| Slant Six Forum https://slantsix.org/forum/ |
|
| 3800rpm @ 75mph https://slantsix.org/forum/viewtopic.php?t=11903 |
Page 1 of 1 |
| Author: | spconnor [ Wed Feb 23, 2005 11:22 pm ] |
| Post subject: | 3800rpm @ 75mph |
Cruising on the highway at 75-80mph, my engine is reaching 4000rpm. I hear of people cruising at 2-2.5k; What must be done to reduce engine RPM at high speed. I went from 13(185x60)'' to 14'' sbp cop wheels and that seemed to help. 225 with a 727 ; 3 on tree; 150#s in all cylinders, reaching 300k miles; smooth~ |
|
| Author: | 70valiant [ Thu Feb 24, 2005 5:34 am ] |
| Post subject: | |
you need to change your rearend gears. It sound like you are running 3.91's. I'm running 3.23's and 235/60R14's, I turn 3000rpm at 75 mph. when I was running 2.76's and 225/75R14's I would turn 2400rpm at 75mph. |
|
| Author: | DusterIdiot [ Thu Feb 24, 2005 7:53 am ] |
| Post subject: | Speedo gear... |
Not to ask the question, but when you changed rims, did you change tire size and did you change the speedo gear in the tranny to compensate for tires/etc...? Someone on here should have a conversion chart/ reference to help out. good luck,  -D.Idiot |
|
| Author: | spconnor [ Thu Feb 24, 2005 11:50 am ] |
| Post subject: | |
No, I did not change the speedometer gear, infact after i removed the insturment panel to replace bulbs, my speedometer doesnt even work. I've tried to clean and grease it but nope. Is there any info on fixing those or installing a new one? Anyways I dont know the exact gear ratio but its a 69' 7 1/4 with what i eyeballed at around 2.75 |
|
| Author: | spconnor [ Mon Feb 28, 2005 10:36 pm ] |
| Post subject: | |
I got my speedometer to work correctly now (that was harder than it should've been) And that 3800rpm speed is at 80-85..maybe thats why my gas mileage is so bad. 25'' dia rear tires. 2.76 gears. 727 3spd tree. |
|
| Author: | sandy in BC [ Tue Mar 01, 2005 8:24 am ] |
| Post subject: | |
65 Valaint 3.23 gears 235/60/14 tires, 2350RPM at 83 mph,,,,, .70 overdrive. |
|
| Page 1 of 1 | All times are UTC-07:00 |
| Powered by phpBB® Forum Software © phpBB Limited https://www.phpbb.com/ |
|