Thread: 12 valve /24valve

Toyota landcruiser vx 80 series turbo
I don't understand the 12v/24v thing
Could some one who knows explain this in simplemans terms please, ending with which one is better.
Thanks.

Mines a 24 valve and it goes pretty good. I'll be following this too. I've wondered what the deal is

The 24v has tiny bit more grunt as standard but if you mod them harder with a bigger turbo etc the 24v delivers more grunt.

Also bragging rights/snobbery

24v (1HD-FT) has about 6Hp more and 20Nm more torque that the 12v (1HD-T)

Thanks for the replies so far.
so , is it a deal breaker, 6hp/20Nm doesn't seem that much in the big scheme if a bloke wasn't going to go away from factory consideration?

less than 5% more.

Not its not, considering how much extra some people want to charge because of the extra valves

They also redid the big end bearings in the 24V so you don't need to change those every time you do the cam belt like the 12V.

That one is the deal breaker.

Originally Posted by gadgetman

They also redid the big end bearings in the 24V so you don't need to change those every time you do the cam belt like the 12V.

That one is the deal breaker.

Or every 20 thou if the engine is making power.

Every 20 thou? Truely

Originally Posted by gadgetman

They also redid the big end bearings in the 24V so you don't need to change those every time you do the cam belt like the 12V.

That one is the deal breaker.

Huh?, what's the correlation between big ends and cambelt?.
I did 4 cambelts on mine, replaced coolant, water pump, tensioner and all belts, but why the need to do big ends every 100k?.
I understood that once the big ends were done as a service improvement, that was it.
I never did mine, daily drive, never towed, oil and filter every 5thou k's.
I was told by my mate who runs a 4wd center that if the bearings hadn't gone by 150k's, they're probably not going to.
Sold it at 456 thou k's, same oil pressure and economy per tank fill as when I bought it 17 years ago.

But hey, what do I know?.

B

Originally Posted by shift14

Huh?, what's the correlation between big ends and cambelt?.
I did 4 cambelts on mine, replaced coolant, water pump, tensioner and all belts, but why the need to do big ends every 100k?.
I understood that once the big ends were done as a service improvement, that was it.
I never did mine, daily drive, never towed, oil and filter every 5thou k's.
I was told by my mate who runs a 4wd center that if the bearings hadn't gone by 150k's, they're probably not going to.
Sold it at 456 thou k's, same oil pressure and economy per tank fill as when I bought it 17 years ago.

But hey, what do I know?.

B

I'm going by the reports of owners on a couple of 4x4 forums and a mechanic or two I know. Also looking at TM ads that seemed to be a common thing 'that had just been done' ad after ad. They also seemed to be very hard on the running gear being full time 4x4, also from the same sources.

Originally Posted by gadgetman

I'm going by the reports of owners on a couple of 4x4 forums and a mechanic or two I know. Also looking at TM ads that seemed to be a common thing 'that had just been done' ad after ad. They also seemed to be very hard on the running gear being full time 4x4, also from the same sources.

Ah, forums.....

B

Originally Posted by gadgetman

I'm going by the reports of owners on a couple of 4x4 forums and a mechanic or two I know. Also looking at TM ads that seemed to be a common thing 'that had just been done' ad after ad. They also seemed to be very hard on the running gear being full time 4x4, also from the same sources.

Na if anything they are more kind on the running gear being full time all wheel drive not 4 wheel drive or 2 wheel drive.
But the bearing thing aint no myth!!!

Originally Posted by shift14

Huh?, what's the correlation between big ends and cambelt?.
I did 4 cambelts on mine, replaced coolant, water pump, tensioner and all belts, but why the need to do big ends every 100k?.
I understood that once the big ends were done as a service improvement, that was it.
I never did mine, daily drive, never towed, oil and filter every 5thou k's.
I was told by my mate who runs a 4wd center that if the bearings hadn't gone by 150k's, they're probably not going to.
Sold it at 456 thou k's, same oil pressure and economy per tank fill as when I bought it 17 years ago.

But hey, what do I know?.

B

Mine had them done 3 times in less than 100k km once as part of a full 11.5 grand recondition.

They are a pig and a poke reliability wise.

I bought mine specifically because it had had a new crank and bearings before I bought it.