1993 Sportster XL 883
Screamin Eagle Flat Top 1200cc Pistons
Stock Cams
52cc combustion chambers, ported intake exhaust, standard 883 valves in heads
S&S Shorty E Carb
SS2-R Exhaust
S&S Roller Rockers
Balanced Rotating Assembly
V-Thunder Covert Ignition System
Crane Single Fire Coil

Dyno Results:
http://www.hr3rdgen.org/gallery/data/3067/28093-Sportster-Dyno-Tune-08APR05.jpg

Stock flat top pistons with 52cc chambers? Holy compression Batman.

Great #'s loads of TQ. Do a copression test.(with the throttle held wide open)

Holy Compression is right! Right on man! Does she want to rip your arms out of the socketts when you get on it?

Just a quick question. Is a dyno run worth it when you gain less than 1 h.p. and lose a .5 of torque. HD1200R what do you think? It is nice to know where your bike is at but you did not gain anything from the tuning. I suppose you got it right the first time and no tuning was required. Are you happy? Did I forget to say 93 was the best year for sporties.

Narley, where were you on the thread where hdlite was talking about his 170h.p. bike. Needed some backup to test this with the b.s. meter.

Narley, where were you on the thread where hdlite was talking about his 170h.p. bike. Needed some backup to test this with the b.s. meter.

It sounds a bit fishy to me as well. But I think the meter is pegged

Just a quick question. Is a dyno run worth it when you gain less than 1 h.p. and lose a .5 of torque. HD1200R what do you think? It is nice to know where your bike is at but you did not gain anything from the tuning. I suppose you got it right the first time and no tuning was required. Are you happy? Did I forget to say 93 was the best year for sporties.

Narley, where were you on the thread where hdlite was talking about his 170h.p. bike. Needed some backup to test this with the b.s. meter.

BS? You don't know a hell of alot about twin cam motors if you think that kind of power is BS from a 124". 160-180whp is pretty common if its done right. I have seen 74" street motors make in excess of 120whp,thats 48 cubes smaller in perspective. Is that BS too? Time to drop the "small man syndrome" complex here. Its pretty prevailant with XL owners.

Barry1967: You we're pretty quick to pull that last post in the other thread, what was your point with my edit?

Barry1967: You we're pretty quick to pull that last post in the other thread, what was your point with my edit?

My error that's why I pulled it. I had the threads mixed up

Time to drop the "small man syndrome" complex here. Its pretty prevailant with XL owners.


We're not the ones braggin about our big twinkie :rolleyes:

We're not the ones braggin about our big twinkie :rolleyes:Nope, but this bullitin board though is loaded with threads on XL owners like yourself trying to justify your bikes, and your status of how your perceived upon with the riders on full sized HD's with silly apples to oranges comparisons,"kill stories",and other hogwash. Very rarely do I see threads on other HD bullitin boards where HD riders on full sized HD's and choppers even concern themselves with how XL riders and enthusiasts percieve them, let alone their bikes. And if you think that your not guilty of this yourself personally, I would be glad to post up some of your own past comments on this ludicrious subject.

Nope, but this bullitin board though is loaded with threads on XL owners like yourself trying to justify your bikes, and your status of how your perceived upon with the riders on full sized HD's with silly apples to oranges comparisons,"kill stories",and other hogwash. Very rarely do I see threads on other HD bullitin boards where HD riders on full sized HD's and choppers even concern themselves with how XL riders and enthusiasts percieve them, let alone their bikes. And if you think that your not guilty of this yourself personally, I would be glad to post up some of your own past comments on this ludicrious subject.

Doesn't matter anymore. I am just going to watch now. Have a nice time on this forum, if you decide to stay.

Oh, by the way, I don't have to justify myself to anyone, obviously though, you do.

Doesn't matter anymore..........................

............Oh, by the way, I don't have to justify myself to anyone, obviously though, you do.

Typical. No surprise to your hypocritical response.

And if you think that your not guilty of this yourself personally, I would be glad to post up some of your own past comments on this ludicrious subject.

Ok, show me some. I'll wait.

Just a quick question. Is a dyno run worth it when you gain less than 1 h.p. and lose a .5 of torque. HD1200R what do you think? It is nice to know where your bike is at but you did not gain anything from the tuning. I suppose you got it right the first time and no tuning was required. Are you happy? Did I forget to say 93 was the best year for sporties.

