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Location:
Adelaide
Registered:
September 2003
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7M-GTE rebuild - need some help ?
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Wed, 16 February 2005 23:25
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Hi guys,
I am in the process of gathering parts/info to slowly rebuild a spare 7M-GTE motor for my Mk2.
I have a source of Forged pistons at a good price, already have ARP Studs, MHG and a spare head that can be ported and tidied up.
The parts to rebuild : rings, bearings and VRS kit, I'd like to know who is recommended (brands) and who has had problems if any.
I know there have been some comments about Gapless rings causing problems, but has anyone had any issues with the following brands ?
Rings :Toyota ($287), Hastings ($105 - $139 supplied by Precision), one place said that Chrome rings were recommended by Precision
Bearings :Toyota ($375 - Main, $221 - Rods), ACL ($70 - main, $50 - Rods), King ($103 - Main, $62 - Rods)
VRS Kit :Toyota ($611), ACL ($239), Permaseal ($270)
Any comments/recommendations of suppliers
Help would be appreciated by the M gurus such as Allan, Ed_MA61, GT et al
Thanks in advance
Michael B
[Updated on: Wed, 16 February 2005 23:36]
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: 7M-GTE rebuild - need some help ?
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Wed, 16 February 2005 23:54
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Don't use Total Seal (read Total Leak) Gapless rings.
There is also something peculiar with the 7M block metal. It needs a different hone pattern. Chat to Ed or Stenno...they have the good oil on this.
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Location:
Melbourne
Registered:
May 2002
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Re: 7M-GTE rebuild - need some help ?
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Thu, 17 February 2005 02:40
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make shure the head has a smooth finish (slow feed) use ARP studs for everything as far as your wallet can strech,
get everything crack tested and fully balanced
if no MHG go for a toyota one, use acl for all other gaskets/barings (check sizes before fitting)
use the rings that your piston supplyer recomend.
gapless rings are gay, get a file back set and do the job properly
what are you building for, dyno queen - low comp hi boost or street - mid comp mid boost?
an engine is only as good as the prep work, be surgical clean take your time, trial fit (save that old compressed head gasket), use quality products (not allways the most expencive)
buy a die grinder clean up the ports and manifolds,
lube all baring surfaces with engine oil or moloubume stuff (little yellow tube with twist off top and green writing from memory)
get the head shop to helicoil your exhaust manifold studs.
block off the water heating lines for the throttle body, replace the turbo oil feed steel pipes with braided lines.
use that gold silicon stuff on your exhaust manifold gasket, spray can of hylomar on the head gasket, use soft seting gasket cement on all other gaskets.
pray to the engine gods
prime the oil system before starting engine
enjoy! a nice tightly built engine dosent enter its prime till about 5000/10,000 km in
Allan
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Location:
Adelaide
Registered:
September 2003
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Re: 7M-GTE rebuild - need some help ?
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Thu, 17 February 2005 02:48
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Phew !!
Thanks for the hints Allan.
The engine is aimed at being a very relaible strong streeter that will do some track work as well as hills work. It will not be a daily driver, and the target is about 200 rwkW RELAIBLY. (this will achieve a better power/weight ratio than the current Z Series HSV's, so should be ample  )
I have a MHG (as well as 2 spare composites...)
I'd have done most of the things you recommended, but will make sure that they are all done.
Cheers
Michael B
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Location:
Melbourne
Registered:
May 2002
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Re: 7M-GTE rebuild - need some help ?
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Thu, 17 February 2005 02:52
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then i would go for a piston design mirroring the NA piston and go crazy smoothing the chambers and piston tops, thats my plan i cant say it will work for shure with the 7m-gte but has worked with other engines.
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Location:
Melbourne
Registered:
May 2002
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Re: 7M-GTE rebuild - need some help ?
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Thu, 17 February 2005 02:57
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p.s 200rwkw is a little bit of a low target, if you stick a moderen compressor wheel in the ct26 with your larger intercooler and so forth 300 would be more like it.
