D1005 Powered Geo Metro, Governor Help, please

[planejob]

Hello folks,
I've recently tucked a Kubota D1005 3 cylinder into a Geo Metro. Successfully.
Before you call BS, here's the video from last weekend: https://www.youtube.com/watch?v=_5cTk5PIzss

The issue I'm having is this: the engine was originally affixed to a generator and does not like to rev up. I'd like to turn it up to 3200 to 3600rpm.

I *do* want to keep the governor - there's no need to take it out and blow the thing up.

So my question is this, can I lighten the fly weights to increase the governor RPM? If I'm governed at X and I lighten the fly weights by half can I then rev to 2X? I think the engine is currently governed at somewhere near 2000 (the lever was set to 1800 for the generator). I have an optical tachometer from Amazon headed my way to confirm all of this.

If you are interested the struggles/build are chronicled <here>.

 

[coachgeo]

Hello folks, I've recently tucked a Kubota D1005 3 cylinder into a Geo Metro. Successfully. .....So my question is this, ....

LOVE IT. I'm putting a D722 in a Motorcycle.

While this is a GREAT site here at OTT...... There is not too many of folk in here who dive into modifying these little diesels. With that in mind; I'd Suggest you go to suckindiesel.com/thingy. Though it is a diesel motorcycle discussion board...... we do have to go thru the same issues of modifying IP's, Governors etc.

I seem to recall a thread there just on same topic (different motor, same issue)

 

[Dr Honda]

First.... I love anything diesel. Great job !! FYI... I have one of the first Ram EcoDiesel's to roll off the line, and love it. I can break 30 mpg on any long trip.


Anyway... I know you were asking about mod'ing the weights... but they used the 1000cc engine in some of the tractors at +3000 RPM. I would think you could just order the weight set from that pump. (don't know, just thinking out loud)


@Coachgeo : Do you have a link to your project bike?? I would love to see it too.

 

[coachgeo]

....@Coachgeo : Do you have a link to your project bike?? I would love to see it too.

Long soap opera thread and notes on her getting built are at site I sent this fellow to in second post of this thread.

She's not done yet.

 

[aeronutt]

Lighter weights or stronger springs will both increase top speed. Might try tying a few coils of the spring together with fine wire just to experiment with what difference it makes. That's an easy way to adjust the spring tension without making permanent changes. Filing down the weights is kinda permanent, so do a little bit at a time to make sure you don't overdo it.

Love the idea. Best wishes for a successful outcome!

 

[planejob]

Lighter weights or stronger springs will both increase top speed. Might try tying a few coils of the spring together with fine wire just to experiment with what difference it makes. That's an easy way to adjust the spring tension without making permanent changes. Filing down the weights is kinda permanent, so do a little bit at a time to make sure you don't overdo it.

Love the idea. Best wishes for a successful outcome!

Can you provide any guidance as to which spring controls the fly weights?

 

[aeronutt]

Can you provide any guidance as to which spring controls the fly weights?

I have never worked on that particular engine so I can only offer general concept help, not specific answers. Most fly weight type governors work on the same principle though so it shouldn't be too hard to figure out.
If you grab the fly weights and pull them out manually, the spring that resists that movement should be pretty easy to identify.

 

[North Idaho Wolfman]

You don't need to change anything, that model has an adjustable speed limit.

I'll send you a link to download a WSM (service manual) for a b2110, that has the same motor as your working with, look at page 1-S26 for the adjustment bolt.

 

[JeffL]

How can you not love this.
If it does not work out you can always mount a snow blower or blade on the front and sell it in Michigan.

 

[D2Cat]

What do you mean, if it doesn't work out... He's already posted video of driving it around the block!

When you take an idea no one else had done and get it to the stage Planejob has, it's pretty well worked out. He's just fine tuning now.

No backing up to a snow blower, at least not because of failure to original project.

 

[JeffL]

D2Cat I was just making a joke. The same type I heard about the tractor engines in our old British sports cars. I am in full agreement on the accomplishments of this project.
I can't wait to hear the fuel consumption numbers.

 

[D2Cat]

JeffL, I took no offense, just supporting the new poster. Hope he sticks around!

 

[planejob]

Hey, I am sticking around a while, I've got to figure this thing out.

I have good news and bad news:
First, the car runs down the road just fine. I got a transit permit for it and took it up to get an exhaust put on. The guys at the "Wylie Used Tire and Muffler" thought this was a sight to behold. I got the exhaust.

The car maxed out at about 42 MPH. It takes off in 1st too easily - it's a granny gear that won't be of much use as is*. It takes off in second fine. THird and fourth are easy enough, but fifth... non existent. pulled the 'top hat' on the tranny and both the fifth gear drive and driven gears were toast. Eaten up so bad I could spin them by hand in opposite directions simultaneously.

So I tried to warranty the junkyard box - they said sure - you can have any transmission in the yard... too bad they didn't have a single manual Geo tranny in any of their three yards. That took a whole Saturday. The decision was made to rebuild.

I don't know anything about rebuilding Geo Transmissions... but I'm about to learn!

So you saw the asterisk earlier... in the process of deciding to rebuild I was offered a new Final Drive for the transmission. I'm going from a 4.1 final to a 3.52 final. (16%)

Without even changing my guvna I'll be able to touch 60mph! I'd like to turn it up to 3000, that would be good for 75 (unless I become drag limited). 3600 would allow the gearing to carry it to 91mph, but I'm not sure how steep the hill would have to be to overcome the drag

I got the WSM from North Idaho Wolfman, so a big THANKS for that. I'll study on it over the next few days.

 

[Billdog350]

Hey Planejob, congrats on your success so far! I give you a lot of kudos for taking on such a serious fabrication and engineering effort.

When I read your post the first time, it looked like you tried starting in first, then starting in second, then starting in third and so on. It seemed like starting in 5th is what blew the tranny....then I read back and I suspect you were just saying you can start in first or second, third and 4th shift ok, and then 5th didn't exist when you shifted into it.

Good luck with the rebuild. I wonder what issues you might have with the torque on that D1005 destroying the trans? Be careful not to start in too high of a gear...

Getting that final drive lower will be a HUGE help. Diesels always like a lower final compared to a gasser.

I would say starting with a gov setting around 2800 would be a good start (lots of the Kubota's are rated at that rpm) and see if it serves your needs. Since you're not trying to make a rocket, just a MPG beast, 75 would likely be as fast as you'd want to go. 3600 is pushing it in a Kubota (or any diesel rated for 2500-3000rpm) IMO.

There are a few guys who slipped turbos into their tractors...that's your next mod! More hp and likely a little better MPG.

 

[D2Cat]

It's too early for me to think clearly. Isn't he going to a higher final drive? " I'm going from a 4.1 final to a 3.52 final. (16%)"

 

[Billdog350]

Going TO a 3.52 will LOWER his RPM and give him higher top speed before the governor kicks in....

think of it this way, the current one needs the engine/transmission to turn 4.1 times for every revolution of the wheel, it WILL be only 3.52 times to get the wheel to turn once.

 

[Ramos]

Going TO a 3.52 will LOWER his RPM and give him higher top speed before the governor kicks in....

think of it this way, the current one needs the engine/transmission to turn 4.1 times for every revolution of the wheel, it WILL be only 3.52 times to get the wheel to turn once.

And that, my friends, is expressed as HIGHER gearing.