Search found 4053 matches

by LPGC
Mon Jan 18, 2021 9:56 pm
Forum: General Discussion
Topic: high pressure during cut off
Replies: 45
Views: 1648

Re: high pressure during cut off

I guess lets assume the worst fuel trim I have on petrol in terms of LTFT is 10%, maybe 15%. Then I would of assumed that the lpg injectors would simply copy the petrol ones. But when I do run LPG it shoots off past 20. For idle anyways. Currently am interested in just making idle work well and I a...
by LPGC
Sun Jan 17, 2021 6:46 pm
Forum: General Discussion
Topic: high pressure during cut off
Replies: 45
Views: 1648

Re: high pressure during cut off

It will generate an error pointing to trims being lean/rich if trims are at an extreme even if mixture/lambda are OK. You could be looking at command lambda (the mixture it's aiming for) instead of looking at lambda readings but I doubt it if you're looking at equivalence ratio for both banks, there...
by LPGC
Sun Jan 17, 2021 6:13 pm
Forum: General Discussion
Topic: high pressure during cut off
Replies: 45
Views: 1648

Re: high pressure during cut off

I see nothing really telling in the screenshots of ltft's, it might be more telling to see a vid of a code reader showing live data including ltft and stft for both banks under various conditions as you drive the car. Would also be helpful if lambda equivalence ratio readings for both banks were sho...
by LPGC
Sun Jan 17, 2021 5:39 pm
Forum: General Discussion
Topic: high pressure during cut off
Replies: 45
Views: 1648

Re: high pressure during cut off

Well that seems to rule out the fuel return as the problem. It could be wrong shim sizes. Are you implying the same kind of thing happens on petrol? Or what is wrong with running on petrol? What happens with bank 2 trims when bank 1 trims go high (question for both fuels)? On an engine with a single...
by LPGC
Sun Jan 17, 2021 5:13 pm
Forum: General Discussion
Topic: injector cleaner
Replies: 6
Views: 39

Re: injector cleaner

If this is the Grand Vitara(?) I thought you'd sorted the problem by reconnecting the pipe you found disconnected? https://www.lpgforum.co.uk/viewtopic.php?f=28&t=16607 If it now idles OK with good trims (and no high bank trim figure dialled in) I would expect a lumpy low speed running problem to be...
by LPGC
Sat Jan 16, 2021 5:39 pm
Forum: General Discussion
Topic: high pressure during cut off
Replies: 45
Views: 1648

Re: high pressure during cut off

Right at the top end of engine load it may switch to open loop and then fuel trim readings might be weird, in that case though you should check wide band lambda equivalence readings to make sure mixture is correct (suitably rich under high load open loop conditions). Another thing that can cause a s...
by LPGC
Thu Jan 14, 2021 10:13 pm
Forum: Running a V8 on LPG
Topic: Reducer recommendations
Replies: 14
Views: 198

Re: Reducer recommendations

Ultragas have used reducer designs made by various manufacturers over the years, including Tomasetto AT09 and KME The term 'AT09' may give the impression of a specific model of a Tomasetto manufactured reducer but there are many different model Tomasetto AT09's ranging from around 100bhp capacity to...
by LPGC
Thu Jan 14, 2021 7:23 pm
Forum: Running a V8 on LPG
Topic: Reducer recommendations
Replies: 14
Views: 198

Re: Reducer recommendations

It won't need a lot of pressure with the MJ's without nozzles, which means a lot of reducers would be suitable, just needs to be capable of flowing enough gas for the demands of the engine. If it's been working OK with the reducer type fitted you might as well buy another of the same type since pipi...
by LPGC
Thu Jan 14, 2021 6:55 pm
Forum: Running a V8 on LPG
Topic: Reducer recommendations
Replies: 14
Views: 198

Re: Reducer recommendations

Depends on what other components are fitted... Ecu and injectors ?
by LPGC
Wed Jan 13, 2021 1:24 am
Forum: Having Problems ?
Topic: running lean P0170
Replies: 10
Views: 308

Re: running lean P0170

On some engines having a pipe disconnected from a spud won't seem to cause much apparent problem when running on petrol, though the cylinder with the pipe off will see slightly leaner mixture than other cylinders which will see reduced efficiency running on petrol (of course with gas pipe off it won...
by LPGC
Sat Jan 09, 2021 5:42 pm
Forum: General Discussion
Topic: Engineering company suggestions for hard valves/seats
Replies: 54
Views: 701

