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FIDOSOL
09-07-2008, 09:12 PM
Is the XB9 engine the same as the XB12? Obviously there is a displacement difference, isn't it the same block though? I mean in the way that the chevrolet 350SB and the 400SB are the same block so you can actually bore both of them out to the same size as opposed to one larger than the other...

TMC
09-07-2008, 09:20 PM
Kinda like chevy has a 454 small block and a 454 big block?

FIDOSOL
09-07-2008, 09:28 PM
There is no 454SB...454 has always been a BB... but maybe one hell of a stroker could make 454CI but it wouldn't be very reliable...

Just wanna know about the XB9/XB12 so I know what to save up for...

TMC
09-07-2008, 09:37 PM
what are you trying to do?

and here's your 454 small block
http://www.hotrod.com/techarticles/engine/113_0307_454_small_block_crate_engine/index.html

FIDOSOL
09-07-2008, 10:07 PM
The reason I was wondering about the block difference if any in the XB9/XB12 is because I want to make it a 90" monster.

That's dirty, doesn't fall into the stock in a vehicle category, but then again I didn't specify that...

Congratulations you just made my wife's hit list...

I have a 78 Chevy Cheyenne 4X4 that I wanted a new engine for...



NO REPLACEMENT FOR DISPLACEMENT!!!!!



OH BTW, hookin' you up with a [up] for that astounding revelation of SB information.

buell007
09-07-2008, 10:19 PM
the bore is the same its the stroke that s the diffrence

06xb9r
09-07-2008, 10:24 PM
You'll have to stroke it. With available parts, the largest bore on a 9 takes it to 1200cc...on the 12 it's 88" I think.
You'll have to put a 12 rotating assembly in it

The 350&400 sbc blocks are not actually the same casting, just the same size on the outside. You can't bore a 350 out to 400ci. The 400 has a much larger stroke and a larger bore to start with. I don't think you could even take the 350 block out to the stock 400 bore, you would have to take 1/8" out of the cylinder

I think(not completely sure) the Buell cases are the same, 9&12, the entire cylinder is just swapped with a big bore kit

FIDOSOL
09-07-2008, 10:36 PM
If the cases are the same then the big bore (1474cc) kit for the 12 would work on the 9 as well right? What mods would I need to make it work?

TMC
09-07-2008, 11:05 PM
I'm building a 90", there is a great deal involved with doing a 90" motor I've built a couple of 88" motors in my past

LeFox
09-08-2008, 09:58 AM
1200cc Kits With Axtell Nicom Plated Aluminum Cylinders. Black Finish Look.


These kits take your XB9 out to the maximum bore size you can safely get in your stock cases. The result will astound and amaze you, as the lightweight XB9 really responds to the additional displacement. Of course, this engine kit comes with the finest quality components money can buy: Axtell iron lined or nicom plated all-aluminum cylinders, matching forged Hurricane pistons with tool steel wrist pins, Total Seal rings, and Cometic EST gaskets! Note: case boring is required for installation.

All-Aluminum construction offers the lightest weight and best heat dissipation. Other powder coat colors available, please call for details.

1200cc Big Bore Kit
3-13/16 bore Axtell Nicom plated aluminum cylinders
10.5:1 pistons, pins, clips, rings
head and base gaskets

case boring required:
Accurate and precise case boring is critical to the success of your big bore project! Twin Motorcycles has extensive experience in this specialized procedure and will bore your cases on a state-of-the-art CNC machine for unsurpassed precision and quality.

http://www.twinmotorcycles.nl/webshop/artikelen/1310847D-C65D-4948-B914-B116435EC9C1.jpg

FIDOSOL
09-08-2008, 10:51 AM
So is the difference just the case then? If so, anybody got a price on the XB12 case.

sinpieces
09-08-2008, 11:51 AM
No no no.... but, i'll leave it to Foxie to explain this.
He is just doing it so nice whenever he do something.
+ that he knows it better than i do. All i can say, it'll cost lots of money and it's really a big work. What makes me see the problem, except for catshingas, is the engines lifetime. Imagine the wear of the parts if cranking the hell out of it. Puh,... money money money. Always funny, in a poor mans world... Ah, you know the rest.....

