Yes, when I first posted the question, the BBS appeared to crash, then I wanted to change the fixed 18 v to up to 18 volts, oh well!
I was checking out this a week or so ago:
http://www.freepatentsonline.com/6556778.html
Thus the questions!
In any case thanks for the explanation!
John
Isn't there some kind of a controller out there that could fix the voltage at 18v and control DC pump power by increasing or decreasing the current?
John
Could a fixed voltage of 18v be used and then some kind of a control system be used to control pump speed/torque by limiting current?
This way 3 pumps could be used without overtaxing the existing wiring, connectors etc?
Thanks all!
John
es it is interesting.........I didn't know anything about it and only quoted the paragraphs because I assumed they knew what they were talking about. Grrrrr!
Actually this is in regards to a *returnless* fuel system......there is no old style regulator that returns excess fuel to the...
Hi Operahouse,
I once stayed at the Hilton Hanoi Opera hotel, right next door to the operahouse.....same one? [smile]
Anyway, 12A was used only as an example......I have no idea what it actually is.
I did have a returnless system in mind when I asked the questions.........I was trying to...
Ok, then at the same load would the power dissipated (heat) in the pump at 12/12 and 18/8 be approximately the same or is there anything else going on here?
Thanks Scotty!
John
A hypothectical DC fuel pump is rated at 12volts/12amps and of sufficient power to maintain 39psi fuel rail pressure? The same pump is also safe to operate at 18volts.
With some kind of a controller (PWM?), could the pump then be run at 18volts/8amps and and still have enough power to maintain...
Ah, ha...so that may be one very important reason to specify a tire of extra load capacity! Cool!
Hmmm.......OTOH, if there is room/no rules for the largest load capacity tire possible......could there be a case of diminishing returns if too large a tire were fitted as it relates to turning...
Alright....that is interesting.........it also opens up a much larger selection for my GT500 if I choose to ignore the stock OEM tire spec of 1709@44psi (255/45ZR18).
Thanks!
John
Hi Norm,
I would imagine that the increased front end weight of a SVT Cobra, as opposed to a GT.....DOHC heads, supercharger, intercoolers, pumps, hose assemblies etc. warrants the increased load capacity of the 275/40ZR 18.
So bottom line, I assume that you agree with his choice of front...
After reading the contents of thread68-161928, I checked out the specs of a wheel/tire swap and am slightly concerned about the safety of the tire choice of a fellow forum member for street and occasional track day use.
The spec OEM front tire:
275/40ZR 17 - 98Y - Max Load 1653@44psi...
Note that the LS7 and the 4.6/5.4 Modular motors have moved their adjacent firing cylinders to the front of the blocks.
1-8-7-2-6-5-4-3 - LS7
1-3-7-2-6-5-4-8 - 4.6/5.4
Coincidence?
John
With a single-plane or common plenum intake #5 will rob #7, aggravated by #7 running hot unless the 4/7 swap is employed. Adjacent firing cylinders are very difficult to jet properly...if #7 is just right the rest of the cylinders will be too fat; if the other cylinders are just right #7 will be...
Actually, with the 4/7 swap, the average temps of the 4/2 cylinders are always cooler than the 5/7 cylinders.
I would suggest you stop suggesting and start measuring!
Regards
Historically, maintaining the correct A/F ratio of the 5/7 adjacent firing clyinders has been a problem because of their location in the firing order and as it relates to cylinder cooling or the lack thereof.
The 4/7 swap simply moves the adjacent firing cylinders to the front of the engine...
