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#3220605 - 12/18/13 11:56 AM Re: Harley-Davidson FXSTS 1992 valvetrain picture [Re: Finn]
skully Offline


Registered: 11/30/13
Posts: 35
Loc: NYS
looks good, post pics when done. about the front end, its not a clunk, its like a goove/notch that will lock the front end forward. if you can swing the bars left-right, back and forth and not feel them wanting to lock into one position, then your good, if the want to go to one spot all the time, without any fallaway then you have pooched bearings, that can be very unsafe. this all is done with the bike on a stand, but then again, your old so you'll never be at any hi-speed...lol.

to the other poster, the springer and my fxlr are my favorite bikes to ride, i will and always have had a springer

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#3220642 - 12/18/13 12:33 PM Re: Harley-Davidson FXSTS 1992 valvetrain picture [Re: Finn]
Finn Offline


Registered: 03/01/10
Posts: 307
Loc: Finland
I do use 3rd gear every now and then. grin

We'll check the front end for abnormalities.
_________________________
1991 Lexus LS400 | 1992 Audi 80 2.0E | 1978 Corvette 427" | 1986 Corvette 383" | 1992 Jeep XJ 4.0 HO | 1993 K1100LT | 2009 FJR1300

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#3220895 - 12/18/13 05:33 PM Re: Harley-Davidson FXSTS 1992 valvetrain picture [Re: Finn]
flstffxe Offline


Registered: 03/08/08
Posts: 137
Loc: MN, USA
Originally Posted By: Finn
Originally Posted By: skully
i would not shave heads, no need to with that camshaft, its a bolt in camshaft. .....



Well, 9.25:1 is Andrews' recommendation so that needs a bit of shaving. Would work OK with stock 8.5:1 I guess but if that's what they recommend that's what we'll do. The valves/seats get machined anyway so shaving the heads is not much extra work.


I have to agree, I would not be shaving the heads any more than cleaning them up.

I may be missing it but I don't see anywhere Andrews specs 9.25:1 for the EV13.

Andrews EV13 description from their catalog.
Quote:
Bolt-in street/touring cam for heavy bikes. Much more
low and mid-range power than either stock cam. Best
cam for 2 up riding with camping gear and side cars.


Most street engines have the best power output(are most efficient) with a dynamic compression of 7.5-8.5:1. With out having actual CC volumes and measurements of your parts my quick calculations are as follows. Using a stock 3.498" bore, 4.250 stroke, and a ball parked 7.4375/7.440 rod length with the given static compressions.

With static compression set at 9.25:1. The EV13 with a 31 intake valve close puts the dynamic compression up at around 8.8 to 8.85:1.

If not set up properly this is a recipe that can provide favorable conditions for pinging/detonation as it may run hot. Requiring you to pull back the timing to control engine temps and detonation, thus cutting power. Or make you one of those guys who is always on the hunt for "good gas".

With the factory 8.5:1 static compression, I work it out to be around 8.0 to 8.1:1 dynamic compression. Putting it right in the sweet spot for trouble free operation. Which may allow you to start with more timing and add timing more aggressively, thus building power sooner and higher peak numbers VS the 9.25:1 static compression combination that could be a troublesome.

Again these are just quick calculations, but are enough that to me, I would question the changing of the compression, the rest of the setup(head/ piston cc, valve/port flow, exhaust) and or the choice of cam.

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#3220947 - 12/18/13 06:56 PM Re: Harley-Davidson FXSTS 1992 valvetrain picture [Re: flstffxe]
skully Offline


Registered: 11/30/13
Posts: 35
Loc: NYS
Originally Posted By: Finn
I do use 3rd gear every now and then. grin

We'll check the front end for abnormalities.



omg...not third??..lol. all kiddin aside, whatever you do to the gearside of the motor is up to you, make sure you use the steel breather, plastic is not supposed to be in an engine. make sure that the neck bearings are good. have fun


Originally Posted By: flstffxe
Originally Posted By: Finn
Originally Posted By: skully
i would not shave heads, no need to with that camshaft, its a bolt in camshaft. .....



Well, 9.25:1 is Andrews' recommendation so that needs a bit of shaving. Would work OK with stock 8.5:1 I guess but if that's what they recommend that's what we'll do. The valves/seats get machined anyway so shaving the heads is not much extra work.


I have to agree, I would not be shaving the heads any more than cleaning them up.

I may be missing it but I don't see anywhere Andrews specs 9.25:1 for the EV13.

Andrews EV13 description from their catalog.
Quote:
Bolt-in street/touring cam for heavy bikes. Much more
low and mid-range power than either stock cam. Best
cam for 2 up riding with camping gear and side cars.


Most street engines have the best power output(are most efficient) with a dynamic compression of 7.5-8.5:1. With out having actual CC volumes and measurements of your parts my quick calculations are as follows. Using a stock 3.498" bore, 4.250 stroke, and a ball parked 7.4375/7.440 rod length with the given static compressions.

With static compression set at 9.25:1. The EV13 with a 31 intake valve close puts the dynamic compression up at around 8.8 to 8.85:1.

If not set up properly this is a recipe that can provide favorable conditions for pinging/detonation as it may run hot. Requiring you to pull back the timing to control engine temps and detonation, thus cutting power. Or make you one of those guys who is always on the hunt for "good gas".

With the factory 8.5:1 static compression, I work it out to be around 8.0 to 8.1:1 dynamic compression. Putting it right in the sweet spot for trouble free operation. Which may allow you to start with more timing and add timing more aggressively, thus building power sooner and higher peak numbers VS the 9.25:1 static compression combination that could be a troublesome.

Again these are just quick calculations, but are enough that to me, I would question the changing of the compression, the rest of the setup(head/ piston cc, valve/port flow, exhaust) and or the choice of cam.



flstffxe, i was gonna get into it but because its a oil forum really and finn seemed convinced, i wasnt gonna get in depth as you did, absolutely correct what you said in your post!!! with today gas, stock compression for a daily reliable driver is plenty and for the setup that Finn is working to achieve. so be it, its gonna happen anyways. Finn just make sure those neck bearings are in good shape!! enjoy the winter boys, its gonna be a long one.

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