Narley, where were you on the thread where hdlite was talking about his 170h.p. bike. Needed some backup to test this with the b.s. meter.

I think it was worth it. We only went up one jet size and the timing was on the money. What made it worth the time and money was knowing 100% that the bike is right. It also gives me a base to start with for when I do the next mods. Next step will be the XB heads and N4 cams. :)

Oh yeah.. 93 SPORTIES ROCK!!!!!!!!! :D :band :sporty:

With the bashing and twinkie comparisions, could you guys carry it on to another thread? It's not needed here.

Thanks.

Stock flat top pistons with 52cc chambers? Holy compression Batman.

Believe it or not, the compression is only 10.48:1

Believe it or not, the compression is only 10.48:1


Just out of curiosity, how did you come to that? I have 54cc chambers with wiseco 8.5cc dish pistons and am at 10 to 1. Are you running real thick gaskets? or deep valve pockets?

Sorry bout the hyjack, Ralph started it :D

Just for reference: Try this page.
Compression calculator (http://www.rosspistons.com/calculator.php)

no prob.

I'm just running stock HD gaskets and the standard SE pistons. I think standard 883 heads are 48cc. I'm not sure on the 40+ heads though. the compressed squish depth in inches was .0725. If you use Ross's calculator http://www.rosspistons.com/calculator.php the compression ratio will come to 10.46:1 Sorry I was off .02 points. It's probably a little bit less since I did not measure the valve pockets.

no prob.

I'm just running stock HD gaskets and the standard SE pistons. I think standard 883 heads are 48cc. I'm not sure on the 40+ heads though. the compressed squish depth in inches was .0725. If you use Ross's calculator http://www.rosspistons.com/calculator.php the compression ratio will come to 10.46:1 Sorry I was off .02 points. It's probably a little bit less since I did not measure the valve pockets.

Factory gaskets are .045-.060 or so I think. .0725 is one thick ass gasket.
I'm not doubting you, just trying to make sure the numbers are right.

What was your deck height?

The .0725 includes the compressed base and head gasket. I had the numbers for each but I can't find that sheet. Deck height is 0. It's completely flat across the piston and cylinder

Don't include the base gasket in that equation. It is below the piston and therefore not relevant in the compression formula

Only the deck height counts in the equation.

A factory base gasket is .020

then it's 10.51 if I remove the base gasket. I'm pretty sure that I'm supposed to include it though.

This is the info that i went by to help me figure out the compression... http://www.nightrider.com/biketech/xl883_to_1200_page04.htm

Did you go .030 on the pistons or are they factory 3.498?

I came up with 11.12 to 1
3.528 bore/ or 3.498 if stock bore. 3.812 stroke, .052 gasket, .0001 deck, 0 dish and 2 cyls.


Ah, it doesn't matter. Nice job getting it together and enjoy your new found power.

I stayed at 3.498 for piston size. With the gaskets, I measured them in multiple areas with the vernier calipers. I'm 99% sure my numbers are correct. Like you said though, it doesn't matter. What does is that she's together and running well at that. :)

Out of curiousity though.. what numbers is your bike pushing?

Great #'s loads of TQ. Do a copression test.(with the throttle held wide open)

I'll be tinkering with the bike some tomorrow morn and will run a compression check. I'll let you know what I get.

I stayed at 3.498 for piston size. With the gaskets, I measured them in multiple areas with the vernier calipers. I'm 99% sure my numbers are correct. Like you said though, it doesn't matter. What does is that she's together and running well at that. :)

Out of curiousity though.. what numbers is your bike pushing?

Well, with the 1200R heads iit made 83HP and 81ft lbs. I now have a set of 04 883 heads I had done the same way except it has smaller valves 1.715/1.480 and combustion chamber with a true 10 to 1.. Just got it together and am waiting for a carb bracket to get it completely finished. Once I get about 200 miles on it it wil go back on the dyno for a retest.

And what'd you do with the 1200R heads? Wanna let go of them for a price? :D The 83 heads should help bump your torque up. Can't wait to hear the results!

And what'd you do with the 1200R heads? Wanna let go of them for a price? :D The 83 heads should help bump your torque up. Can't wait to hear the results!

