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D17 Governor

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CTALLIS View Drop Down
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Joined: 22 Nov 2010
Location: Northfield
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CTALLIS Quote  Post ReplyReply Direct Link To This Post Topic: D17 Governor
    Posted: 24 Dec 2023 at 6:59am
have a d17 series 1. has 15.5 38 tires otherwise stock.
want to get a little more rpm
whats the best choice governor spring to use
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DrAllis View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 24 Dec 2023 at 9:17pm
A D-17 governor spring is the stiffest spring they ever made for that governor. You should be able to adjust your hand throttle linkage to get 2100 RPM. You want more ?? Hang another spring on the governor arm behind the generator to the block drain cock or grind material off of your governor weights to lighten them up.
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DaveKamp View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DaveKamp Quote  Post ReplyReply Direct Link To This Post Posted: 25 Dec 2023 at 11:09am
Grinding a little off the ends is the better choice imo, but when you do it, try to make them as consistent as possible. If you can make a jig and place them in a surface grinder, so they all cut together, then do, then match the weights with a balance.

If you DON'T have a surface grinder,  Here's a method that'll work:

Take a small pan, or even one made of a piece of aluminum foil... place a piece of steel in the pan that will allow you to place the weight with the pivot and force surface up, while the weight's nose sits on the bottom of the pan.

Pour some dychem into the pan, about 1/8" deep.  Remove the first weight, and place the second, then the third.  Now you've got three weights with dye to the same height.

Use a 4" grinder with a flap disk to carefully skim back the weight to the dye's edge.
Dip a machinist's ruler into the dye, and write down how DEEP the dye is.

Permanent marker- Letter the weights A, B and C.

Get out a precision balance, place one weight on one balance.  Write down WHICH of the three is the heaviest, and which is the lightest.

Place the lightest on the balance, and lightly brush off (or file) a little from the heaviest, until it matches the lightest.  Repeat for the remaining weight.

You'll have to install and test to determine how much faster the governor will reach neutral point.  Do yourself a favor and WRITE DOWN how much you took off, and what the resulting RPM was.  As you remove more, the change will increase, because the weight is tapered AND you're getting closer to the pivot point.  This chart will allow you to predict how much more you'll need to take, to get to your target speed.
Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest.
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DrAllis View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 25 Dec 2023 at 5:38pm
When I ground down a set, I took all the material right off the end, the farthest away from the pivot point. I just kept using a calipers to make sure the amount removed was the same and I wound up with 2600 RPM top speed.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tbran Quote  Post ReplyReply Direct Link To This Post Posted: 26 Dec 2023 at 6:31pm
keep in mind, you can rev it to what ever RPM you wish at no or light load - once the engine pulls down and the carb butterfly is wide open - the gov has nothing to do with rpms.  I would wager with 15.5 38's and a stock engine your gov weight mods will be good for a few feet. We built 226's with increased bore - increased compression , cam and head work and D19 carb on a bored out manifold and at about 65-75 hp- was at WOT 3/4 way down a track with smaller tires..  I do applaud your efforts. When you go for more rpms - then you will want more HP and more $ - been there it was fun. 
When told "it's not the money,it's the principle", remember, it's always the money..
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