Another Harley Hop-Up Ho-Hum

 

This evening I'll be taking my buddy Tom out to Winchester H-D to pick
up hs newly modified 2008 Electra/Street Glide[1].  It has new
pistons, heads, cams, and exhaust.  It'll be interesting to compare
his new-wave 103 against my old-school version.

Looking forward to the back-to-back test ride.

[1]  Electra Glide Standard which the previous owner modified to
(MOSTLY) look like a Street Glide

 

On Sat, 7 Aug 2010 09:04:44 -0700 (PDT), "tomorrow@erols.com"


Of course we are looking for a complete review/report including
pictures and pdf's of the dyno sheets. ;-)

Correct me if I am wrong but after new pistons and heads do you not
have to break that motor in before pushing it too hard? Or will
Winchester H-D break it in on the dyno?

Mike at Speedtwins in Calgary tells me his dyno can simulate variable
loads and he can do the break in for piston and head work before he
gives the bike back to his customers. For a fee of course.

 


Generally, the engine has to be broken in (again) after new heads,
pistons, rings.  My racebikes were ALL broken in on the dyno (via
dynotuning for performance, not via some breaking-in regimen), and
I've never had any problems with them afterwards, even engines that
went back to the street from the racetrack.

I've broken in two stock H-D engines and two hopped-up H-D engines on
the street without any special precautions except 1) not lugging the
engine, 2) no sustained high-rpm running, 3) no sustained single
engine speed riding, and 4) no super-hot temperature stop-and-go low-
speed riding.   I haven't observed any particular engine speed limit
or road speed limit.  They've all done okay.

I wouldn't ever pay anyone to break an engine in on the dyno.  I think
that would be a waste of dyno time and my money.  But I can understand
selling such a service if there are people willing to pay for it.

 

On Sat, 7 Aug 2010 11:28:02 -0700 (PDT), "tomorrow@erols.com"


Given it would take me less than a couple of days to break it in
myself I would agree.

 

don (Calgary) wrote:

  While I agree on the waste of a dyno break in , a lot depends on just how
tight that new motor is . When I fitted new pistons in the ol' shovel , I
used KB's and had them at the low end of the clearance spec . Took all of a
thousand miles before it felt "broken in" to me . Too bad I didn't do as
well on the valve guides , but then again it made a perfect excuse for
buying S&S heads ... which I also babied for the first thousand miles .
  It was worth the effort - to me .
--
Snag
Wannabe Machinist