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Thread: GS/GSXR 16V Valve Lift/Diameter

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    Default GS/GSXR 16V Valve Lift/Diameter

    EDIT:
    Lift=(Max-Min)*1.52 keep units consistent.

    Quote Originally Posted by rapidray View Post
    The GS rocker ratios vary, due to production tolerances, but the COMMON figure is 1.516-1.526.
    Ray.

    EDIT: Note even though the 83 GS1100ED Factory manual specs say the cams are 7.0mm and 7.0mm, the cams typically installed are 7.5/7mm (Int/Exh).

    EDIT: 83 GS750E cams are (7.5 mm intake and 6.5 mm exhaust) as per the manual.

    Here is a tabulation of valve lift/diameter from the official Suzuki manuals as well as Webcam and Megacam websites. Let me know if i screwed something up. I tried to be careful.


    Last edited by posplayr; 01-31-2016 at 05:27 PM.
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    Jim,
    I used an '81 GS1100 EX intake cam in my sons '81 GS750EX. This is with porting and backcut valves with stock 23 and 20 mm valves. His bike is a strong performer and pulles very hard from down low to red line. It also has a V&H four into one with the 530 drive chain conversion. Rejetted stock carbs, with factory airbox. Very happy how it turned out. A very reliable and good running street bike that will pull right up to the 140 mark (calculated). Thanks to Bill, (Chef) for one of the carbs..and tuning help. That.. saved the day.

    Terry
    1980 Suzuki GS550E, 1981 Suzuki GS 1100EX all stock, 1983 Suzuki GS 1100EX modified, 1985 GS1150E, 1998 Honda Valkyrie Tourer, 1971 Kawasaki Mach lll 500 H1, 1973 Kawasaki Mach lV 750 H2.

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    Quote Originally Posted by headsbikesmopars View Post
    Jim,
    I used an '81 GS1100 EX intake cam in my sons '81 GS750EX. This is with porting and backcut valves with stock 23 and 20 mm valves. His bike is a strong performer and pulles very hard from down low to red line. It also has a V&H four into one with the 530 drive chain conversion. Rejetted stock carbs, with factory airbox. Very happy how it turned out. A very reliable and good running street bike that will pull right up to the 140 mark (calculated). Thanks to Bill, (Chef) for one of the carbs..and tuning help. That.. saved the day.

    Terry
    Terry,
    I have to also report that the 1100 head you did for me with 28mm stock 1150 valves and your street port job has plenty of mid range, runs cooler and gets better gas mileage than expected. I'm basing this on comparisions between Bill and my bikes. Of course it has not always been an exact comparision but as a general rule the head work has improved my machine all around. It also has a very distictive sound kinda like a jet .

    Anybody looking for some reasonable head work give Terry a call. He will do right by you.

    http://www.thegsresources.com/_forum...3&postcount=29

    Jim
    Last edited by posplayr; 07-17-2010 at 01:04 PM.
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    Thanks Jim..
    Glad to help. Your head (on my bench) flows about 10 feet (cfm) better than a stock 1150 head. Should be a good performer. The 'most flow with the smallest port'... (street) Hold onto that rack for me..I am out of town now but will be intouch next week. thanks buddy.

    Terry
    1980 Suzuki GS550E, 1981 Suzuki GS 1100EX all stock, 1983 Suzuki GS 1100EX modified, 1985 GS1150E, 1998 Honda Valkyrie Tourer, 1971 Kawasaki Mach lll 500 H1, 1973 Kawasaki Mach lV 750 H2.

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    Quote Originally Posted by headsbikesmopars View Post
    Thanks Jim..
    Glad to help. Your head (on my bench) flows about 10 feet (cfm) better than a stock 1150 head. Should be a good performer. The 'most flow with the smallest port'... (street) Hold onto that rack for me..I am out of town now but will be intouch next week. thanks buddy.

    Terry

    Just for some more background when Terry and I discussed my head, he could have made it flow 110-115 CFM, but I opted for stock OE parts (28mm intake valves) and with some mild but skillful porting; he increased the flow in the head by about 20% from stock.

    In the figure below you can see the comparison of flow with the stock head and then after the port work. The intake side went from 27mm (stock 1100) to 28mm (stock 1150) so there is a step change in increased flow. In comparison see the difference in flow rate in the exhaust due just to Terry's port work.

    My objective was to get the 1100 to be about 10 hp faster than a stock 1150 with an 1100 head. I also have 1166 cc, Web cams 0.340 and jetted (145 mikuni) 1150 36mm carbs. If you recall, Suzuki discovered in 1982 that there were consistent measureable differences in ET for bone stock bikes. They tracted it down to variations in production machine work tolerances in the valve seat area. Tightened tolerances in the seat work is another part of why the 83 1100ED is faster than the prior 1100's.

    Except for running at 10K ft and being jetted for sea level the bike runs very well.

    P.S. the X and Y labels are reversed CFM is on the vertical axis.

    Last edited by posplayr; 07-18-2010 at 01:13 PM.
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    Pops - thanks for that but how do any of your numbers relate to the measurements I have made?

    What do I need to do to identify what I have?

    Greetings
    Richard

    GS1150 EF bought Jun 2015
    GS1150 ES bought Mar 2014: ES Makeover Thread AND blog: Go to the Blog
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    GS1100 G (1) Dad bought new 1985 (in rebuild) see: Dad's GS1100 G Rebuild AND blog: Go to the Blog
    Previously owned: Suzuki GS750 EF (Canada), Suzuki GS750 (UK)(Avatar circa 1977), Yamaha XT500, Suzuki T500, Honda XL125, Garelli 50
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    Quote Originally Posted by londonboards View Post
    Pops - thanks for that but how do any of your numbers relate to the measurements I have made?

    What do I need to do to identify what I have?

    Greetings
    Lift=(Max-Min)*1.52 keep units consistent.

    Quote Originally Posted by rapidray View Post
    The GS rocker ratios vary, due to production tolerances, but the COMMON figure is 1.516-1.526.
    Ray.
    Last edited by posplayr; 01-31-2016 at 05:27 PM.
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    Quote Originally Posted by posplayr View Post
    ...If you recall, Suzuki discovered in 1982 that there were consistent measureable differences in ET for bone stock bikes...
    July 1982 Cycle World road test of the 1100e:

    "The only other engine changes were performed in the valve area. Suzuki noticed during the past two years that, while all GS1100s were fast, some were slightly faster than others; some owners complained of having riding buddies whose GSs were faster than their own. These slight differences in performance were attributed to small inconsistencies in factory machining around the valve seats. A quality control program was then started to make sure each cylinder head was machined up to blueprint specs in this critical area."
    1982 GS1100E V&H "SS" exhaust, APE pods, 1150 oil cooler, 140 speedo, 99.3 rear wheel HP, black engine, '83 red

    2016 XL883L Two-tone blue and white. Almost 42 hp! Status: destroyed, now owned by the insurance company. The hole in my memory starts an hour before the accident and ends 24 hours after.

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