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Discussion Starter #1
just found this on outers for those looking for a stroker kit for a td42.
this is all the work of matt at united fuel injection. hopefully he can chime in here and add a bit more info if he wants

Stroker kit TD42 4.45 litre finished which includes: stroker crank, custom made forged connecting rods/pistons/piston pins.

Bore I kept STD boe (96 mm) due to heat tranfer capacity and block strenght when running hi boost. Volume went fom 4.2 --> 4.45 litres

Crank is stroked, balanced, knife edged, shotpeened, chamfered, micro polished etc. Knife edging will give the fastest crank accelaration in the 3000-6000 rpm range. Rember TD42 have a 10 litre oilcapacity. Good thing for reducing parasitic drag due to engine oil.

Stroke increase from 96 mm --> 102 mm. This is on my analyses and measurement without hitting the rods to the block I hope.

Increase in stroke will give tremandous torque on a diesel.

Compression ratio remains 22:1 and rocker ratio will 1.8 roller. Piston is machined for more valve lift. Also extra oildriling for more oil to the piston pins and re-inforced piston top for hi boost.

Connecting rods are forged H-beam with ARP hi strengt bolts.

Gudgeon Pin (psiton pin) are custom made from very strong TOOL STEEL.

Any interest, please let me know.

and some pics
UGOTNUFN said:
 

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Pass the Popcorn
Nissan Datsun Patrol
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x2 on Oze's post!!
 

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"Toxic Personality"
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If this is a..... "look what I have but don't sell" thing I'm already over it.

If it's available for sale-delivery..... I'm interested,
 

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no i dont think a price has been released by matt at this stage neither do i know if he has actually assembled the engine yet either.
pretty much what you see there is all i know. just seen it on outers and thought dam my wish list just grew about ###$ but would be awesome.
as i said hoping he chimes in here during the week sheds a bit more light for us all.
 

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"Toxic Personality"
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This will also change the way the td42 makes boost, normally inefficient turbos might be quite handy... Gtx3071
 

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Until someone makes a 24 valve head for the 4.2 I dont really see the point.

Yes it will make more torque lower down but 6000rpm with 40psi on the current head I would like to see.
 

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Rogue
nissan gu patrol
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Until someone makes a 24 valve head for the 4.2 I dont really see the point.

Yes it will make more torque lower down but 6000rpm with 40psi on the current head I would like to see.
Thats what I has thinking, major head development needs to be done before you can expect any efficient high powered TD42.
 

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Tooling wouldnt be the problem if you used CNC. from a solid billet. Even getting such custom billet sizes isnt a problem anymore as you can order them through specialist metal suppliers that get a chinese steelworks to punch them out chop chop.

The design of a head with 24 overhead valves driven of a single in block cam to me would be the hard part from a design perspective. Just depends on how you fit everything in and to what extent you would need to design more parts (such as injector lines).

If you wanted to drop the compression ratio and go DI then heres the chance.
 

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Rogue
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Hardest part would be setting up the chain drive, injection and still fitting the original head bolt pattern.
 

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Tooling wouldnt be the problem if you used CNC. from a solid billet. Even getting such custom billet sizes isnt a problem anymore as you can order them through specialist metal suppliers that get a chinese steelworks to punch them out chop chop.

The design of a head with 24 overhead valves driven of a single in block cam to me would be the hard part from a design perspective. Just depends on how you fit everything in and to what extent you would need to design more parts (such as injector lines).

If you wanted to drop the compression ratio and go DI then heres the chance.
Don't you mean crank? Think along the lines of keeping it simple, would you use clearances off the old head, and possibly scab a twin cam design off something like the rb25 or tb48, and simply bend the desighn to suit? would it affect balance much you think if we go from gear drive to belt for timing? Probably negligible,
 

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CNC cant do oil and water galleries. A lot harder then you make it out.
That's what I thought, that's why I asked about machining, have you had any experience with custom fabricated heads? I could probably design one that would work, but the tooling I can't see being easy, but I don't know anything about that,

I'll have a quick look on google for a head maker.
 

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Don't you mean crank? Think along the lines of keeping it simple, would you use clearances off the old head, and possibly scab a twin cam design off something like the rb25 or tb48, and simply bend the desighn to suit? would it affect balance much you think if we go from gear drive to belt for timing? Probably negligible,
With the head, almost every other engine running 4 valves per cylinder uses an OHC of some description.

Short of making a whole new block, it would still be easier to use the original cam and pushrods but alter the valve arrangement so that two exhuast or two intake valves are driven off the one pushrod.
 

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nissan patrol gq
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If you put your head to it nothing is impossible. think outside the box.
Ye, but this box we're discussing looks like it's getting very expensive really fast.

Out of curiosity, would it make much difference putting a stroker kit into a NA TD42? I'm just curious what type of difference stroking a non turbo diesel would make to it's power and torque.
 

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SUI GENERIS UTE
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Ye, but this box we're discussing looks like it's getting very expensive really fast.

Out of curiosity, would it make much difference putting a stroker kit into a NA TD42? I'm just curious what type of difference stroking a non turbo diesel would make to it's power and torque.
Like the old saying there is no replacement for displacement never, even small amounts always adds torque and power in the same block, it adds torque and power in the same spot..
 

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Ye, but this box we're discussing looks like it's getting very expensive really fast.
Not my money ;)

Casting is a cheap way to make lots of bits cheaply. Precision machining is a way to make small amounts of parts without going to the expense of setting up a casting process.

Just cause heads are production cast in a single piece doesnt mean you can take that casting a break it down into two or three horozontal slices. 1 for the actual cylinder caps and valve guides, 1 to take the coolant jackets (valve train mounted on top of this) with oil passages drilled through it, 1 enclosure and 1 valve 'cover'.

Im in the process of designing a modular steam engine atm using similar ideas.

But then again, if it got to the point of putting a stroker into a td42 id be getting a cummins 6bt, GM 6L80E, jegs adaptor for donk to box and a marks adaptors kit for the box to tfer.

Might be a bit of firewall and floor pan chopping but.
 
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