Allan
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Location:
Adelaide
Registered:
September 2003
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Re: 7M-GTE rebuild - need some help ?
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Thu, 17 February 2005 03:12
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| Allan wrote on Thu, 17 February 2005 13:27 |
p.s 200rwkw is a little bit of a low target, if you stick a moderen compressor wheel in the ct26 with your larger intercooler and so forth 300 would be more like it.
Allan
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The pistons I am looking at are Arais forged units, and their catalogue indicates that they are either 8.9 or 9.0
:1 and std bore.
The MHG that I have is a Cometic unit and is 0.051" thick (stock is 0.056" I beleive ?)
The turbo will be a T04B cored CT26, with a Super V trim compressor wheel (I believe that it is basically the same as a 57 trim) and a P trim turbine (so the exhaust has been bored out as well).
The 200 target was one that should be more than enough to embarass many cars, and still give scope for further increases when I get bored with that level.
Some more grunt should also be realised with the fitment of the LS1 MAF (& MAFT) in place of the std AFM !!
Cheers
Michael B
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Location:
Melbourne
Registered:
May 2002
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Re: 7M-GTE rebuild - need some help ?
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Thu, 17 February 2005 03:15
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any reason why you didnt go the 1uz airflow meter?
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Location:
Adelaide
Registered:
September 2003
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Re: 7M-GTE rebuild - need some help ?
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Thu, 17 February 2005 03:36
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| Allan wrote on Thu, 17 February 2005 13:45 |
any reason why you didnt go the 1uz airflow meter?
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LS1 MAF is bigger, and the MAFT gives the ability to tune better than the SAFC and is cheaper and I can run any size injector up to 1040cc without major issues. And the LS1 MAF is nice and cheap through work !!
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Location:
Australia
Registered:
September 2002
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Re: 7M-GTE rebuild - need some help ?
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Thu, 17 February 2005 08:47
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| Allan wrote on Thu, 17 February 2005 13:27 |
p.s 200rwkw is a little bit of a low target, if you stick a moderen compressor wheel in the ct26 with your larger intercooler and so forth 300 would be more like it.
Allan
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300KW is stretching it 250-270 at the very most at 20psi
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Location:
Australia
Registered:
September 2002
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Re: 7M-GTE rebuild - need some help ?
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Thu, 17 February 2005 08:49
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| bbaacchhyy wrote on Thu, 17 February 2005 14:06 |
| Allan wrote on Thu, 17 February 2005 13:45 |
any reason why you didnt go the 1uz airflow meter?
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LS1 MAF is bigger, and the MAFT gives the ability to tune better than the SAFC and is cheaper and I can run any size injector up to 1040cc without major issues. And the LS1 MAF is nice and cheap through work !!
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What is the biggest diameter the MAF comes in, I am currently running a VPC but the tuneability of the MAFT sounds good
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Location:
Adelaide
Registered:
September 2003
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Re: 7M-GTE rebuild - need some help ?
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Thu, 17 February 2005 20:38
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| HKS_TRD wrote on Thu, 17 February 2005 19:19 |
| bbaacchhyy wrote on Thu, 17 February 2005 14:06 |
| Allan wrote on Thu, 17 February 2005 13:45 |
any reason why you didnt go the 1uz airflow meter?
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LS1 MAF is bigger, and the MAFT gives the ability to tune better than the SAFC and is cheaper and I can run any size injector up to 1040cc without major issues. And the LS1 MAF is nice and cheap through work !!
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What is the biggest diameter the MAF comes in, I am currently running a VPC but the tuneability of the MAFT sounds good
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In the States, a 3" one is common, and that is what most of them are using, but you can also use a 3.5" one from the LS1 (alloy body), or there is a 3 5/8" from the current LS1/LS2 (plastic body).
Cheers
Michael B
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Location:
Melbourne
Registered:
May 2002
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Re: 7M-GTE rebuild - need some help ?
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Thu, 17 February 2005 23:19
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linkage for the maft?
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Location:
Adelaide
Registered:
September 2003
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Location:
Australia
Registered:
September 2002
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