TU5J4 or TU5JP4
 

I am building the 106 up from a shell. I was looking at getting a TU5J4 but seem hard to find one so considering a TU5JP4.

First off is any one selling a TU5J4 in the northwest?

loads of TU5JP4 going so should I just do that, Any thoughts?

Witch would be more reliable and any pros or cons of both.

I have two spare J4's, depends what state/condition you want them in....

The JP4 had bigger valves, If i remember right. Yet milder cams. I think the inlet manifold was also different, not in a good way.
I'm scratching my head, but a hybrid of the JP4 with J4 cams & inlet was a slightly worthy upgrade in the day. Although I think the inlet manifold needed to be re-drilled to the head.

Depends on what you building I guess, which one suits budget/application/quality etc.

Hi. Is the jp4 the later motor with black plastic cam covers and j4 the Saxo vts motor?

Yep thats right. Youll need to swap the sump, some sensors, and inlet manifold to the jp4 to use in a Saxo. Youll need to drill and tap some holes in the head to fit the j4 inlet, but its nothing difficult.

and refit vts cams -not jp4 cams
although to be fair the 110bhp jp4 makes is at 1000rpm less than the vts makes its 120 --so more mid range torque an at same rpm vts makes less power
so in driving it may actually feel quicker with std gearing

remember "torque turns wheels --bhp sells engines"