Increase displacement?

Some had been expecting a larger capacity engine in the 2007 VFR, I was wondering, out of pure curiosity, whether anyone had attempted to increase displacement on a VTEC V4 through boring/stroking or both? I searched through the threads and couldn't find any references to such a project being undertaken.

Regards,
Bruckner

 

Dynamo Humm makes a big bore kit but I don't know anyone who has one.

http://www.dynamohumm.com/Scripts/prodList.asp?idCategory=20601

I could give a crap about more power. The VFR is not underpowered. If you can actually ride this bike to it's limits on the street, you are a much better person than I am. Give me a VFR that weighs 450lbs with the same power it has now over 130HP weighing 530lbs any day.

KC-10 FE out...
lane:

 

I guess I should have stressed with more clarity that I was asking this out of curiosity, I didn't mean to start a debate on whether or not the stock motor makes enough power, I'm glad you're content with your VFR's performance. Thanks for the note anyway, I will look up this tuner.

Regards,
Bruckner

 

I wasn't taking a shot at you & I apologize if you took it that way. I was writing a broad generalization to all VFR riders.

I'm thinking it will be in the neighborhood of $3000 to actually put that kit in a bike.

KC-10 FE out...
lane:

 

Ha ha ha... A big bore kit will cost you the kit and the machining, and disassembly-reassembly labor, and the ...etc., etc., etc. Pretty soon the cost is over the face value of the bike. Hell, you may as well buy a bigger bike! There is some replacement for displacement. Better breathing! See my post. Try it - it's cheaper and you'll be satisfied with the results...unless you're only concerned with numbers on a dyno chart for the sake of bragging rights.
You can do it in an afternoon.

 

Got your thread Sepp thanks.

How about fitting an ST1300 V4?? That would be fun!!

NOTE: No need to mention it won't fit or that it won't make financial sense, I was just k-i-d-d-i-n-g, in case you haven't noticed.

Regards,
Bruckner

 

A design issue peculier to the VFR is the use of low-friction aluminium/ceramic composite cylinder sleeves that have no top flange. Traditional cylinder bore bar and hone tools may not work correctly on this material. One would have to be careful to engage the right cylinder boring technician acquainted with this potential issue. I'd bet your average small block Chevy engine builder would screw this up.

 

Unless of course you can do it yourself.....
then you just have the price of the kit
I wouldn't do it, but then hey, to each their own

 

just to run with it...
if you picked up a crashed, with good motor ST, and a VFR with motor problems, you could do away with the financial issues

it is so tight in there now, I can't imagine it fitting, but I have been wrong before, and people have been known to modify a frame to their purposes...

without looking at a dyno chart, I would guess you would want to work on the tune of the ST motor, to make it more "sporty" than its design; but hey, if you have the talent and determination to deal with the other issues, I would guess you could deal with that:smile:

 

Huh?
...and if I could harness anti-matter drive I could fly to Uranus in a week!
Many things are hypothetically possible - it's the real world engineering problems that put your daydreaming in the butt can.:attention:

 

The real issue is if you had a donor bike could you drop a Gen 5 motor into a Gen 6 frame.

 

Ahhhh... The million dollar question. Someone with more money than me should try it.

 

Someone with more money and time than I have should try this and let us know how it goes.

 

Time is better spent riding, or figuring out new ways to confuse my boss.(the riding) is a better cause. I don't have to try too hard on the boss.