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NA intake runners vs turbo

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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FLXC90
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Re: NA intake runners vs turbo

Post by FLXC90 »

abscate wrote: 18 Sep 2020, 11:54 I don’t have time to sit next to my manifold all night reading “Great Expectations”
Just hone the Dickens out of it?
Current Volvos:
1998 V70 T5, 112k sat 5 years, still in mechanical coma (finally at the top of the pile )
2004 XC90 T6 AWD: 186k, 60 on transaxle ( traded in )
1998 POS70 N/A: DD/training aid, 236k but really about 240k, I think...ABS module( passed on to son who sold it)

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Post by abscate »

FLXC90 wrote: 18 Sep 2020, 17:37
abscate wrote: 18 Sep 2020, 11:54 I don’t have time to sit next to my manifold all night reading “Great Expectations”
Just hone the Dickens out of it?
Nice!
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Post by Sveedy »

I'm a woodworker so I'll make a quick jig to hold the manifold on my bench and a template that I can bolt to the manifold flange. Then use a pattern bit in a router and make repeated passes to cut it away. I make round windows and jambs so this is not out of line. Should leave a perfect edge. Yes - doing this with a grinder etc would take forever and would probably be way less than true.
But a compass and a router... :)
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Post by jimmy57 »

While the intake is off peen several places around the cup plug with the vac nipple on it. Those have lots of history of popping out if you run boost up higher than stock.

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Post by matthew1 »

Sveedy wrote: 18 Sep 2020, 17:53 I'm a woodworker so I'll make a quick jig to hold the manifold on my bench and a template that I can bolt to the manifold flange. Then use a pattern bit in a router and make repeated passes to cut it away. I make round windows and jambs so this is not out of line. Should leave a perfect edge. Yes - doing this with a grinder etc would take forever and would probably be way less than true.
But a compass and a router... :)
I'm always humbled by work like this. Can you snap photos as you go along?
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Post by matthew1 »

abscate wrote: 18 Sep 2020, 17:51
FLXC90 wrote: 18 Sep 2020, 17:37
abscate wrote: 18 Sep 2020, 11:54 I don’t have time to sit next to my manifold all night reading “Great Expectations”
Just hone the Dickens out of it?
Nice!
So bad it's good :lol:
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Post by Sveedy »

So bad it's good :lol
[/quote]

X2 :)

And yes - I'll document everything for the next person who wants to go this route.
Thanks Jimmy - I'll address that potential problem.
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Post by Sveedy »

Question - I have been collecting the parts for this mod, but does anyone know if, or how, this will change my fuel millage ?
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Post by FLXC90 »

That would be entirely up to your right foot. It will allow for better airflow, but it's still limited by throttle opening.
Current Volvos:
1998 V70 T5, 112k sat 5 years, still in mechanical coma (finally at the top of the pile )
2004 XC90 T6 AWD: 186k, 60 on transaxle ( traded in )
1998 POS70 N/A: DD/training aid, 236k but really about 240k, I think...ABS module( passed on to son who sold it)

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