Search found 299 matches

by Pinger
Thu May 06, 2021 12:23 pm
Forum: General Discussion
Topic: It'll be under 1300cc, yet which car does a 17YO convert to LPG?
Replies: 33
Views: 1001

Re: It'll be under 1300cc, yet which car does a 17YO convert to LPG?

My lad's pretty realistic, it'll be throwaway motoring. And instilled from his father, he has the confidence not to bother too much with accepted norms, he won't give a sh*t. If he can insure it, he sees himself knocking around in a beige Volvo 940. More because at 17YO, a great barge is kinda' dif...
by Pinger
Thu May 06, 2021 12:22 pm
Forum: General Discussion
Topic: It'll be under 1300cc, yet which car does a 17YO convert to LPG?
Replies: 33
Views: 1001

Re: It'll be under 1300cc, yet which car does a 17YO convert to LPG?

Servicing costs are higher on a modern diesel and if it breaks down then you are into serious money. Seems that for diesel to be viable you need to do at least 25,000 a year of mostly motorway miles, see https://www.parkers.co.uk/car-advice/should-you-buy-diesel-or-petrol-car/ I fear diesels more t...
by Pinger
Wed May 05, 2021 12:36 pm
Forum: General Discussion
Topic: It'll be under 1300cc, yet which car does a 17YO convert to LPG?
Replies: 33
Views: 1001

Re: It'll be under 1300cc, yet which car does a 17YO convert to LPG?

Agreed, one boring pre-2005 Toyota, Nissan K11 etc. And it won't need to be too pretty, or that reliable. As long as it runs... and can be patched until we prang it. But which? It's tricky with so much of the budget allocated to insurance. Maybe worth making a decision whether it has to pass anothe...
by Pinger
Tue May 04, 2021 5:49 pm
Forum: General Discussion
Topic: It'll be under 1300cc, yet which car does a 17YO convert to LPG?
Replies: 33
Views: 1001

Re: It'll be under 1300cc, yet which car does a 17YO convert to LPG?

Re. option 3 is if there's similar chance of a 17 year old crashing a car or crashing a bike, rather they crash the car..? Yes. But realising it is limbs not bumpers that take the hit - maybe some accidents become avoidable. Main virtue of two over four wheels for a 17 year old is vastly cheaper in...
by Pinger
Tue May 04, 2021 12:01 pm
Forum: General Discussion
Topic: It'll be under 1300cc, yet which car does a 17YO convert to LPG?
Replies: 33
Views: 1001

Re: It'll be under 1300cc, yet which car does a 17YO convert to LPG?

With two big problems - insurance cost and finding a good example of anything at a decent price - why complicate it further with a fuel conversion? I've seen this question raised on more heavily populated forums and the options invariably are the small hatch that doesn't attract the big premiums and...
by Pinger
Mon Apr 26, 2021 2:08 pm
Forum: General Discussion
Topic: Timing advance processor
Replies: 57
Views: 1873

Re: Timing advance processor

That's a good point on part throttle vs wide open. You think some of the gains might only be seen at part throttle in same rev range? I could even set up some sort of a temporary stop underneath throttle for the tests so I don't vary from that position. Bit scared to rev the thing out to 6000 thoug...
by Pinger
Mon Apr 26, 2021 12:41 pm
Forum: General Discussion
Topic: Timing advance processor
Replies: 57
Views: 1873

Re: Timing advance processor

Being the nerd that I am I had to check the thermal expansion data on liquid lpg. It's listed as 0.003/k, or thereabouts depending on temp. Say a 10° difference (0.03 factor) with my 68 usable litre tank gives 1.95l. I just found a document online that has that kind of data - buried somewhere in it...
by Pinger
Mon Apr 26, 2021 12:21 pm
Forum: General Discussion
Topic: Timing advance processor
Replies: 57
Views: 1873

Re: Timing advance processor

What might be help in ascertaining if your TAP is helping you is acceleration runs over a speed/rpm range at different throttle openings. You'd need an accurate TPS signal (a multi meter wired to its output would do) for the different throttle openings. Then, on the same stretch of road on the same ...
by Pinger
Mon Apr 26, 2021 11:30 am
Forum: General Discussion
Topic: Timing advance processor
Replies: 57
Views: 1873

Re: Timing advance processor

But the fuel pump cut off is from the float attached to fill valve rather than pressure, so therefore temperature difference would only affect the density of the lpg rather than the level at which the pump stops filling (assuming angle of the car is the same etc) Good point. Unless, that is the fin...
by Pinger
Mon Apr 26, 2021 10:45 am
Forum: General Discussion
Topic: Timing advance processor
Replies: 57
Views: 1873

