12v vs 24valve diesel engine

[Rottinn]

hi. I have an 92model of 80 cruiser and my engine broke I have an 12v 4.2 diesel engine. Does the 95+model of 24v 4.2 engine fit in my car without any changes? I´we heard that the 24v engine gives a lot more horsepowers and are better than the old ones.. How many horsepowers are they?? and how much torque compaired to the old one? I hop that somebody here can answer my questions..

 

[The Pea]

Amayama is always a fantastic source of info... if not always 100% accurate, especially on the picture side of things, but here is your info:

Engine model 1HD-T
Max.power (Net), kw(PS)/rpm 165 ps (121.36 kw) / 3600 rpm
Max.torque(Net), N*m(kg*m)/rpm 37.0 kg*m (362.85 N*m) / 2000 rpm


Engine model 1HD-FT
Max.power (Net), kw(PS)/rpm 170 ps (125.04 kw) / 3600 rpm
Max.torque(Net), N*m(kg*m)/rpm 38.7 kg*m (379.52 N*m) / 2500 rp

Engine model 1HD-FTE
Max.power (Net), kw(PS)/rpm 205 ps (150.78 kw) / 3400 rpm
Max.torque(Net), N*m(kg*m)/rpm 44.0 kg*m (431.49 N*m) / 1800 rpm

How did you actually manage to break that engine????

 

[lacruiser]

My understanding is that the FT engine was developed to reduce emissions. Off-boost throttle on the T engine gives big puffs of black smoke, but with the 24 Valves on the FT motor, and hence better breathing, that off-boost black smoke is greatly reduced.

Also, they are supposed to deliver excellent fuel economy, especially on-road. Which makes sense if you look at the torque peak, 2500 RPM, which is a nice cruising speed on highway.

But you notice you'll pay for it with reduced offroad performance at lower rpm. the T motor peaks at 2000 RPM which is nice for crawling up nice steep hills at low rpm, you'll have to get the revs up quite a bit more to do the same thing with the FT motor.

my T motor pulls like a mule at around 1500. If I can hook up the tires, it would climb straight up a wall. I don't think the FT motors will do that.

 

[denis]

lacruiser is correct, everything happens past 2000rpm on the FT whereas on T when cruising you seldom have to go above 2000 except for top speed. The good thing is that the IP can be adjusted to offset the problem on the FT at the expense of some black smoke. At low revs a 24V engine in inherently inring ferior to its 12V counterpart as far as breathing goes.
There are a few minor wiring differences like the presence of an EGR system, and a glow screen instead of glow plugs, but the mechanical part is mostly a bolt-on deal.
I have a 60000mi -FT waiting for a swap into my 1990 -T, then I'll see for myself if the fuel economy improvement still exists with an adjusted fuel pump and a 1k-2k driving style.