6BT/4BT question

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J

Jan-78FJ40

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Sep 6, 2002
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Hi All,.
Who knows about the cummins diesels that are frequently used for diesel conversions? Are they any good? comparable to Toyota diesel engines? Or just cheaper? Obviously Jeremaiah Proffitts makes a nice business (and does great work) doing these conversions. Why not 1HZs, for example?
Just interested...
If this is chat, please move it...

thanks,
jan
 
I thought the main reason to use cummings 4BT or 6BT in US are cheaper .. and easy to get spare parts .. here in Panamá cummings engine can be more expensible than a Toy engine ( are expensive BTW ) and place a turbo ..
 
Jan-78FJ40 said:
Hi All,.
Who knows about the cummins diesels that are frequently used for diesel conversions? Are they any good? comparable to Toyota diesel engines? Or just cheaper? Obviously Jeremaiah Proffitts makes a nice business (and does great work) doing these conversions. Why not 1HZs, for example?
Just interested...
If this is chat, please move it...

thanks,
jan
Click to expand...

Cummins have been making a good diesel for decades but I think if the 1HZ were more plentiful in NA ,then most owners would fit one in preference to the Cummins.
IMO the chev diesel would be a better swap if you have access a good kit.
 
hks3sgte said:
x2 on parts availability. Downside seems to be the huge lifts needed to fit these engines... well, some people like their trucks tall anyway.
Click to expand...

you see thats my problem. I don't like soa. I like them under. And I don't like 4 plus inches of lift.

To me 2.5 seems good. And if I had to go higher for a engine it would be a negaitve to me.

I don't think you need to go high for chev diesel. Normal works I sure.

I am not a big tire fan, and IMOP I think if you are running them your intention is to not get too far out there. As I would be scared of breaking stuff.

I would go out of my way to try not to have go with lift to clear the sump. Even if it meant making a remote sump. If you can do that.
 
I wonder what the implications of the weight of tht 6B-T are on the front axle housing. They are known to bend even under the load of the 2H, take out inner axle seals and wear deep grooves in the seal surface on the axle shafts.
I think the cummins motors are great but I'd sooner use one to pull a cruiser than power one.
 
Jan-78FJ40 said:
Hi All,.
Who knows about the cummins diesels that are frequently used for diesel conversions? Are they any good? comparable to Toyota diesel engines? Or just cheaper? Obviously Jeremaiah Proffitts makes a nice business (and does great work) doing these conversions. Why not 1HZs, for example?
Just interested...
If this is chat, please move it...

thanks,
jan
Click to expand...


I believe the main reason is cost and availability. a 4bt is probably haft the cost or less of a 1hz.
 
Jan-78FJ40 said:
Hi All,.
Obviously Jeremaiah Proffitts makes a nice business (and does great work) doing these conversions. Why not 1HZs, for example?
Just interested...
If this is chat, please move it...

thanks,
jan
Click to expand...
Someone who works at Proffits is doing his own 1HZ conversion;)
 
70sguy said:
I wonder what the implications of the weight of tht 6B-T are on the front axle housing. They are known to bend even under the load of the 2H, take out inner axle seals and wear deep grooves in the seal surface on the axle shafts.
I think the cummins motors are great but I'd sooner use one to pull a cruiser than power one.
Click to expand...

What would the difference be between a stock HJ60 with winch and bullbar, and an FJ60 converted to 6BT without winch or bullbar? Seems to be about even....
 
I'd have to say that it comes down to cost and parts as well. You can source a great 4bt for 1500-2000, whereas the 1hz's run 4000.00 and up. You've got to make/ weld in mounts for both of them, both have a great 5sp and auto option, and labor seems comparable. That said, anyone who has ever seen and heard the motors next to eachother (as I know most of you have) would probably go 1hz/ 1hdt for the sheer differences in sound and vibration. I have to agree with Sheldon that, while the cummins motors excel at what they are designed for, most of us drive our cruisers on a regular basis and the toyota diesels might be easier to live with.
 
Just to add to the above. I think this is why people have always sought the Isuzu diesels. They are easier to be found, they are quiet, adequate power, and if you know where to look parts are readily available. The Isuzu diesels are a lot more like the Hino and Toyota diesels and they are used stateside. By the way I know of the problems regarding the mysterious adapter, I am just trying to show why people often lean toward Toyota diesels.
 
brownbear said:
you see thats my problem. I don't like soa. I like them under. And I don't like 4 plus inches of lift.

To me 2.5 seems good. And if I had to go higher for a engine it would be a negaitve to me.

I don't think you need to go high for chev diesel. Normal works I sure.

I am not a big tire fan, and IMOP I think if you are running them your intention is to not get too far out there. As I would be scared of breaking stuff.

I would go out of my way to try not to have go with lift to clear the sump. Even if it meant making a remote sump. If you can do that.
Click to expand...

I feel the same way.

I am trying to find out more info about he Isuzu swaps. check this out... http://www.isuzudieselswapper.com/index.html

Also, I'm almost positive the GM 6.2/6.5L does not require a lift. Atleast two guys on MUD with 60's have done it already.

PS - Jan, what are you doing asking about 4BTs? Didn't you just finish that sweet HJ60?? :confused: :D
 
ChuckB said:
PS - Jan, what are you doing asking about 4BTs? Didn't you just finish that sweet HJ60?? :confused: :D
Click to expand...


purely for information. I have an extremely low opinion of US made automobile stuff, but people swap the Bt engines and chevy shortblocks all the time, so I am trying to understand why.
:beer:
Jan
 
I have been doing a lot of research on the BTs. Everything that I read indictates that the Cummings is a stout engine. I'm not going to even touch the SBC V8 topic though...
 
The Isuzu engines sure look interesting...

But I wonder why they are the same displacement and even similar name numbers as that of the cummins..."4BD1T" like darn thats similar..

How similar are the engines? 3k redline on the isuzu, so better have the gearing right for that one.
 
brownbear said:
3k redline on the isuzu, so better have the gearing right for that one.
Click to expand...

I dunno, I think it would be more a question of driving the vehicle like the truck its engine came out of...

My 1-ton (1992 diesel F350) effectively redlines close to 3k, and cuts the fuel about 3500, and it's pretty all right to drive. Gearing is key, yes, but I think the big thing in that truck is an overdrive transmission. It doesn't take too long to hit 5th gear, but I don't really want to go faster than 70 in it anyway. And 4Lo 1st is pretty damned impressive at idle with that big 7.3L diesel grinding away. :)
 
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