Some technical help for you guys building an engine... - Team Camaro Tech
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post #1 of 15 (permalink) Old Sep 11th, 14, 09:14 AM Thread Starter
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Chris
 
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Some technical help for you guys building an engine...

I have made a decision to do some technical videos and explain some of the ways we do things. The start of this is today.

One question we get all the time is how do I measure for pushrods. We field about 4 of these a week from customers and others just needing some direction. I feel this is an area that the DIY guy is not comfortable with during engine building.

So I hired a videographer and last week we shot a video on how to establish proper rocker geometry so that one can find correct pushrod length. This is our way, Straub Technologies and my staff, to give friends, customers, and performance crowd something that they can use as an educational tool. The method Scott Foxwell uses in the video is the way that it is done here.



If the board wants to make the link to the video a sticky that is fine

Chris

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post #2 of 15 (permalink) Old Sep 11th, 14, 09:33 AM
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Re: Some technical help for you guys building an engine...

Just watched this over on Team Chevelle. Excellent video, Chris! Thank you

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post #3 of 15 (permalink) Old Sep 11th, 14, 09:37 AM
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Re: Some technical help for you guys building an engine...

This video is very understanding for the DIY guys. Never seen one demonstrated and I think it would benefit everyone .

Moderator, how about placing this sticky out there?

Don
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post #4 of 15 (permalink) Old Sep 12th, 14, 08:36 AM
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Re: Some technical help for you guys building an engine...

The video is not working for me...It says "This video has been removed by the user"..

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post #5 of 15 (permalink) Old Sep 12th, 14, 08:46 AM
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Re: Some technical help for you guys building an engine...

Quote:
Originally Posted by knuggles68RS/SS View Post
The video is not working for me...It says "This video has been removed by the user"..
x2

...Dennis

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post #6 of 15 (permalink) Old Sep 12th, 14, 08:54 AM Thread Starter
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Re: Some technical help for you guys building an engine...

http://www.youtube.com/watch?feature...&v=o5is9BsH5OU

Chris

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post #7 of 15 (permalink) Old Sep 16th, 14, 11:09 AM
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Re: Some technical help for you guys building an engine...

Great video. Can you use this method with a hydraulic lifter or is it more accurate to use a solid lifter?

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post #8 of 15 (permalink) Old Sep 16th, 14, 02:42 PM Thread Starter
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Re: Some technical help for you guys building an engine...

Quote:
Originally Posted by DenRS View Post
Great video. Can you use this method with a hydraulic lifter or is it more accurate to use a solid lifter?
Yes you can.

Chris

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post #9 of 15 (permalink) Old Sep 16th, 14, 02:54 PM
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Re: Some technical help for you guys building an engine...

Would you do what is shown in the video but unscrew the rocker adjuster nut the necessary amount of turns (preload inches required divided by number of inches of adjuster nut per turn) to account for recommended lifter preload? Wouldn't the pushrod be short by the amount of needed lifter preload if this method is followed exactly?
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post #10 of 15 (permalink) Old Sep 16th, 14, 10:01 PM
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Re: Some technical help for you guys building an engine...

I don't see how to use this method with stock rocker arms unless someone has an idea how to find the centerline through the rocker.

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post #11 of 15 (permalink) Old Sep 17th, 14, 01:56 PM
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Re: Some technical help for you guys building an engine...

The centerline through a stock rocker runs from the center of the pivot (if the pivot ball was a sphere) to the face of the rocker where it contacts the valve tip. You would need to determine the true radius of the sphere that is formed by the ball seat, and then mark the center of the sphere on the outside of the rocker. There may be other ways to do it, but I think you could purchase a ball bearing that is the same diameter of a stock rocker pivot ball (mcmaster has them), and then use a caliper to scribe the centerline of that ball on the outside of a rocker (working off the bottom of the ball as your datum, through the stud hole in the rocker arm). The hardest part is figuring out the diameter/radius of the rocker pivot seat.
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post #12 of 15 (permalink) Old Sep 17th, 14, 08:56 PM
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Re: Some technical help for you guys building an engine...

Great timing. Thanks for the video. I'll be doing this next week.
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post #13 of 15 (permalink) Old Sep 18th, 14, 09:29 AM Thread Starter
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Re: Some technical help for you guys building an engine...

Next video will be Cam Degree Install using Duration Method. It will be later this fall.

With the positive response and suggestions we are going to ASSUME, in future videos, the view knows nothing and go over stuff. I feel stuff like this helps the DIY guy and keeps our industry healthy.

Chris

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post #14 of 15 (permalink) Old Sep 18th, 14, 09:11 PM
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Re: Some technical help for you guys building an engine...

That was pretty awesome Chris. It appeared you were using light weight springs for the measurements unless I missed something. Might want to make that clear that it is easier to do it that way other than full on springs. It's late hope I didn't miss it.

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post #15 of 15 (permalink) Old Sep 19th, 14, 06:59 AM Thread Starter
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Re: Some technical help for you guys building an engine...

Quote:
Originally Posted by kmberjo1967 View Post
Would you do what is shown in the video but unscrew the rocker adjuster nut the necessary amount of turns (preload inches required divided by number of inches of adjuster nut per turn) to account for recommended lifter preload? Wouldn't the pushrod be short by the amount of needed lifter preload if this method is followed exactly?
With a hyd roller you want to add .050" to the length for the preload.

Chris

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