Damn it's like that huh!!!??? sh*t I'm def gonna Follow you guys advice then! So stoking it out should do the trick then? I'm all over the place with this decision lol, way too many options haha but that's always a good thing rather then be limited. Idk too much about turning it into a stroker but I've heard good things from the little bit I've read in the past... How should I go about it & a guesstimate of cost would be great also. I'm learning more & more everyday I'm in this forum. Thanks!
Big bore kit differences
- Thread starter *Quad*King*1986
- Start date
Says the guy with Wampus cylinder's on his banshee
*Quad*King*, it's like this. Aftermarket parts have certain drawbacks. If you're willing to live with those drawbacks, there are certain advantages. One of the drawbacks to a BBK (pretty much all of them) is that the pistons are already so much larger than stock, there's not a lot of room for overbores. The BBK's start at 72mm and go; .25 OS, .50 OS, and 1mm OS. You get the factory life plus three possible overbores. With proper maintenance cylinder lives should not be used up that fast...
Vito's casting flaws are HORRRRRRRRIIIIBBBBBLLLLLEEEEEEEEEEEEE. However, there is a silver lining to that. In leaving all of that casting out there, they left enough material for mild to wild customization. Basically, right out of the box, a vito's kit will not put out as much power as a healthly ported stock cylinder BUT, properly ported a vito's cylinder will roost a stock cylinder mainly on bottom end.... I've rode healthy ported stock cylinders and I'm rocking a vito's BBK. There's a reason why... the BBK has TONS of bottom end power and still revs out where as a stock cylinder is basically trading off bottom for top when you port.
There are other options other than just a stock or vito's... if budget is unlimited so are the choices basically.
Airsal kits do better at passing off heat than steel lined cylinder but you have the drawback of having to pay to get it renikasil'd if it blows.
La sleeve/CT racing kits are a NICE upgrade but pricy.
Getting your stock cylinder resleeved isn't a TERRIBLE idea. It doesn't have the advantage of the updated port layouts but it does have the cost advantage. The resleeve kit can be purchased for about $200 and then you just have labor for sleeve pressing and getting it ported. You do end up with a real sleeper look to it though....
SICIVICDUDE- thanks for the input, very informative... Now comes the hard part of making a decision. Like you said earlier every thing has advantages & disadvantages. I'm looking to spend around $500-$600 max. What can I do with that budget?
That basically leaves you with three options and one of them is a long shot....
option #1 get a bitchin' port job. It's going to perform better with the other parts you've currently got. A BBK loves a good pipe and carb, they don't do well with without them.
option #2 Buy a BBK and put it on the shelf. Begin putting together the other parts over time. Not going to be quick and an unported stock top end isn't going to get the most out of a good pipe and 35mm carb...
option #3 try to put everything together second hand/used and do most of the work yourself. Sometimes you end up ahead, sometimes not. That's what I did and ended up ahead.... Crapshoot, might end up with some junk who knows.
Actually, there's a 4th option. Start gathering hopped up performance parts that will work well on a bigger engine later. A right bend pipe, PWK 35 carb, aftermarket airbox would all be good upgrades for a ported stock engine but REALLY come alive with a BBK.
If you have a budget of $5-600, this is probably the route I would take...
If you have a budget of $5-600, this is probably the route I would take...
SICIVICDUDE- thanks for your input, very informative! Now comes the tough part of making a decision. Like you said earlier, everything has it's advantages & disadvantages. I'm looking to spend $500-$600 maximum. What can I do/should I do with that sort of budget in your opinion?
Sorry about the double post, my phone is acting strange for some reason... So okay your saying to just maybe forget the port and just start getting upgraded parts? But let's say just for instance that I do bore out my stock cylinder on the set up I got now, what size should I go for? And if I also got it ported on ontop of that how would it perform & do you think that's a good option nd also in my budget?
Do not get it bored out any larger than is necessary to remove damage! All you're doing is wasting engine lives later down the road.
I'm not saying forget the port, I'm saying aftermarket parts (specifically pipe and carb) net the largest gains once you hit the "normal" limits of airbox lid off and rejet... and will ALSO work really well on a heavy portjob or big bore kit. I'm running a F7 pipe and PWK35 carb on my Vito's, I was rocking the same exhaust and carb on a heavily ported stock bore engine and it too ran great.
Alright I'm following you now, I'm going to look a little more into this and try to make up my mind. I looked at your "sig" and it seems to me you got yourself a hell of a ride there, I'm slowly working towards something like that too!
If I get the BBK you said I can only have 3 overbores right?... Well I could always just re-sleeve it if I had to right? Can you re-sleeve a vitos BBK?
Yeah, you can resleeve a BBK cylinder, it's just pricy to get done.
I don't have the capacity to install a sleeve. You can get a sleeve pressed by a machine shop (or one of the builders on this site)
It's comparable. The price may be a little more to port match to a ported big bore kit but it's not going to be exponentially more to resleeve a BBK.
The shortage was in forged pistons, specifically the Wossner pistons. Vito's never ran out of their cast pistons and I believe vito's now has their forged pistons back in stock.
Awk is right, piston shortage is something to think about when considering a BBK.
Oh wow I was unaware of that info! Thanks AWK/CIVICDUDE your knowledge is greatly appreciated I:I
this is a good thread with lots of bbk info, lets keep it up so more new guys can read up and make informed decisions I:I
I agree SUPERNOOBER!... Well most people think that when it comes to upgrades the bigger the better, is that true for carberatures? Let's say im running a stock cylinder thats maybe bored .20 and then I get a good port job done. What size would you recommend for a carb? Oh and also your running V3 reed's... Would a 35mm be too big for it, would it affect it's overall performance?
