whats 1 T bits?
if you mean turbo bits
The 12HT has a different head (direct injection), obviously a different injector setup, a different pre-heating system, and piston skirt cooling. The injector pump may be different on the 12HT also, although im not sure of this.
You could probably upgrade a 2H to a 12HT engine, but youd need the head ($1000+), injectors ($500), the difference in the oiling setup ($?) plus then the manifolds and turbo, if you can find the manifolds they will be unlikely to sell them seperate from the motor. If you can find a blown 12HT with a good head (unlikely), you may be able to use the bare 2H block and build it up to a 12HT.
With regards to a chev, from what i understand they cost upward of $10k for a drive in drive out conversion. Even if you do it yourself, you will be unlikely to get out of it for much under $10k.
A 12HT is probably going to cost you $7-$8k for either a low K import with warranty or a rebuilt one. Im not sure if a rebuilder will swap a 2H for a 12HT but anything is possible. If your 2H is shagged, you are unlikely to get more than about $500-$1000 for it in an exchange deal.
Grabbing a blown 12HT is something ive been considering for an upgrade to my 2H, although you will pretty much have to buy a head since if the engine is blown, its more than likely taken the head with it (if that wasnt the part that blew). Otherwise all the 12HT stuff should bolt up to either an early or late model 2H block, so finding a blown 12HT would be very good. Im sure we are not the only ones with this idea though
With a bit of tweaking and an intercooler a 12HT is very capable of producing 150KW(flywheel) which is double the power of a factory 2H. The 80 and 100series multivalve 1HDT only produces about 150kw, although they are ofcourse capable of more.
Adding a turbo to your rebuilt 2H is also an option, and if you can find a kit at the wreckers or second hand you should be able to turbo your 2H for about $2000 with a rebuilt turbo.
A turbo 2H with intercooler and exhaust should be quite capable of up to 120kw before the indirect injected head, and lack of piston skirt cooling becomes an issue.
The rebuild is going to cost you between $3k and $4k (exchange full rebuild is about $3,850). Add a turbo for $2000 and you have a 40% gain in power for under $6k. Add a big exhaust and an intercooler for about another $500 and you should hit 120kw (60% gain).
All of these options, 12HT, turbo 2H and chev6.2/6.5 are likely to stress your gearbox and its likely that will be the next to fail. Reco exchange are $1500.
Fitting a 12HT shouldnt be very difficult at all, Few trips to wreckers for unforseen parts, and everything shoiuld bolt up and drop in.
Chev6.2 means engine mounts, gearbox adapters, change of clutch etc etc, and of course engineers signature.
If i had the cash id definantly be goingt the 12HT route with a phat exhaust and intercooler.
