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Thoughts on engines


 
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el_dubya
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Joined: 20 Sep 2005

PostPosted: Tue Aug 01, 2006 6:23 pm    Post subject: Thoughts on engines Reply with quote

I have been thinking recently about options for engines in my TJ. I have the 2.5 and have had 2 thoughts. First thought is a turbo charger. Just wondered if it's ever been done and what kind of performance and MPG gains you could get. I know, somebody is gonna say "Its a 4 banger, get over it." But I think it's fun to see how much you can squeeze out of something. Anybody can swap an engine out, why not do something different? My other thought was swapping in a small diesel engine. I have heard of IH Scouts with diesels getting 40 MPG or better, just wondered if this had been done. Now I know economy in a Jeep is mainly poor due to aerodynamics, but these are just some things I thought about and discussed with a couple people. Just wanted ya'lls opinion on the matter. And if you're gonna say "Just swap in a bigger motor" or "Economy is bad because it's a box" don't even post. Remember, these are just ideas and I want some input. Thanks.
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Dub

'98 TJ SE
15x7 ProComp Series 51 Rock Crawler Wheels
31x10.50 General Grabber AT2's
Taurus Fan
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Renegadestang
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Joined: 07 May 2005
Location: Marietta, GA

PostPosted: Tue Aug 01, 2006 9:17 pm    Post subject: Reply with quote

I've seen a 4.0L-powered TJ with a turbo, so a 2.5L shouldn't be too much different.
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1998 Jeep Cherokee Sport: 4.0L, AW4, 235/75 Wild Spirit's

1981 Jeep CJ-7 Renegade: 307-4V SBC, SR-4 4-spd., 31x10.5 Wild Spirit's

1966 Ford Mustang: 289-4V, C4 Auto.
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TheBrat97
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Joined: 28 Jul 2006
Location: Dallas, TX

PostPosted: Tue Aug 15, 2006 9:00 pm    Post subject: Reply with quote

I've heard of guys dropping a small block Chevy backed by a TH400 and loving it...that doesn't answer the fuel economy part though
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pipxj
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Joined: 22 Jan 2006

PostPosted: Fri Oct 06, 2006 8:03 pm    Post subject: Reply with quote

Turbos will usually decrease your fuel efficiency. By adding more air, you're going to need to add more fuel to the mixture to attain a proper ratio.

In most aircraft that I deal with the turbocharged versions of the same engine will typically burn upwards of 3gallons per hour more at similiar power settings.
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330T
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Joined: 29 Sep 2006

PostPosted: Mon Oct 09, 2006 4:55 am    Post subject: Reply with quote

if you go turbo you really should put in low compression pistons, and any increase in MPG will be off set by costs in installing the turbo. Also for trail or rock crawling a turbo would not be ideal since there is turbo lag. just go test drive a turbo jetta.

The diesel would not be a bad way to go. good power, and a diesel lasts forever.

The CRD from the liberty will bolt right in, or close to it, but those will cost a ton from a salvage yard.

You could get a old Toy, VW diesel and fab up some form of adaptor plate to attach it to your trans
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el_dubya
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Joined: 20 Sep 2005

PostPosted: Tue Oct 10, 2006 5:35 pm    Post subject: Reply with quote

never thought about the lag on rocks and stuff
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Dub

'98 TJ SE
15x7 ProComp Series 51 Rock Crawler Wheels
31x10.50 General Grabber AT2's
Taurus Fan
Uniden PC68 Elite CB
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