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Author Topic: little secret on 110" heads !  (Read 31868 times)

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gremlush

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little secret on 110" heads !
« on: December 24, 2008, 03:21:02 PM »

I have been porting H-D heads since 1978 {sold biz last year} anyway , I always liked to use 89-90 %  valve to seat ratio . The H-D 110" heads have a 93 % ratio on the intake !!!!!!! YOU WANT POWER ,CHEAP ?   Put in a 2.125 intake valve { H-D #  18190-08}  $15.50 ea. } that will get you a 90.5 % ratio and do a 4 angle seat cut ,  'mill' the heads .030-.040  and use a Cometic .030 head gasket and a cam.  Dewey
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mr_magoo

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Re: little secret on 110" heads !
« Reply #1 on: December 24, 2008, 09:49:23 PM »

Interesting thanks for the info.
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PR3VS56

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Re: little secret on 110" heads !
« Reply #2 on: December 24, 2008, 09:58:53 PM »

Hey Dewey, thanks for the great tip.  You got a good name after 30 years -- that's sayin' a lot right there.  How's everything going on the other side of retirement? 
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gremlush

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Re: little secret on 110" heads !
« Reply #3 on: December 25, 2008, 08:55:37 AM »

Retirement is 24/7 , thinking about going back to work to rest. Gotta run now ,Gunsmoke is on. Dewey
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BigMo

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Re: little secret on 110" heads !
« Reply #4 on: December 25, 2008, 09:46:00 AM »

Hmmmm, thats interesting. I own a '07 FXDSE, with the SE110 motor. I have been sorta going through my mind about mods to get more power out of the motor. Wanting in the neighborhood of 100-110hp without to much work. I was figuring on new pistons and cam, with some head work. So you say open up the intake even more? I thought it was 2" already? But put in larger valve with work, mild port, cut head, thin gasket and cam will get me there? What kind of comp are you talking about, around 10:1? That would be cool, with a cam in the 590 lift, 246 dur. int. close of 40-44 should make it work?

BigMo
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Mr D

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Re: little secret on 110" heads !
« Reply #5 on: December 25, 2008, 11:08:34 AM »

I have been porting H-D heads since 1978 {sold biz last year} anyway , I always liked to use 89-90 %  valve to seat ratio . The H-D 110" heads have a 93 % ratio on the intake !!!!!!! YOU WANT POWER ,CHEAP ?   Put in a 2.125 intake valve { H-D #  18190-08}  $15.50 ea. } that will get you a 90.5 % ratio and do a 4 angle seat cut ,  'mill' the heads .030-.040  and use a Cometic .030 head gasket and a cam.  Dewey

Perfect Set Up For The SE 251 grind  :2vrolijk_21:
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Re: little secret on 110" heads !
« Reply #6 on: December 25, 2008, 01:52:06 PM »

I would think that using a larger valve and sinking it deeper into the seat would limit your ability to do future head rebuilds and would require you to be replacing seats on a rebuild instead of recutting them. And instead of machine work on the heads, you can use 10-10.5:1 pistons to get the CR up. And wouldn't the extra power you get from doing this mod, come at the top at the expense of the bottom/mid? Just throwing out some thoughts and questions out there Dewey, not questioning your findings. Thanks. Merry XMas! ;)

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gremlush

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Re: little secret on 110" heads !
« Reply #7 on: December 25, 2008, 05:39:42 PM »

let me 'spain' a little.  When you have 93% seat to valve {1.930 dia.} with a 2.080 valve ,you need to look HARD to see the 45 degree cut and forget about the 60 degree ! You have nothin but a big hole. Nothing to cut your angles on ,right ? By going with a bigger valve {.045 bigger}  you can do a 30-45-60-70 cuts. YES ?  THE STOCK VALVES ARE 'BACK CUT'  30 DEGREE. its all about making the Y , with the back cut on the valve and the cuts on the seat. Look at a Y , bigger on the top and then narrows down ,yes. Just remember 1 thing , 80% of your air flow is controlled by the valve and the seat. The only other way is to weld up the ports. The stock 110"  heads flow BAD. once you 'fix' the valve and the seat {cuts} they do fine. Whatever ,been doing this stuff for over 30 years,not trying to sell ANYTHING. Dewey  Merry XMAS and GOD BLESS.
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Iglide

