Cummins 6BT Conversion...

[Jdmackay]

Hey everyone,
Sorta new to the forum ! i have purchased a GQ tb4.2 manual and i think its time to do a conversion. I have done some research on the td4.2 and how everyone raves about them in GQ's. (apart from weight, length etc.) these 6BT's are pretty damn awesome. So my question is that if anyone has done this conversion or been around when someone else has and know if it is do-able without crazy amounts of mods in a GQ body ?
Thanks,
-J

[Stropp]

hi mate, search in the search funtion up the top right hand side, im sure i have seen someone on here with one and it was in perth too.


Hey everyone,
Sorta new to the forum ! i have purchased a GQ tb4.2 manual and i think its time to do a conversion. I have done some research on the td4.2 and how everyone raves about them in GQ's. (apart from weight, length etc.) these 6BT's are pretty damn awesome. So my question is that if anyone has done this conversion or been around when someone else has and know if it is do-able without crazy amounts of mods in a GQ body ?
Thanks,
-J

[Stropp]

http://www.nissanpatrol.com.au/forums/attachment.php?attachmentid=5293&stc=1&thumb=1&d=1307047524 try this but it is a gu

[Jdmackay]

Thankyou !

[drz400y]

If you get an auto motive spec b series with an sae 3 bell if can cut down a lot of head aches. They are an awesome engine but can be a bit noisey for some under the bonnet

[Jdmackay]

haha yeah mate, more keen on the output of these cummins, would be a bit of a rare find for some if i did it and sold it too ;)

[BigRAWesty]

My brother has a 6bt in his shed that he's slotting into his 80..
I have read they need a body lift as they are quite a tall engine..
Long stroke so slow rpm..
Have also read the you'll need to decrease the drive ratios..
So like instead of stock 4.1's you'll need to drop to 3.9's to get top end speed..

[drz400y]

Governed rpm of a 6b is 3400rpm max. But this is dependant on spec with 2800rpm being much more common. So definitely would require diff gears

[BigRAWesty]

Governed rpm of a 6b is 3400rpm max. But this is dependant on spec with 2800rpm being much more common. So definitely would require diff gears
Have read you can get a different gov and pump to get it to 4000 rpm.. but yea why??

[drz400y]

Marine spec b has a governed speed around 4K, but they also have balance shafts fitted, not possible with an automotive spec sump as the balance shaft housing sits below the crank. Not sure I'd turn a stock internal b to 4K. Would be nice to have the 6BTM but, 380hp, 800ftlb out of the box.

[BigRAWesty]

Marine spec b has a governed speed around 4K, but they also have balance shafts fitted, not possible with an automotive spec sump as the balance shaft housing sits below the crank. Not sure I'd turn a stock internal b to 4K. Would be nice to have the 6BTM but, 380hp, 800ftlb out of the box.

Yea there figures are crazy..
My brother use to work a damler Chrysler in Adelaide and the motor that he bought was rebuilt by his mechanics and then traded in after 1000 hours..
Think he said he got it for $3g.
They dyno tune em..
His went close to 1000ftlb.. crazy as..

[Jdmackay]

yeah they are bit of a torque powerhouse ! (i definetly would not upgrade much as 800ft/lbs) from what i have read the nissan gearbox's wouldnt hold up to these things ?