More torque in LD28

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

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Kolatogari
Posts: 30
Joined: 13 years ago
Location: Iceland

More torque in LD28

#1

Post by Kolatogari » 13 years ago

Hi there, I from Iceland and I'm new on the board.

I got a LD28 in my '85 Range Rover. the engine came out of '83 Laurel.
She's working fine but, lacks a little bot of torque on hi speed. She having a hard time to push the car on 38" tires.

my question is, how can I tune op the engine without damage her lifetime?
I rather not go with turbo mod.

BTW the engine only got 150.000 KM on it. so almost brand new.

diesel-man
Posts: 150
Joined: 14 years ago
Location: Elkton, MD

#2

Post by diesel-man » 13 years ago

Welcome to the Nissan Diesel board!

38" tires are a lot to push and the engine you/we have is 80HP. To my knowledge there are no performance parts for a LD28, and if there were, none would do any good without a turbo. In the USA none were imported with a turbo, so none of us here have any tricks up our sleeve.

The only thing you can do without a turbo is carry enough air in the tires to reduce rolling resistance, a clean air filter and choose a reasonable gear for the amount of RPM.

LD28 engines have a short stroke which gives a little more RPM, but is weak on torque. It is just the nature of the beast.

Kolatogari
Posts: 30
Joined: 13 years ago
Location: Iceland

#3

Post by Kolatogari » 13 years ago

well, he's good good for highway use, but when driving in mud or up to clacier, it lacks a bit torque. Friend of mine has old 2,8 patrol engine in his range rover. But thats turbo engine. I allredy got a open 3" exhaust and a K&N filter. I also chanced the Diff ratio to match with the 38" tiers. Is it possable to chance the camshaft or anything like that? couse we usualy custom made things like that here in Iceland, also headers.

BTW, theese 80hp can push this truck up to 140kmh on hiway :D

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asavage
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#4

Post by asavage » 13 years ago

That Patrol engine had at least 20 HP more than the LD28, right from the factory.

You'll have to add a turbo.
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.

Kolatogari
Posts: 30
Joined: 13 years ago
Location: Iceland

#5

Post by Kolatogari » 13 years ago

Ok, found a turbo that can easy be mixed with the engine. It's from a old 12ton Scania truck. then I found a intercooler from 5,9 cummins. thats should do the job :D

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kassim503
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Location: Stony Brook, NY

#6

Post by kassim503 » 13 years ago

That Scania turbo is gonna crank boost like none other
'83 maxima sedan, l24e, a/t, black

227K SOLD 6/7/2012

moose60
Posts: 168
Joined: 13 years ago
Location: Seattle WA

#7

Post by moose60 » 13 years ago

Hell, it might not make much boost if it's sized for a big motor. It could be perfect, but the Scania motors I looked up are from 8 to 14 liters in displacement. I'm eager to see photos of the monster LD28.
:D
Byron

82 Datsun 720 KC SD22

MPG Machine

Kolatogari
Posts: 30
Joined: 13 years ago
Location: Iceland

#8

Post by Kolatogari » 13 years ago

I think this one is 11L but not sure. I'll send some photos then it's done. :wink:

diesel-man
Posts: 150
Joined: 14 years ago
Location: Elkton, MD

#9

Post by diesel-man » 13 years ago

You might want to chat with someone at length that has scabbed an oversize turbo onto a little diesel already...you know... to save the engineering headaches.

I think a twin turbo setup would be really awesome! Can you imagine the boost two (11 Liter) turbos could make? Four maybe? Possibly some oversize headbolts? Propane injection? You may need bigger tires after all that!

Well, good luck, your gonna need it :roll:

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asavage
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#10

Post by asavage » 13 years ago

Where the heck are you going to get enough exhaust to drive the turbine on that turbo that came off an engine almost four times the displacement of an LD28?

Have you considered the 280ZX Turbo retrofit?
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.

Kolatogari
Posts: 30
Joined: 13 years ago
Location: Iceland

#11

Post by Kolatogari » 13 years ago

well, most of turbos in old truck are wery small. this one has 3" intake on the exhaust. and the air intake is 2,5". this is from a '74 model or somthing like that.

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