Topic: Building a QUICK Honda SOHC for Street.

[Dave-and-his-550]

Let's see...  A rider with a stock CB750 carrying around an extra 50 pounds in his beer gut and man-boobs could either stop eating so many burgers and stop drinking so much beer and drop that weight, or add an extra 3hp to his machine. 



Increasing hp is starting to sound a lot more attractive!

Quite the sense of humor. I lol'd

[fastbroshi]

polish your bike frequently... every granule of weight counts and clean bikes look faster.

  We are talking about Hondas, here.  You could always slap a "Type R" sticker or VTEC badge on there, that's gotta be worth about 3hp, or a sixer of Bud Light. 
  I'm in agreement about the addressing handling/braking before power.  Ever look at the specs of a Lotus Elise?  That thing basically has the same motor as the late Corolla XR-S, but it handles like a go-cart = sinful fun.  And they released the s/c version after that, which only added about 40-50 hp, but that car weighs like 2000 lbs.  So you can imagine how it scoots.

[MRieck]

 A 95HP CB750 is really fun to ride.

[bwaller]

95 bloody horsepower......

[MRieck]

95 bloody horsepower......

Well stated bw.

[Terry in Australia]

As much as I love my CB750's, there is just no way a good rider on a CB750 will take a good rider on say, a Suzuki GSXR750, unless he shoots him first.

Nothing wrong with our old bikes, but sadly, they ARE old bikes and old tech as well. Why does anyone care about bull#$%*ting about taking modern bikes anyway?

Most modern 750's are making in excess of 120 BHP and are lighter, handle better and are incredible brakers. It's not just plastic men, it's the 21st century!

[bwaller]

Agreed Terry!

[MRieck]

As much as I love my CB750's, there is just no way a good rider on a CB750 will take a good rider on say, a Suzuki GSXR750, unless he shoots him first.

Nothing wrong with our old bikes, but sadly, they ARE old bikes and old tech as well. Why does anyone care about bull#$%*ting about taking modern bikes anyway?

Most modern 750's are making in excess of 120 BHP and are lighter, handle better and are incredible brakers. It's not just plastic men, it's the 21st century!

I think I've said the same thing one or 2 times.  ;DIt's easy to knock modern bikes if you have never ridden one.

[MCRider]

polish your bike frequently... every granule of weight counts and clean bikes look faster.

  We are talking about Hondas, here.  You could always slap a "Type R" sticker or VTEC badge on there, that's gotta be worth about 3hp, or a sixer of Bud Light. 
  I'm in agreement about the addressing handling/braking before power.  Ever look at the specs of a Lotus Elise?  That thing basically has the same motor as the late Corolla XR-S, but it handles like a go-cart = sinful fun.  And they released the s/c version after that, which only added about 40-50 hp, but that car weighs like 2000 lbs.  So you can imagine how it scoots.

I've always found that well placed decals are good for extra horsepower. 

[MJL]

IF you were to build a  QUICK MOTOR TODAY, WHAT would you use?

 I ask because knowing how quick they used to be there must surely be room for improvement. I mean the 70,s were not the zenith of engine development, I am sure there is improvements in a few areas..

Porting,I hope in 30 years, there has been a bit of increase in flow. I see smaller stems, which should help.

Cam designs

Exhaust

Induction, I am sure over 30 yrs carbs may have improved or injection could be fitted, ditto for ignition

Tires, pretty sure they got better
Chassis and clutches.. got be a gain there somewhere

Bottom line, it should be easier now to go quick than it ever was..

I like my old Honda, but I can't stop thinking about wheelie power.  The other day I was thinking that there must be more in my motor, I just don't want to fiddle with changing carb jets and such to find it, so I did some other things. I adjusted the cam chain, reset the timing (3 and 4 were way off) and set the air screws to 1 turn out.  Then I went for a ride.  It feels faster and pulls harder than it did before, and with a bit of clutch abuse I was able to lift the front tire.

