Big engine in the U.K.

CBXs, new bikes, old bikes, cars, trucks, general chat, off topic, this is the place to post it.
Post Reply
steve murdoch icoa #5322
ICOA Member
ICOA Member
Posts: 4069
Joined: Tue Mar 04, 2003 9:12 am
Location: St. Catharines, On. Canada
Location: St. Catharines, On. Canada

Big engine in the U.K.

Post by steve murdoch icoa #5322 »

Looking for something else i came across this clip of a 1351cc engine build.
The owner is Steven Tatt. I think Mel knows him.
Wonder what the dyno says on this one?
http://www.youtube.com/watch?v=jNgpcDvL4sk

EMS
ICOA Member
ICOA Member
Posts: 10151
Joined: Wed Mar 05, 2003 7:55 am
Location: North East OH, ICOA 3904

Re: Big engine in the U.K.

Post by EMS »

It says 200hp on the rear wheel! Holy Mackerel....

User avatar
Syscrush
ICOA Member
ICOA Member
Posts: 1714
Joined: Fri Sep 14, 2012 2:29 pm
Location: Toronto, ON
Location: Toronto, ON

Re: Big engine in the U.K.

Post by Syscrush »

He's actually claiming 220 at the rear wheel.

Is that even possible on a naturally-aspirated bike?

That's significantly more power than a Hayabusa, with only a little bit more displacement. I have a very hard time believing that is doable with an old-tech air-cooled engine, regardless of how awesome it is by other metrics...
Phil in Toronto
A cool guy deserves a cool bike, a dork needs a cool bike...
Pics of Perry, my '79.

daves79x
ICOA Technical Director
ICOA Technical Director
Posts: 4738
Joined: Sun Oct 01, 2006 8:05 am
Location: Knox, PA
Location: Knox, PA

Re: Big engine in the U.K.

Post by daves79x »

I'm with you Phil, on that one.

Dave

User avatar
Syscrush
ICOA Member
ICOA Member
Posts: 1714
Joined: Fri Sep 14, 2012 2:29 pm
Location: Toronto, ON
Location: Toronto, ON

Re: Big engine in the U.K.

Post by Syscrush »

Maybe it's a typo? 120 at the wheel sounds more plausible.
Phil in Toronto
A cool guy deserves a cool bike, a dork needs a cool bike...
Pics of Perry, my '79.

steve murdoch icoa #5322
ICOA Member
ICOA Member
Posts: 4069
Joined: Tue Mar 04, 2003 9:12 am
Location: St. Catharines, On. Canada
Location: St. Catharines, On. Canada

Re: Big engine in the U.K.

Post by steve murdoch icoa #5322 »

Robinson Toolmakers with a claim of 165hp from one of their previous engines. 1425cc.
Something is not adding up. Nice sound though.
http://www.youtube.com/watch?v=_LV0rhXVk5g

User avatar
Syscrush
ICOA Member
ICOA Member
Posts: 1714
Joined: Fri Sep 14, 2012 2:29 pm
Location: Toronto, ON
Location: Toronto, ON

Re: Big engine in the U.K.

Post by Syscrush »

That sounds incredible.
Phil in Toronto
A cool guy deserves a cool bike, a dork needs a cool bike...
Pics of Perry, my '79.

steventatt
New Member & Happy To Be Here
New Member & Happy To Be Here
Posts: 20
Joined: Thu Feb 10, 2011 5:04 am
Location: Singleton, New South Wales, Australia
Location: Singleton, New South Wales, Australia

Re: Big engine in the U.K.

Post by steventatt »

i have had her on 2 different dynos one states 204.5 hp @9800rpm
the other states 140hp with 170 at the fly wheel. we run 73.5 ml pistons on std bore, 33mm round slide carbs, intake manifolds have enlarged to 33mm as well.
larger intake and exhaust valves polished and balanced crank forged aluminium rods hi lift cams ported head and other goodies
there are large differences between the two machines, so i think we might be some where in the middle
You do not have the required permissions to view the files attached to this post.

EMS
ICOA Member
ICOA Member
Posts: 10151
Joined: Wed Mar 05, 2003 7:55 am
Location: North East OH, ICOA 3904

Re: Big engine in the U.K.

