HiH/TiH vs HoH

For discussing the modifications needed for diesel vehicles to run with 2 tank veggie oil conversions.

Moderators: SunWizard, coachgeo

Postby Burbarian » Fri Apr 04, 2008 7:46 pm

Good empirical info, thanks.
1987 GMC Suburban 6.2L V8 IDI
1985 Merc 300TD
1968 CAT D4D 3304 dozer
1971 Waldon 4100 loader
1981 IHI 30F excavator
1995 Changfa 195 w/ ST 10kw genset
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Postby coachgeo » Fri Apr 04, 2008 7:59 pm

Burbarian wrote:Good empirical info, thanks.
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Postby SkySkiJason » Tue Apr 08, 2008 9:59 am

Not to beat the dead horse, but rubber is a poor conductor of heat and alum is a GREAT conductor. TIH is more efficient, just do the math. The pex is not a great conductor either - why bother? 3/8" alum is about $1/ft.
I gained 10* by insulating SOME of my HIH lines w/foam pipe insulation. :shock:

If you live in an environment where the VO will not be SOLID in the fuel lines when you start off in the AM - I'm sure HOH is fine as long as you can heat the oil enough in other ways.

I have about 30ft of HIH on my system, 25ft is 'looped return'. With this alone, I get 190* VO before the heads. 8)
2001 F-350, DRW, 4x4, XLT Crew Cab, flat bed, 7.3, 6 spd, Dipricol Optix gauges, DP tunes - Single-Shot injectors! Vegistroke-style WVO conversion, 55,000 VO miles so far - 190 deg VO before the heads
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Postby WD8CDH » Tue May 27, 2008 3:04 pm

When I started with Used Cooking Oil, the only thing available was solid even in the summer. I had to get my fuel with a shovel. HoH was fine in the summer but even insulated HoH was marginal in the winter when the lines were exposed under the car. Now I run Aluminum tube in Hose, VW oil cooler, spin on insulated fuel filter and FPHE on all of my conversions. I do not remove the fats from my fuel.

I rarely insulate my lines except for the parts under the hood.
Ron Schroeder
WD8CDH
'85 MB 300DT 2 Tank
Since '81 former WVO conversions:
'83 240D
'80 Audi 4000D
'83 Isuzu Pup
'86 Golf
'76 Honda Civic with Kubota engine
Prior to the cars, several generators
Kubota Tractor
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