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PostPosted: Sat Feb 17, 2018 9:48 pm 
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New Precision Matters Auto Prime
Modern gas is far superior to what we had when our cars were new, but between the ethanol and the formulation for closed F-I systems, it is also extremely volatile and it leaves our carbs high and dry in a very short time. Until now that has meant a lot of cranking or some modifications to the car.
We are very proud to introduce our new Auto Prime product, designed to quickly and automatically prime your dry carburettors: Step on the gas, hold it for several seconds, and start your engine. Plus, our design automatically refills while you drive without starving the carbs. All with zero modifications to any metal part of the car.
Attachment:
Instuctions 001.JPG
Instuctions 001.JPG [ 1.22 MiB | Viewed 1319 times ]

Yes, it works. As with most of our products, it’s been tested on my personal car. On (dry) installation of a prototype, it was filled after approximately 3 miles of city driving. After two weeks of sitting (and drying), I lifted the deck lid, held the carb levers at full throttle, and heard the satisfying ‘gurgle’ of fuel going down and air going up. The car started instantly with the standard half-open throttle and a bit of pumping to keep the cold engine from quitting at idle. It got less than a mile or so to refill, but seems to have done so. Since then, I’ve ignored it and while it has yet to sit another two weeks, it’s had one instance of a week to dry out; same result.
The total capacity of the canister and the hoses approximates 30cc; far more than enough to start a car in any reasonable state of tune. I don’t know how long it will stay full; the two-week-try seemed to be full, and the molecules attempting to escape to the atmosphere are going to have to pass up the fuel line, through the float valve and into the float bowls to find their way out. Let’s just say it’ll take a while.
It installs with hoses/clamps, and the nylon-ties you see fastening the actuating ‘Blade’ to the forward throttle lever; no holes to drill, no electrical parts/mounting/wiring, no outboard motor parts in your engine bay.
And, except for the same hoses you trust every time you start your car, it is all metal; fool-proof and safe. Oh, and any change in the force required to push the throttle remains theoretical and undetectable.
We are proud to introduce the Auto Prime and will have a display unit at the Lit Meet for your examination. Plus we’re offering a limited number of pre-orders available at an introductory price. Please stop by the Precision Matters table and take a look.
(edit; note to self: Proof read before posting)

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Last edited by Ron LaDow on Sun Feb 18, 2018 12:11 am, edited 1 time in total.

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PostPosted: Sat Feb 17, 2018 11:02 pm 
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Does the canister move up every time you step on the gas?

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PostPosted: Sun Feb 18, 2018 12:09 am 
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Martin, yes it does and the design addresses that to keep fuel in the canister for use on starting.

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PostPosted: Sun Feb 18, 2018 1:01 am 
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That is simple and clever.

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PostPosted: Sun Feb 18, 2018 2:20 am 
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To quote something I've seen on the internet,
"Shut up and take my money!"

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PostPosted: Sun Feb 18, 2018 8:58 am 
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Hi Ron, nice product but where did you get that fantastic cheesehead screw? Hope you sell many at the lit show.

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PostPosted: Sun Feb 18, 2018 9:45 am 
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Ron,
Is there one canister on each side for each carb?


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PostPosted: Sun Feb 18, 2018 1:25 pm 
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DonCichocki wrote:
Ron,
Is there one canister on each side for each carb?

Don, this was one of those design developments where it got simpler as it progressed.
It started with a fairly complicated linkage to empty two canisters and probably would have never sold. But as the sketches went through the "Revs", it became obvious that was not necessary.
Some of the "Rube Goldberg" sketches from last Fall are funny, looking back on them.

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PostPosted: Sun Feb 18, 2018 1:33 pm 
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Adam Wright wrote:
To quote something I've seen on the internet,
"Shut up and take my money!"

Still waiting on the final number from at least one supplier. I'll have pricing on it this coming week.

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PostPosted: Sun Feb 18, 2018 5:39 pm 
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nice product , would like to have it, but I have one possible concern

How much will the rubber hose travel for zero to top? i think perhaps 20mm x multiple throttle actions on a long trip / develop
rubber fatique ?

rg.Lars

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PostPosted: Sun Feb 18, 2018 8:29 pm 
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Lars Hvidsteen wrote:
nice product , would like to have it, but I have one possible concern
How much will the rubber hose travel for zero to top? i think perhaps 20mm x multiple throttle actions on a long trip / develop
rubber fatique ?
rg.Lars

Lars, this got quite a bit of thought.
You can look high and low for any engineering calcs for cycles-to-failure, and since hydraulic lines (think brake lines) are commonly cycled, that seemed to indicate it is not a major issue.
So I checked various sources for 'good design practice': keep the pressure low, generous bend radius, small cycle excursion, no rubbing.
And I think we're in good shape; pressure is <1/20th of rating, 12" - 14" bend radius (3" on the spool), max excursion of <20*, with a typical excursion of probably <10*, good clearance all around.
Horse-back guess; it'll need replacement about the time the engine needs a rebuild.

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PostPosted: Tue Feb 20, 2018 11:08 pm 
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Lars,
The web page is up now; see here for the flex limits in use:
http://www.precisionmatters.biz/auto-pr ... er-kit.php

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