Post by EMS »

Can you enlighten me, what a 73.5 mL (usually stands for milliliter: a unit of capacity equal to one thousandth of a liter, and equivalent to 0.033815 fluid ounce, or 0.061025 cubic inch. Abbreviation: ml. ) piston is?
Just in case, you meant "mm" (usually stands for millimeter: a unit of length equal to one thousandth of a meter and equivalent to 0.03937 inch. Abbreviation: mm.), how does that fit your remark that you are running a "std bore"?
BTW: All the dyno-sheets that I had done, show the make and model of the bike somewhere. I can have my K1600GT run on a dyno and tell everybody it is the sheet for my GB500. :think:

steventatt
New Member & Happy To Be Here
New Member & Happy To Be Here
Posts: 20
Joined: Thu Feb 10, 2011 5:04 am
Location: Singleton, New South Wales, Australia
Location: Singleton, New South Wales, Australia

Re: Big engine in the U.K.

Post by steventatt »

correction.
sorry you are correct.
i did mean to say 73.5mm pistons on a std stroke of 53.4 witch gives us 1359cc
my name, engine size and bike is on the dyno sheet.
regards steve

steve murdoch icoa #5322
ICOA Member
ICOA Member
Posts: 4069
Joined: Tue Mar 04, 2003 9:12 am
Location: St. Catharines, On. Canada
Location: St. Catharines, On. Canada

Re: Big engine in the U.K.

Post by steve murdoch icoa #5322 »

Steven, i know how much fun i have with the 89hp my '81 puts out so the 140hp must be a blast to play with.

steventatt
New Member & Happy To Be Here
New Member & Happy To Be Here
Posts: 20
Joined: Thu Feb 10, 2011 5:04 am
Location: Singleton, New South Wales, Australia
Location: Singleton, New South Wales, Australia

Re: Big engine in the U.K.

Post by steventatt »

thanks steve,
i think any cbx is fun to ride...... a few more horses does make it interesting.
thanks again
regards steve

daves79x
ICOA Technical Director
ICOA Technical Director
Posts: 4738
Joined: Sun Oct 01, 2006 8:05 am
Location: Knox, PA
Location: Knox, PA

Re: Big engine in the U.K.

Post by daves79x »

Steve: Some of us here are not meaning to bust your chops on this thing, but Mike and others know what I know - it takes a Herculean effort to get a true 120 rwhp out of a carbureted CBX. There are a scant few in the world producing that, and staying together for long enough to ride. To get the numbers you are talking, is beyond our comprehension, even given the work you've laid out. I would love to see, say a Hyabusa or a ZX12, that we all know the hp of, run back-to-back on your dyno with your CBX. That would tell us all for sure what we are looking at. An air-cooled bike making upwards of 200 hp just seems so incredulous to many of us. Whatever it is, though, we applaud your effort.


Dave

EMS
ICOA Member
ICOA Member
Posts: 10151
Joined: Wed Mar 05, 2003 7:55 am
Location: North East OH, ICOA 3904

Re: Big engine in the U.K.

Post by EMS »

We have beaten that dead horse in the below thread and most of my questions I have asked there, remained unanswered.
What bothers me the most is the quality of posts about subjects like this.
With so many people on this forum who have worked on CBXes until their fingers bled, I think we owe it to them to make statements that are correct in the details and make sense for everybody when they read them.

viewtopic.php?f=102&t=9038

User avatar
wyly
ICOA Member
ICOA Member
Posts: 1727
Joined: Tue Oct 30, 2007 4:20 pm
Location: calgary alberta canada
Location: Calgary Canada

Re: Big engine in the U.K.

Post by wyly »

after my engine rebuild a tech estimated my now 1150 Z hp at 110ish I assume that's at the crank but it doesn't much matter to me, whatever it is it's more than enough to get me into a lot of trouble with the law...so much fun :D
CBX a work in progress, still improving...GS1150EFE completed and awaiting modifications.....RD350, remnants in boxes scattered throughout the garage

Post Reply

Return to “Daily Discussion: By, For & About CBXers”