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Old 02-05-2012, 03:27 PM   #1 (permalink)
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103 upgrades

I am looking to do a little more upgrading to my 11 sg

So far I have done a heavy breather,propipe and a tune and ended up with 80/100 throttle nice and crisp but the thing still runs hot and really seems to be octane intolerant.

Thinking about doing a little head work,pistons and a cam

I will not use any S&S or woods products nor do I want to go to a 107 I will have the cylinders bored to the next bore size nothing more.

My question is are there any pistons out there that have a different compression height to tighten up the quench a bit or are gaskets enough to do this ?

Does HD sell the valves alone that they install in the CNC factory heads or do you have to purchase the CNC'D heads to get those.

Cams...I am looking for rideability not dyno numbers

the 204 seems like the go to bolt in cam since i am doing a few mods to the heads I would like something similar to the 204 with some lift to compliment the headwork

Thanks all
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Old 02-05-2012, 04:53 PM   #2 (permalink)
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Quote:
Originally Posted by torqueinc View Post
I am looking to do a little more upgrading to my 11 sg

So far I have done a heavy breather,propipe and a tune and ended up with 80/100 throttle nice and crisp but the thing still runs hot and really seems to be octane intolerant.

Thinking about doing a little head work,pistons and a cam

I will not use any S&S or woods products nor do I want to go to a 107 I will have the cylinders bored to the next bore size nothing more.

My question is are there any pistons out there that have a different compression height to tighten up the quench a bit or are gaskets enough to do this ?

Does HD sell the valves alone that they install in the CNC factory heads or do you have to purchase the CNC'D heads to get those.

Cams...I am looking for rideability not dyno numbers

the 204 seems like the go to bolt in cam since i am doing a few mods to the heads I would like something similar to the 204 with some lift to compliment the headwork

Thanks all
Andrews 54H (quiet running) and some headwork keeping the compression at 10 to 1, the factory cnc is done at Wegner Automotive in WI and is a very basic port job, more can be had spending less using the sponsors here on this forum. As for the squish area really no way to know without measuring but for street use I see no reason you need to do anything more than use a 30 thousands gasket.
Just curious but why no woods or S&S products?
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Old 02-05-2012, 05:25 PM   #3 (permalink)
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I'm building a 103" on a brand new 012 Dyna for a guy. I think it's called a Street Bob. It has the dual front head lamps. Anyway,,,I will use the Andrews 54H cams and stock valve train after going over the specs with Gary at Andrew's.

For a mild street motor on pump gas, the 103" heads breath very well from the factory. I am also using the new PCV with the Auto Tune. That will take care of the fueling concerns.

The guy wants to use a set of V&H pipes. The short ones that turn down just before the rear wheel. I tried to explain the theory of scavenging to him, but he wants the looks.

If you want to up the compression on your motor, use the HD P/N 22179-99A cast pistons. That should put you at 10:25-1 compression with the factory 103" heads. Use the +.10 pistons so the machinist can hone your stock barrels to fit the new pistons.

If you are going for "Bang for the buck," leave the heads alone for now. Now if you want more power, get your heads worked over and use Manley valves in them. That will cost a lot more money though. Your call,,,,,.

FYI only, a 103" is nothing more than a 96" bored out to 3 7/8". The same bore as a 95" on an 88" bored out motor. Also, I have it first hand from a very respected Harley race engine builder, that you CAN bore your 96" or your 103" motor to 107" with NO over heating problems. The stock 96" and 103" barrels will work just fine. But, again, if you look at the "Best bang for the buck" theory, going from 103" to 107" would be a big waste of money for the improvement in power you would end up with.