Re: Timing advance processor

If my understanding and ability to explain is up to the task.... it's the vapour within the tank that needs to be compressed by the incoming liquid fuel for there to be room for the liquid. When the vapour is warm it resists compression (due to the higher (when warm) vapour pressure) and when the su...
by Pinger
Mon Apr 26, 2021 9:48 am
Forum: General Discussion
Topic: Timing advance processor
Replies: 57
Views: 1873

Re: Timing advance processor

Well, just filled up to check consumption and it was at 16.4l/100km and wasn't flogging the car at all, so it's up 2l/100 from 2 fills ago at 0 extra advance. Assuming the tank fills to the same level each fill and liquid gas density(temp) is the same on each fill.. Beat me to it. Fill quantity is ...
by Pinger
Sun Apr 25, 2021 12:08 pm
Forum: General Discussion
Topic: Timing advance processor
Replies: 57
Views: 1873

Re: Timing advance processor

On the mixture thing, where my thinking is sitting is that feedback from oxygen sensor could be affecting fuel trims (that is it's job in the end) changing the mixture..... .if things are different leaving the exhaust while using the TAP. If the advanced timing is beneficial then the emerging exhau...
by Pinger
Sun Apr 25, 2021 11:09 am
Forum: General Discussion
Topic: Timing advance processor
Replies: 57
Views: 1873

Re: Timing advance processor

I watched that video on lean of peak in aircraft. Found it very interesting. Obviously cruising in an aircraft is a different situation than car on the a road with varying roads, hills etc. Going with what Pinger mentions about the Chevrolet forum guy is pursuing, I know on the TAP that I've got yo...
by Pinger
Sun Apr 25, 2021 11:04 am
Forum: General Discussion
Topic: Timing advance processor
Replies: 57
Views: 1873

Re: Timing advance processor

With what you say above about lean mixtures and advanced timing, that would be advancing the timing in response to a lean mixture I'm gathering. What effect would you expect advancing timing to have on mixtures (as in other way around)? That's the part I'm trying to figure out. More complete combus...
by Pinger
Sun Apr 25, 2021 10:54 am
Forum: General Discussion
Topic: Timing advance processor
Replies: 57
Views: 1873

Re: Timing advance processor

On mixture and detonation, from reading I've done I was under the impression that rich avoids detonation due to the heat absorbed through vaporisation of the fuel, which would then only occur with liquid fuel (or droplets of liquid with injected). Are you just transferring knowledge of petrol opera...
by Pinger
Tue Apr 20, 2021 10:46 am
Forum: Having Problems ?
Topic: VSR prevention tips.
Replies: 26
Views: 1696

Re: VSR prevention tips.

On the valve seat issue, I've been doing a bit if reading based on the engine I put in the pajero, which was out of a Magna (Australia family type car). These came out with petrol, dual fuel or lpg only. Apparently the intake valves and seats are the same between all engines/heads, but in the log o...
by Pinger
Fri Apr 16, 2021 10:41 am
Forum: General Discussion
Topic: Timing advance processor
Replies: 57
Views: 1873

Re: Timing advance processor

I like the theory of measuring EGT to set ignition timing, not sure if it will work but would be interesting to see how such tests go. Slightly different subject but I know some piston engine'd aircraft pilots set mixture using EGT. They may all watch EGT to make sure the temp isn't too high but so...
by Pinger
Fri Apr 16, 2021 10:27 am
Forum: General Discussion
Topic: Timing advance processor
Replies: 57
Views: 1873

Re: Timing advance processor

EGT is another really good point also, and not sure if I have come across anyone discussing monitoring that for optimising timing. That also lines up with things that I mentioned in another thread, where the Russians kept mentioning advancing the timing to save exhaust valves, as apparently the lpg...
by Pinger
Thu Apr 15, 2021 9:12 pm
Forum: General Discussion
Topic: Engineering company suggestions for hard valves/seats
Replies: 56
Views: 4535

Re: Engineering company suggestions for hard valves/seats

Just to update and finish off this thread. The range rover is back up and running. All valves and seats had some wear and pitting, so all where replaced, the seats with Lpg compatible ones, which arnt just harder, but are sintered with materials that lubricate, and stop the valve and seat micro wel...
by Pinger
Thu Apr 15, 2021 7:00 pm
Forum: General Discussion
Topic: Timing advance processor
Replies: 57
Views: 1873

Re: Timing advance processor

We broadly agree mate but I would repeat that some engines with hydraulically controlled VVT do compare cam position sensor pulses to crank position sensor pulses to know how far cam timing is advanced/retarded. Might have an electrically controlled hydraulic master solenoid that feeds oil to a rem...