18:1 CR 300 six?
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18:1 CR 300 six?
Hello, I would like to know if 18:1 CR is possible for the 300 six. My goal is to make a light weight diesel. I personally don't think it will last as long as I would like, but there's no harm in trying.Therefore it would also be good to know which years had the best quality steel in both the heads and blocks. I have decent machining skills, so I can over come many of the issues involved. Also since 18:1 CR is on the low side I plan on adding a turbo with roughly 10 lbs boost. this should make the final compression ratio closer to 23:1. Cooling would be provided by a 4 core big block after market alum rad and increased pump capacity. My injection pump would come from a older farm tractor. My final goal is to have a low HP, med Torque diesel good for roughly 150 miles. I also would like any info on alum (some 3-71 DD) or aircooled (duetz) diesel conversions. I also understand that Ford offered a BMW I6 diesel in some '80's lincons, were these reliable?
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This makes no sense at all. Go look at the rods and pistons in a diesel and compare them to the GAS MOTOR 300. You want to build a motor that will last 150 miles? Just drain all but a cup of oil out of your 300 and drive like heck. You will have accomplished, in the end, the same thing without wasting the other parts you mentioned.
GM tried this already, twice: Their gas V6's had a diesel variant---didn't sell. The Olds GAS MOTOR conversion: Junk due mostly to injector pump issues.
Ford did in fact offer a BMW oil burner in Lincolns. Didn't sell many. Nothing wrong with the engine, just a slow combo at the wrong time.
GM tried this already, twice: Their gas V6's had a diesel variant---didn't sell. The Olds GAS MOTOR conversion: Junk due mostly to injector pump issues.
Ford did in fact offer a BMW oil burner in Lincolns. Didn't sell many. Nothing wrong with the engine, just a slow combo at the wrong time.
Last edited by 85e150; Apr 24, 2005 at 11:40 PM.
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Thanks for you input, I was already aware of the piston/rod limitations. My main consern is if the block or head would self destuct. The 150 miles was supossed to be 150K miles or 150,000, sorry for the confusion. I want a light weight diesel because: 1 Then I can make my own fuel. 2 Add a snokel kit and Ford water upto your waist. 3 Not as nose heavy the big, but awsome PSD. This would therfore limit the need 3/4 ton running gear, suspension in the 1/2 tons/Broncos. 4 Increased mileage (old 6.2 NA chevs got mid to high 20's) The BMW option, currently has my intrest were they good up to 200-250 HP?
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The best bet to persue would be the Mercedes 5 cylinder jobs out of 300 TD sedans. You've got a proven motor with parts available and you can concentrate on adapting it to your vehicle. Power steering, electrical and even AC can be made to work.
Sorry for the harsh tone of my earlier post. I understand the appeal of this idea, but if it were doable, you would see kits for sale in the JC Whitney catalog and/or down at the auto parts store.
Sorry for the harsh tone of my earlier post. I understand the appeal of this idea, but if it were doable, you would see kits for sale in the JC Whitney catalog and/or down at the auto parts store.
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Joined: Feb 2005
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From: Parma Heights, Ohio
hell i think its a great idea, go for the gusto 
. has any one ever looked at a 6.0 diesel piston and rod looks like out of the new ford. i have, and its not to beafy at all. it looks like it was taken out of a gas engine.
i would like to now how your going to creat this comp. you only have .090 to shave the head till you touch the exhaust threads, and then you would be weakening the head. you can only take so much off the block too .020? as far as the pistons go the dish in it is perfect to absorb a fuel knock.
what about injectors may be unsqrew spark plugs to add a ijector. use an intake heater like catapillar to aid in cold starting since your static comp. ratio is low???????
there is a lot to think of ,and i beleive it can be done. good luck
. has any one ever looked at a 6.0 diesel piston and rod looks like out of the new ford. i have, and its not to beafy at all. it looks like it was taken out of a gas engine. i would like to now how your going to creat this comp. you only have .090 to shave the head till you touch the exhaust threads, and then you would be weakening the head. you can only take so much off the block too .020? as far as the pistons go the dish in it is perfect to absorb a fuel knock.
what about injectors may be unsqrew spark plugs to add a ijector. use an intake heater like catapillar to aid in cold starting since your static comp. ratio is low???????
there is a lot to think of ,and i beleive it can be done. good luck
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Joined: May 2002
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From: Broken Arrow, OK
I think a well put together 300 will make plenty of torque on gas. Most modern diesels are making about 1.5 ft-lbs per cubic inch. A turbo'd 300 on gas will do that. Hell, a naturally aspirated 300 will get close.
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Joined: Jan 2005
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From: Wichita, KS
Texas - that sounds cool. You might look back for some answers. The old Farmall (IH) Super M-TA diesel tractors started on gas and swicthed to diesel. They have a gas ingnition on one side of the engine and diesel on the other. Ok, that was kind of a rabbit trail, but the point is that the conversion can be done reliably. Deere and IH proved that. It can also be done haphazardly, with with erratic results, such as GM's versions. I've seen some of the old 350 diesels run for 300K miles, in pickups. So, it all depended on the combination of parts you got.
Maybe you need a bigger turbo, or a blower, in case you can't get the NA combustion high enough.
Sure, you could do a swap or build a gasser cheaper, but that would be an awesome project.
BTW, welcome to the board. Don't forget to read all the newbie stuff, and check out your state chapter. If you don't like yours, you're welcome to visit the KANSAS Chapter
Maybe you need a bigger turbo, or a blower, in case you can't get the NA combustion high enough.
Sure, you could do a swap or build a gasser cheaper, but that would be an awesome project.
BTW, welcome to the board. Don't forget to read all the newbie stuff, and check out your state chapter. If you don't like yours, you're welcome to visit the KANSAS Chapter
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