Last edited by muleskinner; 02-05-2012 at 11:49 PM.
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Old 02-05-2012, 06:28 PM   #4 (permalink)
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Raising compression and/or adding performance cams will make it run hotter. You need an oil cooler not more mods.
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Old 02-05-2012, 06:43 PM   #5 (permalink)
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+1 on the 54s and headwork
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Old 02-05-2012, 11:02 PM   #6 (permalink)
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Im 103" ,woods tw 555 cams, dual exhaust, and a power pacc breather.... Very happy here..It rides great, dependable....And.....How cool is this sheet?????????
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Old 02-05-2012, 11:56 PM   #7 (permalink)
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Quote:
Originally Posted by torqueinc View Post
I am looking to do a little more upgrading to my 11 sg

So far I have done a heavy breather,propipe and a tune and ended up with 80/100 throttle nice and crisp but the thing still runs hot and really seems to be octane intolerant.

Thinking about doing a little head work,pistons and a cam

I will not use any S&S or woods products nor do I want to go to a 107 I will have the cylinders bored to the next bore size nothing more.

My question is are there any pistons out there that have a different compression height to tighten up the quench a bit or are gaskets enough to do this ?

Does HD sell the valves alone that they install in the CNC factory heads or do you have to purchase the CNC'D heads to get those.

Cams...I am looking for rideability not dyno numbers

the 204 seems like the go to bolt in cam since i am doing a few mods to the heads I would like something similar to the 204 with some lift to compliment the headwork

Thanks all
you would have to have pistons made with a different pin height not cost effective,dont know but all the cyl seem to be about .030 off.you need to set it up with your new pstons and at tdc measure how far down the piston sits then find a machinist(axtell offers this service)and have them shorten the cylinders whatever the measured dimension is that way you get zero deck height and your head gasket will be your squish dimension. then i would put a 1.9 int valve and 1.57 ex valve do a good valve job and some bowl porting. buy the screaming eagle bee hive springs and the se 259e cams,have done this combo usually yeilds 1 hp per cube and usually little more on the torque side very cost effective
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Old 02-06-2012, 12:13 AM   #8 (permalink)
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If the heads are coming off I am gonna do something to them,have considered doing a little work myself however since i do alot of porting that usually gets me into alot of trouble .....kinda like my 88 inch shovel that i was gonna do a little work to and ended up being over 100 cubes and pretty expensive with the trock cylinders and t&o wheels,STD heads and on and on.
I have been looking at some of the work on here and apreciate the PM's
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Old 02-06-2012, 12:29 AM   #9 (permalink)
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Quote:
the 204 seems like the go to bolt in cam since i am doing a few mods to the heads I would like something similar to the 204 with some lift to compliment the headwork
Andrews just released this cam.
I have a feeling it will be the new flavor,for these stock 103's.
bolt it in. with a good tune it will be a lot of bang for the buck.

57H 18/38 100 236 .560 .184
46/14 106 240 .560 .153
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Old 02-06-2012, 12:40 AM   #10 (permalink)
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strokerjlk is reading this now saying WTF is this?
both of these are bolt (cams) in stock 103 ci

blue is 204
red is 54
the 57 should fall right between these two

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Old 02-06-2012, 12:53 AM   #11 (permalink)
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The 57 looks like a no brainer,I know the 37 was pretty popular at one time
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Old 02-06-2012, 01:53 AM   #12 (permalink)
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Quote:
Originally Posted by torqueinc View Post
If the heads are coming off I am gonna do something to them,have considered doing a little work myself however since i do alot of porting that usually gets me into alot of trouble .....kinda like my 88 inch shovel that i was gonna do a little work to and ended up being over 100 cubes and pretty expensive with the trock cylinders and t&o wheels,STD heads and on and on.
I have been looking at some of the work on here and apreciate the PM's
give me a call, my name is David 269 317 6544 i may be able to help you.
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Old 02-13-2012, 05:09 PM   #13 (permalink)
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Anyone use a Woods 5-6 in a 103 ?

Was thinking about having a cam custom ground,because i cannot help myself very similar to this cam.....plenty of lift short duration and narrow lsa
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Old 02-13-2012, 07:22 PM   #14 (permalink)
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Have the 255's and 10.5:1 pistons in my 103, I didn't get the dyno sheet, but it was 97 and 108 dealer tuned with super tuner pro. Mine never ran hot this summer.
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Old 02-13-2012, 07:55 PM   #15 (permalink)
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Headwork or stock ?
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