6.2 diesel in a 60 driving impressions (1 Viewer)

[FL cruiser]

I got tags and insurance a couple weeks ago and the 6.2 powered 60 is now my daily driver.
I has more power than I expected, but a little less fuel mileage than expected.

Fuel mileage: I'm getting 17.7 Mpg city driving. Took a 350-mile trip last weekend. Driving 70 to 75 MPH on flat ground with 5 passengers got 18.7 MPG.
I kind of expected a couple more MPG. I see claims of 23 to 28 MPG with this combo all over the net. I never have been able to achieve what other people are getting or claim to get. I only get around 19 to 21 MPG driving my brothers HJ60 or other brothers HZJ73. I think some diesel owners exaggerate their MPG's.

Power: It has more acceleration than I expected. I barely have to put my foot on the gas pedal to accelerate up grades or keep up with traffic. It doesn't accelerate like a gas V8 with my foot on the floor, but is somewhat faster than the 2F. I had originally planned on adding a turbo, but now feel I’m fine without it.

Noise: The 6.2 is louder than and doesn't have the smoothness of a 2H or 1HZ.
But it's not bad either. I think it's quieter than a B engine, Cummins, Isuzu or others.
I don't feel any vibrations inside at idle or driving. Quieter inside than expected.
At interstate speeds can’t tell there’s a diesel under the hood. Partially due to the road nnoise you hear in a 60 anyway.

Driving: I don’t use first gear at all. It feels like a granny gear. Engine is turning 2350 RPM at 65 MPH. The 5pd is 27% OD. I have 3:70 gears with stock wiener skin tires. The cruiser acts like it’s wanting taller gears or bigger tires. I’ll give it some bigger tires.
I feel an overdrive is a MUST have for a diesel conversion like this that will be driven at interstate speeds. With the stock radiator and a 7 blade GM fan, it never thinks about running hot.

I didn't go into this with high expectations after driving a few of the great Toyota diesel Land Cruisers. This in mind, it exceeded my expectations on everything other than fuel mileage.
My opinion on these conversions is: You do it because you like diesels or want something different. Not because you expect to recoup the cost of a conversion in fuel savings. I doubt my fuel savings will recoup the $4K plus time & labor I have invested in this project even if I were to get 25 MPG. At least not for a long long time.

I’m getting close to attempting to see how it runs it on waste cooking oil.

 

[Rice]

Thanks for the review. I'm close to talking myself into a 6.5 turbo in my next cruiser. Not a 40 though ... I need more camping room and believe a 60/62 would be perfect.

 

[overhanger]

Wouldn't that be the fuel pedal that you are stepping on now and not the gas pedal?

 

[HZJ60 Guy]

Wouldn't that be the fuel pedal that you are stepping on now and not the gas pedal?

HA!



TB

 

[Tapage]

Actualy my TLC have not much stock things in my TLC drivetrain .. but my 2H I remember, some 6 years ago when was stock give me some 34 Km/g so so ..

right now is strong check this ... but this is my feedback.

 

[Gumby]

My 6.2L 60 got back on the road yesterday. I spent a month waiting for the new driveshaft to be built. It now has a TH400 auto. Something I should have done first, but I wanted to save money. As FL says, an overdrive sure would be nice. A 700R4 or 4L80E would be a better choice. Mine will rarely leave town, the 400 came with the truck that sourced the engine, was recently rebuilt and is the bulletproof one ton truck version of the trans.

Good info FL. Hows the web page coming? Mine needs some serious updating.

 

[Tinker]

FL -
I think you could have projected the outcome with a little comparative analysis of the altenative diesel engines: the GM 6.2 has never been a stunning performer (all due apologies to you & Gumby).

But you do what you can, & we all live with compromises (except Wagonner5).

Bottom line: rubber overdrive is a cheap fix. Then a Ranger OD or Toybox. Biodiesel is way cool.

 

[Sorry Dog]

Fuel mileage: I'm getting 17.7 Mpg city driving. Took a 350-mile trip last weekend. Driving 70 to 75 MPH on flat ground with 5 passengers got 18.7 MPG.
I kind of expected a couple more MPG. I see claims of 23 to 28 MPG with this combo all over the net. I never have been able to achieve what other people are getting or claim to get. I only get around 19 to 21 MPG driving my brothers HJ60 or other brothers HZJ73. I think some diesel owners exaggerate their MPG's.

No way... LOL.

I drove a crew cab dually with a non-turbo 6.5 at work for while and got like 11 mpg, so it doesn't sound too bad.

 

[FL cruiser]

Todd,
At least with the Turbo 400, you'll never be concerned with tranny or clutch problems!

