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82 vs 83 gs1100e cams

I know the ex. cam changed, but I can't find it now & can't really remember if it was between "81" & "82", or between "82" & "83". Originally the ex. cam was a slight bit milder than the in., but after the change they were almost the same.
 
My factory manual notes a cam change between the 81 and 82 years. I do not have the manual handy, but PM me if you want me to look up the changes.


Mark
 
Topends are identical on the '80, '81, and '82.

In 1983, Suzuki decided to increase mid range grunt at the slight expense of top end. Engineers did this by increasing inlet and exhaust valve lift (intake: from 7.0 to 7.5 mm, exhaust from 6.5 to 7.0 mm), advanced the intake timing 13 degrees (relative to crank position), extended the exhaust valve timing on both ends and consequently increased valve overlap.

The 1983 intake cam retained the '82's 280 degrees of duration, but opened at 43 degrees TDC instead of the '82's 30 degrees, and closed at 57 degrees before BDC rather than the previous year's 70 degrees.

That, coupled with the third airbox design in four years, made the '83 GS1100 engine the strongest running of the four different model years.
 
Sorry for the bad imfo. I guess the older my brain gets, the more this will happen. I do remember I had access to a set of the newer cams, and only replaced the ex. cam. I was trying to get the best out of my "80" 1100 "E" while using stock parts only. There was a reason I didn't use the intake cam, I thought it was because it didn't change, but it must have been something else.
 
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