
what about a super cub? they are a 72mm bore right?

Is this a different type of cub

flotek
04-09-2007, 11:21 AM
oh shizzle, thats right i forgot about the super cubs 72mm bore with +4 stroker is
472.29cc

fiveOnick
04-09-2007, 12:53 PM
DM is the new cheetah casting, there are a couple people building them but its not something you can just buy right now. Its even more difficult than the super cub.

Ed Gein
04-09-2007, 01:21 PM
If you're going that big, why stop at a 4 mil?

BigG
04-09-2007, 02:25 PM
If you're going that big, why stop at a 4 mil?

Is 5 mil as reliable

370banshee
04-09-2007, 08:03 PM
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
04-09-2007, 08:14 PM
what cc would it be with a 4mm crank w/5mm rods and 60 over bore with a 40 over decked head

BigG
04-09-2007, 08:44 PM
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
04-09-2007, 08:46 PM
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
04-09-2007, 08:47 PM
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
04-09-2007, 11:34 PM
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
04-09-2007, 11:45 PM
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
04-09-2007, 11:53 PM
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
04-10-2007, 06:41 PM
why do you need huge displacement anyway?

BigG
04-10-2007, 07:28 PM
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

370banshee
04-10-2007, 09:30 PM
why do you need big displacement?

BigG
04-10-2007, 11:16 PM
"There's no replacement for displacement" Haha , no seriously just want to go big

sandman643cc
04-10-2007, 11:32 PM
heres 1 piece of my toy puzzle that im putting together, just bought it today
its big
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=007&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=170098342777&rd=1,1

370banshee
04-11-2007, 07:41 PM
sweet now you just need a $1500 crank and some billet cases...

flotek
04-11-2007, 10:30 PM
sweet now you just need a $1500 crank and some billet cases...


i think a 20mill cran k will be more than that ,but i could be wrong ,the matton cases will be a good 2 grand alone .and then nicasil and giant carbs giant intakes lockup ignition components ,beefed tranny ...and so on ,hope yo u know what your doing ...its going to be very expensive by the time its done but if yo uplay your cards right and have the finances it will be a freakin monster

BigG
04-12-2007, 01:24 AM
heres 1 piece of my toy puzzle that im putting together, just bought it today
its big
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=007&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=170098342777&rd=1,1
Wonderful....i didn't mean that big just a big +4

Ed Gein
04-12-2007, 10:15 AM
20 mil? Better take out a 2nd mortgage........haha

86ltracer
07-30-2007, 11:32 AM
if you get a +4 stroker and bore it .060 over, youll displace 390.87 cc. do that, and port the bastard and get some bigger carbs, and itll scream

SkinStroker
07-30-2007, 03:26 PM
Inland has a 4mm 76 bore mini twister

00tbanshee
11-20-2007, 09:06 PM
i agree with 86ltracer.thats what i have.in my opinion don't waste your money on a big bore kit.i run with banshee that have them and are running faster times with my little motor.

drag lt guy
11-20-2007, 09:24 PM
The biggest is 78mm bore cheetah DM's with a 58mm stroke (+4mm).