Rebuilt 1HZ
Submitted: Sunday, Jan 31, 2021 at 06:34
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Chop 1961
Hi, just had a major rebuild done on my 80 series, new genuine head, Spool conrods, turbo ceramic pistons, camshaft re-ground to turbo specs, crank x-rayed, bigger injectors, refurbished injector pump with compensater, turbo kit from SMS, 5 core radiator, front mount intercooler, flywheel and clutch, probably something ive forgotten (its an age thing) motor has been designed to run between 18-23psi but will be set at 18. Everything that i could use has been geniune, which is why when it come to filters i wanted genuine. I have done a bit of reading on the internet and have learned a few things. If it says Genuine Toyota on the red and white box there is a fair chance it arnt. Them boxs of 10 filters on ebay included. If also there is a letter T on the end of the part number that stands for Thailand. Newtown Totota filters are genuine I believe, $50 each but piece of mind
Reply By: Member - shane r1 - Monday, Feb 01, 2021 at 13:14
Monday, Feb 01, 2021 at 13:14
Great to hear of someone doing a good engine rebuild including getting some more performance out of it. Should be good!
You say you haven’t balanced/weighted. I hope that doesn’t cause you grief.
I had a mate with a Holden 308 that he and a mechanic mate had rebuilt with yellow terra heads and upgraded camshaft. The thing would not rev , it was crap. I don’t know what was really wrong with it . But could have been the balance?
But. I had a 253 built with a mild cam and balanced /weighted , standard heads etc and it just loved to rev , outdid that 308 easily!
AnswerID:
634931
Follow Up By: Chop 1961 - Monday, Feb 01, 2021 at 15:34
Monday, Feb 01, 2021 at 15:34
It just goes to show then maybe how a better balanced motor may rev quicker and smoother, its bit out of my arena. But i did do some reading last night on these Spool conrods and everything was positive so far from engine builders which is a good thing, and the pistons are genuine turbo which were sent away to be ceramic coated, i have no idea what that process is, it would be great if the ceramic was applied and then each piston weighed? I might google the process later
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912355
Reply By: RMD - Monday, Feb 08, 2021 at 16:08
Monday, Feb 08, 2021 at 16:08
Chop,
Just curious so asking a question or two. The new head, is it a glow plug head, ie indirect injection, or a turbo head, direct injection?
I have this vision from what you said, for it to have and indirect inj head with now turbo pistons. Normal comp ratio for indirect is around 22:1 and turbo around 16to 18:1. If indirect head and turbo pistons is the comp ratio now quite a degree lower than normal? If so, it will make lighting the injection spray fairly difficult in cold weather. The high turbo boost pressure will compensate for lower comp ratio when running though. Just cold starting may be an issue. Perhaps I am seeing something not there!
Cheers
RMD
AnswerID:
635005
Follow Up By: Chop 1961 - Monday, Feb 08, 2021 at 18:46
Monday, Feb 08, 2021 at 18:46
Im not sure RMD, i do know the head is a genuine 1hz, its in my mecanics hands, hes been building cruiser motors for most of his life, everyone talks highly of him so i guess i will have to wait and see.. you have got me thinking but. One good thing is, it dosnt get cold up here, it should be up and running in the next few weeks so i will give an update, cheers
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Follow Up By: Chop 1961 - Tuesday, Feb 09, 2021 at 11:03
Tuesday, Feb 09, 2021 at 11:03
RMD, i have been reading trying to further understand and think what you are maybe thinking is that by using genuine turbo pistons which have the explosive chamber built into the top of the piston and then using the 1HZ head which has the explosive chamber built into it, it will be more area hence Lower compression? It does make sence. I have been reading up on the topic and there is a mob selling turbo kits for 1HZ which include genuine 1HDT pistons if i read it correctly, i think they were called
Norseman? Something like that, and I believe my kit came from a company called SMS Diesel down
Brisbane way, there might be someone on this site who could inlighten us
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