Documenting the rebuild of my Pro Sport 107 - motor, exhaust, etc and some WTFs

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LA_Dog

LA_Dog

Go Fast, Go Faster
ok so a quick update on everything... man trying to get anything done during December is like trying to drag a bag of rocks uphill... with a busted leg.

  • All engine parts cryod & heat treated
  • All tins painted gloss metallic black with color-shift clear coat. no graphics
  • Tank dash and oil bag getting coverd with black carbon fiber weave
  • crank is trued and balanced with pistons
  • heads decked .060 and assembled with new AV&V beehive valves / high lift springs
  • pistons fitted for cylinders / cylinders honed
  • engine parts will be done at polishers by end of week (engine case is already done)
  • mechanic picking up case tomorrow to begin re-assembly of bottom end
  • remaining parts (heads, rockers, cylinders) picking up from polisher this coming Friday or Monday (I had the rockers chrome stripped off so they could be polished)
Engine reassembly hopefully going down toward middle of next week- still some final machining left to to / possibly need to trim cylinder bottoms for zero decking the pistons, and do a bit of final head bowl work to unshroud valves and hit target CC. This bowl work will dictate final static and corrected compression with the TMan 625 cam

Getting 2-up seat re-stuffed, re-shaped and covered with Mercedes titanium black leather. Plus integrating a mini sissy-bar into the back of the seat for the missus :D

I'll get a solo seat fabbed up later on so I can swap out on my "me" days :D

Got some new gloss black 27" drag bars w/ 5" pullback, some chrome 5" dog-bone risers w/ 1.5" offset, and also a pair of DNA 3" pullback 7" high risers if the dog-bones don't feel right.

RB Racing chrome 2-1 LSR pipe going on as well, to replace the Hooker pipe.

Maybe by end of month will bring some good news. Stay tuned.
 
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LA_Dog

LA_Dog

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hey this was cool so wanted to share- i was down at the cryo shop and they were busy modifying their heat treating oven- they had a customer bring in a 4-and-a-half-foot crank from a rare airplane engine. they had to make the oven longer to fit it in. this thing was gi-normous.

Apparently it is impossible to buy another crank if it ever breaks, and having one machined from scratch is like $30k. The cryo and subsequent heat annealing process ensures the crank stays strong and avoids surface wear. really cool stuff.
 
LA_Dog

LA_Dog

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OK so thought I'd update everyone in case you're bored for anything better to read :D

Custom seat is almost done- picking up next week
Heads are still at Branch waiting for me to tell them what cc volume I need in the head chambers
Crankcase assembly should be done. Waiting for my mech to let me know. Then it is assembly time and trim cylinders for a zero deck.

Here are my options for compression. TMan sez 10.5 to 10.6 static is good to go with this cam in my motor on 91 pump gas. My only "concern" is the resultant high corrected compression and high cranking compression. It all comes down to the CC of the heads so I can set the compression any way I want: Suggestions?

Heads currently are 83cc, which equals 10.76:1 Static, 9.86:1 Corrected, 208psi Cranking Pressure with the 41 intake close of the cam. Pistons will be zero-deck and using 0.030 head gasket. These figures take into account bore, stroke, rod length, assembled quench .030, valve relief pocket volume (1.7cc per piston).

Engine Compression Figures based on enlarging the CC of heads (I need to decide on one of the below):
85cc Heads = Static 10.55, Cam Corrected 9.69, Cranking Pressure 204psi
86cc Heads = Static 10.45, Cam Corrected 9.58, Cranking Pressure 200psi
87cc Heads = Static 10.35, Cam Corrected 9.49, Cranking Pressure 198psi
88cc Heads = Static 10.25, Cam Corrected 9.4, Cranking Pressure 195psi
89cc Heads = Static 10.16, Cam Corrected 9.32, Cranking Pressure 193psi

Cam specs for reference:
Intake:
Open/Close: 23/41 Lift:625 Duration:244 Centerline:99 LSA:100.5 Overlap:44

Exhaust:
Open/Close: 45/21 Lift:625 Duration:246 Centerline:102
196
Cam Advance: 1.5

Motor timing will be 30 degress Max @WOT
 
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LA_Dog

LA_Dog

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Also- here are the head flow specs for the early "special" Big Dog Edelbrock Evo heads with 2" intake and 1.625" exhaust valves. PDFformat. Hard info to find.. put this together myself. but I could not get data past a .600 lift so keep that in mind.
 

