New Head or Rework the old one

[PJHarps]

hey guys i have a TB45 and im having the same problems as a lot of other people and as suggested by threedogs and had suspected myself it looks to be the head.

My question is should i buy a brand new head with valves etc ready to drop straight in (1500-2000 dollars) or should i have my head reworked as i have a friend whos father can redo it valves the lot for 700 bucks. i am not doing the work but getting a mech to do it who said the alloys in the old head my be fatigued and warp again in the next few years so that steers me towards new but the dollars steer me the other way as im an apprentice money is tight.

Thanks in advance
Paul

[Bigrig]

Hmmm - isn't the head on the TB45 (and 48) less able as it were to be machined due to walk thickness? I had my TB42 head machined and opened up the chambers, but that added about 21cc and left about 8-10mm of wall - I was I the understanding the 4.5 was not as able to be machined (which will lower compression also - the reason I did it for the turbo)??

Happy to be wrong mate, just double check it can be done (as in, worthwhile to be done weighing cost v benefit) before laying out your hard earned ...

Good luck with it either way ...

[threedogs]

The old rock and a hard place question. If you're able to buy new do they have gas heads???

[PJHarps]

yeah running gas

[PJHarps]

not sur if they have gas heads i will be chasing it up to find out as i really only run petrol when it starts and when i run out of gas so its on gas 99% of the time

[Bob]

Try
Wave Hill Engine Services in Lilydale Vic. Google Wave Hill Engine

Here are there specs for a reconditioned TB45 Head

FULLY RECONDITIONED Nissan TB45 cylinder head
Set up to our Turbo and High Torque LPG spec's.
We start with a good secondhand cylinder head , then ,
Hardness test , Pressure test , Crack test , Strip , Chemically clean acid dip ,
K/Line valve guides , Serdi 3 way cut seats ,
Serdi flycut combustion chamber to unmask valves , Serdi throat ports ( also known as pocket port )
Second hand Valves , Valve springs , Retainers , Collets and spring seats are hot tank acid dipped
Valve are buffed , Valve stems linished , Kwikway reface valves , Kwikway tip valves
Comec machined with Diamond tip , final cleaned for assemble , valve spring pressure checked ,
Assembled with new valve stem seals

[PJHarps]

did you mean cave hill engines. i have called them and more then likely buying 1 of their high torque lpg spec heads tomorrow or the next day hopefullly it will fix my dramas and give that bit extra

[threedogs]

think thats the right choice, gives you warranty too I would think, Gas kills motors IMO. but S/S inserts etc will see it last a bit longer.
Turbo next? big power

[PJHarps]

yeah i do wanna turbo it but i will have to look at the cost. i will be fitting a snorkel and exhaust next though i think as thats a fair bit cheaper to start with thanks for they ideas and lets hope she is good after the triple bypass

[The BigFella]

dont agree with you TD on lpg wrecks engines, mine has covered 556,000k's now and still all original except for starter motor, power steering pump, alternator and the like.
The engine has only just started to show those tell tale signs of needing attention, has developed a slight miss at idle and starting to backfire on the rundown when the throttle is opened.
All unleaded cars are suitable for lpg these days, remember unleaded is a dry fuel like lpg.
If your hesitant you can run an upper cylinder lube like flash-lube for peace of mind, I do,,,,,,,,,,,,,,,,,,