+4 crank, pros and cons?

blasterman87

New Member
Nov 17, 2008
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i know it raises your cc's, and adds power but how exactly? does it raise compression? i know with a +4 you have to trench the cases but how hard is this? and what is a good +4 to go with??
 
Thats a good question. I would also like to know how much it helps, also I would like to know how easy it is to install?
 
I have the +4 in mine you would be better off to send the cases off to get the trenched you also have to get 2mm cut off of the head to allow the piston to go in it. I have the hot rods +4 crank and i sent it off to Wildcard to have it trued and welded up
 
Would flo tec be able to set me up for the +4 crank shaft because I allready plan on sending my 240 jug to him? Did you notice any big diffrence from the +4 crank?
 
a 4 mil crank is definately better than stock, but is it better than a 3 mil Vitos drop-in probably not, and you can clean up the interference with a file and save yourself some bucks, not trying to take any biz from the builders here just tryin to help
 
an extra millimeter of stroke the 4 mill offers over a 3mill probably wont be felt by the average guy,but every bit helps in the end ..i have built and assembled them about anyway there is ,trenched ..not trenched ,cut head, custom gaskets and or spacer plates
 
I didnt think the rod would clear in a 4 mil so you had to trench thats why I always used Vitos that and hot rods insist on using chinese bearings
 
yeah so the 4mil isnt something i could do myself? if i go with the vetos 3mm do i have to shave the head or what? so the stroked crank is actually longer than stock so why shave the head isnt that backwords?
 
well technically you need to shave a blaster head because it isn't designed from the factory for performance, with that being said a Vito's crank comes with a spacer plate that takes up the 1.5 mm that the new crank raises the piston so you get it and use the plate and gaskets and away you go, now all the technical jargin will happen about squish and port timing
 
Either way when you stroke your blaster 3 mil, or 4 mil you need to do some work. +3 requires filing the cases and in the best case porting to match and taking metal from the head rather than using the provided spacer plates. The 4 mil requires trenching and metal taken from the head also but I would rather the 3 for reliability.
 
I didnt think the rod would clear in a 4 mil so you had to trench thats why I always used Vitos that and hot rods insist on using chinese bearings

sadly both cranks are made in china and their bearings
 
so whats a good 3mm stroker? i want it to last and is there any write ups on installing a stroker as far as the spacers and porting that needs to be done and why? im just trying to understand how they work
 
bot hcranks hold up well but i like the vitos 3mill stuffer best ..but theres loads of info to hunt for all your answeres ,id try the search function under stroker and see what you dig up
 
Taiwan is the old outsource for Japan, now them like the US has found Chinese junk cheaper, its not the crank I have an issue with its the bearings, Taiwan is closer to being with us than China they hate China
 
The bearings should not be the issue if you know how to jet it correctly. The issues that I've had with the Vito is that they grind off the bottom of the rod and that is where we've seen the failures, on the rod.
 
you are correct but I think they have the same wall thickness as a stock rod they use a smaller rod bearing to keep that Dim. the same, I bought a stock needle bearing and it wouldn't fit and Vitos told me they are not interchangeable
 
heres some info if any one is interested :

Taiwan (historically 大灣/台員/大員/台圓/大圓/台窩灣) is an island in East Asia. "Taiwan" is also commonly used to refer to the country governed by the Republic of China (ROC) and to the ROC itself, which governs the island of Taiwan, Orchid Island and Green Island in the Pacific off the Taiwan coast, the Penghu islands in the Taiwan Strait, and Kinmen and the Matsu Islands off the coast of China's Fujian Province. During the Chinese Civil War and World War II, the Kuomintang (KMT) party gained control of Taiwan from the Japanese in 1945 but lost control of mainland China to Chinese Communist Party 4 years later. The KMT government fled to the island of Taiwan and re-established the ROC capital in Taipei. The island groups of Taiwan and Penghu (except the municipalities of Taipei and Kaohsiung) are officially administered as ROC in Taiwan. In practice, almost all government power is exercised at the national and local (city/county) levels.

The People's Republic of China (PRC) claims Taiwan as its province although the PRC has never controlled Taiwan or any of the current territory commonly referred to as "Taiwan". The PRC claims that Taiwan has been a part of China for hundreds of years.

weather you accept tha taiwan is owned ran and governed by china and is actualy considered the ROC(republic of china) doesnt really matter i n this case becuase the fact remains neither crank is amercian made ,both cranks will work fine though ...in my own experiances* ,ive seen more issues with the hotrods than i have with the vitos coming apart or failing