Search found 796 matches

by storm
Tue Jul 06, 2021 7:28 pm
Forum: Propane Forum
Topic: drilling LPG injector bigger, but loosing power
Replies: 25
Views: 10278

Re: drilling LPG injector bigger, but loosing power

Resistance of plug leads.
Coil output (pull the lead off each coil 1 at a time during the misfire to see what coils are not firing enough).
General integrity of wiring.
by storm
Tue Jul 06, 2021 2:43 am
Forum: Propane Forum
Topic: drilling LPG injector bigger, but loosing power
Replies: 25
Views: 10278

Re: drilling LPG injector bigger, but loosing power

kikkegek wrote:
Tue Jul 06, 2021 2:24 am
we seem to meet everywhere ;-) ...doesnt help to meet you under different aliasses :lol:
lolololol. I've been a member of HPA for years, started out as Storm but someone asked me to use my real name so I changed it to Michael AU.

If your plugs are ok check the rest of your ignition system.
by storm
Tue Jul 06, 2021 12:21 am
Forum: Propane Forum
Topic: drilling LPG injector bigger, but loosing power
Replies: 25
Views: 10278

Re: drilling LPG injector bigger, but loosing power

Looking at the screenshot of your datalog I see an event in graph 1 that appears to preceed (albeit momentarily) corresponding events in the other graphs. Graph 1 the yellow line drops dramatically momentarily before the lean spike in graph 5. You also have a rise in MAP (red line in graph 1) at the...
by storm
Mon Jul 05, 2021 10:01 pm
Forum: Propane Forum
Topic: drilling LPG injector bigger, but loosing power
Replies: 25
Views: 10278

Re: drilling LPG injector bigger, but loosing power

from all I have read that is not quit true. LPG is a gaseous fuel and has no benefit for rich mixtures under WOT. liquid fuels like gasoline will get a cooling benefit from running rich mixtures, while with gaseous fuels anything more then stooich just adds heat and not power. source: check out 5th...
by storm
Mon Jul 05, 2021 5:14 pm
Forum: Propane Forum
Topic: drilling LPG injector bigger, but loosing power
Replies: 25
Views: 10278

Re: drilling LPG injector bigger, but loosing power

14.5 and 15 is rich...remember LPG is 15.5 stoich....16 and beyond is leaner....below 15.5 is richer ;-) Not at WOT it isn't. WOT needs approx 0.90 Lambda which is about 14 AFR. slowly increasing free revving its fine. Under load is where it will go lean above 30-50% TPS Edited my post above, I thi...
by storm
Mon Jul 05, 2021 5:05 pm
Forum: Propane Forum
Topic: drilling LPG injector bigger, but loosing power
Replies: 25
Views: 10278

Re: drilling LPG injector bigger, but loosing power

14.5 - 15.0 Ok it was leaning out. it runs fine below 30-50% TPS. But when I slowly increase the throttle Is this slowly increasing free reving or slowly increasing under load? see this log: Valtek 30 BFC drilled to 3mm - max lean aboven 30pTPS.png Spiking!!! before you do anything else pull your p...
by storm
Mon Jul 05, 2021 4:10 pm
Forum: Propane Forum
Topic: drilling LPG injector bigger, but loosing power
Replies: 25
Views: 10278

Re: drilling LPG injector bigger, but loosing power

If your duty cycle was 105-110% WOT @ 4500 rpm with a 2.65mm orifice your settings were out to begin with. It isn't uncommon to see 101 or 102% but any higher indicates an incorrect setting. Before you drilled them out to 3mm what was the AFR reading at WOT @ 4500 rpm? It is possible, because in eff...
by storm
Mon Jul 05, 2021 4:52 am
Forum: Propane Forum
Topic: drilling LPG injector bigger, but loosing power
Replies: 25
Views: 10278

Re: drilling LPG injector bigger, but loosing power

They were 2.65mm and I opened them up to 3mm. It didnt fix it. I changed nothing after reinstalling, started my engine and thought I noticed the wideband correcting and adding fuel. At first I thought could be low pressure in my LPG tank, but then took it for a spin and it wont pull over 30-50% TPS...
by storm
Thu Jun 17, 2021 5:26 am
Forum: Propane Forum
Topic: Timing gear considerations on 1978 Ford 460
Replies: 42
Views: 14163

Re: Timing gear considerations on 1978 Ford 460

"Cam timing" is often spoken about as though there is some dark secret cam grinders and oem manufacturers have deliberately hidden from everyone. The specs written on a cam card are there simply so the installer can verify the grind is what is advertised. Where the cam is actually installed is, and ...
by storm
Thu Jun 10, 2021 4:09 am
Forum: Propane Forum
Topic: Timing gear considerations on 1978 Ford 460
Replies: 42
Views: 14163

Re: Timing gear considerations on 1978 Ford 460

Over the last few years I have learned that each engine is different. That is why I now say give each engine what it wants and can cope with. The 460 is a decent engine, not as good as the earlier 427-428 but still a good engine in its own right. They weren't designed for mid to high rpm performance...
by storm
Tue Jun 08, 2021 3:26 pm
Forum: Propane Forum
Topic: Timing gear considerations on 1978 Ford 460
Replies: 42
Views: 14163

Re: Timing gear considerations on 1978 Ford 460

I know what you mean about road tuning. I used to live, actually I do at my new place as well, on bad roads where timing for trap speed is very difficult. In your case it is either a trip to the dyno or trial and error over a period of weeks everytime you go out in it. As for VA timing I suggest you...
by storm
Tue Jun 08, 2021 3:11 am
Forum: Propane Forum
Topic: Timing gear considerations on 1978 Ford 460
Replies: 42
Views: 14163

Re: Timing gear considerations on 1978 Ford 460

Ok let's clarify a couple of terms here so we are all on the same page with regards to what is happening. Base timing = timing setting that allows the engine to start easily. Idle timing = timing setting that enables the engine to idle efficiently. Timing curve = timing settings at different loads a...
by storm
Wed Jun 02, 2021 4:14 pm
Forum: Propane Forum
Topic: Timing gear considerations on 1978 Ford 460
Replies: 42
Views: 14163

Re: Timing gear considerations on 1978 Ford 460

There is no easy way to say this, again I know because I made the same mistake (it was even in a discussion on this forum), DON'T confuse cam degrees with timing (crank) degrees. If you swap the cam gear you are STILL timing by the crank and shouldn't change the way you set timing. Sure set it at a ...
by storm
Wed Jun 02, 2021 3:17 am
Forum: Propane Forum
Topic: Timing gear considerations on 1978 Ford 460
Replies: 42
Views: 14163

Re: Timing gear considerations on 1978 Ford 460

I know it's sometimes difficult, because I have done it myself, but don't confuse cam timing and ignition (crank) timing. I, personally, would keep the standard timing specs for the engine (year and specification) and then adjust it over time for best vacuum at idle and best economy at cruise speed....
by storm
Mon May 10, 2021 3:37 pm
Forum: Propane Forum
Topic: LPG injection, AFR goes pisrich on first cold start
Replies: 11
Views: 5523

Re: LPG injection, AFR goes pisrich on first cold start

Sounds good, I'm just trying to figure out how you got to the point you are at now. It seems to me there are 2 possibilities causing this issue. 1 is mechanical the other is a setting. You may be getting, and I think this is highly unlikely, highly condensed fuel coming through at start up/warm up. ...