TheSamba.com :: View topic - Scat Adjustable Push Rod Tube Orientation

Thu Aug 13, 2009 6:54 pm

I hope I will be installing my Scat spring loaded push rod tubes tomorrow but i have a question on which end goes in the case and which end goes in the head. In the picture below from the right side of the picture the tube to the far right is where the o-rings go on and the one directly to the left of it is the one the spring fits inside. Which end should go where?

Fri Aug 14, 2009 5:27 am

Fat end goes in the case.

Fri Aug 14, 2009 11:56 am

A good example is on the Bonneville Speed Week thread (2nd pic down). Big end to case and small end to head. Make sure your push rods clear the small end of the tube throughout its stroke. I had to give up "my" anodized gold colored wet dreams when my .375 dia pushrods came to within .002 during stroke. After rehibilitation and theropy, I now flip flop between stock tubes and cheap empi Stainless Steel windage tubes. I'm curious if the two piece tubes collect alot of dirt in the big end that points up to heads. Can you pack this area with something to keep it clean?

Fri Aug 14, 2009 12:29 pm

Thanks for the info. My motor is stock so I don't think I should have any clearance issues should I? This is going into my buggy, I have 1 leaking and several dented tubes so thats why I am replacing them with these. I also bought some Empi push rod tube protectors but I still can't find any pictures of them installed.

Fri Apr 13, 2012 11:05 pm

Mine were installed the opposite way, there is lots of miles on the engine with no problems. I've read that there are pros and cons to installing them this way. Is it o.k. to install with Fat end in head??

Sun Apr 15, 2012 6:32 am

What's the overall opinion of these tubes? Are they the best?

Sun Apr 15, 2012 11:01 am

They're like "windage" pushrods tubes, so the "long" end where the seal is installed goes on case side.

Sun Apr 15, 2012 11:36 am

So what's the worst that can happen if they are backwards like mine? A oil leak?

Sun Apr 15, 2012 12:13 pm

Its my understanding the bigger end goes toward the head to accomodate clearance for the pushrod, especially with higher lift rockers

Sun Apr 15, 2012 4:55 pm

chrisflstf wrote: Its my understanding the bigger end goes toward the head to accomodate clearance for the pushrod, especially with higher lift rockers
Well that's the way mine are installed, so does that mean that everyone else is wrong?

Sun Apr 15, 2012 9:02 pm

I think the big mouth tubes will only go 1 way due to the size of the opening.I have a set on my 2028 no leaks at all.I also swedge the washers on to the tubes so they dont get lost or runn offt of the mouth.

Sat May 05, 2012 8:45 am

I tried to install them with the fat side toward the block and they all leaked.I spun them around and now they all don't leak. I guess I'll leave them like this until something happens.

Sat May 05, 2012 8:54 am

chrisflstf wrote: Its my understanding the bigger end goes toward the head to accomodate clearance for the pushrod, especially with higher lift rockers

Thinking about the clearance for pushrods, it would seem that the big end should be toward the heads where the pushrod moves up and down as the rockers go through thier arc. On the engine case side, the lifters keep the pushrods centered.

Sat May 05, 2012 9:28 am

Look @ my previous post, they're "windage" style tubes so the big end goes on case side....

Thu May 11, 2017 7:47 pm

Thought I'd bring this post alive :wink:
I just noticed that the Jaycee billet tubes are to be installed just like my scat ones which are backwards with the male end in case and larger female into head I agree that this seems backwards for draining oil back to the case because you are relying on o rings to stop a leak Scat confirms that the larger tube with the spring inside goes to the case and the smaller to the heads - i know I barely have enough clearance for my push rods with my scat ones having the large end at the head and they wouldn't clear if they were installed "correctly". My newest thought is why would it matter which way they're installed? Oil flows through them in BOTH directions anyhow
Thoughts?

Thu May 11, 2017 9:03 pm

I've never used the two piece ones but it would only make sense to put the big end in the case and the small end in the head. Oil flows out of the head and back to the case. It would be like any other plumbing application we're the male fitting is upstream of the female receiver.

Just my thoughts though.

Thu May 11, 2017 10:19 pm

Large tube goes into the head, smaller end into the case.

Done properly they will not leak. Lube the O-rings with some grease (my preference) or oil. The extra clearance at the head, prevents the pushrods from rubbing, especially with 1.4 rockers, etc.

Oil goes back and forth in the tubes, so the O-rings still need to do their job, even if you were to reverse the tubes.