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> Mounting dial indicator on head
watsonrx13
post Mar 26 2010, 03:58 PM
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I'm in the process of checking the lift of the new cams I purchased from Jake. I would like to verify that I have the dial indicator positioned correctly to check the lift. Is this correct?

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-- Rob
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McMark
post Mar 26 2010, 06:00 PM
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It's pretty good. Can't really tell because your two pictures are nearly 180* apart, which means it's essentially the same perspective. Take two pictures 90* apart (on from the 'front' and one from the 'left').
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McMark
post Mar 26 2010, 06:04 PM
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See....


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URY914
post Mar 26 2010, 06:16 PM
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Why are you checking this?
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ME733
post Mar 26 2010, 07:01 PM
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......................I would suggest the following.....1) Rig up an entirely different way to mount and locate the dial indicator.( a c-clamp to the D.I. base and head or fins.).OR use the intake manafold studs for the plate/ D.I. location...2). you want to have ALL the hold down nuts for the rocker arm shaft studs, torqued properly.(with out your plate possably distorting alignment of R.A shaft.3). INSTALL and tighten the adjuster nuts.4) determine how you will measure the cam-@ .020- or @.050 ths...and ensure the D.I. has complete travel..(plus enought extra to keep tension on the guage/dial.)., from completely open to closed...and of course the 50% lift/rocker arm alignment completed...........................murray
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watsonrx13
post Mar 26 2010, 09:22 PM
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Thanks guys. I'll realign the DI to be more parallel with the valve. The plate isn't interferring with the RA, but I'll check another location for the plate.

-- Rob
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watsonrx13
post Mar 26 2010, 09:23 PM
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QUOTE(URY914 @ Mar 26 2010, 07:16 PM) *

Why are you checking this?


Installing one of Jake's complete cam kit.

-- Rob
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McMark
post Mar 27 2010, 01:37 AM
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Aligning the dial indicator is a PITA. (IMG:style_emoticons/default/wink.gif) You have my sympathy.
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watsonrx13
post Mar 27 2010, 04:31 AM
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QUOTE(McMark @ Mar 27 2010, 02:37 AM) *

Aligning the dial indicator is a PITA. (IMG:style_emoticons/default/wink.gif) You have my sympathy.

Thanks for the sympathy... I've got ALL day to get the measurements. I'll take more pics...

-- Rob
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McMark
post Mar 27 2010, 09:52 AM
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Yup, keep 'em coming. Remember, 90* apart. (IMG:style_emoticons/default/wink.gif)
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J P Stein
post Mar 27 2010, 10:05 AM
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You need to keep the indicator follower perpendicular (square in 2 directions) to the retainer....it is square to the valve. Eyeballing it is close enuff. For what you are doing the cosine error you'll get is insignificant.
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watsonrx13
post Mar 27 2010, 02:57 PM
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After a hard day working, here's the pics with the dial indicator on the heads.

First shot

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Second shot

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Here's a shot at half the lift, checking the position of the adjustor and the valve.

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So, does anyone see any glaring problems/issues?

-- Rob
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McMark
post Mar 27 2010, 04:27 PM
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Yeah, your pushrod is WAAAAAAY too short. The adjuster screw is nowhere near in line with the valve at half lift. Looks to me to be about 15* off or so, and it should be nearly 0*.


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rudedude
post Mar 27 2010, 04:40 PM
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Did you clearance your rocker arms for the longer swivel adjusters?
Just curious.
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watsonrx13
post Mar 27 2010, 05:08 PM
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QUOTE(rudedude @ Mar 27 2010, 05:40 PM) *

Did you clearance your rocker arms for the longer swivel adjusters?
Just curious.

No, I'm using the standard 1.7l rocker arms. Can you explain what is needed?

-- Rob
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watsonrx13
post Mar 27 2010, 05:16 PM
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QUOTE(McMark @ Mar 27 2010, 05:27 PM) *

Yeah, your pushrod is WAAAAAAY too short. The adjuster screw is nowhere near in line with the valve at half lift. Looks to me to be about 15* off or so, and it should be nearly 0*.


So the valve and the adjuster screw should be exactly in line with each other?
Does the beginning shots look correct?
In Jake's valve train geometry he mentions shims for the rocker arms, would this be necessary for this installation?

Do you have any pics showing the correct 1/2 lift position?

-- Rob
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McMark
post Mar 27 2010, 05:20 PM
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Yes they should be in line. Did you get new pushrods? Did you make your own?
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rudedude
post Mar 27 2010, 05:21 PM
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I believe you need to clearance somewhere in neighborhood of 0.150" so that you get the proper geometry.
There are way more knowledgeable people here than me who know this without searching.

Jule
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McMark
post Mar 27 2010, 05:23 PM
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Here's a sample pic. It's not the clearest, and I can't remember if this is set perfectly at half lift, or just close. But you can see the valve and the adjuster are pretty much in line.


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watsonrx13
post Mar 27 2010, 06:00 PM
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QUOTE(McMark @ Mar 27 2010, 06:20 PM) *

Yes they should be in line. Did you get new pushrods? Did you make your own?

I have new push rods and I purchased the adjustable push rod from Jake.

As rudedude suggested, should I clearance the rocker arms for the 911 swivel seats?

-- Rob
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