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Old 03-08-2007, 02:05 PM
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Join Date: Jun 2006
Location: NY
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My tach reads at least 10% low.

Ron Schroeder
'85 300 Turbo Diesel 2 tank WVO
'83 300 Turbo Diesel 2 tank WVO
Some former WVO vehicles since ~1980:
'83 Mercedes 240D
'80 Audi 4000D
'83 ISUZU Pup
'70 SAAB 99 with Kubota diesel
'76 Honda Civic with Kubota diesel
'86 Golf
Several diesel generators
All with 2 tank WVO conversion
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Old 03-08-2007, 02:29 PM
vstech's Avatar
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,337
Originally Posted by WD8CDH View Post
My tach reads at least 10% low.
Mine's off a bit more...

John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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Old 03-09-2007, 10:39 AM
t walgamuth's Avatar
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 34,808
i vote for tach inaccuracy too.

tom w
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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Old 03-12-2007, 10:39 AM
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Join Date: Jun 2004
Location: Baxter, TN
Posts: 88
Mr. T

Just curious, why would you multiply the driveshaft rotations by 2?
Seems like the ratio would be driveshaft rotations to one wheel rotation.
2007 Mini Cooper 4K miles
1993 300E 2.8 120K miles
1961 Morris Minor 42K miles
1965 Morris Minor 23K miles
1997 Ford F150 235K miles
1987 Ramcharger 202K miles
1984 Chevy C-30 farm truck 88Kmiles
1968 XKE 59K miles
2001 Harley Softtail
2003 Harley Roadking
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Old 03-12-2007, 02:18 PM
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Join Date: Jul 2006
Location: North Texas
Posts: 305
It would if you had a locking or limited slip differential. In which case you'd have to lift both tires too.
With an open differential and one wheel on the ground the axle drives the spiders, which drive the ring at half speed... 'cause one tire is not moving. So to immitate both tires making 1 full rotation you have to rotate a single tire twice.
Not the world most elegant explanation, but I'm positive the two rotations thing is right.

I suggest we solve high gas prices with environmentalists... unfortunately they don't burn well.
1982 300CD, 220K miles: This vacuum system will be the death of me yet! (OBK #26)
1977 F150 400 C6 2wd, 10.2 sec 1/8 mile with 2.75 gears.
1965 Mustang. Mostly stock... LOL!
2001 Ram 2500, cummins, 5spd, 202k miles.(girlfriends)
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