I, have a low milage 6.2 and would like to make it a more powerfull(HP&TQ)engine. I, have read where the moderator has suggested to drop comprssion to 18:1,add a turbo and intercooler and it would make 350-400HP,500+TQ. Iwould like to know a little more specified information. Like is any piston manufacture better than another, what turbo would be best to use(considering compatability, price and availability). Would a set of 6.5 heads be better than 6.2 heads. Use stock injectors or Hi-pop injectors. Is there a particular size intercooler that works best. and finally will this motor last with these modifications.


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Joseph,


I would suggest you begin to search the 6.5L forum for a complete perspective on your questions. The 6.2L and 6.5L are the same block with .3L difference in bore and different heads. 6.5L are known to go 400,000+ miles but we hear head gasket and cracked main web horror stories now and then.

In my experience with engines in general, gas & diesel alike, the more power you punch out of it the shorter the life span. Not trying to undermine quantum mechanic but I would doubt that with 400+hp out of a 6.2L would get 400,000+ miles like the stock 6.5L (making 200+hp) does. And those blown head gaskets and cracked main webing horror stories would most likely become reality for you if you didn't take the proper percausions like a main stud girdle kit that DSG sells( www.dieselservices.com (http://www.dieselservices.com) ). It is a kit that repaces the outer bolts on the 3 middle main caps with high tensile studs and girdles them together, since thats where the horror stories spawn from. Some sort of high pressure/high temperature head gaskets and ARP head bolts would help to.

It seems to be a combination of luck, mantinence and usage. If you set it up for a realistic 300 HP daily usage diesel with 18 or 19:1 compression, intercooling and perhaps cooling and oiling upgrades, and use it moderately it should last several hundered thousand miles.

I don't think that 350 to 400 hp is even possible out of a 6.2L. I think 300 hp would be about the most you could squeeze out of a 6.2L. A properly built 6.5L could probably be made for that much power, but even that would be pushing it. Peninsular Marine builds 400 + hp engines, but that's for a marine environment, and I doubt it would last long in pickup truck.


I don't believe you can buy 18:1 pistons for a 6.2L, only 19:1. For 18:1 pistons, you'd have to go to a 6.5L.


For serious power, start with a 6.5L block and build up from there.


6.5L block, 18:1 coated pistons from Peninsular, 6.5L turbo heads, high-performance injection pump and injectors from Peninsular, Peninsular's high flow turbo, intercooler...then you'll have some serious fun! (And some serious money! http://www.dieselplace.com/forum/smileys/smiley3.gif)


Or, just slap a turbo on the stock 6.2L and see how you like it!


Casey

Bill Heath had a twin turbo, 18:1 compression 6.2L in '90 that made 400 HP.

But when you put out 300-400 ponies you can't expect it to last, the blocks just aren't designed to handle it.(for any lenght of time) Agreeably very funhttp://www.dieselplace.com/forum/smileys/hihi.gif but extremely expensivehttp://dieselplace.com/forum/smileys/smiley35.gif concerning you are dealing with diesel performance and not gas. It seems to get a 100 HP gain in a diesel it costs 2 times if not more than it would to get the same increase out of a gasserhttp://www.dieselplace.com/forum/smileys/smiley7.gif.Don't get me wrong I am all for diesel power,it is the only way to gohttp://www.dieselplace.com/forum/smileys/hihi.gif, but all I'm saying it is a rip off tring to build diesel HPhttp://www.dieselplace.com/forum/smileys/smiley35.gif. Realy big wallet= Big powerhttp://www.dieselplace.com/forum/smileys/smiley5.gif

When you make those changes, your engines makes power more efficiently. The combustion event happens at cooler relative tempatures with timing advanced and intercooling combined with lower compression and higher boost levels (25-30 psi) gives you the ability to increase the O2 content and density per combustion event while maximizing the thermal value.


The truck will have a greater capacity for work and endurance under increased loads. The potential of the system is determined by the integrity of the components in the system. Many have run splayed mains and timing gears.


I encourage spending as little as possible for as much as possible on these system builds too.Edited by: quantum mechanic

Bill Heath's truck wasn't exactly a daily driver! Didn't he use a Ford/International inline injection pump or something like that? That was one custom engine, 'til it shelled out after the driveline let go. Now that's a pretty awesome 6.2L!


When I said it wasn't possible to get that much power out of a 6.2L, I meant that it wasn't a realistic goal for a daily driver. Bill Heath's and Peninsular's engines were all very custom made.


Casey

I guess I should actually try and answer the orignal question.


Since you have a low-mileage engine, I would just simply install a turbocharger, perhaps make an intercooler (you won't be able to buy one ready to fit for your truck), open up the intake and exhaust, and perhaps install a better performing fuel injection system. I see no need to replace the heads or pistons when you have an engine that is just barely broken in. Besides, replacing heads and pistons isn't really an upgrade, it's more of a replacement engine. No need to do that when you have a fine running engine to start with.


I'd start with the turbo and see how you like it...it might satisify your thirst for more power! I know that the turbo and 4" exhaust on my truck really makes a difference. I pull a 29' fifth-wheel on vacations, and I don't have any problems. I'm still not pulling like a Cummins or a Power Stroke, but it's good enough, and I don't have that much money tied up in my truck, either. Plus, I get better mileage as a bonus!


Hope this helps.


Casey

I have read that propane will not improve the 6.2 at all or very little. What do you guys think? I have a propane system from a car that I was thinking of putting on.

Propane can cool your intake and heat up the exhaust gas.

Which forum you see 350-400 HP if here I don't recall posting that much Hp anywhere 300 HP is pretty much the limit to what a turbo 6.5 with all bells and whistles will do and stay together, need to do some serious mods to get 400 Hp engine, I think there is a marine engine Tiger Shark super charged 6.5 for $20K advertising 400 Housing a custom block