Author Topic: S&S 117"/124" Cylinders  (Read 678 times)

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Offline Nastytls

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S&S 117"/124" Cylinders
« on: July 18, 2018, 04:18:45 PM »
Are the S&S cylinders the same for their 117" and 124"? So if I have a 117" now and I add the longer stroke crank will the cylinders still work?

Offline Ohio HD

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Re: S&S 117"/124" Cylinders
« Reply #1 on: July 18, 2018, 04:21:56 PM »
No, 1/8" difference in height, +/- a few depending on which 124 cylinders.
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Offline ndmp40

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Re: S&S 117"/124" Cylinders
« Reply #2 on: July 18, 2018, 06:17:07 PM »
Can the 0.125 be dealt with by using a shorter rod? :idunno:

Offline TorQuePimp

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Re: S&S 117"/124" Cylinders
« Reply #3 on: July 18, 2018, 07:34:30 PM »
Can the 0.125 be dealt with by using a shorter rod? :idunno:

Yes

Works well

Offline dsvracer

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Re: S&S 117"/124" Cylinders
« Reply #4 on: July 19, 2018, 06:10:55 AM »
replacing the connecting rods seems like a lot of work, how about using some stroker plates under the cylinders ?? just thinking out loud here.
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Offline Ohio HD

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Re: S&S 117"/124" Cylinders
« Reply #5 on: July 19, 2018, 06:23:45 AM »
Plates is what I would try first as well.

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« Last Edit: July 19, 2018, 06:41:15 AM by Ohio HD »
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Offline jmorton10

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Re: S&S 117"/124" Cylinders
« Reply #6 on: July 19, 2018, 08:41:24 AM »
Man, I haven't seen or heard of stroker plates in years.

I built a Panhead in 1970 with 5" stroke flywheels (I had a flywheel truing stand attached to the marble coffee table in my family room at the time).  Longer cylinders where not available back then, & stroker plates where basically the only option.  I had a very understanding Wife who watched me assemble a rigid chopper in the family room all Winter that year.  She put up with a lot of sh!t over the years (including a prison stint at one point).

That motor was an absolute beast until it broke the sprocket shaft in 1/2 flush with the left side engine case LOL..  We are still married (yesterday was our 39th wedding anniversary & we where together for at least 6 years before we married, she has been absolutely amazing over the years.

~John
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Offline rigidthumper

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Re: S&S 117"/124" Cylinders
« Reply #7 on: July 19, 2018, 08:51:57 AM »
Jason at C&S either made some or had some made- might ask him.

Offline Nastytls

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Re: S&S 117"/124" Cylinders
« Reply #8 on: July 19, 2018, 09:51:49 AM »
Does S&S make an off the shelf crank with the necessary shorter rod?

Seems like if I want 124" I'd be better off starting over.

Offline rigidthumper

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Re: S&S 117"/124" Cylinders
« Reply #9 on: July 19, 2018, 10:31:17 AM »
SE 4 5/8" wheels have 7.575 rods.

Offline Ohio HD

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Re: S&S 117"/124" Cylinders
« Reply #10 on: July 19, 2018, 10:35:47 AM »
You can always just buy new cylinders, and yours even being used have value. Next guy bores to 0.010" and has a 117" motor with seasoned cylinders. 


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Offline ndmp40

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Re: S&S 117"/124" Cylinders
« Reply #11 on: July 19, 2018, 11:04:47 AM »
Perhaps Cometic can make a thick base gasket????// :idunno:

Offline Ohio HD

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Re: S&S 117"/124" Cylinders
« Reply #12 on: July 19, 2018, 11:21:01 AM »
You would just use stroker plates. A gasket that thick is going compress and will leak over time. And decently equipped job shop with a laser can cut a set of plates out of stainless or aluminum easily. Then have them surface ground to the thickness you want. They do this stuff every day, just maybe not for HD parts. 
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Online PoorUB

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Re: S&S 117"/124" Cylinders
« Reply #13 on: July 19, 2018, 12:03:32 PM »
I am sure Commetic could do something for stroker plates. It wouldn't be a gasket, but two gaskets with an aluminum filler. I asked them about a thicker head gasket for my Yamaha R1 and they would make one for $125. The OEM was about $100 so it was a fair price.

You could go with stroker plates and Yamabond on both sides.
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Offline Ohio HD

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Re: S&S 117"/124" Cylinders
« Reply #14 on: July 19, 2018, 12:07:21 PM »
I wouldn't use a sealer only. Use two gaskets, it's been done that way since the 50's. It works.
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Offline ndmp40

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Re: S&S 117"/124" Cylinders
« Reply #15 on: July 19, 2018, 12:31:10 PM »
You can always just buy new cylinders, and yours even being used have value. Next guy bores to 0.010" and has a 117" motor with seasoned cylinders.

This is probably the most sensible way forward. 

Offline Ohio HD

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Re: S&S 117"/124" Cylinders
« Reply #16 on: July 19, 2018, 12:40:40 PM »
You can always just buy new cylinders, and yours even being used have value. Next guy bores to 0.010" and has a 117" motor with seasoned cylinders.

This is probably the most sensible way forward.


I think so. Getting custom made plates won't be free, so unless you can do it yourself. I'd go this route.
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Offline Nastytls

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Re: S&S 117"/124" Cylinders
« Reply #17 on: July 19, 2018, 05:19:58 PM »
You can always just buy new cylinders, and yours even being used have value. Next guy bores to 0.010" and has a 117" motor with seasoned cylinders.

This is probably the most sensible way forward.


I think so. Getting custom made plates won't be free, so unless you can do it yourself. I'd go this route.

Yeah, I guess it is that it is.

Offline Nastytls

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Re: S&S 117"/124" Cylinders
« Reply #18 on: July 20, 2018, 04:04:20 PM »
Stock flywheel rebuilt. S&S cylinders and pistons.

Offline TorQuePimp

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Re: S&S 117"/124" Cylinders
« Reply #19 on: July 20, 2018, 06:05:52 PM »
Flywheels cost the same within a few dollars

You already have cylinders

Several vendors can get you pistons any way you need them with the correct changed

And you are ready to go

Several "shorter rod" 124's in the Dyno section from 140 horse to 170