Best RPMs range for highway driving?
bluesman423
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- 1977 CJ5 258, Dana 300 with 4:1, SM420, 3.54 Dana 30 and AMC 20
1981 CJ7, 151, SR4, Dana 300, Dana 30 and AMC 20
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Best RPMs range for highway driving?
- Thread starter bluesman423
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- '85 CJ-7, 258/4.2L 6cyl. Bought new in 1985. Full cage, Warn 8274 winch, Ford 9" rear, front/rear Detroit Lockers w/4:88 R&P. T-5 tranny and 4:1 t'case. 33X12.50-15 BFG/AT, MSD ign, on board air---
2K below 'red-line'.
LG
LG
bluesman423
Jeeper
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- NE OKlahoma
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- 1977 CJ5 258, Dana 300 with 4:1, SM420, 3.54 Dana 30 and AMC 20
1981 CJ7, 151, SR4, Dana 300, Dana 30 and AMC 20
What is the redline?
- Posts
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- Springfield, Missouri-U.S.A. Earth
- Vehicle(s)
- '85 CJ-7, 258/4.2L 6cyl. Bought new in 1985. Full cage, Warn 8274 winch, Ford 9" rear, front/rear Detroit Lockers w/4:88 R&P. T-5 tranny and 4:1 t'case. 33X12.50-15 BFG/AT, MSD ign, on board air---
For a AMC 258 i6 / 4.2l /carb'd it's 4500 rpm.
Cruise(fwy)rpm of 2400-2600 is ideal for the AMC 258 i6 / 4.2l .
LG
Cruise(fwy)rpm of 2400-2600 is ideal for the AMC 258 i6 / 4.2l .
LG
bluesman423
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- NE OKlahoma
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- 1977 CJ5 258, Dana 300 with 4:1, SM420, 3.54 Dana 30 and AMC 20
1981 CJ7, 151, SR4, Dana 300, Dana 30 and AMC 20
I suspect the four cylinder is different from the AMC 258 i6 / 4.2l . Can't find that information anywhere.
- Posts
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- Springfield, Missouri-U.S.A. Earth
- Vehicle(s)
- '85 CJ-7, 258/4.2L 6cyl. Bought new in 1985. Full cage, Warn 8274 winch, Ford 9" rear, front/rear Detroit Lockers w/4:88 R&P. T-5 tranny and 4:1 t'case. 33X12.50-15 BFG/AT, MSD ign, on board air---
YUP
Forgot your talk'n about a 4-popper and not the AMC 258 i6 / 4.2l in your profile info.Quick 'GOOGLE' shows 5K max rpms-Search for yourownself to confirm this.
LG
Last edited:
gutthans
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- Pieces and parts...1975-2006 scratch-built CJ/YJ/TJ, titled as a 1988 YJ.
Assuming a stock GM 151 with stock tires and profile...Mine (many years back)seemed to like 2800 to 3200 as a nice happy place. My old (lean/rich) vacuum gauge read consistently in the green there, but started dropping off of ideal as I went faster. Oh, and that's with either no wind or with it at your back.
Behind a semi or with a good tailwind 3500 was very strong!
But seriously, I couldn't find the rated cam spec, BUT...the practical answer will depend upon how you drive and equip it. Just gear it so that whatever you have for tires puts you around 2500 - 3000 rpm at road speed (65).
Behind a semi or with a good tailwind 3500 was very strong!
But seriously, I couldn't find the rated cam spec, BUT...the practical answer will depend upon how you drive and equip it. Just gear it so that whatever you have for tires puts you around 2500 - 3000 rpm at road speed (65).