A lot of people aren't familiar with merge collectors since they are more
common in NASCAR and NHRA than in vintage racing. Merge collectors are not
just a 4 into one collector (or three into one), they have a
convergent/divergent nozzle that affects tuning. Generally the collector is
also very carefully made to maintain the base diameter of the inlet pipes
until the nozzle is reached. You can see a pretty one at
http://www.burnsstainless.com/MergeCollectors/mergecollectors.html . They
are always expensive
> -----Original Message-----
> From: owner-fot@autox.team.net
> [mailto:owner-fot@autox.team.net] On Behalf Of alfetta95@optonline.net
> Sent: Friday, June 02, 2006 1:39 PM
> To: Jack W. Drews
> Cc: fot@autox.team.net
> Subject: Re: [FOT] merge colectors
>
> My 2 cents.
>
> On my other 4 banger, the Italian job, I changed from a 4-2-1
> race header with a 2" exhaust to a 4 - 1 equal length race
> header into a collector with a 2.5" exhaust. I noticed a
> hugh increase in low and mid range torque but not really a
> difference at the high end. The most notable difference
> is.... It sounds really cool.
>
> Todd Redmond
> 1958 TR3-A
>
>
>
> ----- Original Message -----
> From: "Jack W. Drews" <vinttr4@geneseo.net>
> Date: Friday, June 2, 2006 12:52 pm
> Subject: [FOT] merge colectors
>
> > The FOT list has been entirely too quiet lately. It gives me the
> > heebiejeebies when I come in here and see this empty screen.
> > Assuming
> > that everybody is out playing with their cars but might
> look at their
> > screens occasionally, my latest question is
> >
> > Does anybody know for sure if a merge collector is of any
> benefit on
> > our four cylinder relatively low revving engines?
> >
> > I'd test mine with and without on the chassis dyno but that is a
> > really difficult thing to change at the dyno shop.
> >
> > The reason I'm asking is that I put on a merge collector from Burns
> > Stainless a couple of years ago and other guys still beat me.
> >
> > uncle jack
> >
> >
> >
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