I said all that to say this.

In the last few weeks I have been thinking and dreaming of an 836.  I have been weighing the cost of that and the cost of rebuilding my worn out rock hard suspension against a new bike.  (CBR vs. Buell vs. rebuilt CB750)   After going out last night and hitting 70+ on the highway on ramp I think that I'll just put a cam in it along with a fuel injection setup and call it done.

[KingCustomCycles.com]

I like them loud so they sound faster 

[voxonda]

polish your bike frequently... every granule of weight counts and clean bikes look faster.

  We are talking about Hondas, here.  You could always slap a "Type R" sticker or VTEC badge on there, that's gotta be worth about 3hp, or a sixer of Bud Light. 
  I'm in agreement about the addressing handling/braking before power.  Ever look at the specs of a Lotus Elise?  That thing basically has the same motor as the late Corolla XR-S, but it handles like a go-cart = sinful fun.  And they released the s/c version after that, which only added about 40-50 hp, but that car weighs like 2000 lbs.  So you can imagine how it scoots.

I've always found that well placed decals are good for extra horsepower. 

Yeah agree, a well placed "Yoshimura" sticker will definitely give some advantage.

[754]

Terry,

there are no rules..

 SO..
we CAN use blowers or turbos, so we should be able to make that HP the new 750,s do.


BTW I spent a bit of time in the pits at the drags Friday nite.

A ZX 14 rider I talked to said the 2 Busa's beside us will run a mid ten, as would he.. and they did..

I know it is a high track, and the ZX rider was a big guy.. but mag times and on the asphalt times usually have a spread..

So are the 120 hp new 750s, dynoed at the crank, or the rear wheel ?

[eldar]

Well it is not just about the power. You gotta get it to the ground. Without some good mods to the swingarm, you can only get so much rubber on the road. All that power is worth nothing with no stick.

There is also the added weight. If you stack on a turbo or FI, you will most likely increase the weight over the stock and even if you do drop weight, without major mods, the cb will still likely weight more.
Not saying the cb will always lose in the 1/4th but the rider will have to be tops to beat a good rider on cbr. Conrners? forget about it, unless the cb rider is very good and cbr rider is so-so.

But what do you expect from 30 years of advancement. If I want cbr performance, I will get a cbr.

[754]

Yup, There is a good reason for me having a 6 over swingarm and the frame lowered about 4 inches, my forks are about 1.5 inch under and the bike ishigh up front(not level). I have run them lower like about 3 under at the track.

The other plus is, it is harder to get a ticket. You can launch as hard as you want most of the time, the sportbike beside you getting the wheel up will get the ticket before you will.

[sparty]

Terry,

there are no rules..

 SO..
we CAN use blowers or turbos, so we should be able to make that HP the new 750,s do.


BTW I spent a bit of time in the pits at the drags Friday nite.

A ZX 14 rider I talked to said the 2 Busa's beside us will run a mid ten, as would he.. and they did..

I know it is a high track, and the ZX rider was a big guy.. but mag times and on the asphalt times usually have a spread..

So are the 120 hp new 750s, dynoed at the crank, or the rear wheel ?

754,

My GSXR 750 made 135 RWHP with an after market can on it.  I sold it like a dummy.
135 RWHP may not seem like a whole lot, but in a bike that was 400 lbs. it was way too much power for many riders.  It ate through rear tires like mad, and they are not inexpensive!  Insurance was also expensive, and so were the tickets.

Sparty

[heffay]

Terry,

there are no rules..

 SO..
we CAN use blowers or turbos, so we should be able to make that HP the new 750,s do.


BTW I spent a bit of time in the pits at the drags Friday nite.

A ZX 14 rider I talked to said the 2 Busa's beside us will run a mid ten, as would he.. and they did..

I know it is a high track, and the ZX rider was a big guy.. but mag times and on the asphalt times usually have a spread..

So are the 120 hp new 750s, dynoed at the crank, or the rear wheel ?

