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It's About Time!

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27 replies to this topic

#21
TigerDan

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That's the plan!

 

And I tried to attach my test drive videos but the files are too big, it looks like we're limited to 64MB and the smallest of the videos is 66 MB, and they go up from there. So here are a few final pics instead. The first two are shortening the trumpets, I took off 5/8". The consensus seems to be to remove between 1/2" to 3/4" so I went with 5/8" Actually it was a hair more after finish trimming to get them all of equal length.

 

 

Attached Files


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#22
Desertcrawler

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Nice! Finally the cobbler gets to work on his own shoes for a change!


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Chuck (KI6WSR)
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#23
DHappel

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Are you shortening the runners in hopes of improving low end performance?


Don
'07 LR3 HSE/HD - slightly non-stock

'96 D1 - even more non-stock


#24
TigerDan

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No. Shortening the intake tract generally loses bottom end and improves top end. But the tops of the trumpets sit very close to the top of the plenum and it sort of messes up airflow, so it's been found that shortening the trumpets a bit can improve throttle response and airflow without any noticeable loss off the bottom end. But if you shorten them too much, then bottom end will certainly suffer. I think there's also a spacer available to go between the plenum base and the intake manifold to gain back some intake tract length, and if made of phenolic resin it will also help insulate the plenum from heat.

 

And of course there are the full-on ACT carbon fiber intake trumpets:

 

Superflare-trumpets-640x480.jpg


Edited by TigerDan, 18 September 2017 - 09:08 PM.

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#25
GraemeWare

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No. Shortening the intake tract generally looses bottom end and improves top end. But the tops of the trumpets sit very close to the top of the plenum and it sort of messes up airflow, so it's been found that shortening the trumpets a bit can improve throttle response and airflow without any noticeable loss off the bottom end. But if you shorten them too much, then bottom end will certainly suffer. I think there's also a spacer available to go between the plenum base and the intake manifold to gain back some intake tract length, and if made of phenolic resin it will also help insulate the plenum from heat.

 

And of course there are the full-on ACT carbon fiber intake trumpets:

 

 

Or do a hybrid system using a D2 intake, which flows much better.

 

Graeme


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#26
TigerDan

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Interesting you should mention that, as it's something I'm working on. I just wanted to get the new engine in first with everything still pretty much the same to get a baseline.I'll drive it like this for a while and take a little more time to work out a few details, but I've got it mostly figured out how I want to do it.


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#27
DHappel

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Keep us posted.  I have a few various intakes sitting around that might just come in handy after all.  :)

 

I feel like my 4.6 is strangled at higher revs and load.  The exhaust sounds very 'weezy' with a 'rushing' sort of noise when pulling up a hill over 3000 rpm, so I suspect that the cats may be partially clogged or perhaps even the muffler, though it's a flowmaster so I don't really expect it to be a restriction.


Don
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'96 D1 - even more non-stock


#28
TigerDan

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I've had plugged cats make a whooshing sound at higher revs like you describe (not on a Rover, but on other vehicles) accompanied by loss of power, so you might be on the right track. And no, I wouldn't expect a Flowmaster to become plugged like that.


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