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Re: little secret on 110" heads !
« Reply #8 on: December 25, 2008, 06:04:17 PM »

let me 'spain' a little.  When you have 93% seat to valve {1.930 dia.} with a 2.080 valve ,you need to look HARD to see the 45 degree cut and forget about the 60 degree ! You have nothin but a big hole. Nothing to cut your angles on ,right ? By going with a bigger valve {.045 bigger}  you can do a 30-45-60-70 cuts. YES ?  THE STOCK VALVES ARE 'BACK CUT'  30 DEGREE. its all about making the Y , with the back cut on the valve and the cuts on the seat. Look at a Y , bigger on the top and then narrows down ,yes. Just remember 1 thing , 80% of your air flow is controlled by the valve and the seat. The only other way is to weld up the ports. The stock 110"  heads flow BAD. once you 'fix' the valve and the seat {cuts} they do fine. Whatever ,been doing this stuff for over 30 years,not trying to sell ANYTHING. Dewey  Merry XMAS and GOD BLESS.

What I hear you saying is that the poor flow characteristics of the stock SE 110 heads is a result of the stock intake valves and seat cut. Is that correct?

And... a Very Merry Christmas to you! Thanks for the info.
« Last Edit: December 25, 2008, 06:17:24 PM by Iglide »
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Re: little secret on 110" heads !
« Reply #9 on: December 25, 2008, 06:36:34 PM »

let me 'spain' a little.  When you have 93% seat to valve {1.930 dia.} with a 2.080 valve ,you need to look HARD to see the 45 degree cut and forget about the 60 degree ! You have nothin but a big hole. Nothing to cut your angles on ,right ? By going with a bigger valve {.045 bigger}  you can do a 30-45-60-70 cuts. YES ?  THE STOCK VALVES ARE 'BACK CUT'  30 DEGREE. its all about making the Y , with the back cut on the valve and the cuts on the seat. Look at a Y , bigger on the top and then narrows down ,yes. Just remember 1 thing , 80% of your air flow is controlled by the valve and the seat. The only other way is to weld up the ports. The stock 110"  heads flow BAD. once you 'fix' the valve and the seat {cuts} they do fine. Whatever ,been doing this stuff for over 30 years,not trying to sell ANYTHING. Dewey  Merry XMAS and GOD BLESS.

Wasn't about buying or selling, just trying to learn from those who are knowledgeable. Thank you for that explanation Dewey! :2vrolijk_21:

Hoist! 8)
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gremlush

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Re: little secret on 110" heads !
« Reply #10 on: December 25, 2008, 09:11:29 PM »

Just remember ,you can't hold whats NOT in your hand.
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skyhook

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Re: little secret on 110" heads !
« Reply #11 on: December 26, 2008, 09:13:18 AM »

you da man dewey...thanks for a simple solution
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happyman

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Re: little secret on 110" heads !
« Reply #12 on: December 26, 2008, 08:55:38 PM »

Ok  Dewey. sounds like a plan but who  we going to get to do that for us .   how many  porter so you feel  would  do this for those of us that would by chance want to do i it ??   you  ??
 i have a spare  set of the  110"  heads i am looking to do something with,  and may be interested in trying  your bigger valve suggestion~   thanks

 Happyman
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gremlush

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Re: little secret on 110" heads !
« Reply #13 on: December 26, 2008, 09:23:05 PM »

I am sure the guy I sold my biz too would do it,he name is Don. Good man. Look on my web site and then 'click' on his. www.deweyspegs.com   or you can do it yourself. know someone with a 'NEWAY' seat cutter {carbide} and a mill to 'flycut' your heads.  I would but GUNSMOKE is on. Sorry Dewey
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happyman

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Re: little secret on 110" heads !
« Reply #14 on: December 26, 2008, 11:14:25 PM »

you are talking about increasing the intake valve size??
Thanks again
  happy
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