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04-11-2005, 05:03 PM | #1 |
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All you guys with factory tach's
So do you guys just guess what rpm you are @ above 5,000..... to me that would be the most important time to know what rpm you are running..... and i know if my big block will turn 6,000 rpms then those small block have to push that much if not more....
just one of those questions that i have always had but always forget to ask... Rick
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04-11-2005, 05:10 PM | #2 |
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that's the lame thing about factory tachs, I have seen some on e-bay that relocate the tach where the gas gauge goes and reads to 7K.
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04-11-2005, 05:28 PM | #3 |
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ALOT OF PEOPLE THAT PLAN ON SPINING THEIR MOTORS FASTER THAN 5000 RPMs USE CAMARO TACH CONVERSIONS (I THINK THEY GO TO 7000) OR LIKE ME... I ALWAYS PUT AUTO-METER GAGES IN MY OWN TRUCKS. JOHN
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04-11-2005, 05:36 PM | #4 |
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NEVER NOTICED, I GUESS I'LL JUST SHIFT IT WHEN IT'S BURIED
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04-11-2005, 05:36 PM | #5 | |
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Emerald OOGLY 68 1/2 ton LWB with 250 6-banger and TH350 (soon to be 350 with TH400) |
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04-11-2005, 06:01 PM | #6 |
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http://67-72chevytrucks.com/vboard/s...threadid=82148
http://67-72chevytrucks.com/vboard/s....php3?t=137155
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04-11-2005, 10:01 PM | #7 |
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Yeah, Camaro tachs go to 7 grand. Of course in my Z28 7 grand would probably be about 1500 rpm past "Your engine is now toast"
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04-11-2005, 10:22 PM | #8 |
its all about the +6 inches
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in all reality, even when these tachs were new (talkin the camaro tach here too) they were never very acurate.....fast forward 35 years...or 25 for the camamro deal...and it is even less acurate.
All a factory tach is for is looking neat nad saying look at my options. It is pretty much crap if you plan to push your motor...actually, since it doesn't even go to the small block red line of 5500 RPM, (and I suspect it was the same for truck big blocks and inlines) then it is totally worthless if you plan to push it. |
04-11-2005, 11:47 PM | #9 |
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I'm a sissy and I don't take mine over five.
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04-12-2005, 12:08 AM | #10 |
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Mine would fall apart.
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04-12-2005, 01:52 AM | #11 | |
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5k? mine wont even come close
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Emerald OOGLY 68 1/2 ton LWB with 250 6-banger and TH350 (soon to be 350 with TH400) |
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04-12-2005, 07:37 AM | #12 |
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Since these are trucks,I think the intended use was more to maintain a constant engine speed(driving your tach)and to watch your revs when hauling/pulling in a lower gear.
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04-12-2005, 09:51 AM | #13 | |
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junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. THERES ROOM FOR ALL OF GODS CREATURES RIGHT NEXT TO MY MASHED POTATOES// LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST |
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04-12-2005, 05:38 PM | #14 |
its all about the +6 inches
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it doesn't matter if you are in first gear pullin 5000 pounds doin 5500 RPM going up a 15% grade, or if you are in 4th doing 120 MPH....600 RPM off, is still 60 RPM off, and at 5500 RPM, that would make it more like 6100 RPM !!! That's enough to scatter a stock engine if you are holding it there.
Another reason I think these stock tachs were kinda stupid...even back in the day when the truck was being used as a truck... you get a 4.10 or a 4.56 geared 3/4 ton, and your going down the freeway at 70 MPH, (typical early 70's speed limit) what kind of RPMs you turning? (can anyone pull that up for me for argumentitve reasons?) What if you were passing some one and wound it up to 90? I'm sure there were some states that actually had 80 or even 85 MPH limits....Montana comes to mind. If you were used to spinning 5000 RPM just to keep up with traffic, and had to spin it higher...you wouldn't know where you were. IMO, they are just ornimentation. Eye candy if you will. |
04-12-2005, 05:49 PM | #15 | |
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04-12-2005, 08:57 PM | #16 |
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^ I second what he said ^
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04-12-2005, 10:37 PM | #17 |
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One good use for them though. If you haven't gotten around to lubing that speedo cable then it might help you figure out how fast your going while that needle bounces all over the place.
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04-13-2005, 03:36 AM | #18 | |
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04-13-2005, 11:00 AM | #19 | |
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Transmission Ratios: 1st: 6.55 2nd: 3.58 3rd: 1.7 4th: 1 Tire Diameter 1: 31.5 inches Rear Gear Ratio 1: 4.10:1 MPH RPM 1st 2nd 3rd 4th 1000 3 6 13 23 1500 5 10 20 34 2000 7 13 27 46 2500 9 16 34 57 3000 10 19 40 69 3500 12 22 47 80 4000 14 26 54 91 4500 16 29 61 103 5000 17 32 67 114 5500 19 35 74 126 6000 21 38 81 137 6500 23 41 87 149 7000 24 45 94 160 7500 26 48 101 171 8000 28 51 108 183
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