[Vwdiesel] EGT Gauge Probe Mounting
LBaird119 at aol.com
LBaird119 at aol.com
Fri May 31 03:44:38 EDT 2002
In a message dated 5/30/2002 9:59:47 PM Pacific Daylight Time,
jjhoehl at hotmail.com writes:
> I don't know much about exhausts - when it comes to turbos though, I thought
> it's best to have as little restriction as possible after the turbo.
>
>
> >I'm now considering the "ideal" to be more like 2 1/4 for an inch or so
> >and then going to 2 1/2.
>
Indeed you are correct. My first downpipe, using 2 1/2" pipe with a
2 1/2 inch radius, on THICK "weld ell" pipe, didn't leave enough room
to tighten all four nuts from the flange plate to the turbo. That's why I
figure a 2 1/4 for just a tad would be better overall. I actually have 3" or
so for about a foot, after the elbow. :) Expansion chamber ya know!
I ground out quite a bit around the nuts and even had to build up a
little inside where I went through, just to get 3 of the nuts on. Couldn't
get to one of the lower ones at all.
>
> Is that introducing a restriction? Or is the motivation strength and ease
> of manufacture? I too must make a new downpipe, and I want mine to be
> 'ideal' too. ;)
>
I made the flange out of some scrap 3/8 I got for a bargain. It was even
the correct width, just barely. Considering the original pipe being
somewhere
around 1 1/2 inch ID, in the middle, 2 1/4 isn't much of a restriction. With
it just coming out of the turbo, it shouldn't be noticeable or not enough
when balanced against not tightening the bolts. 2 1/2 exhaust pipe might
still work. Those weld ells are near 1/4 or so thick! I wanted HD but I
think that might be overkill. I also couldn't see much of a way to get
that tight of a radius on exhaust pipe without choking it down pretty
bad anyway. Compared to that option, a short, smaller pipe and a nice
clear, pre-formed 90 should flow better.
Clear as mud? ;-)
Loren
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