Joe----You could do all of the things that are required for a high rpm
race engine, but I don't think it's necessary. An engine in decent
condition will take a modest "boost", such as the one offered by Moss,
with little more than the initial outlay. (This kit could be a bit
overpriced) The power Moss advertises from six lb. of boost also seems
understated. Kastner claimed 165 hp from his turbo kit with the same
amount of boost, and I have good reason to believe this.
The reasons I don't think all of this special work is required stems
mostly from the rpm band where supercharged motors generally make their
high torque and power. This is at a much lower speed, and so the threat
of broken cranks and rods is remote. Flywheels stay put, and threat of
overheating is about the same as a stock motor. Needless to say that
they could, or should, idle well, and deliver fair mpg, if that is a
concern.
Aside from the fact that forced induction engines can also be made to
run cleaner, we can also take a look at what the new car industry is
doing to hop up their sporty models. Turbos and Superchargers,
everywhere you look!
Dick
From:
grant@bowtie6.com(Joseph Grant)
OK, question about the SC kit:
So suppose you spend the $3500 for the SC kit, plus the $750 for the
damper, how much would be a good ballpark figure to estimate for
'optimizing' the rest of the engine? Would another $4000 do the trick
(that would be for crank/rods/pistons/etc)? Or would that figure be too
low?
Joe
'72 TR6 - CC77169
http://www.bowtie6.com/
-----Original Message-----
From: owner-6pack@Autox.Team.Net [mailto:owner-6pack@Autox.Team.Net] On
Behalf Of Robert Lang
Sent: Thursday, August 16, 2007 09:51
To: Navarrette, Vance
Cc: Triumph 6 Pack
Subject: RE: [6pack] Moss supercharging question
Hi,
I replied to Stan off-list with a shorter message indicating exactly
what Vance says. The key here - TR6 cranks are def. a weak spot as they
are highly stressed owing to the over-square (?) DT
design and the four main bearings.
If _I_ were to do a supercharger setup, the first thing I'd do is get a
serious crank dampener on there. Of course, I'd do that if I were
building a normally aspirated race motor too!
But if you want to boost your motor, you have to think about what you
can do to keep things reliable. Keeping the crank in one piece is a good
start.
Along those lines, pretty much the entire bottom end of the motor should
be "optimized" if you want to start building power. So include balancing
everything as well as making sure the rods are perfect (better still,
try a set of 4130 rods from Pauter or Saenz or Carillo) to get things
rock solid. _Then_ go for increased compression or boosting.
Richard Good had an ATI dampener on his TR6 at VTR... he said a kit
would be expensive, like in the $750 to $1000 range (probably more
towards $1k, BTW). But compare that to the cost of obtaining, tweaking,
balancing and all the other stuff to get your crank up to snuff and that
looks like a reasonable cost over time. Hint - write or ring Richard to
get this project going. :-)
Regards,
rml
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