Heavy duty timing chain

[Nessism]

Unless someone is running high lift cams and springs, there is no reason to worry about the cam chain. Get a stock replacement one piece cam chain if you are worried.

On my recent 1000S engine rebuild I measured the cam chain and could not measure any wear at all compared to the factory spec. Salty_Monk's GS1000 cam chain with about 80k miles likewise didn't show much wear. Suzuki used good parts on these engines because cam chain wear just isn't an issue.

[doctorgonzo]

I think the thinking Steve (this is my thinking) is "I've got 2 grand, 3 grand, 6 grand (name your level) in this motor", It's insurance, If you've got the motor torn apart anyway, and one is less than $70 (HD Chain), why not. Just for laughs on a stock motor, not needed.

I'm off to mock up a Bandit front end!

[Steve]

I think the thinking Steve (this is my thinking) is "I've got 2 grand, 3 grand, 6 grand (name your level) in this motor", It's insurance, ...

I guess I wasn't as clear as I could have been.

I wasn't tryng to imply that a NEW chain was not necessary, just that it didn't have to be HEAVY-DUTY.

.

[Don-lo]

What size spacer are you thinking of putting in there? I think your big problem will be needing a longer cam chain (and maybe longer studs).

There was an article in one of the mags about mixing and matching 86-90 GSXR750 cranks, rods, etc. to get a long-throw motor, and they needed a spacerplate/camchain for that (made by Falicon?). I think they claimed it was the highest horsepower 750 they ever dynoed. I can probably find the article (up in the attic).

Are you making your own plate? If it is made by someone, they can tell you what you need.

They used to make low compression pistons for turbo applications.

[chef1366]

Tsubaki

http://www.schnitzracingstore.com/catalogs/catalog.asp?prodid=5057334&showprevnext=1

[gsryder]

What size spacer are you thinking of putting in there? I think your big problem will be needing a longer cam chain (and maybe longer studs).

There was an article in one of the mags about mixing and matching 86-90 GSXR750 cranks, rods, etc. to get a long-throw motor, and they needed a spacerplate/camchain for that (made by Falicon?). I think they claimed it was the highest horsepower 750 they ever dynoed. I can probably find the article (up in the attic).

Are you making your own plate? If it is made by someone, they can tell you what you need.

They used to make low compression pistons for turbo applications.

I am not sure on the spacer size yet I dont need to lower the compression much. Stock they are 9.5:1. I think I want to get down just below 9:1, I will have to do some math and figure out what size base gasket I need to order from cometic. I could be wrong but I dont think the base gasket thickness will be substantial enough to effect the stock cam chain length.

I am still working out details and gathering parts. So far I have all the major components - Katana front end, GSRX rear swinger, 1100 engine, Turbo from a 1.8liter Audi A4, all going on to my 1981 gs750 frame this winter. I will starting a build thread once I actually start putting the wrench to her, for now I am still gathering parts and info.

[doctorgonzo]

Why do you want to drop the compression slightly, not saying anything is wrong with it, just asking.

[gsryder]

Why do you want to drop the compression slightly, not saying anything is wrong with it, just asking.

When you run a turbo you want to lower the compression depending on how much boost you plan on running. Lower compression helps prevent denotation once the the turbo starts to spool up.

[doctorgonzo]

When you run a turbo you want to lower the compression depending on how much boost you plan on running. Lower compression helps prevent denotation once the the turbo starts to spool up.

Oh yeah, forgot about the turbo. Have you been visiting oldskoolsuzuki.info? They have a whole forum devoted to nothing but forced induction.

[gsryder]

Been there quit a bit actually, but I like both sites allot of good info. on both.

[doctorgonzo]

Been there quit a bit actually, but I like both sites allot of good info. on both.

LOT more users here, and regulars, so much faster answers to questions, but less experience in radical mods.

[Steve]

So far I have all the major components - Katana front end, GSRX rear swinger, 1100 engine, Turbo from a 1.8liter Audi A4, ...

You going to change the turbine or compressor housings on the turbo? If not, you won't get much pressure.

The housings on the turbo are sized for that engine and its operating speed, basically meaning airflow. Your engine is only 60% of the size of the Audi, so you will have to run it over 1.5 times faster to get the same results. What's the redline on the Audi? What's the redline on the GS? Yeah, the GS redline might be about 1.5 times the Audi, but the airflow formulas are not linear, they are exponential, so you will likely see just a little boost near redline and not nearly enough below that to make it worth all the effort.

Maybe RapidRay or Blowerbike or one of the other racers/builders can give some specifics on what you might need, I only know the generalities based on trying to fit a wrong turbo on a car.

.

[gsryder]

You going to change the turbine or compressor housings on the turbo? If not, you won't get much pressure.

The housings on the turbo are sized for that engine and its operating speed, basically meaning airflow. Your engine is only 60% of the size of the Audi, so you will have to run it over 1.5 times faster to get the same results. What's the redline on the Audi? What's the redline on the GS? Yeah, the GS redline might be about 1.5 times the Audi, but the airflow formulas are not linear, they are exponential, so you will likely see just a little boost near redline and not nearly enough below that to make it worth all the effort.

Maybe RapidRay or Blowerbike or one of the other racers/builders can give some specifics on what you might need, I only know the generalities based on trying to fit a wrong turbo on a car.

.

What you are saying is correct. I wont get massive or crazy power out of that turbo, which I am going from memory I think is a K03. But it will serve it purpose for the time being 1. financially (it was free) and 2. dimensionally it is the same size as a K04 (which is what I would like to have).
So I am basically starting small and using this a learning curve with tuning, fitment, fuel, oil, etc. then I plan to swap out for a bigger turbo if necessary.
Even though the K03 is small I should be able to get around 180hp at the wheel and even if it is a little less or a little more I am basically just doing this for fun.

[gsryder]

Here are a few pics of the turbo





Came of a believe a 1994 Audi A4 1.8 liter. I know the guy whos car it was it was a low mileage nice car he drove into a ditch and bent the frame totaling it. So I was able to get the turbo for free.

[Grandpa]

Funny story for you Nick and everyone else: your old GK got it's motor torn apart a couple days ago actually. For those that don't know I bought grandpas GK with 130+k miles on it a couple of summers ago. I've since passed it on to my roommie as he gets more joy out of the big bagger than I did. Anyway at 140ish thousand miles now (yes I said 140THOUSAND miles) it finally devoloped enough of a base gasket leak to warrant a tear down and refurb. The head has never been off of this bike. Valves are still in spec and the funniest thing and my point for this story is that the stock cam chain is still in spec by over 50% of it's wear limit. At 140k miles this cam chain givin the current wear rate will last over 280 thousand miles before it would wear to replacement limit. These are tough engines boys. Overbuilt heavily. If you're not increasing HP I don't see a point in a heavy duty anything unless it's just as cheap as the OEM replacement (providing it needs replaced at all)

My goodness, Josh! Thank you for the update on "my" old GS1100GK, the best bike I've ever owned.

I guess it was a matter of time before it would start leaking from the base gasket. What, if anything, are you going to replace on the engine besides new gaskets, o-rings, etc.? Maybe new carb boots?

With the updated suspension, refreshed engine, and the new bearing on the driveshaft, it's a brand new bike!

Nick Diaz
Middletown, MD