G
Guest
Guest
I mentioned a short while ago that I recently fitted a new OEM front
downpipe on my 80. As soon as this was fitted I noticed that the
tickover revs were higher. I don't have a rev counter but I guess
there may be 100-150 or so more revs.
The old downpipe and its predecessor was one single length of pipe
with no flex section, which went from the manifold down to the
bracket under the RHS front footwell. The new pipe however, has a
flex section fitted where it nears the firewall which is then
followed by a short fat silencer (or at least an expansion box)
before the support bracket. I have seen this type of pipe on other 1
HZ powered 80's in an office fleet; but the last time I needed a
downpipe (the other one sheared at the manifold flange - no guesses
why!) I went to the local super scrapman in Sarajevo and picked over
his ex UN wrecks for one.
I assume that the silencer is responsible for some back pressure thus
causing the extra revs, strange as I would have thought this might
affect a turbo engine and not the more 'numb' characteristics of my
basic naturally aspirated 1HZ engine.
Does anyone have any thoughts on that, or even, should I turn the
limit screw down to reduce the revs, though they seem harmless enough. TIA.
Cheers
Jon
Linslade, Beds
'92 HZJ80 ex UN Bosnia surplus
downpipe on my 80. As soon as this was fitted I noticed that the
tickover revs were higher. I don't have a rev counter but I guess
there may be 100-150 or so more revs.
The old downpipe and its predecessor was one single length of pipe
with no flex section, which went from the manifold down to the
bracket under the RHS front footwell. The new pipe however, has a
flex section fitted where it nears the firewall which is then
followed by a short fat silencer (or at least an expansion box)
before the support bracket. I have seen this type of pipe on other 1
HZ powered 80's in an office fleet; but the last time I needed a
downpipe (the other one sheared at the manifold flange - no guesses
why!) I went to the local super scrapman in Sarajevo and picked over
his ex UN wrecks for one.
I assume that the silencer is responsible for some back pressure thus
causing the extra revs, strange as I would have thought this might
affect a turbo engine and not the more 'numb' characteristics of my
basic naturally aspirated 1HZ engine.
Does anyone have any thoughts on that, or even, should I turn the
limit screw down to reduce the revs, though they seem harmless enough. TIA.
Cheers
Jon
Linslade, Beds
'92 HZJ80 ex UN Bosnia surplus