For Sale NZ 2.7 litre stroker motors

6A13TT TYPE S

3 AYC Bars
Lifetime Member
Location
New Zealand
First Name
Adam
Drive
1999 Legnum VR4 Type S
I have block here which I'm rebuilding for Alex so I decided to ultrasonic thickness test the bores over smoko break. The bores were bloody thick! It looks like we could easily go 3mm oversize without having bore wall thickness issues.
Combining 3mm oversize with 3mm stroker crank gives 2793cc!

Now begins my hunt for 84mm pistons with the right compression height ...
 

thatjdmguy

Hesitantly Boosting
Location
sydney
First Name
michael
Drive
Vr4
just wondering what the weight of this new rod / piston combo will be compared to the OEM parts ?
and also the rod / stroke ratio
 

6A13TT TYPE S

3 AYC Bars
Lifetime Member
Location
New Zealand
First Name
Adam
Drive
1999 Legnum VR4 Type S
I havent weighed it yet. Pistons will be lighter than stock. By the time I machine the nissan rods to suit the honda pistons and mitsubishi crank it will probably be stock weight or lighter than stock.

R/S of the stroker is 1.63:1
Stock R/S is 1.71:1
R/S of the nissan is 1.58:1

Also as mentioned above I've found a piston which will work at 84mm bore 2 different dish options big dish will give 8.77:1 compression and small dish will give 9.99:1
Definatly not as cheap as the OE toyota pistons but they are readily available.
 

thatjdmguy

Hesitantly Boosting
Location
sydney
First Name
michael
Drive
Vr4
thanks for that adam,
will you also be doing a new cam regrind to go with this stroker kit aswell ?
or are your current regrinds good enough
 

6A13TT TYPE S

3 AYC Bars
Lifetime Member
Location
New Zealand
First Name
Adam
Drive
1999 Legnum VR4 Type S
My cam regrind is as big as you can go without running out of lifter preload. Can grind more off but then you have to shim the lifters and your rocker geometry gets all up the piss.

I do offer custom made billet camshafts though for those looking for larger profiles. And this allows large profiles to be used on stock basecircle size (that reminds me! I haven't made a thread about porting and billet cams etc on my trader page yet )

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6A13TT TYPE S

3 AYC Bars
Lifetime Member
Location
New Zealand
First Name
Adam
Drive
1999 Legnum VR4 Type S
Received the first crank back from offset grinding today.
Its only rough ground to 0.005" oversize.
I took it before the finish grind to chamfer the oil holes, as grinding the journal 3mm smaller removes all the factory chamfers.
tmp_13074-20170117_173102-808855081.jpg



As you can see the jornal hasnt quite cleaned up all the way but it will on the finish grind.
tmp_13074-20170117_1747441305429708.jpg



I also removed all the gallery bung ball bearings. Just weld a big knob onto the ball bearing, the heat of welding shrinks the ball making it loose in the hole and the blob of weld allows you to get some pliers and yank them out.
tmp_13074-20170117_1740031449228755.jpg
tmp_13074-20170117_173944-122398737.jpg
tmp_13074-20170117_1740231886482463.jpg
tmp_13074-20170117_1745341997587146.jpg


From this angle you can see that all the materal has been ground off the inside of the journal, not the factory undercut is still there on the top of the image but not the bottom. This is how the stroke is increased.

tmp_13074-20170117_174817-1279172537.jpg


And here you can see the oil hole with no chamfer, to having a chamfer then finally the teardrop which helps drag oil out of the hole into the bearing.

tmp_13074-20170117_174840-1602437355.jpg
tmp_13074-20170117_1802441799603429.jpg
tmp_13074-20170117_204723-508810539.jpg


Now I've done my part im going to drop the crank back off to get finish ground tomorrow morning and then begins the saving for conrods and pistonsto put a short block together.
 

jungle

3 AYC Bars
Lifetime Member
Location
QLD
First Name
Simon
Drive
1 PFL & 1 FL Legnum
What's the plan for head gasket with 84mm bore?
 

6A13TT TYPE S

3 AYC Bars
Lifetime Member
Location
New Zealand
First Name
Adam
Drive
1999 Legnum VR4 Type S
Either getting cometic to make some from a drawing I will do or gas ringing the block and using copper to seal oil and water. Only thing is gas rings are fucking expensive.
 

jungle

3 AYC Bars
Lifetime Member
Location
QLD
First Name
Simon
Drive
1 PFL & 1 FL Legnum
Either getting cometic to make some from a drawing I will do or gas ringing the block and using copper to seal oil and water. Only thing is gas rings are fucking expensive.
Ok, keen to know the ins and outs of bits required to make this bottom end happen
 

6A13TT TYPE S

3 AYC Bars
Lifetime Member
Location
New Zealand
First Name
Adam
Drive
1999 Legnum VR4 Type S
First things first is building a 0.5mm overbore engine with the stroker crank to make sure the 3mm ground off the crank to stroke it hasnt adversely effected its strength.
I.e no point sinking money into getting custom gaskets made and buying 84mm pistons if the crank is going to be rubbish. Unfortunatly that requires a chassis (or loom/ecu/turbo/fuel system for tje engine dyno) capable of running an engine at its limit to test this sort of thing

Once I have my car setup and running swapping motors in and out is easy. Its just the thousands of dollars of parts which I need to make a complete system, ecu, injectors, fuel system, fittings, loom and connectors etc etc which I can't just make myself which is holding me back at the moment.


Good things take time ;)
 

jungle

3 AYC Bars
Lifetime Member
Location
QLD
First Name
Simon
Drive
1 PFL & 1 FL Legnum
Cool, I'm keen on the 94mm piston version. So I'll be following intently
 

6A13TT TYPE S

3 AYC Bars
Lifetime Member
Location
New Zealand
First Name
Adam
Drive
1999 Legnum VR4 Type S
As much as I'd like to get stuck into it asap, I just cant afford to. So don't hold your breath.
But it'll get there eventually need to liquidate some of the random engine shit I have laying around to help fund this nonsense..
 

jungle

3 AYC Bars
Lifetime Member
Location
QLD
First Name
Simon
Drive
1 PFL & 1 FL Legnum
W
As much as I'd like to get stuck into it asap, I just cant afford to. So don't hold your breath.
But it'll get there eventually need to liquidate some of the random engine shit I have laying around to help fund this nonsense..
Well hurry up farking, I might just build one myself when I come back from my holiday
 
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