I have done alot of research on how to increase power in my 85 GM 6.2 diesel. Turbo, maybe dual turbos, propane, possibly nitrous, maybe computer programs. . . but is it possible to bore the 6.2 to perhaps a 6.6? would that put the block at risk of cracking? is it even possible with a diesel? any info pros and cons would be greatly appreciated.

those engines have a bad enough rap with heat and you want to bore it? Your problems will be... never try to get displacement from boring, it comes from the stoke and i am certain no one make a stroker crank for a 6.2. HEAT HEAT HEAT. even if you bore it and get pistons that work you will never get even close to 6.6l. that would be approx like adding about 25ci which equates to drilled water passages.

I don't want to sound like a total sour puss, but the stroking idea just isn't going to be worth the effort.

Well thats why i posted, to search for ideas and find out which are good and which are bad!

Check out www.dieselplace.com
I think there is something in swapping a 6.5 crank?
If it were mine, I would crank the pump all the way up, let the engine melt, then swap in a bbc

put a turbo on it, set of boost and pyro gauges and go with it. If you do bore use a set of low compression pistons with the turbo maybe add a intercooler. The 6.5 crank won't gain you anything same stroke just a different seal design that won't work with early block. Might find a race shop or really good machine shop to index grind the crank to get max stroke out of it. The heat issues can be dealt with using common parts now out.

www.ssdieselsupply.com deals with the 6.5 and i think they have some stuff for a 6.2 also, worth a shot

You can bore the block to 6.5l and use 6.5 pistons and rings but it's not really worth the expense.

What vehicle is this in, what is the 8th digit of your vin, and what is the purpose of the vehicle (tow or off roading)?

The J code 6.2s had a different intake design and developed more power, basically the HD version of the engine. If you don't have a J code engine you can still find and use the intakes.

Consider getting an all gear timing set up.
Get a high flow H20 pump.
Use the correct thermostat, do a google for Kennedy Diesel and give them a call for the pump and t-stat.
Turn up the fuel about 1/8-1/4 turn on the IP.
Advance the timing about 1/4" past the timing mark.
Open up your intake and exhaust. If you are not going to go turbo you can get headers for the 6.2, but they run $400. If you have access to a water jet or CNC plasma and can get manifold plates cut you can get some chevy big block headers, cut off the plate, and weld the pipes to your new plate. The exhasut ports are like 1/4-1/2" off between the engine (get a set of exhaust gaskets from a 454 and 6.2 and compare :D ) Port the exhaust and flange to match. Wrap the headers and use dual 3" pipes. Get the heat away from the engine.
Get the J code intake, and then modify the airfilter housing by adding a second air trumpet. Cut the trumpets so they have a 3" opening and then use some flex hose to plumb them both to fresh air.
Install an egt gauge.
Doing all this you can build a 6.2 to put out 200hp and 300ftlbs of torque with out going turbo.

Next up in the power output would be to
Get some 6.5 heads, 6.5 high pop injectors, and a 6.5 mechanical IP (think its the 6911)

If this isn't good enough for you call banks and get their turbo.
Get an intercooler.
Get a boost gage.
If you know in advance you are definately getting a turbo get the low compression ceramic pistons.

After this, second Banks, so you can have a twin turbo. Loose the cross over and modify the banks exhaust to work on the other side.
Propane injection, this lowers EGTs.

The #599 block can be bored to 6.5L displacement. I would add a basic turbo kit (or use stock 6.5TD stuff). Redo the pump for the turbo. Maybe a propane kit. Gear drive cam also.

The way I see it, the 6.5TD maxed out the 6.2L engine design. If you need more jam that that, start with a completely different engine.

The way I see it, the 6.5TD maxed out the 6.2L engine design. If you need more jam that that, start with a completely different engine.


X2

The 6.2 was a pretty good mill...gutless stock, but ran forever provided you knew the quirks.

There was a guy who put some big bucks into one and ended up with making around 250rwhp...i believe he was on the 6.2/6.5 page that may give you some ideas.

The easiest way to get to around 200hp is the banks turbo...wont make it a tire shredder but what a difference over the stock n/a motors.

Next up in the power output would be to
Get some 6.5 heads, 6.5 high pop injectors, and a 6.5 mechanical IP (think its the 6911)

.

That was going to be my suggestion.

The biggest improvement I made to my 6.2 was getting it in front of a sm 465! I went from hating it to loving it with a tranny swap, the th400 is a power sucking Mfer. My J-code 6.2 finds its power band much easier with the 4spd., hell a nv4500 would even be better!

Leave it stock or be prepared to sweep it up.

my.02

if heat is a real problem, then turbo will add a lot of heat. all that compressed air gets HOT quick.

and don't worry about twin turbos... they are more or less old-hat, what with new turbo technology and turbos bigger than a bowling ball. besides, they are a PITA to synchronize (i mean it would cost a shit load).

normally i'm a BIGGGG proponent of forced induction, so turbo is my vote. but not until you address how you are going to get more fuel to go with all that new air.

and, if people say heat is a problem... maybe you should look at a 4-core rad with a lower thermostat temp too.

and, if people say heat is a problem... maybe you should look at a 4-core rad with a lower thermostat temp too.

Like the lower temp thermostat will make the motor run cooler if it has overheating problems :shaking:

All very incredible advice. Much, if not all, of which will be put to use. Somebody talk to me about nitrous in addition to propane, and a supercharger in addition to turbocharger/twin turbos. I understand the expense of what im talking about, but lets have this discussion in the ''unlimited funds'' mindset. ;)

All very incredible advice. Much, if not all, of which will be put to use. Somebody talk to me about nitrous in addition to propane, and a supercharger in addition to turbocharger/twin turbos. I understand the expense of what im talking about, but lets have this discussion in the ''unlimited funds'' mindset. ;)

Nitrous is used to Cool down the intake and add O2.
Propane helps the diesel fuel burn more efficiently.
Supercharging is a good way to get the boost up from idle unlike turbo which need some RPM's to start spooling.
You can use Turbo+Propane+nitrous or Supercharger+propane+nitrous
I don't know if I would use a turbo and supercharger together although I heard someone did.
:eek:

one of my friends runs a cucv . he recently added the 6.5 intake and turbo, and messed with his pump and it is a completely different rig. i know thats the typical red neck story , my buddys got this or that but hes not on this forum . just giving my .02 . that bolt on definelty helped the ol 6.2
later ryan

The last time I talked to a sales rep over at Banks, they told me that they no longer make their Sidewinder turbo kits for the naturally aspirated diesels. However, that doesn't mean you can't find a used kit for sale on eBay or somewhere like that. One thing I have noticed on dieselplace.com is that people are making their own turbo kits using parts from the 6.5TD engine. I'm not sure if ATS still makes their turbo kit for the 6.2 either.

Scott

The last time I talked to a sales rep over at Banks, they told me that they no longer make their Sidewinder turbo kits for the naturally aspirated diesels. However, that doesn't mean you can't find a used kit for sale on eBay or somewhere like that. One thing I have noticed on dieselplace.com is that people are making their own turbo kits using parts from the 6.5TD engine. I'm not sure if ATS still makes their turbo kit for the 6.2 either.

Scott

Just called banks. They said that was not true, they are still being made. But hey if not, oh well. This project wont be starting for a while im just in the planning stages right now.

As a side note, if i wanted to look for a supercharger for the 6.2, where would i find one? who makes them?

Just called banks. They said that was not true, they are still being made.

OK, I stand corrected. Thanks for the info.

Scott