Re: Engineering company suggestions for hard valves/seats

Very bad luck with it snapping and attempts to get it out so far, wish you better luck on your next attempt.
by LPGC
Sat Jan 09, 2021 12:16 am
Forum: General Discussion
Topic: Elgrand 51 series 2.5 and 3.5 for LPG
Replies: 9
Views: 141

Re: Elgrand 51 series 2.5 and 3.5 for LPG

david_1972 wrote:
Fri Jan 08, 2021 8:03 pm
Thank you Simon
I sent you a PM earlier.
by LPGC
Fri Jan 08, 2021 5:32 pm
Forum: General Discussion
Topic: Elgrand 51 series 2.5 and 3.5 for LPG
Replies: 9
Views: 141

Re: Elgrand 51 series 2.5 and 3.5 for LPG

Like Brian said, I've converted a lot of Elgrands to LPG and I run 2 Elgrands myself. The 2.5 and 3.5 in the E51 and the older 3.3 in the E50 are all equally well suited to running on LPG. Of course injector nozzle size, pressure and calibration settings are different for the different sized engines.
by LPGC
Wed Jan 06, 2021 1:54 pm
Forum: General Discussion
Topic: Engineering company suggestions for hard valves/seats
Replies: 54
Views: 701

Re: Engineering company suggestions for hard valves/seats

And if it's 16lbs at closed it will be less than 16lbs with the valve a few mm off it's seat..? The valve is also free to rotate so can be rotating a bit as it lands. There'll be all sorts of wear processes going on on either fuel, some to a lesser extent on LPG some to a greater extent. Metal to me...
by LPGC
Tue Jan 05, 2021 5:39 pm
Forum: General Discussion
Topic: Engineering company suggestions for hard valves/seats
Replies: 54
Views: 701

Re: Engineering company suggestions for hard valves/seats

Do supercharged engines run with higher inlet valve spring pressures (to help them close against boost pressure)? I seem to recall being told by a guy supercharging carbed Yamaha R1 engines (for Minis) that the limit of boost pressure was initially preventing the inlet valves from opening when not ...
by LPGC
Tue Jan 05, 2021 2:05 pm
Forum: General Discussion
Topic: Engineering company suggestions for hard valves/seats
Replies: 54
Views: 701

Re: Engineering company suggestions for hard valves/seats

Not related to this problem but the other owner's problem (other forum) mentioned above turned out to be just a melted coilpack.
by LPGC
Tue Jan 05, 2021 12:41 pm
Forum: General Discussion
Topic: Engineering company suggestions for hard valves/seats
Replies: 54
Views: 701

Re: Engineering company suggestions for hard valves/seats

This is the link referring to dropped seats https://www.jaguarforums.com/forum/xj-xj8-xjr-x308-27/slight-lifter-ticking-how-do-i-get-rid-89466/ Regarding comments of surprise that any VSR has occurred on inlet valves (vs exhaust) my understanding is that it is inlet valves that a lube system is ther...
by LPGC
Mon Jan 04, 2021 7:48 pm
Forum: General Discussion
Topic: Engineering company suggestions for hard valves/seats
Replies: 54
Views: 701

Re: Engineering company suggestions for hard valves/seats

Do you have a link to the forum thread with the US cars with the similar issues? My car hasn't overhead, or moved above the center mark in my ownership, and I have done about 20k miles in it, now just under 150k total. I am writing from a different laptop to the one I found the mention of dropped s...
by LPGC
Mon Jan 04, 2021 2:54 pm
Forum: General Discussion
Topic: Converter vacuum line
Replies: 1
Views: 76

Re: Converter vacuum line

You're talking about the difference between gas pressure being referenced to atmospheric pressure (no line to reducer) and gas pressure being referenced to manifold pressure (with line to reducer). The majority of systems have the line. Most injectors work best with a pressure difference between gas...
by LPGC
Mon Jan 04, 2021 1:41 pm
Forum: General Discussion
Topic: Engineering company suggestions for hard valves/seats
Replies: 54
Views: 701

Re: Engineering company suggestions for hard valves/seats

I started writing much the same as Gilbert has in post #17, just that it's difficult to imagine much going wrong with the bucket since they're not hydraulic. Out of interest I had a bit of a read on a few US forums regards your sort of problem on this engine, there's talk of possibility of an engine...