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RD28 Diesel ?


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bore: 85mm

stroke: 83mm

Bearing sizes and bearings are the same as a RB30. The rods would be no use in a performance engine as they run a huge piston pin, 26-27mm-ish from memory and the rod is way too heavy.

The crank is forged steel, not sure about snout/flywheel pattern. It would be top quality being a diesel as they are under a lot more load than a petrol engine, diesels also usually have larger radiuses on the journals although the RD28 might have fillet radiuses but i'm not sure on that.

The head gasket is very similar to an RB30, the bolt pattern is the same, I use the same plate to pressure test both. The RD28 uses a MLS head gasket which might be worth having a look at to use on an RB, it's available in 1.42, 1.5 and 1.58mm to set piston to head clearance on the diesel engine.

Thats about all I can tell you without having one here to look at.

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  • 1 year later...

I would assume(Going on the knowledge of the engines we have at work) That it being a diesel would have a much thicker block to cope with the greater compression ratio and heat produced.. I imagine that would help with boring it out to a greater capacity...

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very interesting - have you been in a car witht eh engine.

my old man has one in his 2000kg patrol. stock standard this thing pulls from 2000rpm (full boost by 2100rpm along with max torque) redline is at 4600rpm !!!

interested to know what its limits are and how much power you can get out of it

about 96kw 250nm torque - standard not interecooled

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We had a good long look at one of these about 5 years ago, there were some reasons it got rejected as a possibility..........mmmmm........they don't have block mounted oil squirters.........the crank has no provision for cam belt drive maybe......or was it oil pump drive.......hamonic balancer perhaps, not sure about main bearing cradle.

There isn't any foreseeable advantage over an RB30, the stroke was shorter (83 mm versus 85 mm) and the crank tested up much the same for hardness, same size bearings etc.

I think there is still one kicking around ther machine shop somewhere, I could always dig it out and refresh my memory.

:) cheers :D

Edited by Sydneykid
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Thanks all , I was just curious to know if the RD block would take all the RB30 internals but allow larger bore cylinders for the same external dimensions . I've not looked at an RB block for a while so I'm not sure how much meat there is between the cylinders . SK did the workshop test that one for core thickness ?

Thanks A .

Edited by discopotato03
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Thanks all , I was just curious to know if the RD block would take all the RB30 internals but allow larger bore cylinders for the same external dimensions . I've not looked at an RB block for a while so I'm not sure how much meat there is between the cylinders . SK did the workshop test that one for core thickness ?

Thanks  A .

We didn't cut one up, since it was an N/A diesel (not a turbo) the concensus was it wouldn't have much extra meat. Plus the water jacket isn't overly large anyway. so not a lot of room to move.

:D cheers :P

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