SE 103 kit CR? : V-Twin Forum: Harley Davidson Forums

cmueller · 07-11-2008, 05:54 PM

Anyone know what the CR is with the SE 103 kit, PN#29903-07a, cast pistons? A search of SE parts shows zippo..

claydbal · 07-11-2008, 06:35 PM

dont know about the kit, but factory cvo 103 is around 8.3 with the 253 oem cams.and .052-.058 squish that i have seen. explains the dead bottom end doesnt it?

ceraaa42 · 07-11-2008, 09:17 PM

Is this the kit that comes with the SE255 cams?

If so it is 10.0 to 1. This is also just a tad bit high for those cams as it makes hot start a little tough and could ping if the tune is not spot on. Mine does not ping but if I were to do mine again I'd put in compression releases.

Chris

ceraaa42 · 07-12-2008, 12:00 PM

I just looked in the SE catalog and see the kit you're talking about.
The pics of the pistons in the kit I mentioned above look identical to the kit your looking at so they must be the same.

I'm pretty sure the dealership has a brake down of the parts with numbers in the kit. If they don't have the info on compression ratio but the pistons part numbers are the same as my kit it would be at 10 to 1.

Chris

arealinvestor · 07-12-2008, 01:32 PM

103ci with 10:1 comp that sounds a little high to me!!!!!!!!!!the SE 110 cvo from the factory doesn't have 10 to 1 comp unless you switch to the high comp piston.

claydbal · 07-12-2008, 02:08 PM

Quote:

Originally Posted by arealinvestor

103ci with 10:1 comp that sounds a little high to me!!!!!!!!!!the SE 110 cvo from the factory doesn't have 10 to 1 comp unless you switch to the high comp piston.

the 110 would self destruct at 10:1 with 255 cams.heck, they are self destructing with stock compression------what am i thinkin?

roadkingkruizer · 07-12-2008, 03:43 PM

I would stop on by your local Stealer and ask for the supplement SE parts catalog. The part number for the one used in 07 is "99557-07SE" so the one used for 08 might end in 08. If the new one don't have the info. you need, you can always call the MOCO.

If I had to guess I would say it's no more than 9.0:1 CR with the head gaskets in the kit.

arealinvestor · 07-12-2008, 05:06 PM

Quote:

Originally Posted by claydbal

the 110 would self destruct at 10:1 with 255 cams.heck, they are self destructing with stock compression------what am i thinkin?

Yeah the 255 has to early of an intake close for 10:1 comp.I would use the SE 211.

claydbal · 07-12-2008, 05:25 PM

Quote:

Originally Posted by arealinvestor

Yeah the 255 has to early of an intake close for 10:1 comp.I would use the SE 211.

i would use smething that doesnt have HD stamped on it---------

claydbal · 07-12-2008, 05:26 PM

sorry guys, gotta go, my chinese steak is burning on my korean grill.

arealinvestor · 07-12-2008, 05:28 PM

Quote:

Originally Posted by claydbal

i would use smething that doesnt have HD stamped on it---------

Im starting to agree!!!!!!!!You need a good builder for futher advice.

ceraaa42 · 07-12-2008, 07:01 PM

Quote:

Originally Posted by arealinvestor

Yeah the 255 has to early of an intake close for 10:1 comp.I would use the SE 211.

Interesting you would say that after the info I've given. Not that I'm the now all, because I'm not. But I have built 3 performance engines that ran well, and I also have the kit in my present bike with the 103", SE255 cams at 10 to 1. Don't believe me? Call Mike Stegman at Latus motors, he has built many of these kits sold by Harley (you can verify the dyno sheets on their website). In fact he's the one that told me they come at 10 to 1 and the tuning has to be spot on due to that fact.

My bike runs excellent and has no pinging. But if I were to do it again, I would put in compression releases since it cranks pretty hard on a hot start.

Also don't compare the 110" to the 103", it's a different kit. The heads are different in the 110 as is the swept volumn, so it's not the same.

Take it or leave it,

Chris

Diggerpine · 07-13-2008, 08:42 AM

Diggerpine here; The SE 103 kit, PN#29903-07A does not come with the SE-255 cams. The kit uses the stock cams, I could be wrong but I would say the CR is the same as stock. The only difference would be larger flat-top pistons.

Ride Safe!
Steven

arealinvestor · 07-13-2008, 02:36 PM

Quote:

Originally Posted by ceraaa42

Interesting you would say that after the info I've given. Not that I'm the now all, because I'm not. But I have built 3 performance engines that ran well, and I also have the kit in my present bike with the 103", SE255 cams at 10 to 1. Don't believe me? Call Mike Stegman at Latus motors, he has built many of these kits sold by Harley (you can verify the dyno sheets on their website). In fact he's the one that told me they come at 10 to 1 and the tuning has to be spot on due to that fact.

My bike runs excellent and has no pinging. But if I were to do it again, I would put in compression releases since it cranks pretty hard on a hot start.

Also don't compare the 110" to the 103", it's a different kit. The heads are different in the 110 as is the swept volumn, so it's not the same.

Take it or leave it,

Chris

My .02 is.Running 10 to 1 comp is to much for a cam that has an intake close of 25.The mixture could wind up being over compressed. With that early of a close it cant have much midrange if any at all.Your tuner is absolutely right it has to be turned just right or else it will ping.It also will be hard to start when its warm because there is not enough bleed of compression with that cam.I think that cam for a 103 running 10 to 1 comp is a bad choice.Thats my .02.Then again i do a different style of riding then you do.I like my torque more easily spread out.I like down low/midrange and the torque being carried through until at least 5000-5500rpm.With a close of 25 that 255 cam will have no midrange!!!!!!!!!!!!!!!!!

ceraaa42 · 07-13-2008, 03:29 PM

Quote:

Originally Posted by arealinvestor

My .02 is.Running 10 to 1 comp is to much for a cam that has an intake close of 25.The mixture could wind up being over compressed. With that early of a close it cant have much midrange if any at all.Your tuner is absolutely right it has to be turned just right or else it will ping.It also will be hard to start when its warm because there is not enough bleed of compression with that cam.I think that cam for a 103 running 10 to 1 comp is a bad choice.Thats my .02.Then again i do a different style of riding then you do.I like my torque more easily spread out.I like down low/midrange and the torque being carried through until at least 5000-5500rpm.With a close of 25 that 255 cam will have no midrange!!!!!!!!!!!!!!!!!

Interesting observation, maybe you should look at my ride report and dyno sheet over here;
http://www.v-twinforum.com/forums/dr...et-baffle.html

This bike pulls like an animal from low to midrange. Falls off after about 5000rpm, right where I rarely take this engine. It's bagger, I just ride the thing and when I pass I want it to get going. And I did it without spending lots of money.

Let me know what you think, and as I said; if I were to do it again I'd put in the compression releases.

Chris