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Im new to this sight and this winter im planing on building a 6.5 engine and installing it in a truck. I have did some checking arround and have decided on lowering the compressen to 16:1 putting on a non wast gate turbo, and installing a pensler pump and different injectors. I have a frend who pulls tractors and he knows of a place that will lower the compressin for $50 a hole. i was wondering if any one has gone with this low of compressen and if they had any problems with it. also i plan on running stalk cam, crank and heads and wonder if i should change them any. biger valves are out of the question due to cost. Thanks for any help you guys can give me.
 

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With compression that low, you will definitely want to fit an intake air pre-heater in addition to the glow plugs (you'll want both...). One of the reasons for the high compression on the 6.2L/6.5L engines is ease of starting. I believe the Cummins engines came with intake air pre-heaters (at least some years.....). There are people out there who have built 6.5s with ceramic coated piston crowns and skirts, as well as ceramic coated heads, exhaust manifolds, etc. If/when I build a 6.5, I will probably go this route (at least for some of the parts, depending on cost) b/c it will help to both keep some of the heat out of the block (less for the radiator to have to dissipate) and also keep MORE of the heat in the exhaust to build turbo pressure. I have been in a Suburban with a ceramic coated and header-wrapped crossover pipe (and I believe downpipe as well....) which didn't have any internal engine mods, and it built boost very quickly.... Fun to drive
... I would DEFINITELY intercool it... I have recently installed a Cummins intercooler into my truck (with a decent amount of fabrication and "tweaking" required...) and there is another guy in the area who is planning on doing the same thing, we're trying to find time to meet up and talk shop. I haven't gotten the tubing to actually hook it up yet, so once I do keep your eye out for info on how it performs... Depending on your level of metalworking skill (or your budget) you may go with something like this, or just go the Spearco route, which is MUCH easier to install (although pricier, and it remains to be seen which one will perform better....) I also installed the Flex-A-Lite dual electric fans in order to make clearance, and even though I haven't gotten the intercooler hooked up yet, I have noticed a crisper throttle response and a little more high-end umph from not having the clutch fan on there. When I had the front of my truck apart, I took a garden hose to the radiator, A/C condenser, and oil cooler (first soaked them with Simple Green, then sprayed them from the back with the hose) and I was amazed and how much CRAP I washed out, considering that I had NO cooling problems. I also found that the Dex-Cool had left the inside of my radiator spotlessly clean, which I was happy to see. In the process of getting the intercooler to fit, I moved my batteries, and made a new air filter housing, which is right behind the headlight, and eliminates having to route the cold air through the small passage in the fender, as well as giving more space for the air to enter through all sides of the filter ('97-up round filter). This may also lend a little towards the engine breathing better.


As far as your questions regarding crank, heads, cam, etc... I don't know of any aftermarket parts for this engine (aside from a rumor of aluminum heads which may or may not even be available...). I know there are some 6.5s out there that have been made quite powerful with the stock crank, heads, and cam. There is definitely something to be said for polishing, and NOT machining the crank, so as to not take any material off of a part that has been known to fail. On that note, you should put a brand new harmonic balancer and pulley on. As for the heads, it would probably be best to just port-match them, and maybe smooth out the ports. I am also looking to fabricate a new upper intake piece when I run the piping from my intercooler, b/c I feel the stock one could definitely flow better.


Sorry about the long response....Best of luck with the project, and keep us updated!


-Chris
 

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Thanks for the info Chris. What you said was what i was looking for. on the inercooler you talked about i am not to famuler with the cummans inercooler are they air to air or liqued cooled? I have looked at the aftermarket inercoolers for 6.5's that are out there but where they mount have me consurned. this truck is gona be a farm truck asside from pulling stalk traylers and a flat bed. it will be ran down through corn feilds after combineing and stalks are sometimes standing about 1.5 feet tall and look to me like it would be verry easy to poke a hole through the inercooler also looks like a easy spot to get it packed with mud. I am pretty good a makeing parts for what ever is needed. please keep us posted on how your inercooler converson works out.
 

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Farmer;


The Cummins intercooler is an air/air intercooler, and is quite large. From end-tank to end-tank, is it 45 1/2", and the inlet/outlet are far enough apart to squeeze around the GM diesel radiator (which is almost 41" wide at the outside of the endtanks...). I don't take my truck off paved roads often, but I had similar concerns to your about the aftermarket 6.5 intercoolers, in that I could very easily see something flying off the back of a truck on the highway and damaging it, or having it get packed with dirt, snow, etc.... Here are a couple of pictures of the intercooler, and some of the cutting I had to do to get it to fit. I also had to make or modify the upper and lower radiator mounts, make new intercooler mounts, and relocate the air filter and both batteries.


























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