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defrag010

3.4L L28 stroker

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Ok, no worries. I have no other block to compare it to, so can only call it as it is. As we never got the Maxima diesel, is it possible that it comes from an older model of something else? Info on the LD28 is not conclusive. I was led to believe that we got the diesel in some older model Patrols. Either way.... I will forge on.

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I've always wondered this too. LD28 stock bore is 84.5mm. No way you are into water at 86mm, that would make the bore wall thickness under 1mm? Diesels need to be strong and the LD is known stout. 

 

Could be a case of location as well as what car they came out of. A Patrol in S.A. is going to get more of a hard life than a Maxima in the states. 

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Not sure if this topic is no longer the flavor of the decade, but I am in the process of a very similar build with a LD28 block. Block has been bored to 89mm. Min wall thickness of 3mm. Interesting to see the wall thicknesses are in the 3mm - 5mm range. So there is some shift in the core.

If anyone is interested in this build, let me know, and I will post as things happen.

 

So, you've sonic tested after boring and have 3 to 5 mm?  

 

Yes, very interested in seeing more about this engine.  I am exploring using an LD28 block for a new engine.  My engine builder started examining the one I just sent him.  It came from a US spec Maxima.  He knocked out the front and rear freeze plugs and estimated the bore thickness at around .220". However, he notes that there are spaces between the as cast bores, meaning none of the bores are siamesed. He's going to sonic test a few of them to see what we're faced with.  IF the bores are around .220" thick, we MIGHT be able to bore to 89 mm and have .120" (3 mm wall left).  He is very doubtful...

 

Maybe those Patrol engines are different?

Edited by inline6

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I'm thinking there are at least two versions of the LD28 block, as I've seen dry-linered blocks in diesel shops before. The bores were cut a lot bigger than 84.5mm, then dry-sleeved back to 84.5mm with thick sleeves.

 

I tried to buy a few of those blocks but was unable to get the diesel shop to sell them. I then got two from maximas and they were bored to 86ish mm and hit water at the bottom of the bore. They may have simply been corroded badly too.

 

I had a plan using the LD28 block, an offset-ground LD28 crankshaft, and 4G63 rods hung on a custom piston (may have been a stock piston for a different application, I'd have to look again) that gave a 3.3L block with what I considered at the time to be desirable properties. If I could get an LD block to go 89mm, I could probably work in even more stroke...maybe even 88 or 89x90.

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My Maxima block will be machined this week and we'll see what is possible with it.  The plan is to go to wet liners.  It would be amazing if the block will take an 89 mm bore.  I don't think it will.  If we break through, we'll keep going to 88 or so mm and examine the height of the deck and the height of the floor of the block.  Should know more soon.  I wish I could get my hands on a block that would take a bore of 89 mm.  I tried looking for a Nissan Patrol diesel block on a couple of auction sites in South Africa.  Nothing on either of those.

Edited by inline6

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Howzit guys.

I know this has been a while... but I warn you that this is not a mad panic, so progress will be slow as I start to tear down my car for a full rebuild. (Another story for another day).

I am going to attempt to upload some pictures to show where I am so far on this build. Block has been bored to 89mm. I could have gone to 89.5 safely, but decided some insurance was a better idea. The crank was in the process of being machined, when the machinist was hit with bad health and nothing happened for a while. While this was happening I decided to push the envelope a little further and explore a 92mm stroke over the planned 90mm stroke. As this was going to put me in "unknown" territory and as I have already been shot down for asking "sensitive" questions, I decided against it and throw a simple pattern together to test possible/probable interference issues in the block. (LD28 block for those who have forgotten).

The results were better than expected. Not only was the pattern extremely accurate (luck more than anything) but there is zero clearance issues. It gets close in places. I would guess in the region of 1mm, but that is easily sorted out.

The piston (KA24) will be trimmed to the required height depending on the head gasket. Probably in the region of 1mm which will remove the .7mm dish.  I measured at TDC and got a positive reading of 1.89mm. The reading at BDC was 90.21. This gives a final stroke of 92.1mm. (I was stoked with the accuracy... all things considered).

Now to get the crank completed..... I will keep posting updates.

I must add that the point of this build is to see what is possible with a "modest" budget. It is not a substitute for a purpose built race motor (in a crate) from one of the big names.  :rolleyes: 

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Thanks for the update.  My engine builder recently completed making some mandrel adapter rings which, as I understand it, will be used to locate/hold the block while they bore it out..  We are going to bore both an L28 and an LD28.  With the L28, we're going to go to something like 92 mm (I forget precisely the number).  We are trying to remove all of the bore so we can examine the thickness of the deck and the bottom shelf of the bores.  This is just to provide any information that may be helpful with regard to liner design.  