My web page has been on hold too. Maybe I'll find some time to update it.

 

[roscoFJ73]

FL cruiser some of those figures you see on the net regarding MPG figures are in Imperial gallons which are about 4.5 litres and the US gallons are 3.9 litres approx.

The reliable figures Ive seen are in the same range as yours.

Its a swap that is very popular in oz ,Ive got about 4 in my burb at last count

Theres a 105,100 ,75 series cab and a 79 series dual cab

 

[GLTHFJ60]

What type of mods do you need to perform to make the engine ready for waste cooking oil? Also, were you able to use yoursplit case TC with the 400?

It's a four cylinder, right?

Did you say only $4000?!?

 

[Gumby]

True about the 400. I expect my mileage to suffer some, but it's really easy to drive around now.

I do need to look at some more firewall sound insulation. It makes some noise at 55 mph.

I doubt you'll run into many durability problems with your tranny either.

Does the clutch disengage OK?

Bigger tires would be nice. The lift would help clear the oil pan too. The wife likes it just the way it is, so until she gets a FJ Cruiser, it's gonna stay the way it is.

 

[FL cruiser]

To run the waste cooking oil, no engine mods are needed. The cooking oil needs filter very well and heated so it's a thinner consistency before it gets to the inj pump. I'm using a Fluidyn heat exchanger (race car oil cooler) to heat it up.

V8 diesel.I spent most all that money on transmission, and Advance Adapter tarnny to transfer case adapter and clutch. Engine and donor vehicle was basically free. Hardware, nuts, bolts, hoses etc will add up.
A conversion doesn't have to cost that much. Ask Gumby.

I put some Fat Mat (like Dynomat) on the inside floorboards and firewall.
I didn't notice very much difference in the interior noise level. I didn't get the upper firewall behind the dash yet. Did what I could short of dash removal. Maybe I would notice mor difference then. For now I think it was kind f a waste of money and some jute under the carpet would have accomplished the same thing.

Clutch disengages and works fine. 12" GM clutch. Very light pedal pressure. I used a Wilwood 3/4" bore master. Internal slave. But so far it's been one of the few things on the conversion that worked right the first try and never needed any attention.

My front end hits my right motor mount if I hit a good pothole. Original springs and shocks have to go. I got a lift kit on order.

 

[GLTHFJ60]

I'm going to put a Cummins 4BT into my truck with an overdrive five-speed and the stock split case TC. Hopefully, it will not cost too much.

To run both grease and diesel, would it be advisable to have two fuel tanks?

 

[FL cruiser]

I don't blame you for going with a 4BT. Probably one of the best most durable, economical choices for a diesel engine that will fit in a 60. I would have used one if I had one. Listen to one or drive one. They are noisy. I'm ok with it. Some people wouldn't be. Lots of people running cooking oil with that engine without problems.

I'll PM you with some links that will answer FAQ's about veggie oil, tanks etc.
You'll need to run two tanks running straight grease.

You can get a rough estimate on costs on the adapters by visiting Advance Adapter website. If going with an NV4500, get their NV5000 book for $10. Not much to it, but it will give you some good info. Do lots of research. Tranny to xfer case adapter is $550. Depending the the bell housing and tranny used, you might have to by another bell housing to tranny adapter for $300. It will take time gathering parts, unless you want to fork out the $$ for new parts. If you go with all new parts and new NV4500 tranny, you'll have an easy $3k to $3,500 invested bell housing back. Those adapters aren't cheap. Neither are the 5 speed trannys,. Even used they are expensive.

 

[GLTHFJ60]

I have been doing more and more research and I am considering a 6BT. I think that I will go with that if it is not too expensive.

Used parts are just as good as new as long as they are in good condition. Where can I find parts for this conversion? Websites? Junkyards? I would expect junkyards, but in what vehicles would I look in?

 

[GLTHFJ60]

Never mind. I just found some specs on the 6BT and they make just about the same power as the 4BT but at a cost of $5000, which is $4000 more expensive than a 4BT. The four cylinder is what I will be going with, for sure.

By the way, thank you for the links in the PM!!

 

[BRUIN4]

I also want to convert to a 4BT in my 60, From what I have read the HP #'s on the 4BT can exceed the 6BT if its tuned right. Also check out the weight on a 6.

I am having a hard time finding a 4BT, ( the 6BT's seem to be everywhere) There is a sweet 6BT complete with zero miles on it on e bay right now, guy wants 10 grand!

If you know of any sources for 4bT's let me know.

-Bruin

 

[GLTHFJ60]

Go to turbodieselregistry.com and check the classifieds. There will probably be something there. Other than that, sit tight and keep your eyes open. That's what I'm doing...