Search found 1482 matches

by Steptoe
Thu Dec 28, 2017 5:42 pm
Forum: Messages
Topic: Forum Logo
Replies: 10
Views: 3718

Re: Forum Logo

Like it
not only that
and colour/ designs match the subject, something many over look.
10 out of 10
by Steptoe
Wed Nov 15, 2017 3:38 pm
Forum: Propane Forum
Topic: mounting a IMPCO relocation arm
Replies: 4
Views: 305

Re: mounting a IMPCO relocation arm

Did you use the mounting holes that are on these adapters for extra support? A must.. a scrape bit 4mmx 15mm bar, bent and couple holes drilled each end.. one end mounts on a convenient point on the mixer extension.. mounting point or section joining nut/ bolt, down to a convenient exhaust, or powe...
by Steptoe
Wed Aug 30, 2017 4:06 pm
Forum: Propane Forum
Topic: Max 32° mech. adv. for low cr engine: confirmed
Replies: 11
Views: 768

Re: Max 32° mech. adv. for low cr engine: confirmed

Fun thing to notice was, that it liked timing to be pulled back from 32° to 30°, from 3000 to 4000rpm This is where the cam starts to work.. higher rpms and the overlap/ duration and cylinder pressure tend to increase a few lbs at this point. The dyno has AFR and knock readings etc? Dyno guys tend ...
by Steptoe
Sun Jun 18, 2017 7:33 pm
Forum: Propane Forum
Topic: AFR numbers on dual fuel setup/300A tuning tip?
Replies: 42
Views: 2515

Re: AFR numbers on dual fuel setup/300A tuning tip?

I have been messing with LPG, classic, vintage compressions, re designing old engines, compressions , custom cam designes to run on modern fuels since the early 70s. All I can say it I get damn good results.... for the last 30 odd yrs, and with technology and data loggers etc becoming affordable in ...
by Steptoe
Fri Jun 16, 2017 6:41 pm
Forum: Propane Forum
Topic: AFR numbers on dual fuel setup/300A tuning tip?
Replies: 42
Views: 2515

Re: AFR numbers on dual fuel setup/300A tuning tip?

Dont believe everything about electric fans.. If going to replace a fixed fan.. yes.. If a clutch fan.. no.. forget the marketing propaganda to sell electric fans (like the 'flexi fan bs) .. . there is no load on a clutch fan when it is not needed.. this is one of those old wives tails.. like HEI wa...
by Steptoe
Thu Jun 15, 2017 5:41 pm
Forum: Propane Forum
Topic: AFR numbers on dual fuel setup/300A tuning tip?
Replies: 42
Views: 2515

Re: AFR numbers on dual fuel setup/300A tuning tip?

Eventhough, after everything I've done to my car, I still can't produce any MPG's to be proud off, as I'm currently only netting around 12mpg. Im between 15 and 16 mpg Also musty go right back to basics.. The amount of mixture used per mile is directly related to the volume moved by the engine per ...
by Steptoe
Wed Jun 14, 2017 4:53 pm
Forum: Propane Forum
Topic: AFR numbers on dual fuel setup/300A tuning tip?
Replies: 42
Views: 2515

Re: AFR numbers on dual fuel setup/300A tuning tip?

Changing timing AND AFRs makes a huge difference in economy and power. Simply changing one or the other may only be slight, depending how far the other is out. Any timing change.. be it at idle or in the rpm range will require a a change in mixture....unless the timing is over advanced... and visa v...
by Steptoe
Wed Jun 07, 2017 4:47 pm
Forum: Propane Forum
Topic: AFR numbers on dual fuel setup/300A tuning tip?
Replies: 42
Views: 2515

Re: AFR numbers on dual fuel setup/300A tuning tip?

Forget trying to relate petrol tuning (any specs) specs to and other fuel... doesnt work. I mention dial in.. this is what you have to do...Dial in means establishing the best tuning specs (as one gets the tuning specs in the manual) idle rpms... that is best stable idle at good afr..."best " means ...
by Steptoe
Tue Jun 06, 2017 8:51 pm
Forum: Propane Forum
Topic: AFR numbers on dual fuel setup/300A tuning tip?
Replies: 42
Views: 2515

Re: AFR numbers on dual fuel setup/300A tuning tip?

Billhilly I hope I'm not coming across as harsh but there is a lot on the internet and much of it is generic or wrong. I will also add.. most old school pre dizzy mechanics didnt/dont even understand timing and the background behind it.. Damn near ALL modern mechanics.. or 'technicians' who only kn...
by Steptoe
Tue Jun 06, 2017 4:56 pm
Forum: Propane Forum
Topic: AFR numbers on dual fuel setup/300A tuning tip?
Replies: 42
Views: 2515

Re: AFR numbers on dual fuel setup/300A tuning tip?

Little to ad to storms I take a slightly different approach in setting up timing.. both end up achieving same results...method in older posts Few things you need to understand. 1/ Never dial in timing increasing advance...as advance increases the tone changes, sounds better..this is sort of like a o...
by Steptoe
Mon Jun 05, 2017 4:39 pm
Forum: Propane Forum
Topic: AFR numbers on dual fuel setup/300A tuning tip?
Replies: 42
Views: 2515

Re: AFR numbers on dual fuel setup/300A tuning tip?

Thats what I run at.. or very close. There is far more than just getting the O2 right, you need to combine that with the timing curve. The timing curve will vary due to load on the engine.. ie final gear ratios, weight of the vehicle and if running EGR or nor Also Vacuum advance at idle (enables low...
by Steptoe
Wed May 24, 2017 1:27 am
Forum: Propane Forum
Topic: Q-Jet Throttlebody & 425
Replies: 8
Views: 822

Re: Q-Jet Throttlebody & 425

Mine is a dual plane.... no issues right out to leaning out high 4K / low 5K rpms sb 355 chev... which is around where it should be.. if anything a little lower.
by Steptoe
Mon May 22, 2017 5:13 pm
Forum: Propane Forum
Topic: Q-Jet Throttlebody & 425
Replies: 8
Views: 822

Re: Q-Jet Throttlebody & 425

I have been running a Q jet base plate for over 30 yrs very successfully...over 200,000 miles ago From memory... 1/ have a spread bore to square bore adaptor, milled off a few mm to clear the hood 2/ the butterfly return spring ,added a spring between the levers on the opposite of the throttle. 3/ a...
by Steptoe
Sun Dec 18, 2016 11:20 pm
Forum: Propane Forum
Topic: Randomly losing power @ WOT
Replies: 13
Views: 1158

Re: Randomly losing power @ WOT

I chased something like this around for a long time ... with a sudden lean out in AFR randomly, useually going up a hill constant speed or acceleration at cruising speed. often mild acceleration just getting up to full highway speed. turned out t be a most minute burr on the main piston inside the 4...
by Steptoe
Wed Oct 14, 2015 6:56 pm
Forum: Propane Forum
Topic: EGR and propane
Replies: 7
Views: 1322

Re: EGR and propane

EGRs are not designed to vaporise fuel OK may have explained incorrect.. the egr exhaust 'tunnel' under the inlet causes heating of the of the charge.. not directly EGR function but certainly part of it and results in heating of the charge. So with lpg .. these tunnels need to be closed off regardl...