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How to let GS to have higher rpm?

  • Thread starter Thread starter Addy Leung
  • Start date Start date
The big question is

How much do you want to spend?

You can still get all the speed parts you'll ever need for that motor, but do you want to spend $3-5k to get it done?

Just saw a GS Superbike at Daytona. I think it was redlined at 11,000, not that much higher revs, but a lot more power
 
One other trick to a lighter valve train is center boring the cams. This was another trick used by old GS superbike racers.
 
Does a MSD MC-4 programmable ignition system would be helpful to shift the ignition timing few degrees advance at high rpm range ( let say 5 degree advance between 8000 rpm to 11,000rpm)?
( Actually, I think it is by rotating the ignition pick up coils plat 5 degree advance and then using the MC-4 to set the ignition timing 5 degree retard between 0rpm to 7999rpm, so that it will have 5 degree advance between 8000 rpm to 11,000rpm)
 
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While you can certainly get your engine to make as much power as an R1, you will never get it to be as light. A race stock R1 weighs what... 340lbs? If you are one of the lucky ones, your GS might weigh 500 lbs bone dry. A big piston kit, race cams, some smoothbores and velocity stacks, a 4-1 pipe, Dyno tuned, easy to get 170 hp on a GS. But you'll never have the suspention to hold it up, the brakes to stop it, and a rigid, lightweight chassis to keep it tracking well. And let's not even talk about cooling the thing on the street.

Basically you can spend $8-12k building a 170hp GS with modern rubber and hardware, and still the R1 with a good rider will walk away from you on the twisties.

If you want an R1, buy an R1.
 
Sorry for me giving a wrong impression to you that I am making a R1 by a GS foundation.
it may just want to explore some technology from modern sport bike and see anything learned to apply to the GS.
It is just like an everyday hobby. Sometime life is boring and having some extra leisure time.
Improving a GS step by step is a long time work and sure it is very interesting hobby to me. Every time adding something new to it and try it, it will give something extra and a silence answer to let me explore it, no matter it is a good result or getting worse but sure it is worth and interesting.
(I know I am look like a mechanic more than a bike rider)
 
Addy Leung said:
Sorry for me giving a wrong impression to you that I am making a R1 by a GS foundation.
it may just want to explore some technology from modern sport bike and see anything learned to apply to the GS.
It is just like an everyday hobby. Sometime life is boring and having some extra leisure time.
Improving a GS step by step is a long time work and sure it is very interesting hobby to me. Every time adding something new to it and try it, it will give something extra and a silence answer to let me explore it, no matter it is a good result or getting worse but sure it is worth and interesting.
(I know I am look like a mechanic more than a bike rider)
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Some people, including my wife, think I'm nuts for continually trying to make my bike work better. Anyone can go buy a cookie cutter bike. Making an old bike your own is much more satisfying.
 
The cylinder head is the limiting factor. It simply doesn't move enough air for a motor that size, so it has to make it's power at lower RPM.

Years ago we did some pro stock type heads that were 33/29 valves, huge ports, raised clear up into the camshaft area. These motors had to turn over 12,000 to make their max power.

Then Suzuki came out with the Hayabusa, and you could get the same head from your Suzuki dealer.

Jay
 
Just remove the tach and use a shift light with a 10K chip, then install a 14T upfront and a 46T rear and hang on \\:D/ With a 25-26 inch tall tire it should topout in 5th gear between 133-138mph, if it can get to 11K in 5th then that's 150mph. Remember half the fun is getting there and the other half is the taxi ride home from the police station 8O
 
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Not to beat the dead horse, but higher RPMs for more power actually means less powerband.

I have an 01 r1, with the 74x58mm bore x stroke. Stock crank horsepower peak is claimed at 150hp.

In 04 they made a much higher revving r1, with a 77x53.6mm bore x stroke. Claimed 180hp.

Can you guess which bike has more midrange stomp?


hint, its not the short stroke screamer


But back to the question at hand, you want a higher top speed, you're still in trouble. Its called aerodynamics... or in the case of the typical GSX, total lack thereof :D
 
Interesting read, I'm at least the 3rd owner on my bike and it doesn't hit the powerband till almost 8000rpms and then it's HOLDON for a whole 1k and I have to back down. I did notice that the heads are of a different design than what my Clymer book says they should look like. Instead of having boots that bolt up to the head it has tubes cast directly in the heads and then it is just some rubber tube that is clamped to that and my vm33s, any ideas?
 
thr3shold said:
Interesting read, I'm at least the 3rd owner on my bike and it doesn't hit the powerband till almost 8000rpms and then it's HOLDON for a whole 1k and I have to back down. I did notice that the heads are of a different design than what my Clymer book says they should look like. Instead of having boots that bolt up to the head it has tubes cast directly in the heads and then it is just some rubber tube that is clamped to that and my vm33s, any ideas?
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What Bike?? sounds like a 78 or 79 GS1000 or 850, it may have the later 80 on model head on it.
Dink
 
Ooops, I've got a '80 1100E. I'm waiting for my Tracy fairing to come in the mail :-D \\:D/ \\:D/ \\:D/
 
Revs

Revs

Ive seen 11,500 rpm on my tacho but that was after a mate asked me what it revs to on a rolling burnout. Now i just let it grunt and play with the throttle which is more stylish. And no it isnt a crap tacho thanks very much LOL
 
I'd admit to pegging the tach on my 550 a couple times. With no ill effects. :-) I just wouldn't want to run the motor there all the time. The bottom ends can handle it. The top ends are the problem.
 
weight reduction and "old tech" is not the major concern here really. You could build a gs engine to go to 12000 rpm, however you would need a larger camshaft and a VERY well ported head along with new carbs and exhaust just to get adequate (not great, but adequate) airflow. Then comes valvetrain stability- very high spring pressures which will wear fast, but are required to avoid valve float. Next comes the crank- it would be easiest just to build a billet crank and go from there (welding and cutting etc. could work, but would not be the safest routine). The pistons from Wiesco could hold up to it, but the connecting rods would need new bolts, and shotpeened at the least- again billet rods would be safer. The ignition MAY actually hold up to it, but would not be optimal. This crap about "30 year old tech" is just that- crap. Hell a gen 1 chevy 350 has WAY older "tech" than that and yet you can take stock parts on one of those to 7500 rpm (normal facory redline is about 5,000).

Its not impossible, its not even all that hard, its just expensive and not practical for the street (which is where most of us drive our bikes).
 
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