Cam swap: It doesn't end at the cam....

Topic: Cam swap: It doesn't end at the cam.... (Read 8688 times) previous topic - next topic

Cam swap: It doesn't end at the cam....

Reply #15 – May 14, 2009, 10:33:40 AM

Cam's in, springs all swapped, bumped the motor once with the checking pushrod and everything's good clearance wise!

Before I pull the pin on new pushrods I want to be absolutely certain on the lifter preload. The cam card and instructions from Flowtech Induction did not specify very clearly. Included with the cam were a set of basic instructions from COMP (because they're the ones who do all of Ed Curtis' grinds)
Those stated .030" plus or minus .010" for lifter preload -- Comp's recommendation for all hydraulic roller cams.

Looking through some old paperwork I had made me come across the cylinder head paperwork from Trick Flow. It had a small section in it on -- you guessed it -- setting up the valvetrain. That stated zero lash plus 1/2 to 3/4 turn on the shaft nut. Sounds as if those two different sources would net a VERY similar end result.

Comp will get a phone call today. I'll e-mail Ed Curtis too.

Side note: I had forgotten that the Summit timing chain had an adjustable gear out front. Only 3 positions -- zero, 4 advance, and 4 retard, but hey I can't really think o many times where people go 2 degrees on a street car...

Cam swap: It doesn't end at the cam....

Reply #16 – May 14, 2009, 10:41:33 PM

Quote from: Kitz Kat;271128

Sounds like my job, had to play with the rain, should be a good growing year.

yeah that,, and blight.

Good for now but if the ground stays wet, bacteria will probably blight out all my beef steak tomatos.

Cam swap: It doesn't end at the cam....

Reply #17 – May 14, 2009, 10:45:25 PM

Quote from: V8Demon;272255

Looking through some old paperwork I had made me come across the cylinder head paperwork from Trick Flow. It had a small section in it on -- you guessed it -- setting up the valvetrain. That stated zero lash plus 1/2 to 3/4 turn on the shaft nut.

sometimes i think being vague protects them in certain ways for liability reasons.

If the instructions were clear, then they would be accountable for thier claims of performance specs.

Cam swap: It doesn't end at the cam....

Reply #18 – May 15, 2009, 07:19:05 AM

Both of the sources I had stated to follow the instrucions for your specific cam if there are any first.

I e-mailed Ed. I await his reply. Getting a hold of Comp on the phone is near impossible. After that I can measure these pushrods up and finish.

Cam swap: It doesn't end at the cam....

Reply #19 – May 15, 2009, 03:23:41 PM

Spoke to a few people and Ed e-mailed me back. 1/2 turn is right on the money.....

Measured the pushrods with an adjustable one......
Interesting results.....Perhaps I shaged up.
I got a .057" difference. Only thing is its for SMALLER pushrods.....
The base circle on the new cam is .100" smaller -- overall max lift is .055" MORE (with 1.6 rockers) -- does this makes sense?

Cam swap: It doesn't end at the cam....

Reply #20 – May 15, 2009, 03:44:01 PM

Are you using checking springs with the gauge? Just a note to, the pushrods only come in .050 lengths. I triple checked mine and still needed .250 longer. I also set my cam on tdc the cam card had the spec for, after finding true tdc, and was just about exact at 0 to 0, I could of used a little more advance but it would of put it to much out of spec.

Cam swap: It doesn't end at the cam....

Reply #21 – May 15, 2009, 04:15:15 PM

Yeah, that's the difference I got between the old pushrod and the set length with the checker -- .057"

I must have screwed up. I'll check it later....Maybe make a solid checking lifter instead.

Cam swap: It doesn't end at the cam....

Reply #22 – May 15, 2009, 08:07:43 PM

I used a sollid and check springs, didn't matter. it was the same. the check springs will work without the solid, just watch the lifter see if the disc on top moves when your checking it.

Cam swap: It doesn't end at the cam....

Reply #23 – May 16, 2009, 07:28:16 AM

It did. I'm getting a new check spring today. This one was a "hand me down" and feels kinda stiff for it's intended purpose. My lifters have been sitting for 3 weeks now too so it won't take much to collapse the plunger.

All other things being equal I was expecting something around 6.800"....We'll see.

Cam swap: It doesn't end at the cam....

Reply #24 – May 16, 2009, 11:52:39 AM

Isn't there an article on sbftech about turning a hydro roller into a solid roller for checking pushrod lenght?

Cam swap: It doesn't end at the cam....

Reply #25 – May 16, 2009, 07:36:00 PM

Yeah, there's a few ways to do it. I'll try a new spring first. Like I said, I mighta messed up something anyway. Too tired after work today to pick up the spring. JUST woke up. I'll get it tomorrow. Car's inside now.....no rush.

Cam swap: It doesn't end at the cam....

Reply #26 – May 18, 2009, 03:54:29 PM

Measured everything up CORRECTLY today. New pushrod length: [COLOR="Red"]6.750"[/COLOR]

I going with the Comp Hi-tech as opposed to the Trick Flows this time. They come HIGHLY recommended -- although the Trick Flow pieces ARE nice...

Time for a for sale thread

Cam swap: It doesn't end at the cam....

Reply #27 – May 21, 2009, 05:07:49 AM

How much adjuster thread do you have on the rockers? I lost quite a bit with mine.

Cam swap: It doesn't end at the cam....

Reply #28 – May 30, 2009, 06:10:20 PM

I really didn't lose too much, but then again I only went up .050" in net valve lift and pushrod length.

On a better note:

I MADE A TON OF PROGRESS TODAY!!!! NO SLEEP BEFORE WORK FTW!!!!11ELEVEN!!ONE!

Looks like I'll need a new hood:

:hick:

Gotcha!

Here's the real one!!

One thing is stopping me from finishing......I need to run a SECOND spacer....
That's right. With those valve covers in the picture, the one inch phenolic spacer I have is not enough. Here's why :

Take note that the bracket is not bolted to the backside of the throttle body as it should be and the holes are about 1/4" off. The spacer is the easy part along with the 4 stud mounts. Finding the correct length center bolts with a small enough head that pass all the way through the manifold however....

I suppose some of you have also noticed where I've mounted my oil fill cap. Seems odd doesn't it?

Hint:

Cam swap: It doesn't end at the cam....

Reply #29 – June 02, 2009, 06:00:17 AM

what's that sittin on the other side of the garage?