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Snowcat Restoration & Modification Projects Forum Major Restorations, Upgrades, and Non-Stock Snowcat Modifications

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  #21  
Old 03-20-2016, 08:13 PM
Pontoon Princess Pontoon Princess is online now
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Default Re: Progress on IMP

very sharp looking machine, nice improvements, good job, sure glad you got those carbon credits
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  #22  
Old 03-21-2016, 10:00 AM
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Default Re: Progress on IMP

Nice job. We got about 8" in Mass today. Hope you get to get it snowy new few days before the big melt!
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  #23  
Old 03-23-2016, 12:25 AM
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Default Re: Progress on IMP

Great looking imp
I'm the new owner of a 72 imp and want to put a muffler on the exhaust currently it is straight piped o under the passenger door. I was thinking of turning the corner and running it out the back with a glass pack any suggestions
Snowgeorge 72 imp
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  #24  
Old 03-23-2016, 08:38 AM
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Default Re: Progress on IMP

Quote:
Originally Posted by Snowgeorge View Post
any suggestions
Snowgeorge 72 imp
Sure.

First off, I'd suggest starting a new thread about your own cat. It keeps things a little easier to follow. People will post advice to you on your thread, and this guy's thread stays a bit more on-topic.

Second, I'd suggest tacking on a photo of your cat. Yes, we've all seen pictures of an Imp before. But we're all voyeurs and want to see more. Sort of the old expression about "you'll catch more flies with honey...". The more honey, the more bees.



Third, do you want a muffler or a glass-pack? From my experience as a kid, they are not synonymous. Maybe it was my accelerator foot, but glass-packs never did much muffling where I was.

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  #25  
Old 01-16-2017, 12:02 AM
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Default Re: Progress on IMP

I'd love to see some more info on your Hydro steering setup do you have any pictures of it and do you care to share some info about it?

Thanks

Scot
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  #26  
Old 01-17-2017, 11:13 AM
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Default Re: Progress on IMP

We used a small belt driven Victor pump mounted on motor with a left and right solenoid valves actuated by an electronic joystick. I have the PSI set at 400 with a return flow gate. 6 gallons of ATF. Two small hydro pistons in the back that the flow is adjustable for speed. I used a return spring similar to the stock ones just a little heavier.
Here is a sketch of how it works and a pic of the pistons in the back and a partial look at where I mounted the solenoid panel in the tunnel.
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  #27  
Old 01-18-2017, 03:32 PM
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Default Re: Progress on IMP

I see a couple of issues that could be a concern:

1. With solenoid valves the brakes are either on or off. I have found that when driving my cat, which has the same differential/brake unit as yours, that I make a lot of fine adjustments to the steering. Especially when traversing a slope as the cat will always want to turn downhill. Brake application while traveling along can vary from minimal to maximum and everything in between. With a non proportional system, you may find your steering to be very jerky and have difficulty with overcorrecting. With the high grousers you are using, this could put a lot of stress on the drive system. The only time I use full steering force is in a tight turn and even then rarely. Most of the time it is just small light momentary pulls on the levers.

If you are in fact using proportional hydraulic valves then this would not be a problem, but gets way more complicated with amplifiers, feedback and gain control, etc.

2. With a dead engine, you have no brakes or steering.

I have a lot of experience in hydraulic control systems (machine tools and aircraft) and just wanted to make you aware of potential issues with a non proportional steering system.
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Last edited by turbinator62; 01-18-2017 at 03:51 PM. Reason: add text
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  #28  
Old 01-18-2017, 04:23 PM
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Default Re: Progress on IMP

Looking sweet.

Gonna be a great ride
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  #29  
Old 01-18-2017, 05:13 PM
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Default Re: Progress on IMP

Quote:
Originally Posted by turbinator62 View Post
I see a couple of issues that could be a concern:
1. With solenoid valves the brakes are either on or off.
.
The way I avoid this on my tractors, is use either a flow restrictor orifice or a needle valve. The issue then becomes that when you want a full cylinder, you are still stuck with the slower action. I've done solenoids and the trick is getting the balance between flow and speed to achieve what you want. If you really want the electric over hydraulic, you might need a second circuit that trips when the joystick is at extreme, with no restriction. "wham" you be at full brake on that cylinder. But that adds a lot of complexity that I wouldn't want.

Great thought project
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  #30  
Old 01-23-2017, 07:08 AM
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Default Re: Progress on IMP

Had her out yesterday and everything worked great. Steering is flawless and just like with the levers you can moderate the turn with the joystick. Despite the high grousers we didn't break anything and had awesome traction up some steep uphills and no problem sidehilling.
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  #31  
Old 01-23-2017, 07:43 PM
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Default Re: Progress on IMP

Sounds like you hit the perfect combination of pressure and flow for your system. Glad to hear it is working well. Do you modulate the turn by the amount of time you deflect the stick or do you have to bump it multiple times? What type of side stick controller are you using?
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  #32  
Old 01-30-2017, 07:01 AM
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Default Re: Progress on IMP

Bumping it while underway makes the small adjustments to the turn and is predictable as I am getting the hang of it after the weekend.
Got some time in the IMP with family and friends during the day and at night using the LED's. Everything worked well and put it to the test up some bigger hills. The small LED's on the sides really light up the ground beside the machine and help everyone in. Here's a pic looking west with Mt. Washington hidden in the clouds.
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  #33  
Old 01-30-2017, 09:48 AM
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Default Re: Progress on IMP

Thanks for posting your build. Really,really nicely done.
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  #34  
Old 01-30-2017, 09:51 AM
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Default Re: Progress on IMP

What a nice job .
Have fun
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  #35  
Old 01-30-2017, 09:55 AM
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Default Re: Progress on IMP

You did a fabulous job on the rebuild and rear cab. I love the LEDs on my cat too. All of these modern devices that are accessible to anyone nowadays gives these 40-50 year old machines new life.
Glad to know the hydraulic steering is working well. That sure clears out the area in front of the drivers seat. It is always a chore climbing in and out of these things especially when you are old. Now that everyone knows it works, other guys will probably work off your design.

Have fun and be safe.
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  #36  
Old 01-30-2017, 12:05 PM
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Default Re: Progress on IMP

Thanks for the praise. We had a lot of fun building our IMP. Working on our 2nd machine now and will post pics of our crew cab build when a little further along.
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  #37  
Old 02-18-2018, 05:24 PM
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Default Re: Progress on IMP

What did you use to insulate the walls? It looks like black rubber with a diamond plate pattern.
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