Tach differences 1.6 vs 2.0

General topics.

Moderators: notoptoy, garth, S Allen

User avatar
nismou20
Roadsteraholic
Posts: 1246
Joined: Thu Jul 07, 2005 2:16 pm
Location: Pasadena, Ca

Tach differences 1.6 vs 2.0

Post by nismou20 » Wed Jun 12, 2019 1:30 pm

So I’m assuming that the left tach is a 1600 and right one is a 68 exclusive 2.0. The big number increments do not match the positions on face due to rear ended ratios 3.70 vs3.90. But did the 1.6 tach ever come without a 0 position pin stop? The face at 0 mile on left looks to never have had one. But it does rest where it is on left way below 0 mile mark. My original 2.0 doesn’t have a 0 stop pin either. Curious.
You do not have the required permissions to view the files attached to this post.

User avatar
SLOroadster
Roadsteraholic
Posts: 5302
Joined: Sun Dec 08, 2002 2:53 am
Location: Napa Ca

Re: Tach differences 1.6 vs 2.0

Post by SLOroadster » Wed Jun 12, 2019 2:20 pm

The white faced gauge is a repainted 2L. The bottom gauge in the right photo is a 1600 (only goes to 7K) and the upper one is a 2L.

Will
Sorry, I find modern engine swaps revolting. Keep your G, R, or U series in your Roadster!

Toptech360
Roadsteraholic
Posts: 679
Joined: Mon Oct 28, 2013 1:59 pm
Location: Bellingham, Washington

Re: Tach differences 1.6 vs 2.0

Post by Toptech360 » Wed Jun 12, 2019 6:03 pm

Differential ratios do not affect engine rpm at tachometer. On our cars it's measured off a cable attached to the distributor.
Dan
1964 Datsun SPL310. The Datsun
1997 Toyota Tacoma LX 4wd. The Truck
2009 Subaru Forester XT.
2017 Toyota AWD Swagger Wagon.

User avatar
nismou20
Roadsteraholic
Posts: 1246
Joined: Thu Jul 07, 2005 2:16 pm
Location: Pasadena, Ca

Re: Tach differences 1.6 vs 2.0

Post by nismou20 » Wed Jun 12, 2019 6:24 pm

Well, that’s what I originally thought but the locations of speed increments are positioned differently on the 2 tachs. If I swapped between the 2 tachs the speed indication would be different no? Also my biggest curiosity was the 1600 without a 0 mile stop pin. There isn’t one and the needle sits way down by turn signal lt. is this normal on some 1600s. Or should they all have a 0 mile stop pin?

Toptech360
Roadsteraholic
Posts: 679
Joined: Mon Oct 28, 2013 1:59 pm
Location: Bellingham, Washington

Re: Tach differences 1.6 vs 2.0

Post by Toptech360 » Wed Jun 12, 2019 6:45 pm

Someone should know! I do not though. It would be possible to test both tachs and compare them to a service tach or timing light that shows rpms.
Dan
1964 Datsun SPL310. The Datsun
1997 Toyota Tacoma LX 4wd. The Truck
2009 Subaru Forester XT.
2017 Toyota AWD Swagger Wagon.

User avatar
ppeters914
Roadster Fanatic-Site Supporter
Posts: 2939
Joined: Mon Jun 28, 2004 5:51 pm
Location: Lake Forest Park, WA (just north of Seattle)
Model: 1500/1600
Year: Low Windshield-64-67.5

Re: Tach differences 1.6 vs 2.0

Post by ppeters914 » Wed Jun 12, 2019 6:54 pm

I think you mean 0 RPM not 0 MILE when referring to a tachometer.
Pete
-------------------------------------
'67 1600 - frame off in progress. What a stupid idea. :smt021
'66 1600 - parts car
'66 WPL411 - no engine or trans. If I was smart, I would sell it.
A couple of Porsches, a pickup, and a motorcycle

User avatar
theunz
Roadster Nut-Site Supporter
Posts: 1379
Joined: Sat May 02, 2009 1:54 pm
Location: Catoosa Ok.
Model: 2000
Year: High Windshield-68-70

Re: Tach differences 1.6 vs 2.0

Post by theunz » Wed Jun 12, 2019 8:28 pm

The tachometer’s internal gearing is probably different so the seeep can take up the same number of degrees on the face. They should work correctly for either engine.
__________

Mike M
1969 2000 solex mine since 1972, under resurrection. 1969 Porsche 911s -worth more, but not as valuable!

User avatar
caraddict
Roadster Fanatic-Site Supporter
Posts: 304
Joined: Tue Jul 10, 2007 11:11 pm
Location: Huntington Beach

Re: Tach differences 1.6 vs 2.0

Post by caraddict » Thu Jun 13, 2019 11:56 am

Calibration is exactly the same on both units. (You can put a 7K tach into a car that had an 8K tach or vice versa and it would read correctly)
There should be a pin in the dial for zero indication so the unit you are showing probably has a broken pin. Calibration would likely still be good but unless the tach had a major failure where the pointer spun around and broke the pointer.

Jon

User avatar
mraitch
Monthly Subscriber-Roadster Enthusiast
Posts: 3396
Joined: Mon Oct 02, 2006 7:03 pm
Location: Lake Balboa (SFV) - CA
Model: 1500/1600
Year: High Windshield-68-70

Re: Tach differences 1.6 vs 2.0

Post by mraitch » Fri Jun 14, 2019 1:15 am

Only the speedometer/odometer is affected by variances in wheels, tires, differential etc.
Peter Harrison
1970 1600 (Stroker) - TOAD SAN (Eliza)
1970 1600 (Stock) - As Yet Unnamed
Lake Balboa (SFV) , California