72 Mazda b1600 rotary swap
talking head
Joined: Apr 2008
Posts: 2,775
Likes: 15
From: Perth, WA, OZ
oh, and PS
if the rear of the gearbox has ended up in the stock location then you can choose 2 piece tailshafts from the b2600 range which use a piston adaption of the t2 gearbox
if things have changed and you need a custom tailshaft then you may also wish to install a t2 diff head
as this is long nose and shortens the need for the two piece tailshaft
( when it is over a certain length, mazda chose the two piece to avoid the limits of tailshaft critical speed )
with the long nose " tq tube " diff setup then you can get a decent single shaft
( 3 inch thickwall with 1310 or equiv mopar uni joint )
made up that will be much cheaper than making a double
( and safer than modifying your current double )
the trick with using the t2 diff in the semi floater diff tube is to weld washers onto the end of the axles to make up for the change in lengths
now that the new t2 diff lacks the support in the middle of the 'rubbing block' found on the old b1600 diff spider pinion shaft
ie.. the axles are supposed to rub on the spider gear pinion shaft "rubbing block" in the b1600 diff
so as to share the weight load across the two opposed taper bearings at each axle end
when you put in the t2 diff ( ex IRS )
.. it lacks the rubbing block width
and so makes setting the endfloat for axles impossible
till you add washers to axle ends so that they rub on the t2 spider gear pinion shaft
the trouble is worth it,, as it brings the option for LSD
,, and much simplifies the fabrication and cost to a single piece tailshaft
if the rear of the gearbox has ended up in the stock location then you can choose 2 piece tailshafts from the b2600 range which use a piston adaption of the t2 gearbox
if things have changed and you need a custom tailshaft then you may also wish to install a t2 diff head
as this is long nose and shortens the need for the two piece tailshaft
( when it is over a certain length, mazda chose the two piece to avoid the limits of tailshaft critical speed )
with the long nose " tq tube " diff setup then you can get a decent single shaft
( 3 inch thickwall with 1310 or equiv mopar uni joint )
made up that will be much cheaper than making a double
( and safer than modifying your current double )
the trick with using the t2 diff in the semi floater diff tube is to weld washers onto the end of the axles to make up for the change in lengths
now that the new t2 diff lacks the support in the middle of the 'rubbing block' found on the old b1600 diff spider pinion shaft
ie.. the axles are supposed to rub on the spider gear pinion shaft "rubbing block" in the b1600 diff
so as to share the weight load across the two opposed taper bearings at each axle end
when you put in the t2 diff ( ex IRS )
.. it lacks the rubbing block width
and so makes setting the endfloat for axles impossible
till you add washers to axle ends so that they rub on the t2 spider gear pinion shaft
the trouble is worth it,, as it brings the option for LSD
,, and much simplifies the fabrication and cost to a single piece tailshaft
Managed to get some more work done to it.i had a 86-91 rx7 13b header that I modified so it fits the tight engine bay on the truck.also got a fd upper intake manifold ported so it bolts up directly to the s4 turbo lower intake manifold.got some dual radiator fans mounted also.heres some pics
3 row rx7 Radiator was a tight fit but got it in there.also had a radiator shop change the bottom outlet and also put the heater hose outlet on driver side.
3 row rx7 Radiator was a tight fit but got it in there.also had a radiator shop change the bottom outlet and also put the heater hose outlet on driver side.
Updates also on this
Truck is up and running
Just need to do the exhaust
Doing 2.5" stainless steel pipe,racing beat universal pre silencer and racing beat universal muffler out back.
Here's A video of first start up
Truck is up and running
Just need to do the exhaust
Doing 2.5" stainless steel pipe,racing beat universal pre silencer and racing beat universal muffler out back.
Here's A video of first start up
Last edited by turbo_dave; Nov 24, 2016 at 01:27 AM.
www.rockauto.com
Rotary Enthusiast
Joined: Jan 2005
Posts: 846
Likes: 14
From: hsv al
Turbo_dave I have been following you on instagram for about a year now. You do a ton of old school rotary stuff, I love it way more than bolting **** on FDs as you normally see on social media.
Keep up the good work!
Keep up the good work!
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