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Author Topic: Inline-four crankshaft  (Read 201815 times)

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Offline Jack Gifford

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Re: Inline-four crankshaft
« Reply #480 on: July 03, 2019, 02:06:00 AM »
I have a gravity feed gasoline primer system for cold-starting that works well. A cable in the cockpit opens a spring-return valve to drip gas into a couple of unused nozzle ports in the injector. In the interest of fitting body panels, I want to replace it with a small electric pump and tank mounted lower than the injector. But the pump's valves won't prevent siphoning of gas when the engine is running. I need suggestions for how to prevent the siphoning. My only thought so far is to use a solenoid valve that opens only when I activate the pump. But that's a little bit cumbersome. Any thoughts?
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Offline jacksoni

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Re: Inline-four crankshaft
« Reply #481 on: July 03, 2019, 06:12:45 AM »
Since you have already thought of this idea but are looking for others, this may not help but if you do go this way here is a source I used for a bigger one. This valve is normally closed so could operate just with the pump as you say. Many sizes are available. Normal fuels are but not sure about nitro and such:
https://www.electricsolenoidvalves.com/1-8-12v-dc-electric-brass-solenoid-valve-12-volt/
Jack Iliff
 G/BGS-250.235 1987
 G/GC- 176.245  2018
 G/GMS-182.144 2019

Offline RichFox

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Re: Inline-four crankshaft
« Reply #482 on: July 03, 2019, 07:47:42 AM »
I used a solenoid from a NOS kit.

Offline Jack Gifford

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Re: Inline-four crankshaft
« Reply #483 on: July 04, 2019, 01:24:14 AM »
jacksoni- Thanks for the link to "electricsolenoidvalves".
RichFox- Yeah, I was thinking of using a nitrous solenoid from my junk box.

I just ordered a Facet 2psi solid-state pump from Aircraft Spruce. Wiring is done except to the pump & solenoid.
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Offline Jack Gifford

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Re: Inline-four crankshaft
« Reply #484 on: July 24, 2019, 12:16:09 AM »
The electric gas-priming system is done and working well. Had to build a shield by the little tank, since it's in the plane of the blower drive. Using old nitrous pieces had the bonus feature of tiny-orifice nozzles to gain a little atomization of the gasoline.

Next up- Pontiac Nationals at Summit Raceway in Norwalk Ohio a week from now. Hoping to get a test run or two on the quarter-mile strip (all of 1,320' vs. the 528' of South Butler!). Hopefully I'll remember to look at some gauges :oops:. Maybe even get to test chute deployment- although probably not needed, with the great 4-wheel disc brakes on the car.
« Last Edit: July 24, 2019, 12:28:15 AM by Jack Gifford »
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Offline jacksoni

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Re: Inline-four crankshaft
« Reply #485 on: August 04, 2019, 11:40:15 AM »
Happy Birthday Jack!!! :cheers:

Good luck at Summit testing.
Jack Iliff
 G/BGS-250.235 1987
 G/GC- 176.245  2018
 G/GMS-182.144 2019

Offline Jack Gifford

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Re: Inline-four crankshaft
« Reply #486 on: August 06, 2019, 11:34:34 PM »
Thanks for the birthday wishes- 79 now!
Only got in one run at Summit Raceway. Still no bad news, other than "operator error". I [somehow?] put wrong gears in- 88 mph at end of strip @ just 4,700 RPM!
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Offline Jack Gifford

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Re: Inline-four crankshaft
« Reply #487 on: August 16, 2019, 11:39:54 PM »
Hoping to get more testing time at the local tenth-mile drags August 25th. With more appropriate gearing! :oops:
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Offline Jack Gifford

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Re: Inline-four crankshaft
« Reply #488 on: August 28, 2019, 12:27:10 AM »
Once more the car treated me good, no issues. Well... some things to improve on- discovered that the helmet/HANS doesn't allow my head to tip enough to see harness buckle, and a few other inconvenient items.
Tenth-mile speed was 85.3 MPH @ 7,100 RPM, which is getting closer to where I want to test the engine.
M/T Pontiac hemi guru (or does guru status expire after 30 years?)

Online RidgeRunner

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Re: Inline-four crankshaft
« Reply #489 on: August 28, 2019, 05:25:50 AM »
    Noise without expensive breakage is always great  :cheers:

                     Ed