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Unread 09-27-2011, 05:18 PM   #16
superj
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1987 YJ Wrangler 
 
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You can do a stroker and cams

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Unread 09-27-2011, 05:29 PM   #17
AmmitOsiris
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Anything else?
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Unread 09-27-2011, 07:27 PM   #18
DocWills
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truthfully, your running a tractor motor you really need a new engine to soup it up past the basics.
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Unread 09-27-2011, 08:07 PM   #19
AmmitOsiris
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1990 YJ Wrangler 
 
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well if i want to put an msd

Part number
Image
Legend
Buy link
Ignition:
6425
Coil:
8205
Distributor:
8516
* Non Computer Controlled only
Spark Plug Wire Set:
31179


^^^^^all the msd stuff i gotta do can you please tell me if its a good idea and if so what would i have to do with the distributor since its non computer controlled only....
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Unread 09-27-2011, 08:13 PM   #20
Old4X
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If you want to mod the motor and think you can get it inspected, by far the biggest bang for the buck is putting a 4.0 head on your 4.2 block. Even staying with the weber, you will have a huge increase in power, far above anything you can do with the 4.2 alone.
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Unread 09-27-2011, 08:22 PM   #21
AmmitOsiris
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ok and how will it aall work out?
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Unread 09-28-2011, 10:55 PM   #22
NonRubicon
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Before you get too deep into building on the Weber, make sure you know what smog check shop to take it to when the next smog check rolls around. Technically the Weber is illegal on the 1990 4.2L Wrangler, even if it did pass smog. All it takes is a savvy smog tech to notice that the carb isn't stock, and you'll fail the visual inspection for smog. You have to be able to pass visual and emissions to get the smog certificate.

Just to reiterate:
Quote:
Here in CA, our street legal options for the 1990 4.2L YJ are:
  1. Sticking with the Carter BBD. Its a decent carb, but it takes alot of work and polishing to keep it running well. You cannot [legally] swap in any other carb.
  2. Upgrading to the California Howell TBI kit. Pricey, but from my experience with it so far, its worth it.
  3. Upgrading to Mopar MPFI kit. Expensive. Really expensive.
  4. Engine swap to something fuel injected like the Jeep 4.0L
Smog laws are really strict in California. As new new Jeep owner wanting to mod your engine, you might want to get familiar with the smog laws. Any aftermarket modifications technically have to be California Air Resource Board (CARB) certified. This gives certain aftermarket parts exemptions for use on specific vehicles. The Executive Order # (EO#) applies to select vehicles for each aftermarket part that is approved.

Headers, catalytic converters, ignition modules, ignition coils, fuel delivery system - everything fuel or emissions related must either be stock or CARB approved in order to comply with the law for street legal vehicles.
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Unread 09-28-2011, 11:44 PM   #23
AmmitOsiris
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Well my dad has this homie over here with a shop and they grew up together in sanfrancisco so I think it should pass he is the one who said it will pass
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Unread 09-29-2011, 10:10 AM   #24
timatoe
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Well good luck with that. If you sell it at some point in the future keep in mind the law requires you to ensure it'll pass State smog requirements.

If you get any of the MSD stuff make sure it's CARB compliant. If so it will come with a EO# Sticker, that gets placed on the inside of the hood so the smog guys can see it.
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Unread 09-29-2011, 08:31 PM   #25
wendell
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The best way to tune the carter for hp and speed is to remove it and replace with a holley 470 4 barrel and off intake ha ha.
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Unread 10-01-2011, 02:28 PM   #26
AmmitOsiris
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I can throw a 4 barrel on it?
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Unread 10-01-2011, 02:29 PM   #27
AmmitOsiris
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Off intake????
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Unread 10-01-2011, 04:19 PM   #28
Old4X
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Quote:
Originally Posted by AmmitOsiris View Post
Off intake????
Off = Offy = Offenhouser.
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Unread 10-01-2011, 05:36 PM   #29
AmmitOsiris
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Ok tank you
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Unread 10-01-2011, 09:11 PM   #30
timatoe
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Quote:
Originally Posted by AmmitOsiris View Post
I can throw a 4 barrel on it?
NO

Quote:
Originally Posted by NonRubicon View Post

Here in CA, our street legal options for the 1990 4.2L YJ are:
  1. Sticking with the Carter BBD. Its a decent carb, but it takes alot of work and polishing to keep it running well. You cannot swap in any other carb.
  2. Upgrading to the California Howell TBI kit. Pricey, but from my experience with it so far, its worth it.
  3. Upgrading to Mopar MPFI kit. Expensive. Really expensive.
  4. Engine swap to something fuel injected like the Jeep 4.0L

The Howell and the Mopar kits are C.A.R.B. approved kits.
You're making this far more difficult for yourself than it needs to be.
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