 

With the LD28, we'll try to go to 89 mm, but given others experiences that we know of here in the states, we aren't giving that a high percentage of success. This is why I find your information so intriguing.  Anyway, if upon examination of the L28 bored out we see there is still promise with using a wet liner, then if we break through the LD28, we'll keep going until the bore is gone on that one also.  Then we'll have to see if we can come up with a final design of the wet liners.  

 

Thanks again for the info.  I wish I had your block.   :cool:  

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Thanks for the pics.  Your block is a V57 casting...  which has external ribbing.  You have a completely different animal there than the LD28 that came to the states.  

 

I found this image of a V07 block in another hybridz thread.  Very different even just looking at the exterior, if I am seeing this right.

 

Regarding uploading pics, look on the bottom right of the blank post area for the next post in the thread and you should see a button labeled "more reply options".  If you click that, you will get more functionality exposed including the "choose files" to upload option.

 

Maybe a group buy of V57 blocks from you is in order!

Edited by inline6

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Thanks for the upload lesson. I have attached a picture to test. ;)   If it doesn't appear... I'm still retarded.

Ok, it appears that it has worked. The caption for this picture, in case anyone hasn't read the kak previously is this. Testing the rod clearance in my 89mm x 92mm stroke LD28 block.

Seriously considering stretching it to 93mm stroke. Would require further trimming of the piston crown. 94mm is totally possible but another piston with a compression height of around 31mm would be required. To take 3mm off the top of a KA24 would be pushing it. a 2.5mm trim and a 2mm gasket would get it there too. That will give a genuine 3.5l (3508.72cc)

Bear in mind this is with the std 89mm piston. 89.5mm will bump to 3588cc and for those with nerves of steel (and deep pockets) a 90mm cut will deliver 3588cc.

post-37179-0-20060100-1461598927_thumb.jpg

Edited by Speedtripper

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Ok, so you have a friend who can source these blocks?  I am seriously interested in obtaining one.  And I might be able to get others interested in a group buy.  

 

The V57 block never came the the US from what I can tell.  Looks like it might be the version that was used for the factory supplied LD28T (turbo) as well as some industrial and marine applications. 

 

Garrett  

Edited by inline6

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..Looks like it might be the version that was used for the factory supplied LD28T (turbo) as well as some industrial and marine applications...

...I found this image of a V07 block in another hybridz thread. Very different even just looking at the exterior, if I am seeing this right...

Not my photo, but my Photobucket account (Rayaapp2's photo/vehicle/cat). If anybody does import any of these blocks, and just happens to get an oil pan like the one pictured (winged/rear sump) I would be interested in buying it. Assuming of course, you don't use it yourself...

 

In to see the stroker progress too, so please excuse the shameless plug!

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Not my photo, but my Photobucket account (Rayaapp2's photo/vehicle/cat). If anybody does import any of these blocks, and just happens to get an oil pan like the one pictured (winged/rear sump) I would be interested in buying it. Assuming of course, you don't use it yourself...

 

In to see the stroker progress too, so please excuse the shameless plug!

 

I sold a pan like that when I parted out a V07 a while back.  I would think it wouldn't be "too hard" to find.  I'll keep an eye out.  Sorry if anyone is annoyed with the digression.  We can move the theads for getting the V57 blocks to another thread?

Edited by inline6

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Update...

It appears that I have been a really bad friend! My mate sold his farm a couple of years back and I just found out. He is over 700mls away so I can be excused for that. I spoke to the new owner, and all surplus "junk" was removed when they bought. They do have a Nissan patrol with a LD28 for sale, but cannot seriously consider that option to just part out a block and a crank.  Apparently, the V57 was not an official import, but a number of these motors were brought in for conversions in Land Rovers. The net is littered with people talking about this conversion, but the posts are generally 5+ years old. I will post a couple of ads on some of the local 4x4 forums to see if I get any bites.
 

@WhitleyTune, yes the idea is to drill out the head to accommodate the larger bolts. Ran it by an engineering shop and they weren't too concerned.

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That much overbore is going to make the cylinder walls too thin I think. Hell the 89mm required for a 3.1L stroker make the walls extremely thin.

 

Yep, lots of core shifts with those blocks, checking wall thickness is essential if serious.

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Apparently, the V57 was not an official import, but a number of these motors were brought in for conversions in Land Rovers. The net is littered with people talking about this conversion, but the posts are generally 5+ years old. I will post a couple of ads on some of the local 4x4 forums to see if I get any bites.

 

I have some questions about your block.  Can you tell if the front three and back three cylinders are siamesed?  That is, are there no coolant passages between 1 or 2 or 3 and none between 4 and 5 and 6?  Instead of separated/isolated castings for each cylinder, is  each set of three connected/contiguous?  And by contrast, there are cooling passages between cylinders 3 and 4?

 

Could you post some more pictures of it when you get a chance?  Front, back, and the two sides?

 

The pistons you have mocked up are 89 mm diameter?

 

Garrett 

Edited by inline6

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