Bandit Alley

MODEL SPECIFIC => SUZUKI BANDIT 600 thru 1200 - AIR/OIL COOLED TECHNICAL => Topic started by: H2RICK on April 03, 2009, 08:58:20 PM

Title: Why Would The Earlier 1100 SACS Engine....
Post by: H2RICK on April 03, 2009, 08:58:20 PM

have different valve clearances than the 1200 Bandit engine ???

I have the FSM's for both the GSX1100F (1988-94) and my 3G 1200.
The earlier manual shows 0.10 - 0.15mm for BOTH intake and exhaust...
but....
The 3G manual shows: Intake 0.10 - 0.15 mm Exhaust 0.18 - 0.23mm

Any insights out there from anyone ?? I would have thought that they'd be identical all the way through to the end but.....
apparently not.

Title: Re: Why Would The Earlier 1100 SACS Engine....
Post by: pmackie on April 03, 2009, 09:57:36 PM

Hey Rick

I would have thought they would have been the same as well, so I can only speculate. Maybe:
- they found over time that the exhaust needed more clearance?
- newer exhaust valves are slightly different material, with different expansion characteristics?

It would be nice to know why.

Title: Re: Why Would The Earlier 1100 SACS Engine....
Post by: H2RICK on April 03, 2009, 10:46:05 PM

I'd put my money on your second idea, Paul, but.....let's hear some more info on this weighty question. Inquiring minds want to know!! :grin:

Title: Re: Why Would The Earlier 1100 SACS Engine....
Post by: gyrogearcrunch on April 17, 2009, 12:28:18 AM

Quote from: pmackie on April 03, 2009, 09:57:36 PM

Hey Rick

I would have thought they would have been the same as well, so I can only speculate. Maybe:
- they found over time that the exhaust needed more clearance?
- newer exhaust valves are slightly different material, with different expansion characteristics?

It would be nice to know why.

Perhaps it's because exhaust valves run hotter, so they expand more and need a bigger cold clearance, otherwise you'd end up with poor valve seating of exhaust valves at final operating temperature?