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Billet Girdle

shanef

By shanef,
in Engines & Forced Induction

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shanef Grand Master

shanef

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Well after almost 12 months since the last one, i've just had machined 2 new billet girdles. One to suit a rwd RB and another to suit the 4wd rb30. This time it replaces the entire std girdle.

Testing will be carried out on an engine in the next 2 months.

girdle001wg0.th.jpggirdle003le1.th.jpggirdle004hv7.th.jpggirdle005is2.th.jpg

girdle008se8.th.jpggirdle011qf2.th.jpggirdle015rf7.th.jpggirdle016lq1.th.jpg

girdle017po1.th.jpggirdle018cw4.th.jpggirdle019jo8.th.jpggirdle020qo5.th.jpg

girdle031jn0.th.jpggirdle022en8.th.jpggirdle024yd8.th.jpggirdle025we0.th.jpg

girdle026yt0.th.jpggirdle029qp8.th.jpg

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shanef Grand Master

shanef

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they look the goods....but the real question......tell em the price son.

wont know exact price until i get the invoices, as soon as i know i'll post it up

Very nice work! what material did you make it from?

thanks. material is 7075

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shanef Grand Master

shanef

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going to be a stupid question but i want to know lol

whats the advantage of this over a stock rb30 one with a 4wd adaptor plate? (for GTR)

*puts flame suit on*

the 4wd adapter is only a 'spacer', its does not tie into the girdle to the block.

this girdle ties everything together, the block, crank and girdle

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shanef Grand Master

shanef

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Do you forsee any issues with the difference in themal expansion between the block and girdle?

Yes the thermal expansion rate of alloy is greater than that of cast iron, but i dont see it as a great threat to the integrity of the girdle.

When the alloy heats up, it will expand at a greater rate than that of the block, however there isnt any real where for it to expand to, it will actually give a tighter lock into the block.

This is one of the observations we'll be making with the test engine.

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STATUS Grand Master

STATUS

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i think adriano was thinking the same thing i was. My concern (possibly unfounded) is that differrent thermal expansion rates would play with bearing crush... and or centricity

Edited by URAS
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Chris Wilson Proficient

Chris Wilson

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Beautiful!! :) Is there any reason you couldn't make one in steel, given a big enough lump of material? Here in the UK it's very hard to get decent line boring and honing done, they often end up a real pig's ear. How do you go on in Oz?

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shanef Grand Master

shanef

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Beautiful!! :( Is there any reason you couldn't make one in steel, given a big enough lump of material? Here in the UK it's very hard to get decent line boring and honing done, they often end up a real pig's ear. How do you go on in Oz?

Cost. Itd be more expensive to make one from steel due to the time required in machining. Also steel isn't all that good for dampning harmonics, and add to that the massive weight of the thing.

We dont have a problem with line boring/honing if you use the right people.

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