Screamin' Eagle Big Bore / Performance Parts
Connie Olson
(along with performance cams) alone or together with the Big Bore (95")
cylinders?
I've a 2000 Road King Classic and just talked with the HD Dealer about the
big bore kits. He said that you could get similar performance gains just by
going with the performance heads (since the stock heads are crap) along with
the 203 cams. Now you could really get a boost by both the big bore and
heads.
Opinions?
Jay
2000 FLHRCI
Waro
news:xFuX7.148808$RP1.29...@typhoon.kc.rr.com...
Jay....have the cylinders bored to match new 95ci pistons....much cheaper
than buying the kit. You can get a better piston fit then the kit gives
you. The SE203 cams and 95ci flat top pistons is a nice combo.....very good
low end performance and great passing power at 70 MPH. . Your better off
having the stock heads ported and polished over new heads.....SE heads cost
about $1200.....the work on your stock heads will save you a bunch of $$ so
you can get the carb and ignition module you need. I tested a CWedge
modified Road King several months ago with this combo.....was a nice riding
bike with plenty of power....had great low end torque. You can always have
the heads done later.....95ci with flat tops, SE203 cams, stock heads, 6200
race ignition module, and a better carb is a great combo with the PROPER
PIPES.
I have 95ci TC with 10:25 pistons, SE203 cams, SE 44mm carb, Supertrapp 2x1
pipe, and stock heads.....had to purchase the SE7000 ignition module to make
this combo run right due to the high compression pistons. I'm pushing about
88+ HP and will have the heads ported to match the cam.....the SE 44mm carb
replaced with a S&S E carb before spring hopefully raising HP up to
95+HP.......should be a low end torque monster.
--
Waro, 99 FXD
Preacher
> Anyone tried the Screamin' Eagle Twin Cam 88 performance cylinder heads
> (along with performance cams) alone or together with the Big Bore (95")
> cylinders?
I am the owner of a mailing list that is specific to Harley-Davidson
Twin-Cam powered motorcycles. It has 1676 members right now and there are
quite a few of them that have used the Screamin' Eagle *Performance* heads
(versus the SE HTCC heads). They have used them on both 88" and 95" engines
(there might even be one or two folks on the list that have 'em on the 103"
SE Stroker engines too).
If you are interested in joining the mailing list you can subscribe to it by
going to the Yahoo Groups main page (Yahoogroups.com?) and searching for the
HarleyTC88 (one word, case sensitive) group (*group*, NOT "club").
The main page URL for the list is http://groups.yahoo.com/group/HarleyTC88/
I *think* there is a link on the Main Page that will let you subscribe to
the group/mailing list if you decided to.
If you subscribe and find out it's not what you were looking for you can
simply unsubscribe. It's painless. No charge, no fee, no nothing. It's all
about helping other people with the same interests (Harley Twin-Cam powered
motorcycles).
You will see that one of the people who respond to your post here (Waro) is
one of my list members.
> I've a 2000 Road King Classic and just talked with the HD Dealer about the
> big bore kits. He said that you could get similar performance gains just
by
> going with the performance heads
Okay, think about this for a second. This "advice" is advice that is based
strictly on monetary gain by your dealer, IMO. A monetary gain on *his*
part. Look at it this way: he would be able to sell you a set of heads for
~$850 instead of you buying a set of pistons (from just about
anywhere/anyone) for between $150-$300. You would take your jugs to a
machine shop and having them bored for between $100-$160 a set.
So the dealer is looking at either selling you a set of heads for ~$850....
or selling you a set of jugs for ~$300 and a set of pistons ~$150 ($450
total).... or not making *any* money at all if you were to use aftermarket
pistons (like many people do) and have your own jugs bored out (which is
*far* preferable to using the factory big bore jugs) by a machine shop.
Do you see what I'm trying to say? Is there any question at all what his
motives are based on?
I question his motives, just read on and see *why* I question his motives.
> (since the stock heads are crap)
Tell him I said he's full of shit. The stock heads are great heads up to a
point. The point is at about 100 horsepower.
Want proof? Okay, I have a list member with a FXDWG (Wide Glide) that
installed a 95" BB kit using the 9.6:1 CR Forged pistons (advertises as
10.5:1 w/SE Perf. heads), a set of SE-211 cams, a pair of SE-II slip-on
mufflers, a SE State 1 Air Cleaner, the STOCK Ignition system and he has
DEAD STOCK HEADS on it. When I say *dead* stock I mean never touched from
the factory. No "touch up", no "refresh", no nothing. DEAD STOCK. He had the
bike dyno'd and he has the dyno sheets posted at my site that shows his peak
HP and TQ. He peaked at 93HP and 104ft-lb torque.
So what was that your dealer was telling you about getting more out of a set
of SE heads then out of a Big Bore kit with *stock* ("crap") heads? Your
dealer doesn't know what he is talking about and you can tell him that *I*
said so.
He should educate himself on what a Twin-Cam is capable of.
> along with the 203 cams.
Ouch... without going and looking up the SE-203 cam specs, I'm going to say
that he is giving you a recipe for disaster. That just looks like a
ridiculous combination to me off the top of my head. He's saying to use
(High) Performance Heads with the mildest cam (other than stock) that
Harley/Screamin' Eagle markets or sells.
That is a *huge* mismatch IMO. The smaller combustion chamber on the SE
heads along with the early cam timing and small overlap of a SE-203 cam
would most likely end giving you a "detonation monster". I doubt you could
open the throttle up off of idle without getting some major
pinging/detonation. That is, if you didn't wipe out your starter ring gear
from the high cranking compression that could result from that combination
first.
I'd have to double check the SE-203 cam specs and the CR that the SE Perf.
heads would give you on a 88" engine before I could say for *sure*, but if
memory serves me the SE-203 is intended for a stock bore with stock heads.
The SE-203 is analogous to a "RV Cam" you'd use in a car/truck (*very*
mild). When you bump up the compression ratio (CR) you need to bleed off
some cylinder pressure with a bigger cam. It all depends on how much you
bump the CR up and that's why I say I'd have to see what a set of SE Perf.
heads will give you on a stock bore engine.
> Now you could really get a boost by both the big bore and
> heads.
Ahh, now yer talkin'. And don't forget the cams. You have to match all of
your components as a whole. It's the "whole package" that makes a good
running motor, not any one item.
There are three ways to make more torque. Obviously, Cylinder Fill
(Volumetric Efficiency/VE) is important. Other than VE you can add
compression (ratio) or cubic inches. The BB kit will do *both* (compression
AND cubic inches). The stock heads don't have a problem with VE at lower
rpm's, which is where the *vast* majority or people keep their engines at.
In fact, the Stock heads have small ports and will give you *better*
cylinder flow at low(er) rpm's then a set of performance heads will. The
port velocity is high due to the small port volume. And everybody knows that
the faster you move something (Mass) the harder it is to slow it down or
stop it. That's what a good port job is all about. It's not about getting
big *flow* numbers, it's about getting a good balance of Flow and Velocity.
Ask *anyone* that knows *anything* about head porting and air flow (and I
don't mean someone who *thinks* they know about head porting and air flow!).
Ask someone like Jerry Branch.
Oh, and I think I'd go talk to another dealer if I were you!
Preacher
Cwedge
Waro
news:U_ZX7.330395$er5.7...@e3500-atl2.usenetserver.com...
Now I'm in trouble.....Let's go with the Andrews 37b.
--
Waro
