diesel to gas conversion?

Discuss (and cuss) the Nissan LD-series OHC Six diesel engine, popularly available in the US in 1981-83 Datsun/Nissan Maxima Sedans & Wagons.

Moderators: plenzen, glenlloyd, goglio704, Nissan_Ranger

davehoos
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#16

Post by davehoos »

real simple conversion for a L28 turbo gas.

IT'S called a RB30ET.500-1000 HP.

LPG produces less calories,so you produce less tourque.
in an older style factory engine it is cleaner burning and the mix is better, so with a tractor like cam and high compression it will feel much better.
WCJR31 Skyline.3.0 manual.wagon
R31 SKYLINE/Passage GT/PINTARA
LPG Ford Falcon 99-06 93 Disco
Local Shire Southern Zone Mechanic.
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asavage
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#17

Post by asavage »

asavage wrote:(apostrophe: award to the cat with the best ass)
Damn! Well, I fouled that one up.

That should have read:

catastrophe: award to the cat with the best ass

The joke is kind of lost, using the wrong word. Sigh.
Regards,
Al S.

1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.
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asavage
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#18

Post by asavage »

davehoos wrote:LPG produces less calories,so you produce less tourque.
This has not been born out in many tests. Yes, LPG is less energy-dense than other liquid fuels, and gaseous fuels displace air so the total charge reaching the cylinder is somewhat less. That's what the turbo and higher compression is for: to compensate for those. And turbo technology these days makes significant boost at low RPM -- torque is better, not worse.
Regards,
Al S.

1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.
goglio704
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Joined: 15 years ago
Location: East Tennessee

#19

Post by goglio704 »

Who gets credit for the term crank pirate anyway? I think it is original to this site. Seriously though, olie05, you are welcome here, even if you are a crank pirate and a block pirate. I think it is good that there is some cross pollenation between diesel and gas going on. Some of us dieselists may one day be turbo pirates. :wink:

I knew there was a rule about its. I just never remember the actual rule - just that there is one. Its (possessive pronoun) has no apostrophe just as his, hers, theirs, and ours (possessive pronouns) have no apostrophe.
Last edited by goglio704 15 years ago, edited 1 time in total.
Matt B.

83 Maxima Sedan, LD28, 5 speed, white, 130k miles. My original Maxima.
83 Maxima Sedan converted from gasser, LD28, 5 speed, 2 tone blue, 230k miles
82 Maxima Sedan, LD28, 3 speed auto, 2 tone Gray/Silver, 140k miles
81 810 Sedan, LD28, 3 speed auto, rust, rust, and more rust!

2005 Jeep Liberty CRD
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kassim503
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Location: Stony Brook, NY

#20

Post by kassim503 »

I may turbo my maxi soon
'83 maxima sedan, l24e, a/t, black

227K SOLD 6/7/2012
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asavage
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#21

Post by asavage »

kassim503 wrote:I may turbo my maxi soon
Keep in mind that if you take advantage of more fuel/air (pretty much have to on a gasser), it's not as simple as just hanging a turbo off the side. The compression ratio should be reduced, the pistons should be forged (rather than cast), and most turbo'd engines have oil squirters pointed at the bottoms of the pistons.

You don't have to do all those things, if you don't use the turbo much and aren't trying to get a whole lot of power out of it.

Because I'm not going to add more fuel to my LD28 when I add the turbo, I don't have to do those mods, but that's diesel -- not gas.
Regards,
Al S.

1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.
83_maxima
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Joined: 15 years ago
Location: Denver

#22

Post by 83_maxima »

kassim503 wrote:I may turbo my maxi soon
I'm working on that. I will let you know the specifics when I find out.

I know someone who has done it...twice.
olie05
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Joined: 15 years ago

#23

Post by olie05 »

kassim503 wrote:I may turbo my maxi soon
I see you are also a member over at hybridz.org. There is an entire forum over there dedicated to turbocharging the L6.

thanks for the welcome guys. I guess I did come onto the forum too "cranky" lol. Great site you have here!
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asavage
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#24

Post by asavage »

Humph. Gassifying an LD28's been done.

http://www.zcar.com/forums/read.php?f=1 ... ply_174337
Regards,
Al S.

1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.
olie05
Posts: 7
Joined: 15 years ago

#25

Post by olie05 »

thanks for the link asavage. I will save that info for when I build this engine.

I have talked to DAW, on hybridz, not on ZCAR. He used the diesel shortblock entirely. In my conversation with him he mentioned the idea of using custom pistons and rods, and getting the rod/stroke ratio around 1.8:1, through the use of 150mm rods and 33ish mm pin height pistons. That would be the route I would take. Lightened riciprocating assembly, and balanced everything. The LD rods are quite hefty. I have played around ALOt with ozdat's engine building utility.

http://www.ozdat.com/ozdatonline/enginedesign/
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