754,

My GSXR 750 made 135 RWHP with an after market can on it.  I sold it like a dummy.
135 RWHP may not seem like a whole lot, but in a bike that was 400 lbs. it was way too much power for many riders.  It ate through rear tires like mad, and they are not inexpensive!  Insurance was also expensive, and so were the tickets.

Sparty

that's what made me sell my 94 cbr f2... in 2 years time i would've paid the $3000 purchase price all over again in insurance!     that was in 1997 when i was 21... now that i'm in my 30s... have no tickets on record (a major accomplishment considering i had 2 for 100+ mph over the limit )... my insurance is much lower and the break from rockets up until a couple of years ago may have just saved my life.   

[MJL]

Terry,

there are no rules..

 SO..
we CAN use blowers or turbos, so we should be able to make that HP the new 750,s do.

On youtube there used to be a video of a guy and his supercharged Honda. I thought it was a 750, but I can't find the video anymore.

[sparty]

Terry,

there are no rules..

 SO..
we CAN use blowers or turbos, so we should be able to make that HP the new 750,s do.


BTW I spent a bit of time in the pits at the drags Friday nite.

A ZX 14 rider I talked to said the 2 Busa's beside us will run a mid ten, as would he.. and they did..

I know it is a high track, and the ZX rider was a big guy.. but mag times and on the asphalt times usually have a spread..

So are the 120 hp new 750s, dynoed at the crank, or the rear wheel ?

754,

My GSXR 750 made 135 RWHP with an after market can on it.  I sold it like a dummy.
135 RWHP may not seem like a whole lot, but in a bike that was 400 lbs. it was way too much power for many riders.  It ate through rear tires like mad, and they are not inexpensive!  Insurance was also expensive, and so were the tickets.

Sparty

that's what made me sell my 94 cbr f2... in 2 years time i would've paid the $3000 purchase price all over again in insurance!     that was in 1997 when i was 21... now that i'm in my 30s... have no tickets on record (a major accomplishment considering i had 2 for 100+ mph over the limit )... my insurance is much lower and the break from rockets up until a couple of years ago may have just saved my life.   

yeah Hef,

My car insurance was $730 a year, but the bike was insurance was $1100! and my riding season was about 8 months.  So, when I was writing a insurance check for the bike and it was covered in the garage, it was a bitter pill.  The nice thing about selling that bike was that I sold it for only $400 dollars less than I paid for it (however, it had new tires which were big $$$).  Stupid squid bought it and totaled it within a month.

[Terry in Australia]

G'Day Frank, that was rear wheel horsepower mate. Those "busa's must have been stockers though, my old GS1000 based drag bike would pull 9's all day, and when I pulled the engine out and stuck it in a road bike, it'd still do 10's, and was reliable.

Talking about reliable, sticking blowers, turbo's, monster cams and 1000CC plus kits to CB750's will make them as fast (theoritically) as a modern "off the showroom floor" GSXR, CBR etc, and they sure do look cool, but that's where it ends mate, if you want to go really fast, I'm talking "poo your pants fast" then commute to work, go around corners, do some touring, etc etc, buy a modern bike.

My bog-standard BMW K1100LT has about twice the RW BHP of a CB750, handles better and has phenominal Brembo brakes, will do 140 MPH all day while I listen to my favourite Mantovani concerto, and returns a minimum of 50 MPG. It's a typical modern touring bike, boringly reliable, and with just under 100,000 miles on the engine, has never been apart, and probably won't need to be, in my lifetime.

Don't get me wrong, I love cutting up quite country roads on my K1 "Power Kruiser" while listening to the 836cc race engine's mechanical symphony, but nowadays, it's only "fast" when compared to other bikes of the era. My stock Suzuki GS1000S will eat it for breakfast, and it's 27 years old this year, and just about anything over 500cc's built in the last 10 years will crap on it. No biggie, I love it, but I don't bullshiit about it either...............