UPDATE 2 Adjusting timing propane engine and impco 425 mixers

Propane, Butane, LPG, GPL, C3H8, C4H10
storm
Posts: 796
Joined: Wed Jan 10, 2007 10:10 pm
Location: NSW, Australia

Re: Adjusting timing propane engine and impco 425 mixers

Post by storm »

Caddy123 wrote:
Fri Dec 07, 2018 3:43 pm
Ok last question.
1 mixer doos not respond on the idle screw (2000 miles on it) only if i screw it in far.
Ps mixer 2 is new! Respond perfect.
Or do i have a vaccuum leak?
2 things come to mind
1. Idle diaphragm may be faulty (hole in it?)
2. Do you have a separate regulator/converter for each mixer? If yes swap them over and see if the difficult idle setting changes to the other mixer.
Fuel flow requirements calculations
Engine air flow requirement calculation: CFM = Cubic Inches x RPM x Volumetric Efficiency (VE) ÷ 3456

Caddy123
Posts: 30
Joined: Sat Dec 01, 2018 2:41 pm
Location: Netherlands

Re: Adjusting timing propane engine and impco 425 mixers

Post by Caddy123 »

Test
Last edited by Caddy123 on Fri Dec 07, 2018 6:11 pm, edited 1 time in total.

Caddy123
Posts: 30
Joined: Sat Dec 01, 2018 2:41 pm
Location: Netherlands

Re: Adjusting timing propane engine and impco 425 mixers

Post by Caddy123 »

:roll:

storm
Posts: 796
Joined: Wed Jan 10, 2007 10:10 pm
Location: NSW, Australia

Re: Adjusting timing propane engine and impco 425 mixers

Post by storm »

There is a size (how many Megabytes) limit on attachments. If your test didn't work it may be because you are trying to attach a file that is to large.
I just did a test and 2MB seems to be the limit, anything over that and it won't even try.
Fuel flow requirements calculations
Engine air flow requirement calculation: CFM = Cubic Inches x RPM x Volumetric Efficiency (VE) ÷ 3456

Caddy123
Posts: 30
Joined: Sat Dec 01, 2018 2:41 pm
Location: Netherlands

Re: Adjusting timing propane engine and impco 425 mixers

Post by Caddy123 »

IMG-20181208-WA0009.jpg
IMG-20181208-WA0012.jpg
IMG-20181208-WA0012.jpg
Attachments
IMG-20181208-WA0010.jpg

storm
Posts: 796
Joined: Wed Jan 10, 2007 10:10 pm
Location: NSW, Australia

Re: Adjusting timing propane engine and impco 425 mixers

Post by storm »

Nice plenum. You have 2 Impco E regulators, from my understanding they are better off being mounted with the vapour hose at the bottom.
Fuel flow requirements calculations
Engine air flow requirement calculation: CFM = Cubic Inches x RPM x Volumetric Efficiency (VE) ÷ 3456

Caddy123
Posts: 30
Joined: Sat Dec 01, 2018 2:41 pm
Location: Netherlands

Re: Adjusting timing propane engine and impco 425 mixers

Post by Caddy123 »

Jes there impco E regulators.
I know there upside down.
This was better for the vapor hose.
I drive 3000 miles a year in the summer.
I can reach them easy so i can clean and check them on the( i think) 10000 miles.
Screw the top of and go😎
So the rest of the evaporator can stay on plase

storm
Posts: 796
Joined: Wed Jan 10, 2007 10:10 pm
Location: NSW, Australia

Re: Adjusting timing propane engine and impco 425 mixers

Post by storm »

Have you swapped the regulators (or mixers) around to see if the idle tuning problem switches to the other mixer?
Fuel flow requirements calculations
Engine air flow requirement calculation: CFM = Cubic Inches x RPM x Volumetric Efficiency (VE) ÷ 3456

Caddy123
Posts: 30
Joined: Sat Dec 01, 2018 2:41 pm
Location: Netherlands

Re: Adjusting timing propane engine and impco 425 mixers

Post by Caddy123 »

No i have a little vaccuum problem.
The mixer that not respond have a gasket leak.
My mate have welded the plenium but i have not check for straightness so i must take it appart and milling it.
Next week.
If its ready you hear.

Caddy123
Posts: 30
Joined: Sat Dec 01, 2018 2:41 pm
Location: Netherlands

Re: Adjusting timing propane engine and impco 425 mixers

Post by Caddy123 »

Is this a good afr reader for my set up (i like the$)
From edelbrock only it measures with 0.5 v and not 0.1v.
there expencive.
https://www.amazon.com/Edelbrock-6593-F ... B00062YBES

storm
Posts: 796
Joined: Wed Jan 10, 2007 10:10 pm
Location: NSW, Australia

Re: Adjusting timing propane engine and impco 425 mixers

Post by storm »

Personally I'd say no, try one of these instead https://www.innovatemotorsports.com/xca ... hp?cat=261
Fuel flow requirements calculations
Engine air flow requirement calculation: CFM = Cubic Inches x RPM x Volumetric Efficiency (VE) ÷ 3456

Steptoe
Posts: 1504
Joined: Fri Feb 02, 2007 8:32 pm
Location: JAFA , New Zealand

Re: Adjusting timing propane engine and impco 425 mixers

Post by Steptoe »

I use an inovate, older model.

The vapour hose go to the bottoms as LPG is not clean.. has oils/wax and such in it.
With hose at the bottom, these flow thru and drop out.. at the top or side collect very quickly inbehind the diapham.
My Spelling is Not Incorrect...It's 'Creative'

Caddy123
Posts: 30
Joined: Sat Dec 01, 2018 2:41 pm
Location: Netherlands

Re: Adjusting timing propane engine and impco 425 mixers

Post by Caddy123 »

Thanks for the input.
I turn the regulators and buy a good afr.
Gr Danny

Steptoe
Posts: 1504
Joined: Fri Feb 02, 2007 8:32 pm
Location: JAFA , New Zealand

Re: Adjusting timing propane engine and impco 425 mixers

Post by Steptoe »

If it just points downwards.. does not need top be actually pointed down all the way.
Just enough , so the wax cant accumulate.
I put near on 200,000 miles near vertical and had a little build up in the cnr at the bottom.. not enough to effect anything.
If built up, clean out with kerosene and a paint brush.. if bad may need a bit of a soak.
My Spelling is Not Incorrect...It's 'Creative'

Caddy123
Posts: 30
Joined: Sat Dec 01, 2018 2:41 pm
Location: Netherlands

Re: Adjusting timing propane engine and impco 425 mixers

Post by Caddy123 »

Ok thanks steptoe i check them 👌

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