Search found 1056 matches

by C3H8
Sat Mar 28, 2020 1:35 pm
Forum: Propane Forum
Topic: Lean out at WOT. Fine at 3/4 throttle
Replies: 13
Views: 85

Re: Lean out at WOT. Fine at 3/4 throttle

Regarding Having 2 fuel tanks in the trunk, I could disable one or the other, to rule out any tank-related issues. Unless you have sperate hoses from each tank going all the way to the engine compartment switching tanks will not reveal if there is a collapsed inner liner in the hose. That's why I re...
by C3H8
Fri Mar 27, 2020 6:24 pm
Forum: Propane Forum
Topic: Lean out at WOT. Fine at 3/4 throttle
Replies: 13
Views: 85

Re: Lean out at WOT. Fine at 3/4 throttle

Further to my previous response. The fact your mixtures are leaning even sooner now points to one of several problems. 1. The primary seat has separated from the backing and is plugging the vap inlet. 2. Problem with the lockoff or filter (you say you checked those already. 3. Collapsed inner liner ...
by C3H8
Fri Mar 27, 2020 6:16 pm
Forum: Propane Forum
Topic: Lean out at WOT. Fine at 3/4 throttle
Replies: 13
Views: 85

Re: Lean out at WOT. Fine at 3/4 throttle

You don't have to take it all apart. The foam filter is unlikely to cause this. It's main function is to trap liquid LPG on start up which is then released as the vapourizer warms up. To test the vapourizer to see if there is an issue with it or somewhere before it you need to put a pressure gauge o...
by C3H8
Sat Mar 21, 2020 1:26 pm
Forum: Propane Forum
Topic: L67 LPG options?
Replies: 2
Views: 72

Re: L67 LPG options?

If I understand your question correctly the Gann/impco adaptor for dual 425's vertical mount is AA3-80. Several are available on Ebay.
by C3H8
Mon Mar 16, 2020 1:06 am
Forum: Propane Forum
Topic: Dual carbs with propane?
Replies: 25
Views: 4260

Re: Dual carbs with propane?

Thanks for the compliment storm, appreciate it. To clarify the valve build up issue. True story about a first generation 300 CI Ford (long time ago, 1980's). My dealer called me because a customer lost power on his engine. approximately 10,000KM's on it. When I got there we did a compression test an...
by C3H8
Mon Mar 16, 2020 12:52 am
Forum: Propane Forum
Topic: mkiv 454 big block and impco300 mixer too small?
Replies: 7
Views: 479

Re: mkiv 454 big block and impco300 mixer too small?

A 454 only flows 450 CFM at 4500. Not an exact number. On over the autos the preference is to over carburate slightly. In other words the 425 mixer would be close to ideal unless your wot operation is over 5000 RPM and you say you top out at 4500. The 300 50 series is marginally small. Either way if...
by C3H8
Sat Mar 07, 2020 2:04 pm
Forum: Propane Forum
Topic: Dual carbs with propane?
Replies: 25
Views: 4260

Re: Dual carbs with propane?

HI everyone, I was beginning to think we had all disappeared. Nice to see all the feedback. I'm going to clear up two things. The Ford 300 F150's in NA have a longer stroke then bore as far as my old memory can remember. I decided to look it up and storm is actually correct. The bore and stroke are ...
by C3H8
Thu Mar 05, 2020 7:03 pm
Forum: Natural Gas Forum
Topic: CNG Advance curves vs LPG or 'The Liquid' with a classic
Replies: 3
Views: 3397

Re: CNG Advance curves vs LPG or 'The Liquid' with a classic

I should have also mention that the curve you attached is typical, however you can see their example indicates what I was talking about. At WOT their curve shows about 12 or 14 degrees advance on petrol at 2500 RPM. The NG curve it topped out at approx. 38 degrees. In these cases the vacuum advance ...
by C3H8
Thu Mar 05, 2020 6:50 pm
Forum: Natural Gas Forum
Topic: CNG Advance curves vs LPG or 'The Liquid' with a classic
Replies: 3
Views: 3397

Re: CNG Advance curves vs LPG or 'The Liquid' with a classic

Sorry to take so long. It has been quite sometime since a question was posted on the CNG part of this forum. Tough to answer your question based on the numbers you stated. You say your Landrover is 1960's. On petrol I would expect to see a base timing in the 5 to 10 degree range, mechanical timing a...
by C3H8
Thu Mar 05, 2020 1:00 pm
Forum: Propane Forum
Topic: Dual carbs with propane?
Replies: 25
Views: 4260

Re: Dual carbs with propane?

The Ford 300 CI engines were kind of unique with the dual intake system making this a difficult question to answer. The 300 CI Ford, a straight I6, is a fairly strong engine and had good torque. This engine had a longer stroke then most engines. Most engines today have bores and strokes quite simila...
by C3H8
Mon Mar 02, 2020 1:07 pm
Forum: Propane Forum
Topic: Dual carbs with propane?
Replies: 25
Views: 4260

Re: Dual carbs with propane?

Dual mixers with a single regulator are fine. Just make sure the hose length is the same from the "Y' or "T" fitting is the same. As for the "Y" or "T" fitting. A "Y" is preferred. If you can't find a "Y" usually available in brass you can use 45 degree cast iron fittings or 90 degree as cast iron f...
by C3H8
Fri Feb 21, 2020 2:04 pm
Forum: Propane Forum
Topic: What would it take to convert a Honda CT90 to propane?
Replies: 5
Views: 1954

Re: What would it take to convert a Honda CT90 to propane?

Regulator would be something like a Beam model T60. This regulator would require vapour as a fuel supply. It can do liquid but obviously not on an air cooled engine. To do liquid there are other options like the Century G85 which can be heated by mounting it near an exhaust pipe. Vapour withdrawal i...
by C3H8
Fri Feb 21, 2020 2:00 pm
Forum: Propane Forum
Topic: What would it take to convert a Honda CT90 to propane?
Replies: 5
Views: 1954

Re: What would it take to convert a Honda CT90 to propane?

Thanks Frank. I thought he was just referring to a model of Honda engine. As you stated a 20# would not be the proper tank for a motorcycle. I don't know if they still have them but countries in Europe used to make tanks for motorcycles that were half LPG half petrol. The outside of the tank was mad...
by C3H8
Tue Feb 11, 2020 1:56 pm
Forum: Propane Forum
Topic: What would it take to convert a Honda CT90 to propane?
Replies: 5
Views: 1954

Re: What would it take to convert a Honda CT90 to propane?

There are mixers for very small engines. You don't say what this is used for but the Honda CT is only 7HP so I presume it is a generator or similar application. You don't say where you are but in the USA there are at least 2 or 3 companies that probably have a venturii style mixer for that engine. T...
by C3H8
Wed Jan 29, 2020 1:40 am
Forum: Propane Forum
Topic: Status on High Performance 4-barrel Carbs
Replies: 13
Views: 1808

Re: Status on High Performance 4-barrel Carbs

There are two ways supplied by IMPCO for CFM calculations. The calculation storm supplied or a chart that IMPCO made up to forgo the calculation. According to the chart storms formula pretty well matches the chart. IMPCO does suggest rounding up the CI for over the road vehicles. In this case the ch...