 Tachometers |
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| RiqueMar |
 Sep 29 2011, 07:49 PM
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#1
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Enrique Allen Mar  Group: Members Posts: 2,179 Joined: 28-August 08 From: San Diego, CA Member No.: 9,478 Region Association: Southern California 
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Ok, so I know you have to use the same Tachometer that the engine originally used, 2.0 with 2.0, 2.2. with 2.2 and so on.
Having a bunch of Tachometers laying around and not knowing which goes where, how do i tell the difference? |
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| Series9 |
Sep 29 2011, 08:02 PM
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#2
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Lesbians taste like chicken. Group: Members Posts: 5,444 Joined: 22-August 04 From: DeLand, FL Member No.: 2,602 Region Association: South East States |
Tachs work with a style of ignition, not an engine size. Of course, placarded red lines could vary depending upon the original application.
There are tachs that work with points ignitions (like 914/4s), tachs that work with the CDI box ignition systems and tachs that work off the low-volt signal produced by modern engine management computers. What do you have? |
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| TheCabinetmaker |
Sep 29 2011, 08:03 PM
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#3
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I drive my car everyday Group: Members Posts: 8,325 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
1.8,1.7.&2.0 all used the same tach.
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| Valy |
Sep 29 2011, 08:38 PM
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#4
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Senior Member Group: Members Posts: 1,677 Joined: 6-April 10 From: Sunnyvale, CA Member No.: 11,573 Region Association: Northern California |
QUOTE(vsg914 @ Sep 29 2011, 07:03 PM)  1.8,1.7.&2.0 all used the same tach. (IMG:style_emoticons/default/agree.gif) |
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| Tom_T |
Sep 29 2011, 10:29 PM
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#5
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TMI.... Group: Members Posts: 8,320 Joined: 19-March 09 From: Orange, CA Member No.: 10,181 Region Association: Southern California
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I think he's talking about /6 tachs.
Best way is to check the part nos. on them against the appropriate PET downloaded from the Porsche website's Classics area (same place as you find the 914 PET). Otherwise you could call a dealer & hope a kindly parts guy will do a look up for you. |
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| SLITS |
Sep 30 2011, 07:14 AM
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#6
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
Look for one with a 6300 RPM redline (2.0, 2.2, 2.4, 2.7) ... and on the back it will say 6 Zyl. Of course you can go for an early with a 7K redline (S tach) and fool your friends.
And if all else fails, I'll find my 7K tach and offer you my 6.3K tach that's in the Grey Ghost. |
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| RiqueMar |
Sep 30 2011, 08:43 AM
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#7
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Enrique Allen Mar Group: Members Posts: 2,179 Joined: 28-August 08 From: San Diego, CA Member No.: 9,478 Region Association: Southern California
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Thanks for the help so far guys!
I have a 77' S engine that is bored out to 2.9. I think I have the right tach, but I want to make sure and not mess anything up. Will the boring out affect my redline? |
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| Cupomeat |
Sep 30 2011, 11:37 AM
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#8
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missing my NY 914 in VA Group: Members Posts: 1,338 Joined: 26-November 07 From: Oakton VA Member No.: 8,376 Region Association: MidAtlantic Region |
QUOTE(RiqueMar @ Sep 30 2011, 10:43 AM) Thanks for the help so far guys! I have a 77' S engine that is bored out to 2.9. I think I have the right tach, but I want to make sure and not mess anything up. Will the boring out affect my redline? In theory, boring an engine will have limited impact on an engine's redline. That being said, if the larger pistons are heavier than the original, I'd back it off a bit, but usually it is more about mean piston speed and valve train. |
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