258/4.2L Torque/HP charts Carter/Weber - JeepForum.com
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post #1 of 4 Old 09-16-2011, 08:38 PM Thread Starter
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2003 TJ Wrangler 
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258/4.2L Torque/HP charts Carter/Weber

I found these charts presumably from Weber comparing their carb performance versus the stock Carter. Obviously theirs perform better than the Carter (upper lines for 32/36 and 38 - I canít tell which is which) in all cases but what is telling (no big surprise here) is that:

1) the 258 gets max torque at 2K and tanks after 2.5K;
2) the 258 gets max HP at 3K (3.5K Weber) and tanks thereafter;
3) most economical operating range is 2K to 2.5K.

No really new info here, just nice to finally see some charts Ö


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post #2 of 4 Old 09-17-2011, 04:13 AM
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Man, that was not impressive at all. I hope those aren't really the numbers the engine makes, that is so sad for such Such a large displacement online 6.

I don't feel like working on anything at this time so i sold my yj.
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post #3 of 4 Old 09-17-2011, 06:38 AM
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The biggest problem with that engine is the head... it just does not breath. Look at what happens when you stroke it and use a better head or just the head alone.

87 YJ The Original!

Originally Posted by Anticanman View Post
It goes in that barrel you wheel out to the street once a week.

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post #4 of 4 Old 09-17-2011, 08:32 AM
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Those are likely dyno numbers (rear wheel HP). There is a reason car makers report shaft horsepower, the real numbers on all engines is rather lackluster. You'd be suprised what a 36 horsepower tractor can do, it is A LOT of power............................................. ..........Looks like the aftermarket carb gives maybe a 10% power increase over stock (at high rpms). That is IF you get it dialed in right. Not much bang for the buck in my book. And my engine never sees 3,000 rpms.

418 miles on 19 gallons of gas. Can't beat the BBD !
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