« previous next »
Pages: 1 2 [3]

Author Topic: running thicker fuel advances timing?  (Read 7329 times)

Reply #30November 25, 2009, 09:59:29 am

dennis

  • Veteran
  • Offline
  • ***
  • 311
Re: running thicker fuel advances timing?
« Reply #30 on: November 25, 2009, 09:59:29 am »
Gonna lower the pressure on my Volvo this weekend. Gave that pin a smack already, and have had remorse every since.
Logged
1980 Caddy TD (Always in progress)
1983 Volvo 245 D24 NA Building D24T
1980 Air-cooled Westy
1956 F100 (What to do???))
Reply #31November 25, 2009, 12:11:41 pm

dennis

  • Veteran
  • Offline
  • ***
  • 311
Re: running thicker fuel advances timing?
« Reply #31 on: November 25, 2009, 12:11:41 pm »
No kidding, and I do this for a living too. But.. I have milked a couple of past Rabbits into running smoother, while reducing white smoke. At the end of the day internal pressure problems usually indicate a worn pump. As far as measuring pressure while adjusting, it is difficult to calibrate a hammer blow to a punch. Just need to modify a socket to git that valve out and get out the ole hammer, and punch and go the other way. Wonder why Bosch didn't put a screw there instead of that pin. 
Logged
1980 Caddy TD (Always in progress)
1983 Volvo 245 D24 NA Building D24T
1980 Air-cooled Westy
1956 F100 (What to do???))
Reply #32November 25, 2009, 12:59:33 pm

Vincent Waldon

  • Global Moderator
  • Veteran
  • Offline
  • ***
  • 3255
    • My collection of HOWTOs
Re: running thicker fuel advances timing?
« Reply #32 on: November 25, 2009, 12:59:33 pm »
Quote from: dennis on November 25, 2009, 12:11:41 pm
Wonder why Bosch didn't put a screw there instead of that pin. 

My guess... same reason the fuel screw has a steel collar welded to it... "if you have to ask, don't touch".  ;-)

There *is* a Bosch-specific tool that attaches to the top of the pump and allows you to gradually increase the internal pressure upwards... unfortunately it remains a one-way adjustment however.
Logged
Vince

Edmonton, Alberta, Canada
2001 silver TDI Jetta Malone Stage 1.5 , 2001 blue TDI Jetta SBIII 216s Malone Stage 3, 1970 Bay Window bus

Gone but not forgotten: 1969/1971 Beetles, 1969/1974 Westies, 1979 Rabbit, 1986 TD Jetta, 1992 gas Jetta, 1994 TD Jetta
Reply #33November 25, 2009, 02:23:12 pm

dennis

  • Veteran
  • Offline
  • ***
  • 311
Re: running thicker fuel advances timing?
« Reply #33 on: November 25, 2009, 02:23:12 pm »
Yeah, I know but I must touch it. Got lots of part to put on the Caddy this week end. Im gonna outright molest the pump on it
« Last Edit: November 25, 2009, 02:40:16 pm by dennis »
Logged
1980 Caddy TD (Always in progress)
1983 Volvo 245 D24 NA Building D24T
1980 Air-cooled Westy
1956 F100 (What to do???))
Reply #34November 29, 2009, 05:44:32 am

vwjones

  • Junior
  • Offline
  • **
  • 80
Re: running thicker fuel advances timing?
« Reply #34 on: November 29, 2009, 05:44:32 am »
hi rabbit,

I run a two tank system on my 1.6.  one has diesel and the other has a mixture of 4/5 used motor oil, 1/5 kerosene or diesel, one ounce acetone per 5 gal fuel, one ounce seafoam per 5 gal to prevent carbonization, and filter it down to one micron.  I start it up and get it up to temp on the diesel, then switch over to the used oil by turning two 3 way valves in the cockpit.  the oil is routed through a flatplate fuel heater that I got off ebay for about 74 bucks.  If I don't wait for the engine to get up to temp, it doesn't run worth a *** on the oil.  I suppose it is somehow related to the thickness of the fuel as well since the flatplate heater thins it out alot. Might be worth a try for you.  BTW.  when I switch it over on the highway, speed increases when the mixture hits the engine even though i don't change the accelerator position.  It sounds a lot quieter too.  I switch back to diesel before I shut it down too.  I've ran about 6k on this mixture so far with zero problems.  I only need to buy a tank of diesel about every 3 thousand miles  ;D
Logged
Pages: 1 2 [3]
« previous next »