GS Big Block

[blowerbike]

the more HP you make the more heat you make.
you can't have a cross country bike and a 180 HP hot rod at the same time.
not with old technology anyways.
with water cooled/injected bikes yes..with old school air cooled...nope.

[rapidray]

Also, I won't go bigger than 1327 on a stock block due to cylinder distortion. Ray.

[rapidray]

the more HP you make the more heat you make.
you can't have a cross country bike and a 180 HP hot rod at the same time.
not with old technology anyways.
with water cooled/injected bikes yes..with old school air cooled...nope.

Want to bet?!! Ive DONE it! I had a 1400 daily driver in HAWAII, in traffic EVERY day, 182 @ the rear wheel at 9200 rpm & not 1 problem in 2 years. Ray.

[mr wu]

Ok...My plan was to start collecting for my winter project...
Was or planned to go BB 1500 ?? And adding FI ...With the purpose of going turbo or super charged down the road...

[mr wu]

Ok...I didn't mean to hijack the thread....
Got carried away...

[blowerbike]

Want to bet?!! Ive DONE it! I had a 1400 daily driver in HAWAII, in traffic EVERY day, 182 @ the rear wheel at 9200 rpm & not 1 problem in 2 years. Ray.

what YOU do and how YOU operate the bike is 2 different things.
you know what happens when you do work for people.
they have you do the work because they have no idea of the workings of a high performance engine.
they will sit and idle in traffic or drink 3 cups of coffee with the choke on while the engine melts in the driveway.
been there......done that with customers.
this is why i hate silly questions...plus the cost of what your speaking will more than pay for a nice used hayabusa.
i get it but most people don't.

[blowerbike]

and mr. wu...
a 1200cc turbo engine will more then get the job done.
turbo's don't need to be bigcc's...just big enough.

[mr wu]

and mr. wu...
a 1200cc turbo engine will more then get the job done.
turbo's don't need to be bigcc's...just big enough.

I figured as much....Gluttony on my end...ugh

Also really not interested in a Busa....I strive to be different

[Big Jay]

Once you get over 1260 / 1327cc you would need a cylinder head that cost more than the rest of the motorcycle, just to feed it.

The bigger motors require heads that have relocated and/or canted intake valves to try and get 33 mm valves in it. That is very high maintaince stuff.

I was glad when the busa came out so we didn't have to build that kind of stuff anymore.

Now it is just 1260/1327 with 29.5/24 heads for street bikes.

[yoshisakan]

If I wanted a hayabusa, i'd go buy a damn hayabusa. I have owned 3 GS's. I like these bikes. I want to build one to be as fast as would be safely streetable and not cost a fortune. Thanks for all the advice here. Ray, i'll give you a call tomorrow. My name is John.

[ozman]

If I wanted a hayabusa, i'd go buy a damn hayabusa. I have owned 3 GS's. I like these bikes. I want to build one to be as fast as would be safely streetable and not cost a fortune. Thanks for all the advice here. Ray, i'll give you a call tomorrow. My name is John.

somewhat of a contradiction is wanting to go big block, bulk horsepower and not wanting to spend a fortune
why not sleeve it out to near 1300cc and not have as many drama's with overheating
it will still be not be cheap to build a complete package properly so its reliable
sleeved or big block means cases bored crank welded straight cut gears on primary hd clutch bigger carbs bigger cams etc etc

ozman

[blowerbike]

a fortune it will be...
to be continued

oh,
and the hayabusa part of my comment is pointed towards the cost of a decent GS build.

[rapidray]

Once you get over 1260 / 1327cc you would need a cylinder head that cost more than the rest of the motorcycle, just to feed it.

The bigger motors require heads that have relocated and/or canted intake valves to try and get 33 mm valves in it. That is very high maintaince stuff.

I was glad when the busa came out so we didn't have to build that kind of stuff anymore.

Now it is just 1260/1327 with 29.5/24 heads for street bikes.

A 31/27 head will support over 250 HP on a 1500 cc motor so I disagree with the "unobtanium" headwork for big motors. Yes, Busa heads are a better platform for headwork but the GS heads are what we have been dealt & I do the best I can with the hand I have been dealt. Big GS street motors are a BLAST due to their torque advantage more than just about anything else. Hell, you want some REAL fun, a 1400cc GS, with STOCK head & cams, with correctly jetted 1150 carbs will smoke the back tire in 2nd gear roll ons!!! The torque from a motor like that WILL yank your arms straight! Until you have ridden a bike with a motor like that you just have NO idea! Ray.

[Nessism]

Just my opinion, but it strikes me as risky to dump big money into a high HP air cooled engine. Get stuck in traffic, pick up some crud in your jets, get an air leak in the carbs, etc, and the engine will cook from all the heat. There's a reason modern high performance bikes are water cooled.

[stetracer]

I have to agree with Ray on this one I have had a 1327cc big block on the street here in Florida heat with no problems. It all depends on how you set it up. And I agree with Jay on the fact that a Nicely ported head is needed to bring out the full potential of the big block. I don't believe you néed to go with a big block to get the 180hp your looking for a Nicely ported 29.5/25 GS1150 head on a 1260cc motor will get you the HP your looking for. A 1425cc GS motor with a GS1150 Nicely ported head 29.5/24 valves will get over 200 HP on a street motor and over 220hp with higher compression. But anyway you do it it won't be cheep. Your looking at 2 grand just in the head if not more. Just the parts are going to be in the 4 grand range not counting any labor so be ready for the big bill but you will have something not many have and will surprise the crap out of most Busa's. on more thing if you don't do any chassis work all that HP will be wasted on wheel spin. Most of your power is made in the head so without some good head work you will be wasting a lot of piston displacement. You will get more power from a small cc motor with a Nicely ported head than a big motor with a stock head.