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186 rebuild, Oracle advice

Started by claysummers , Feb 26 2021 05:29 PM

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#276 claysummers

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Posted 18 December 2021 - 07:58 AM

Thanks fellas, I’m on it.


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#277 Bruiser

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Posted 18 December 2021 - 09:19 AM

1.6 ratio rockers will pull a bit harder against the studs

#278 S pack

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Posted 18 December 2021 - 09:25 AM

1.6 ratio rockers will pull a bit harder against the studs

Agree, stick with the std 1.5:1 ratio.
 


#279 claysummers

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Posted 18 December 2021 - 09:46 AM

Yes the pushrods are 9.136" thanks. Yes ordered 1.5 ratio rockers. Don't want to put more stress on things thanks.

Three piece rocker arm. I hope I got all the bits. I suppose the roller rockers will fit under original cover? I was going to put one on with 179X2 decal.cc3b4bdb9350610ffc3a7780f7aa2e59.jpg

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#280 73SUNBURSTEXYOUWON

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Posted 18 December 2021 - 12:55 PM

Clay, Did you also check during assembly, at full lift (using a locked up hyd. or solid lifter), that the pressed steel rocker arm slot, was not smashing into the rocker stud.

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#281 claysummers

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Posted 18 December 2021 - 01:20 PM

I didn't Jaso. Just flung on the cleanest tidyest 12 I had.

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#282 claysummers

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Posted 18 December 2021 - 01:26 PM

Was going to put factory cover on with X2 decal but need the tall cover. Stripped off the black with small wire brush on the drill and clean and strip disc.f42e4b250fae6539c6e0026909733ed7.jpg

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#283 rexy

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Posted 18 December 2021 - 01:54 PM

I think in the absence of evidence that your rockers are binding on anything that you are seeing the results of fatigue from not running them with the correct preload. Every time they are activated they get a whack from the valve train and this cumulative fatigue is showing.

 

Millions of holdens have survived for ever with those stamped steel factory rockers set up correctly.


#284 I'm a Red Motor fiend

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Posted 18 December 2021 - 02:51 PM

I think in the absence of evidence that your rockers are binding on anything that you are seeing the results of fatigue from not running them with the correct preload. Every time they are activated they get a whack from the valve train and this cumulative fatigue is showing.

Millions of holdens have survived for ever with those stamped steel factory rockers set up correctly.


Yep.

#285 claysummers

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Posted 18 December 2021 - 04:35 PM

Thanks rexy yes. Slow learner. When I adjusted them this morning they all had some preload varying from zip to one turn. Going good now and roller rockers due after Christmas. Thanks to Jaso for the EH workshop manual specs. Now set to one turn of preload. 8abf7394dc5619eb621882ebae7654da.jpg

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#286 claysummers

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Posted 14 February 2022 - 02:55 PM

Finally these turned up e6c7abe8abf1d5141ba75339a6ab761d.jpg


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#287 claysummers

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Posted 24 February 2022 - 09:45 AM

Ready to adjust these after I get the battery charged up. 724a0e069c58add8eda58e1d84567749.jpg
Some of the old arms look pretty dodgy now I look at them. Pre existing damage I should have noticed initially rather than just throwing them on. They were from a mixture of old heads so who knows?666828d0c2a30d1ab01e0e389286fe49.jpgThe opposing surfaces are all fine.49070e86a794df04ad776997c18e6cd4.jpg

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#288 claysummers

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Posted 24 February 2022 - 02:23 PM

All adjusted and torqued up on the posi-locks, snuck out the back straight up to 120kmk in second, 4900rpm i think. It was sure worth the dough I threw at getting everything balanced. Revving very sweetly 8 ) 8 )


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#289 claysummers

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Posted 12 April 2022 - 12:51 PM

Engine has been running a bit fluffy at light throttle so I pulled the plugs to have a look9968d84ca1b8e3bae44fc7d3015d4b1a.jpgFront three have a fair carbon build up. The rest are a nice brown. I'm wondering if front carb is a bit rich. Champion NI 2 Y on 98 unleaded. Though they look fine, I will get some new ones. Any suggestions?

Might try leaning out the idle on front carb.

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#290 Rockoz

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Posted 12 April 2022 - 02:13 PM

Spent an afternoon at Oran Park many years ago watchin unofficial practice.

A couple of crews in particular as they were working together.

Sports Sedans from memory.

When they checked the plugs for colour it was after a run at full noise down the straight, then the engine shut off pretty much at top revs.

They towed the car back to the pit area then checked the plugs.

They had banks of plugs of different temp ranges as well as an aluminium plate loaded up with multiples of every jet size and power valve size.

 

Does the colour really matter if the engine has been idling?

 

I know it is different applications, race vs street.

 

Cheers

 

Rob


#291 claysummers

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Posted 12 April 2022 - 03:26 PM

I don’t know Rob, but the over rich idle fits with the symptoms I’m having. Now I’ve done a few miles on these jugs and settled them in I can see a few things that need fettling, like shortening the screw in one of the idle stops. The X2s are a tad agricultural but wank factor is up in my book.


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#292 claysummers

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Posted 12 April 2022 - 03:42 PM

Then again, this could be something to do with it872529acc2f53f1e3d3d5e0b4ea56ad5.jpg

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#293 I'm a Red Motor fiend

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Posted 12 April 2022 - 03:53 PM

I would pull 2 degrees timing out also.

#294 Rockoz

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Posted 12 April 2022 - 03:58 PM

New rotor and cap for sure

 

Cheers 

 

Rob


#295 claysummers

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Posted 12 April 2022 - 04:23 PM

I would pull 2 degrees timing out also.

Any elaboration on that Adam?

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#296 Bruiser

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Posted 12 April 2022 - 06:35 PM

Hiya, clay

Yep, that kinglead to rotor contact is tiptop,
surprised it isn't running worse than a bit fluffy
How old are those plugs? Even the bit outside of the head looks cruddy
Rotor, cap and plugs might get rid of the fluffies
Those crow rockers look like a good buy, too

#297 claysummers

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Posted 12 April 2022 - 09:20 PM

Hi Bruce,
Yes the Crow rockers a bit under $300 peace of mind.

I was surprised how well it was running. I got 12.5 litres/100km on a recent tank full. The plugs were from the previous motor and in it when I painted it a dark grey hence they look grotty. But they had only done nominal km in that motor.

I'm looking forward to running it after this ignition freshen up. The leads appear to be good. I suppose I could test resistance and clean them.df196ee2cd4e7e9bc90b29b9b142baed.jpg

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#298 Bruiser

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Posted 12 April 2022 - 10:28 PM

Hopefully tha will de-fluff it all and she runs perfecto

At least if you still need to you can start on the carbs
knowing the ignition is as good can be

#299 claysummers

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Posted 12 April 2022 - 10:41 PM

Could be to do with power bypass operating when it shouldn't. Blocked vacuum signal, spring, dirty etc. But the carbs were rebuilt by a reputable bloke.

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Posted 13 April 2022 - 06:57 AM

What Rob says is accurate, to read plugs you should shut down at WOT.

Looking at those though you can still see the colour change on the ground strap is too close to the thread. It should be in the middle of the apex.
Closer to the thread indicates more timing than needed for the efficiency of the head.
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