LeFox
09-08-2008, 02:36 PM
So is the difference just the case then? If so, anybody got a price on the XB12 case.
if it was this easy...don't you think there would already be a couple of them riding around? :p

but i don't know enough details of this mod to give you enough technical info...

sinpieces
09-09-2008, 09:11 AM
Hey Foxie and Fido,

i've been looking, in the near past, to do this.
As i understand and see it now. It is ok to do if money is not an object. It will cost a small fortune to make it right, really important to find a workshop with correct skills. Engine lifetime is drastically reduced if, constanly using power above 5500 rpm. Secondhand value heavily risks to be worse. Later on trade in deals - you can probably forget. I believe ported heads + a new cam is the way (+ remapping) to go. That's it and if it won't do, change bike. It's important to get the honesty of what the risks of engine wear is also, atleast i think.

FIDOSOL
09-09-2008, 12:14 PM
Hey thanks sin, I hadn't decided yet if I wanted to really do it or not, this was more of a feeler to figure out which direction I want to go, new bike or modd the hell out of the one I have, I'm thinking new bike since the wifey already promised me one. The only problem is that the object of my desire, naked beasty motor hell bike is not a Buell, the 1125R/CR really disappointed me visually, anyways, I'm going to test ride the Benelli 1130 Cafe Racer when I get across the pond and take out an 1125R/CR as well, hopefully all in the same day. Ya'll keep in mind that the latest I will be reporting to Germany is March 10th 2009, hopefully it will be alot sooner.

TMC
09-09-2008, 06:00 PM
Here you go FIDO check this out

http://www.revperf.com/XB9-XB12/xbPerformKits.html

FIDOSOL
09-09-2008, 06:07 PM
The monster big bore kit (1474cc) is why I originally asked the question.:D

TMC
09-09-2008, 06:17 PM
do you have a 9 or 12?

FIDOSOL
09-09-2008, 07:00 PM
Unfortunately I have the 9 so the largest kit they have for me is 1170cc one.

TMC
09-09-2008, 07:14 PM
Trust me it will still be one heck of a ride

FIDOSOL
09-09-2008, 07:18 PM
I imagine so, all this depends on my wife learning to ride, I've mandated that she learn to ride if for no other reason than I think she needs to know how, hell everyone NEEDS TO KNOW HOW TO RIDE A MOTORCYCLE! That aside, if she enjoys riding she can have my bike, and I'm getting a new one. If she doesn't like riding, then I just have an excuse to have two bikes because she already said I could get a new one. [smirk]

bad juju
09-10-2008, 04:47 AM
my old buell instructer said you can put xb 9 pistons in the xb 12 motor higher compression!never seen it done.but i suppose the theory is sound!

RHYNOXB9R
09-10-2008, 05:00 AM
Hey FIDO,check out www.halspa.com they race the xb and have rippen big bore kits for them as well.

FIDOSOL
09-10-2008, 05:37 AM
Good link man. That is probably the best I can get without spending more than I have any right to.

dave_xb12r
09-10-2008, 05:40 AM
So Fido, what happened to buying a 12? Are you just gonna make your SX a 12 instead? I think you should get the CR. Has anyone on here bought a CR yet? You could be the first!! Hurry and buy it now!!

FIDOSOL
09-10-2008, 05:48 AM
LoL, I will have to wait on a new bike until I get to germany, now the issue I have is that I can ship my motorcycle with my household goods, but, it adds to my overall weight, and there is a limit to how much weight the gov't will ship for free, I'm not sure if I would be able to ship around 850lbs worth of motorcycles (and motorcycle gear) and all my other stuff without going over, still would have to be cheaper than shipping it seperate. Just another battle to win against the wife... I will have to ride the CR first and the 1125R and the Benelli 1130 Cafe Racer...