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stlmikie

stlmikie

I wish I had more money.
Who do you plan on having dyno it? The desktop dyno seems pretty generous. I hope it's not for your sake! I'll tell you that if you are able to generate those numbers you'll have the hottest 107" around these parts that's for sure. Hold on!
 
LA_Dog

LA_Dog

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stlmikie said:
Who do you plan on having dyno it? The desktop dyno seems pretty generous. I hope it's not for your sake! I'll tell you that if you are able to generate those numbers you'll have the hottest 107" around these parts that's for sure. Hold on!
Click to expand...
LOL - yeh I tend not to put too much stock in software results- It's only good for "estimating" as far as my level of knowledge goes.

This "Desktop Dyno" is actually more conservative. I ran Engine Analyzer PRO and it showed peak numbes of 139hp/140tq @5500. Umm. yeah wouldn't that be nice from 107 inches? :eek:

Seems to me the tq / hp numbers in the software dynos are based mainly on CFM / flow calculations (more air in / out, more power). e.g. generally correct but in real world use not totally correct.

The one take-away from running these programs, is it shows my tendency for knock / detonation and heat is high if I'm not careful with the compression, air/fuel mix and timing. I'll also be runnng a VOES switch set at 6.5hg.

There's a local place here for full dyno testing / tuning but I'll need to put at least 1k on the motor first.
 
LA_Dog

LA_Dog

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oh BTW any of you who have the chromed S&S rocker boxes / covers, they strip and polish up really nice. My polisher got them to look like mirrors (no chrome anymore), good quality aluminum. of course pics will be forthcoming when everything is back together..
 
LA_Dog

LA_Dog

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OK well 3 weeks just got wasted by Branch Okeefe. They totally screwed the pooch, never did the work, and then neatly blamed me for everything. I vented my disgust in a separate thread.. major wtf.

Anyway, heads are at a different machine shop and should be ready soon. I was down looking at my painted tins and they are SICK! Well, as sick as a solid color can be :D Serious coats of deep black, with this ultra ginchy color shift mixed in. you look at it and it looks ultra gloss deep black, the light hits it and pops of dark blue jump out of the paint. Effing cool, never seen anything else like it. The color shift additive is like $400 for an ounce of crystals (ok I know what this sounds like.. lol). My mechanic had some left over from a previous job and hooked me up. indeed.

Got the 30t transmission pulley (Andrews) to bump my overall gear ratio from 3.13 to 3.34, that should help get the rpm's up a bit and through 1st to 6th quicker. Confirmed the change with Baker and they said the swap to 30 from 32 is a good change- Ideally I should swap to a chain final drive and get the overall proper front / rear drive gears. Will definitely do that at some point later on.
 
tommy666

tommy666

Well-Known Member
Ok. When is that thing going to be on the road? All sounds very cool!


Sent from my iPhone using Tapatalk
 
LA_Dog

LA_Dog

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I keep saying "a couple of weeks" but I've been saying that for some time now..

Heads are the last component- so everything should wrap up quickly once they are done. You can bet I'll be posting some info / pics when it is running!
 
LA_Dog

LA_Dog

Go Fast, Go Faster
Bike is going on the rack at shop, final assembly of motor, etc- Should have some life back in this beast by next week.
 
pauldeepsea

pauldeepsea

Guru
LA_Dog said:
Bike is going on the rack at shop, final assembly of motor, etc- Should have some life back in this beast by next week.
Click to expand...
Looking forward to seeing it! been there, and then went out and bought a second M/C and realized that I blew almost $12K on the rebuild and could have bought another bike with the $$ I spent on my pitt. all worth it to me though!:up:
 
LA_Dog

LA_Dog

Go Fast, Go Faster
pauldeepsea said:
Looking forward to seeing it! been there, and then went out and bought a second M/C and realized that I blew almost $12K on the rebuild and could have bought another bike with the $$ I spent on my pitt. all worth it to me though!:up:
Click to expand...
LOL yeh ain't it just like that sometimes... :angry:

Overall can't complain too much (except for the --long-- extended downtime) - Practically stole the bike for $6k, rebuild and other things I've bought for it setting me back $4-5k. I'll still be in it for a reasonable amount overall. :up:
 
LA_Dog

LA_Dog

Go Fast, Go Faster
Here's my new seat with custom integrated sissy bar. Mercedes graphite black leather. I had the dimensions re-worked for the saddle and passenger pad for a more comfortable fit. Also going to have a matching solo seat fabbed up.





 
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