Piston pitting

[Itacud916]

Does anyone know if there will be any issues with fuel lines, and exhaust (not headers) with swapping from a 1hz to 1hdt?

 

[Itacud916]

What about ceramic coated pistons? Will that increase the thermal stress on the other components like the head and valves?

 

[GTSSportCoupe]

What about ceramic coated pistons? Will that increase the thermal stress on the other components like the head and valves?

The intent on ceramic coated pistons is to insulate the piston a bit more from combustion heat. No, it doesn't increase thermal stress on other components in any significant way. Ceramic coating your pistons would have done nothing to prevent the problems you had with your 1HZ - because your problem started in the cylinder head. However in a direct injection motor (like 1HDT) the pistons experience more heat than an indirection injection motor (in a direct injection motor the piston contains the entire combustion chamber/bowl). So there might be some benefit there. That said Toyota's factory made 1990+ 'turbo' pistons are usually very good. As long as you have the engine tuned right, you won't have a problem. I think around 1992 or so they revised the 1HDT piston to be even better.

 

[Itacud916]

The intent on ceramic coated pistons is to insulate the piston a bit more from combustion heat. No, it doesn't increase thermal stress on other components in any significant way. Ceramic coating your pistons would have done nothing to prevent the problems you had with your 1HZ - because your problem started in the cylinder head. However in a direct injection motor (like 1HDT) the pistons experience more heat than an indirection injection motor (in a direct injection motor the piston contains the entire combustion chamber/bowl). So there might be some benefit there. That said Toyota's factory made 1990+ 'turbo' pistons are usually very good. As long as you have the engine tuned right, you won't have a problem. I think around 1992 or so they revised the 1HDT piston to be even better.

thanks, the reason I asked is cause I’m looking at going to the 1hdt and was wondering if it’s worth getting the fancy pistons. Wanted to make sure it wouldn’t effect the longevity of the other parts

 

[roscoFJ73]

They made 3 versions of the 1HD T piston, just get the last version. Its probably all you can buy now. 1HD T can do 600000klms on standard parts.

 

[Itacud916]

Got the block out and stripped, waiting on parts to start putting things together. should I worry about trying to change fuel and injector lines? I know the 1hdt has slightly bigger lines but not sure it’ll matter.