Someone on one of the posts said I shouldn't get two of the same bike, and my question is this...why not? If you have 1 dollar and you see another dollar, you want it right? :p

dave_xb12r
09-10-2008, 06:06 AM
That Benelli is pretty cool, but I think service and parts are going to be hard to come across. Stick with the buells! Why dont you try to restore a REAL cafe racer while you are over there? Something like a BSA or a Norton. Is the wife going with you to germany?

FIDOSOL
09-10-2008, 07:17 AM
Yes she is, I already hae a restoration project. 78' Chevy Cheyenne 4X4..

LeFox
09-10-2008, 11:05 AM
my old buell instructer said you can put xb 9 pistons in the xb 12 motor higher compression!never seen it done.but i suppose the theory is sound!
yea, that works, but the engine can't handle the compression without further mods...atleast not for too long.

FIDOSOL
09-10-2008, 11:08 AM
What other mods would it need?

LeFox
09-10-2008, 08:53 PM
other valves, springs, crank, ecm tuning, etc...

TMC
09-10-2008, 08:58 PM
He won't need a crank. unless he want's to lighten it or put some carillo rods on it. but yes you will have to put it on dyno and have it tuned or you'll burn it up in a flash

LeFox
09-10-2008, 09:11 PM
the original cranck will go crooked with that type of compression.

TMC
09-10-2008, 10:32 PM
nah not at 10:5:1 I've built a many of 88" motors with stock cranks. He should have any probs what so ever

LeFox
09-11-2008, 06:56 AM
ahm...you'll get about 12:1 when placing XB9 pistons in a XB12 :o

dave_xb12r
09-11-2008, 07:51 AM
wow.... thats crazy compression!

sinpieces
09-12-2008, 10:13 AM
I know a company who made a bigbore. They found crooked cranks in a 07 model which had been running all original and low miles. Lousy!
So, for bigbore you probably need fatter and/ or hardened cranks. Bigbore would be cool. Just wish i could afford ported heads, new cams and a remapp. That is the smarter move for longivity of engine.

Bill2
10-09-2008, 05:44 PM
A simple way to answer is a xb9 and xb12 both have 3&1/2 dia. pistons, the xb12 gets its larger displacement from longer rods. You could say its a factory stroker.

big b
10-09-2008, 05:58 PM
Rod length will not change displacement. Just bore and stroke.

Bill2
10-10-2008, 01:15 AM
Does'nt longer rods give you a longer stroke?

big b
10-10-2008, 02:07 AM
Stroke comes from the length of the crank throw. A longer rod will push the piston up into the bore further, but now it will not pull it down as far. Hope this helps I'm horrible at explaining things:)

bardo688
11-18-2009, 10:55 PM
wonder if a screaming would fit in a xb9s or would be a big waste of money trying to fit even if it did

expatriate00
07-14-2012, 10:22 AM
I've heard this arguement before and the conclusion was yes the length of the stoke does change the displacement. Not TOTAL displacement, but USABLE displacement. The XB9 and 12 share the same cylinder jugs, most engine manufaturers don't use the commonality of changing the stroke to create two engines. The longer stroke uses more of the bore to create 219cc more displacement than the 984. This expressed mathmatically as stroke, it's just a different way of expressing it.

So, the head work would need to consist of new valves and springs and having the head machined? Ported and polished. Any thing special?

Say you stuck an XB12 crank n rods in, retained the XB9 cylinders, and did the head work. Which would make more horses, The aforementioned engine or a bigbore kitted XB12? OR would the head work be virtually the the same and the real differnce would be in the big bore kit?

How much HP is an XB engine capable of making anyhow? 140?

Both will effect reliablity and engine life. WHat would would cryo-ing all the components do? Save expansion and contraction issues, I think they cryo the dry engine as a whole. Indy car and sports car racing teams cryo their race engines to make the metal harder and stronger. There are several places here in Indy that do this.

Draxsonimy
07-14-2012, 12:17 PM
Not trying to be a jerk but a 350 and 400 is NOT the same block.