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304 355" build thread

Deuce

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If I remember correctly, this is a stock 304" VR dipstick, and probably an unknown 308 commodore dipstick.
Notice the height difference of fill and full marks.
Dipsticks are the same length, it's just the marking height change for whatever reason the factory decided.
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UTE042_NZ

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Um, its not the distance from the bottom of the the stick but the to the top of the tube (where the the stopper stops you pushing the dipstick in any further) that matters. The distance between the "Add" and "Full" lines looks the same to me, but can't see the stoppers, which determines each dipsticks depth into the sump.
 

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Um, its not the distance from the bottom of the the stick but the to the top of the tube (where the the stopper stops you pushing the dipstick in any further) that matters. The distance between the "Add" and "Full" lines looks the same to me, but can't see the stoppers, which determines each dipsticks depth into the sump.
Agreed,
But these two are the same length, with the same heads, handles, stoppers etc.
Basically identical in every way except for the markings.
99% sure my dipstick tubes are identical, but will recheck at a later date when current motor is removed.
 

Deuce

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Oil pump mods.

Who can explain the relief valve re-referencing?
From what I can see, it currently gets it's signal post filter and dumps to pre-pump. Moving the signal to pre-filter (which with restrictions is a higher pressure) still dumps it back pre-pump.
So why would we do it?
Is it specific to the bypass delete mod?

Intrigued and keen to know the answers!
 

Immortality

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IIRC the relief valve reference mod was done in conjunction with blocking the internal oil bypass forcing 100% of the oil through the filter all the time.
 

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IIRC the relief valve reference mod was done in conjunction with blocking the internal oil bypass forcing 100% of the oil through the filter all the time.
Blocking the bypass force's all the oil through the filter.

But if you don't re-reference the pump, does this mean you can build excessive pressure pre-filter if it gets gunked up?
Re-referencing will mean pressure pre-filter is regulated and a gunked filter would result in low oil pressure on the gauge?
 

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Fairly much, even a clean filter is a restriction to some degree, especially when the oil is stone cold so you need to ensure the oil is warmed up before really getting on it as you will drop a fair bit of pressure across the filter and you don't want to explode a filter either.

TBH, I'm not sure it's something you'd want to do on something you want to be able to jump in and drive without waiting to warm it up.
 

someguy360

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Fairly much, even a clean filter is a restriction to some degree, especially when the oil is stone cold so you need to ensure the oil is warmed up before really getting on it as you will drop a fair bit of pressure across the filter and you don't want to explode a filter either.

TBH, I'm not sure it's something you'd want to do on something you want to be able to jump in and drive without waiting to warm it up.
Yeah I did see a video from Mondo on the pro holden v8 page a while back showing what can happen to oil filters if you start getting on the RPM when the oil is cold with bypass blocked pumps (think Titan submersible).

Thats why a lot of the guys that get really really high oil pressure on cold start use the bigger Z30 filters and not the Z160's as less chance of an implosion as theres more surface volume.

My block has all the basic TK oiling mods (no priority mods or gallery crossovers etc though) and prepped pump etc and with my 25w60 I only see about 50psi on cold start, but apparently some people can see spikes of up to 80-90psi on cold start with very well worked oiling systems in these with the bypass blocked.

ksw9aGb.png
 
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Immortality

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That's a name I've not heard in a long time.

20+psi drop over the Z160 filter. I run the Z30 regardless :)
 
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