124" Project Storm Breaker

[Ohio HD]

The welding is 100% top notch.



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[FSG]

are you going to change the exhaust studs ? 

I use the ones with the ball end BUT do like the HEX ended ones used on the M8s.

[Ohio HD]

I hadn't even thought about that, but yeah it would be the time. I may order the M8 studs, that's a good idea.


A trip to eBay and Bob's my uncle!

Part # 10900015A HD OEM

[MBrown]

Very nice pipe. What are the tubing diameters on the Burns exhaust?

[kd]

You will not be disappointed.  It is loud though.

[Ohio HD]

Very nice pipe. What are the tubing diameters on the Burns exhaust?

The header pipes are 1-7/8", 2", 2-1/8".

[kd]

3" baffle?

[Ohio HD]

Yes, I believe it's three inch.

[Ohio HD]

I have my crankshaft ordered from Darkhorse. Just FYI, as of today they're shipping about 40 days out, they're crazy busy.


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[Hossamania]

Good to hear they are busy.

[Ohio HD]

I updated the parts list in the first post. It should be accurate and complete now.

You can buy an S&S 124 for much, much less than I have invested. The exhaust, throttle body air breather, Power Vision, etc. doesn't come with the S&S motor of course. But it still costs a lot more to build completely new.

This thing better run.

[Ohio HD]

Ready to send my 4.125" bore torque plate model to QCT in Fairfield to be made.

It's not that I don't trust suppliers and vendors I use. It's just that it's my responsibility to make sure everything is correct before I assemble it. I also like to document where everything is so that in the event of problems or rebuild you know where you were, and where you are now.


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[FSG]

This thing better run

 

[jsachs1]

This is what I whipped up to load the cylinders on the Cylinder King, and also to check bores. Speeds up the work.
John

[Ohio HD]

Nice convenient setup John.

[Ohio HD]

I'm on pushrod duty today. Looking for the strongest pushrods that'll hold up against high pressure valve springs and large cam lobes, possibly around the 0.712" to 0.728" lift. Especially when high RPM occurs.

I started by looking at what Smith Brothers offers, as they're also out front with their size specs. I'm starting by calculating the solid area of a 7.4" long tube based on the OD and ID of the pushrod.


Smith Brothers
AHD313B-TC-KIT Twin Cam EZ Install Kit 3/8 X . 134 7/16 X 20 TPI – Also available for M8
.375 x .134
calculated size 0.375 x 0.134 x 7.4
volume of solid   0.7507 CI

(PI()x7.4)x((0.375^2)-(0.107^2))/4

These have more solid volume, about 8.5% more. What I'm not familiar with is the lifter end. They appear to be a larger OD (need to ask SB) and I wonder about fitting inside the lifters retainer clip without possible contact. I assume they do, but wonder about the clearance as they look large.

SB also says these aren't for OEM pushrod tubes, to use SB or Colony. I assume they mean the OEM TC tubes as there's limited clearance when using the longer TC lower tubes. I use the Colony Evo tubes anyway.

These are not easy install, even though they say they're "EZ". But with one lock nut, and more solid mass these will probably be a stronger choice.






Smith Brothers
AHD79SB-TCFI-K   Adj HT Twin Cam 7/16 X .095 Single Taper 5/16 X 32 TPI
.437 x .095
calculated size 0.4375 x 0.095 x 7.4 (these are tapered 0.375 on the head end)
volume of solid   0.6867 cubic inches

(0.333)x π x 7.4 x (0.1875² + 0.1875 x 0.21875 + 0.21875²) = 0.9601
(0.333)x π x 7.4 x (0.0685² + 0.0685 x 0.08475 + 0.08475²) = 0.2734

0.9601 - 0.2734 = 0.6867 CI
 

These I'm familiar with as they're what I normally use.

[kd]

I bought my SB 7/16" X.120 tapered pushrods from Dan Baisley on his recommendation for rigidity for my springs.  They are adjustable but not quick change so the thimble support is deeper into the shaft. The springs Dan chose were for good control of the valve train up to 6200 rpm plus (PSI 1225 dual spring kit) and were of significant weight but not as heavy as the 120R SE / MVA springs I had.  He said they were too strong and in his opinion problematic. 

These pushrods were new to Smith Brother's pushrod line at that time.  They have the ball tip (not the taper) like your first pics in your previous post only a slightly different neck to the base of the adjuster. One other member here posted that he was having contact issues in the lifter clips at that time (2015) due to the shape of the neck to the ball on the lower member.  I hadn't installed mine yet so I called SB and asked some questions.  One of the guys there is the Harley pushrod specialist and tester. (I can't remember his name (John?))  He said he recalled the HTT member I named at that time (but can't remember now) having the issue so they redesigned the tip to give more clearance on the higher lift cams.  He said some lifters (Wood?) were a narrower cup and clip clearance. He sent me a set and when I installed then I checked each one throughout their full range and found them suitable.  I could definitely see a physical difference and where the others could have been a problem with some lifters.  If you do call Smith Brothers ask for the fellow that is on top of the Harley offerings.  I think you'll get all of the answers you need from him.

I believe the pushrod tube issue is as you suspect. These pushrod adjusters are further up the length for rigidity and the OEM pushrod tubes interfere with adjusting.  I used the colony tubes and clips and all was good.

[Ohio HD]

I don't know that they make 0.437" diameter full length adjustable pushrod for Twin Cams. They have 0.375" as I've shown, but those do have a 7/16-20 thread. 

The most common are the quick installs that are 0.437" to 0.375" tapered.

The full length 0.375" diameter x 0.134" wall thickness are what I'm thinking of using.


Smith Brothers Harley Pushrods


Twin Cam 0.375° x 0.134" Wall ~ 7/16-20 thread

[kd]

Actually, I would think they would make whatever you like.  If you speak to the fellow I mentioned he may consider doing them as a proto type for testing. He assured me every set of Harley pushrods were through his program and he personally was involved with the testing. He will know the clearance restrictions (if any) too.

I wanted strength when I bought mine and was told "these" were the ones without overkill top fuel type requirements. Do you think there's any chance you are over compensating?  I do that lots. I like doing it once. If you get the spring and valve assembly weight from Larry and feed SB enough information they should be able to confirm your thoughts or offer alternative choices with their reasons.

[Ohio HD]

I know I don't want 0.437" diameter at the top side. High lift, and longer ratio rockers will have the pushrod swinging like a pendulum at the top.

I'll use the SB AHD313B when I find out that the lower diameter will not be any issues for me.

[Ohio HD]

These 0.375" diameter from Zippers are 0.145" wall, they're solid mass is 3.2% more than the SB 0.375" x 0.134" wall pushrods. They may be made my SB. I'll se if SB sells these, if not I can get them from Zippers.


Zippers 0.375" pushrods with 0.145" thick walls

[Don D]

The SB 7/16 .120 wall offer more rigidity.

[kd]

The taper also works well at the top with a high lift cams arc that uses up a lot of real estate in the pushrod hole.

[Wookie3011]

Is there a downside to the HD SE Premiums adjustables? I to went down this road. I initially had S&S adjustables but the wall thickness gave me pause. I instead opted for HD SE adjustables. Glad to see more progress on your build. Eagerly watching.

[Don D]

Consider using the same studs, head bolts, and head material and thickness as what will be on the engine for torque plates. Mine are the same as John Sachs uses, same machine also.