Engine differences: 1980 - 1983 GS1100E

[quexpress]

Hi!

For the GS1100E,
At http://www.suzukicycles.org/GS-series/GS1100E.shtml it is indicated:



Power in 1980 was 86.67@8000rpm, with torque of 59.73@6500rpm. wet weight was 563.5lbs. ”



Power in 1982 was 108bhp@8500rpm, with torque of 67.6@6500. Wet weight was 549lb's. ”

What were the main enhancements used to produce such a difference of bhp and torque?

Thanks!

[TheCafeKid]

Hi!

For the GS1100E,
At http://www.suzukicycles.org/GS-series/GS1100E.shtml it is indicated:



Power in 1980 was 86.67@8000rpm, with torque of 59.73@6500rpm. wet weight was 563.5lbs. ”



Power in 1982 was 108bhp@8500rpm, with torque of 67.6@6500. Wet weight was 549lb's. ”

What were the main enhancements used to produce such a difference of bhp and torque?

Thanks!

There have been two or three threads on this exact subject in the last couple of weeks. A search would have likely produced your answers. But, in a nutshell, its all in cam timing.

[rphillips]

Where did those numbers come from, The #'s for that "80" model looks closer to the GS750 than the GS1100. There were small differences from "80" to "83", but nothing like 20hp

[emjay]

It's cause the engine is black.

[jwhelan65]

That 81 1100 is one of my faves,

[TheCafeKid]

Where did those numbers come from, The #'s for that "80" model looks closer to the GS750 than the GS1100. There were small differences from "80" to "83", but nothing like 20hp

Yeah that looks like either a misprint or the wrong bike's specs... 10HP is roughly what it ended up being, with the 83 1100s having a little bit more even still (82 1100E at 108HP, 831100E/ES with 111BHP) but again, thats all in cam timing... the 83 1100 had the hottest cams of the line, with a 293 grind i think it was. The 1150 has hotter still with i think a 330... 1150 cams are going in my ES this winter, degreed, should prove a pretty potent without compromising durability...

One other thing I wanted to add... Ive ridden both models, and to be honest, the early 1100s feel a bit punchier in the low end.. Totally in gearing perhaps, or again, cams. The later models have an INSANE top end rush that come on around 7k. Its like a retro rocket got lit under you, feels like a different bike altogether when you really get into it. But, for the classic UJM feel, and around town, everyday riding comfort, you cant go wrong with the 80-81 models. Really, you cant go wrong with EITHER model, but the 82-83 has a distinctly more "sporty" riding position that isnt quite as comfortable just putting around IMO...

[quexpress]

One other thing I wanted to add... Ive ridden both models, and to be honest, the early 1100s feel a bit punchier in the low end.. Totally in gearing perhaps, or again, cams. The later models have an INSANE top end rush that come on around 7k. Its like a retro rocket got lit under you, feels like a different bike altogether when you really get into it. But, for the classic UJM feel, and around town, everyday riding comfort, you cant go wrong with the 80-81 models. Really, you cant go wrong with EITHER model, but the 82-83 has a distinctly more "sporty" riding position that isnt quite as comfortable just putting around IMO...

That's the info I was looking for. I already have a 1980 GS1100E (called GSX1100ET in Europe) which is the platform my next project. If the engine is as good (or very similar) to an 83 at low end, I'll forget about that engine swap.
Thank you!

[mriddle]

For longevity, the 83 may be the better choice if you have two to choose from..

Both are very strong engines and make the bikes a joy to ride.

[woodman]

Cafe Kid, you do realise that you'll lose your mechanical tach with 1150 cams dont you ?

[TheCafeKid]

Cafe Kid, you do realise that you'll lose your mechanical tach with 1150 cams dont you ?

The 1100ES uses an electronic tach, so no, i wont lose my mechanical tach, as i never had one

[TheCafeKid]

That's the info I was looking for. I already have a 1980 GS1100E (called GSX1100ET in Europe) which is the platform my next project. If the engine is as good (or very similar) to an 83 at low end, I'll forget about that engine swap.
Thank you!

Oh...one other thing that hasnt been mentioned, but unless you're planning some ungodly bore kit, or drag racing, I wouldnt put much stock in worrying about it:

The 80-mid 82 1100 motors didnt have a welded crank. In late 82 apparently, Suzuki saw fit to weld the cranks at the press pins. Some guys have had problems with crank twisting, but it seems to happen early on, or under heavy abuse... I wouldnt worry about it. Otherwise, they are just as durable as any of the other roller bearing motors..

[quexpress]

Oh...one other thing that hasnt been mentioned, but unless you're planning some ungodly bore kit, or drag racing, I wouldnt put much stock in worrying about it:

No that will not be the case.

The 80-mid 82 1100 motors didnt have a welded crank. In late 82 apparently, Suzuki saw fit to weld the cranks at the press pins. Some guys have had problems with crank twisting, but it seems to happen early on, or under heavy abuse... I wouldnt worry about it. Otherwise, they are just as durable as any of the other roller bearing motors..

Do these 16 valve 1100 engines share the same crank as 8 valve 1100 engines (i.e.: 1983 GS1100GK)?
Thanks!

[headsbikesmopars]

Another thing that hasn't been mentioned is that Suzuki changed the seat angles on the head for the '81 and later models. If you will remember ,..the '80 GS1100 went 11.49 @ 116 mph. Still the best of the rest at the time. The '81 model clocked 11.18 @ 120. slightly Better numbers than the '82 model. While the '83 model went 10.99 @ 122mph. Both the '80 and '81 models were rated at the same 105 hp but obviously the '81 had more hp. I believe the '82 was rated @ 108 and the '83 rated @ 111, same as the Katana. It sounds to me like the 86 hp number was taken @ the rear wheel. There was an airbox change with the '82 model. Jeff was right, the '83 had the best cams of the 1100 series. 7.5 mm ( .296) lift. And 280 degrees both sides. While the '80-'82 years had 7.0 mm (.276) lift on intake with 280 degrees and 6.5 mm (.256) lift with 268 degrees on exhaust. If you have an '80 model just have a good radius valve job performed and you are very good to go. You can't really go wrong with any model year. JMHO.

Terry

[TheCafeKid]

No that will not be the case.

Do these 16 valve 1100 engines share the same crank as 8 valve 1100 engines (i.e.: 1983 GS1100GK)?
Thanks!

Its not the SAME crank, no, but it IS a roller bearing crank, like the 8v 1100 (and 550, 77-79 750, 850, and 1000.....) Durable, tough, heavy (which help with the grunt) bulletproof, so long as you dont overpower it. The drag guys will tell ya too. Yes, it would be nice to have a welded crank for piece of mind..but if you're just riding it as it was meant to be ridden to begin with, which is pretty aggressive for MOST people, then you'll have no problem.

By the way Terry.... Its JOSH, not Jeff...LOL

[elevatorman71]

hey josh i just picked up an 82 1100 is the hp the same as you were stating before 110? or what is it? i know the carbs are bigger but what am i looking at for hp? torque?