![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
|
![]() |
#1 |
Senior Member
![]() Join Date: Dec 2003
Location: Pampa, Texas
Posts: 1,554
|
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
__________________
https://www.ebay.com/itm/29620574751...mis&media=COPY |
![]() |
![]() |
![]() |
#2 |
Registered User
Join Date: Jan 2005
Location: Colorado Springs
Posts: 693
|
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.
__________________
1971 GMC K1500 SWB Fleetside, 4" skyjacker softride and, 14 Bolt FF, HD Dana 44 4.10's 1970 K5 TBI conversion lifted etc SOLD 1968 C20 camper truck SOLD “To ban guns because criminals use them is to tell the innocent and law-abiding that their rights and liberties depend not on their own conduct, but on the conduct of the guilty and the lawless.” Jeff Snyder |
![]() |
![]() |
![]() |
#3 |
Registered User
![]() Join Date: Aug 2001
Location: SOMERSET KY.
Posts: 6,427
|
![]() ![]() ![]()
__________________
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. ![]() 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 |
![]() |
![]() |
![]() |
#4 |
The LuvShack Garage
Join Date: Jan 2004
Location: Maple Grove, TN (West Side)
Posts: 30,477
|
![]() ![]()
__________________
Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T |
![]() |
![]() |
![]() |
#5 | |
Got trucks?
Join Date: Mar 2005
Location: Garden City, Idaho
Posts: 68
|
Quote:
![]()
__________________
Emerald OOGLY 68 ![]() |
|
![]() |
![]() |
![]() |
#6 |
Registered User
Join Date: Feb 2002
Location: Vacaville, CA
Posts: 2,746
|
http://67-72chevytrucks.com/vboard/s...threadid=82148
http://67-72chevytrucks.com/vboard/s....php3?t=137155
__________________
![]() ![]() 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI |
![]() |
![]() |
![]() |
#7 |
Where's my beer?
Join Date: Oct 2004
Location: Glen Allen, VA
Posts: 1,771
|
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"
__________________
70 C10, shortstep, .30 over 250,Hurst shifted 3 spd parts hauler. Holley 390, Clifford Intake, Header, ported cylinder head, unknown bigger cam. 79 Corvette L82, 4 spd, black, red interior, headers, flowmasters, and unkown bigger cam. '03 Grand Cherokee Laredo, 4.0 4x4 daily driver. 165K miles, and runs great '08 Tahoe LTZ 4x4 155K |
![]() |
![]() |
![]() |
#8 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
|
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. |
![]() |
![]() |
![]() |
#9 |
Senior Member
Join Date: Jan 2005
Location: Loveland Co.
Posts: 3,098
|
I'm a sissy and I don't take mine over five.
![]()
__________________
Chris 74 Custom Deluxe SWB 350/350/3.73’s 99 2wd Silverado RCSB 5.3/4L60/3.90’s http://www.classictrucks.com/feature...short_bed.html |
![]() |
![]() |
![]() |
#10 |
Custer had a plan too.
Join Date: Dec 2003
Location: No. California
Posts: 344
|
Mine would fall apart.
__________________
72 K15 GMC (aka Big White) Performance Rockers, Cab Corners, and Floors Fossil Fuel Glutton Neighborhood Nuisance 98 BMW 540i for Speed (Sold ![]() 05 Subaru Outback for mileage |
![]() |
![]() |
![]() |
#11 | |
Got trucks?
Join Date: Mar 2005
Location: Garden City, Idaho
Posts: 68
|
5k? mine wont even come close
Quote:
![]()
__________________
Emerald OOGLY 68 ![]() |
|
![]() |
![]() |
![]() |
#12 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
|
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.
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
![]() |
![]() |
![]() |
#13 | |
Registered User
![]() Join Date: Aug 2001
Location: SOMERSET KY.
Posts: 6,427
|
Quote:
![]()
__________________
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. ![]() 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 |
|
![]() |
![]() |
![]() |
#14 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
|
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 !!!
![]() 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. |
![]() |
![]() |
![]() |
#15 | |
Registered User
Join Date: Jan 2003
Location: Mesa, Arizona
Posts: 125
|
Quote:
__________________
Paul 72 Cheyenne Super Custom Camper greenaz@hotmail.com |
|
![]() |
![]() |
![]() |
#16 | |
Registered User
Join Date: Feb 2004
Location: Hilly Southern Indiana!
Posts: 201
|
Quote:
__________________
68 K-10,79 K-10,80 C-30 57 chevy convertible 79 Z28 |
|
![]() |
![]() |
![]() |
#17 | |
II Timothy 4:2
Join Date: Mar 2005
Location: Fort Worth
Posts: 361
|
Quote:
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
__________________
72 C-20 2WD LWB Custom Camper Deluxe 350 4 Speed "Project Lazarus" MY TRUE PRIDE AND JOY "Dangit, Bobby, people will see that oil stain and think I'm a drunk." |
|
![]() |
![]() |
![]() |
#18 |
Registered User
Join Date: Apr 2003
Location: NB
Posts: 3,367
|
^ I second what he said ^
__________________
1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD |
![]() |
![]() |
![]() |
#19 |
Registered User
Join Date: Jan 2004
Location: Elmira, Oregon
Posts: 449
|
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.
![]() |
![]() |
![]() |
![]() |
Bookmarks |
|
|