Vaporate Gizmo
Submitted: Sunday, May 22, 2005 at 12:10
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Sand Man (SA)
OK, who is going to volunteer to be the first Forumite to
test the new fuel saving system (Vaporite) to be released by Repco tomorrow morning?
The newspaper blurg indicates suitability for 4WD's (especially) with a fuel saving of 15% - 20%.
With a cost of $289 (plus installation) it promises a quick pay back of about 4-5 weeks by my estimation.
MAN, its gunna be the best invention since Zok invented the wheel. (or was it Zog)
I'll let someone else do the testing first though:-)
Reply By: old-plodder - Monday, May 23, 2005 at 08:02
Monday, May 23, 2005 at 08:02
Silly question I know, but if it works on heating the fuel, why don't people who drive from Victoria in winter to
Darwin notice such a drop in fuel consumption?
Any one from Victoria noticed such an decrease?
Maybe this is why it can't be used on a hard working vehicle, high temps already.
It can't heat the fuel too high, otherwise vaporisation will occur on the fuel line, remember the old fuel lock on some vehicles!
Of course, I could always put the gas stove under the fuel tank and warm the fuel that way each morning. It certainly would be interesting to see if it works :-).
Any one offering to try?
AnswerID:
112390
Follow Up By: Nudenut - Monday, May 23, 2005 at 08:35
Monday, May 23, 2005 at 08:35
"It can't heat the fuel too high, otherwise vaporisation will occur on the fuel line"...may not be correct Old-plodder, as the fuel is under high pressure in the fuel line and pressure will or may prevent vapourisation..
however, and I agree with what he has to say about ...better vapourisation leads to greater efficiency...
then why do we have high pressure fuel pumps in our late model fuel injected vehicles....?to aid in vapourisation no doubt...and
surely there would be sufficient heat at the point of injection (once the vehicle is at correct operating temps) to aid in vapoursiation?
I reckon it will be as usefull as teets on a bull
FollowupID:
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Follow Up By: old-plodder - Monday, May 23, 2005 at 17:46
Monday, May 23, 2005 at 17:46
Thanks, wasn't sure fo the fuel line pressures. SAssumed they were reasonably low, as in under 20 psi, or 140kpa.
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Reply By: Member - Hugh (WA) - Tuesday, May 24, 2005 at 07:58
Tuesday, May 24, 2005 at 07:58
Hi Guys,
I am a senior design engineer in the fuel system industry - specifically fuel injector design. I have seen the advertsing blurb - not a lot of facts.
This concept is essentially a metal heat sink that is affixed to the injector tip, in order to transfer heat from the manifold to
the tip. Increased heat will supposedly improve vaporisation of the fuel.
The best time this would be effective would be at cold start. Unforunately the engine/manifold is also cold so no net effect. Siemens, Delphi, etc tried the use of electrically heated tips for cold start, then turned off when engine warm. Never made it to production. This may offer improvement for older fuel injectors with pencil stream sprays that rely on vaporisation from manifold/valve heat and air stream, but I would be suprised if it would benefit the later multi-hole fuel injectors which already have atomised spray in the 50-70um range.
Personally I am not a fan of heating the injector tip as this is the primary root cause leading to injector deposits. I note that there are no long term
test results showing performance in this regard.
Regards,
Hugh
AnswerID:
112538
Follow Up By: Member - Bradley- Wednesday, May 25, 2005 at 17:31
Wednesday, May 25, 2005 at 17:31
spot on hugh, on an old fire hose injector like a ZL fairlane it may have some slight tangible effect, but modern injectors are very good ( as you
well know) . My thinking is that as most systems chase lambda constantly, then if it effects the mixtures - ie less fuel mass being injected, then the ecu will just adjust the pulse width to re-gain it's given a/f value.
Just drive em in the torque band, not chugging under load and get the best results i say..
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Reply By: Niko - Tuesday, May 24, 2005 at 23:08
Tuesday, May 24, 2005 at 23:08
$289 is an expensive Fuel Injector collar! Does it come with diamonds? I remember whilst driving my RX7 with a Mildly ported, 48IDA webber carb, twin exhaust with dog and Lukey turbo muffler 13B Rotory motor would have a very notable increase in progressive power through the gears and little bit on overtaking when it was cold at night. On such nights wouldn't the vaportaor need to cook the fuel a lot more to get it to the right temperature, thus does it have the ability to sense the temperature of the fuel it has heated? If it is 45 degrees and the fuel is (or appears to be) already vaporised, then the vaporator would not be able to become as effective.
I think the guy with the most expensive 4WD drive should test it as he has the money..... ok whose going to own up to having a Lada?
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