I sold em to a guy here on the forum in England. Whiffy has em now.

damn.. Day late and a dollar short. congrats on the sale though!

Why n4's and not n8's or 9's. I have the eights and it runs great. Just curious. Do these cams make more power than the 8's and 9's or is it something else you are after.

Just a bit heavy on the duration. Maybe with more compression but 10 to 1 I don't think would be enough.

8's or especially 9's would tend to push the paek further up the revs....

N4's should work well with the philosophy that is behind JET heads

It's a mess of a story about the cams. The shop was supposed to install larger valves and do some other work that was never done. With all of this stuff that was promised and not done was a set of custom grind cams. They said that they had the cams but then mysteriously grew legs. Ended up just telling them to get me the N8's but ended up with N4's. At that time I was just happy to see a set of cams in my hands that were better than stock. It wouldn't have mattered though since the headwork was not done.

Since I have the N4's I'm going to give them a try and see how they do. I might go up to N8's but I am having too much fun with the bottom end torque. :)

Just a quick question. Is a dyno run worth it when you gain less than 1 h.p. and lose a .5 of torque. HD1200R what do you think? It is nice to know where your bike is at but you did not gain anything from the tuning. I suppose you got it right the first time and no tuning was required. Are you happy? Did I forget to say 93 was the best year for sporties.

Narley, where were you on the thread where hdlite was talking about his 170h.p. bike. Needed some backup to test this with the b.s. meter.



Ha ...glad I didnt.
Two things, first if he doesnt have a dyno or a time slip he is subject to guessing...maybe a well educated guess, but there is so much grey area in claimed horsepower. So I wouldnt have payed any attention to a horsepower claim. My only take on this is the guy with the twin cam has missed one important pattern developed here at this site....we try not to talk claimed horsepower...most here have learned to get the facts...and subsequently learned the hard way....that claimed horsepower is often inflated, and its tough on the emotions when the dyno tells ya you have come up short...thats why we need mastercards.....
Secondly well done big cubes can do that kind of power and more. Big money can buy big numbers. Heres a friend with more money than me....120 inches .
http://img.photobucket.com/albums/v700/Narley/Harley%20racing/joeysdynosm.jpg

Hey Narley ... have ya got a chart on that one without the Nitrous????

Thems is GOOOOOOOD numbers ....would be a sh*t load of fun to ride

Hey Narley ... have ya got a chart on that one without the Nitrous????

Thems is GOOOOOOOD numbers ....would be a sh*t load of fun to ride


That is no nitrous. they rarely ever ran nitrous , might not have a pull on the juice. Its a merch 120 @ less than 9-1 If I remember right. Then turbo'd.

Ahhh the Turbo explains the torque curve.......

I was lookin at the curve and thought a soft/smooth nitrous boost at around 2700...

didn't think of a turbo.DOH!!!

aaahhhhhhh.......turbo. Now that looks like nice power! I could use summa that. Probably too much on the street (cept if you hate to be beaten from the lights by a fireblade).

Stevo, Mr JET says N2 works better than N4, for tourque. N4 has too much duration apparently.

So I went an got me some N2's to fit the 2004 1200 JET heads Barry sold me. Got my jugs back and now waiting for sunny weekend to put it all back together. Anyone wanna set of N4's, 883 heads and 1200 jugs/conversion dished pistons?

Whiffi

Hey Whiff, where ya been? You still don't have those heads on yet, Geez :)

Let us know how ya like it. That setup worked well for me and you should like it as well, I just wanted more :D , I know it's a disease.

Hi mate,

Those heads will get on the bike as soon as I can get them on...We are still on 5 degrees C in the mornings here, with sub zero overnight...roll on May and June for better weather.

I had to wait 4 weeks to get the 883 jugs bored and matched to the pistons, and send them to Kent to a man who knows how to bore Harley jugs...I also had to wait for the N2's to arrive on back order from the USA... such is life :(

I can hardly wait....

Whiffi

I might be interested in the n4's, How much?

Well, I paid £100 for them, in good secondhand condition. By the time we add shipping I expect you could buy a new set for the same price.

Remember, parts in the UK are normally the dollar price in pounds, so we have to pay double what you pay for Harley parts in real terms.

Whiffi